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CALAMOS FOCUS GROWTH FUND (CBCAX)

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Blue Chip Name Change to Focus Growth

Effective March 1, 2013 the Calamos Blue Chip Fund has changed its names to Focus Growth Fund. The fund is becoming more focused, which we believe may provide an opportunity for investors to diversify their equity allocation using a more concentrated strategy. Please click here for a Q&A that discusses the reasons for the name change.

Investment Strategy

The fund invests primarily in equity securities issued by U.S. "Blue Chip" companies that offer the best opportunities for growth. Blue Chip companies generally are well established companies listed in the S&P 500 Index or the Dow Jones Industrial Average index.

  • A focused, growth-oriented strategy
  • Seeks higher growth businesses
  • Invests in primarily U.S.-based, large-cap companies we believe have the best prospects for sustainable growth

Return on Invested Capital

AS OF 3/31/13

Debt/Capital

AS OF 3/31/13

Return on invested capital measures how effectively a company uses the money invested in its operations, calculated as a company’s net income minus any dividends divided by the company’s total capital. Debt/capital ratio is a measure of a company’s financial leverage, calculated as the company’s debt divided by its total capital.

Fund Objective

The fund seeks long-term capital growth.

Fund Benchmarks

  • Russell 1000 Growth Index
  • S&P 500 Index

Investment Process

The fund's investment team employs an investment process that considers global macro economic factors and investment themes. The team conducts both fundamental and quantitative research to evaluate the source, sustainability and risk of investment opportunities. The team manages a diversified portfolio monitoring and managing risk at the portfolio and individual security level.

Investment Team

John P. Calamos, Sr., Global Co-Chief Investment Officer and Gary D. Black, Global Co-Chief Investment Officer lead an integrated team of experienced investment professionals.

Before investing carefully consider the fund's investment objectives, risks, charges and expenses. Please see the prospectus and summary prospectus containing this and other information or call 1-800-582-6959. Read it carefully before investing.

NOT FDIC INSURED | NO BANK GUARANTEE | MAY LOSE VALUE

Calamos Financial Services LLC, Distributor

Important Risk Information

An investment in the Fund(s) is subject to risks, and you could lose money on your investment in the Fund(s). There can be no assurance that the Fund(s) will achieve its investment objective. Your investment in the Fund(s) is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency. The risks associated with an investment in the Fund(s) can increase during times of significant market volatility. The Fund(s) also has specific principal risks, which are described below. More detailed information regarding these risks can be found in the Fund’s prospectus.

The principal risks of investing in the Calamos Focus Growth Fund include: equity securities risk, growth stock risk, value stock risk, foreign securities risk and portfolio selection risk.

As a result of political or economic instability in foreign countries, there can be special risks associated with investing in foreign securities, including fluctuations in currency exchange rates, increased price volatility and difficulty obtaining information. In addition, emerging markets may present additional risk due to potential for greater economic and political instability in less developed countries.

NOTES

Annualized Standard Deviation-A statistical measure of the historical volatility of a mutual fund or portfolio, usually computed using 36 monthly returns. More generally, a measure of the extent to which numbers are spread around their average.

Beta-Is a historic measure of a fund's relative volatility, which is one of the measures of risk; a beta of 0.5 reflects 1/2 the market's volatility as represented by the S&P 500 Index, while a beta of 2.0 reflects twice the market's volatility.

Current (SEC) Yield-Reflects the dividends and interest earned by the Fund during the 30-day period ended as of the date stated above after deducting the Fund's expenses for that same period.

Debt/Capital Ratio-Is a measure of a company s financial leverage, calculated as the company’s debt divided by its total capital.

PEG Ratio-Is price/earnings ratio divided by estimated earnings growth rate in the next year; a lower PEG indicates that less is being paid for each unit of earnings growth.

Price/Book Ratio-Is a stock’s capitalization divided by its book value.

Price/Earnings Ratio-Is the current stock price over trailing 12‐month earnings per share.

Price/Sales Ratio-Is the current stock price over trailing 12‐month sales per share.

ROIC (Return On Invested Capital)-Measures how effectively a company uses the money invested in its operations, calculated as a company’s net income minus any dividends divided by the company’s total capital.

S&P 500 Index-Is generally considered representative of the U.S. stock market.

Russell 1000® Value Index-Measures the performance of those companies in the Russell 1000® Index with lower price-to-book ratios and lower forecasted growth values.



Turnover-is the percentage of assets in a portfolio that changed over a certain period, often a year; higher turnover indicates greater buying and selling activity.

Unmanaged index returns assume reinvestment of any and all distributions and, unlike fund returns, do not reflect fees, expenses or sales charges. Investors cannot invest directly in an index.

The Fund’s investment adviser has contractually agreed to reimburse Fund expenses through June 30, 2013 to the extent necessary so that Total Annual Fund Operating Expenses (excluding taxes, interest, short interest, short dividend expenses, brokerage commissions, acquired fund fees and expenses and extraordinary expenses, if any) of Class A, Class B, Class C, Class I and Class R are limited to:

1.15%, 1.90%, 1.90%, 0.90% and 1.40% of average net assets respectively for the Calamos Focus Growth Fund.

† Morningstar Ratings are based on risk-adjusted returns. The Overall Morningstar Rating is derived from a weighted average of the performance figures associated with a fund’s 3-, 5-, and 10-year Morningstar Rating metrics.

For each U.S.-domiciled fund with at least a three-year history, Morningstar calculates a Morningstar Rating based on a Morningstar Risk-Adjusted Return measure that accounts for variation in a fund’s monthly performance (including the effects of sales charges, loads and redemption fees), placing more emphasis on downward variations and rewarding consistent performance. The top 10% of funds in each category receive 5 stars, the next 22.5% receive 4 stars, the next 35% receive 3 stars, the next 22.5% receive 2 stars and the bottom 10% receive 1 star. (Each share class is counted as a fraction of one fund within this scale and rated separately, which may cause slight variations in the distribution percentages.) Morningstar data: © 2012 Morningstar, Inc. All rights reserved. The information contained herein is proprietary to Morningstar and/or its content providers; may not be copied or distributed; and is not warranted to be accurate, complete or timely. Neither Morningstar nor its content providers are responsible for any damages or losses arising from any use of this information.

Unmanaged index returns assume reinvestment of any and all distributions and, unlike fund returns, do not reflect fees, expenses or sales charges. Investors cannot invest directly in an index.

Performance data quoted represents past performance, which is no guarantee of future results. Current performance may be lower or higher than the performance quoted. The principal value and investment return of an investment will fluctuate so that your shares, when redeemed, may be worth more or less than their original cost.

Average annual total return measures net investment income and capital gain or loss from portfolio investments as an annualized average. All performance shown assumes reinvestment of dividends and capital gains distributions. Class A shares load-adjusted returns are adjusted for the maximum front-end sales load of 4.75%. The Funds also offer Class B and C shares, the performance of which may vary. Performance shown reflects an expense reimbursement that improved results.

The Fund's gross expense ratio is 1.57% as of the prospectus dated 2/29/2012.

Unmanaged index returns assume reinvestment of any and all distributions and, unlike fund returns, do not reflect fees, expenses or sales charges. Investors cannot invest directly in an index.

Calendar Year Total Returns

AS OF 3/31/13

Annualized Total Returns

AS OF 3/31/13

1Top 10 Holdings and Sector Weightings are calculated as a percentage of Net Assets. The tables exclude cash or cash equivalents, any government / sovereign bonds or broad based index hedging securities the portfolio may hold. You can obtain a complete listing of holdings by visiting www.calamos.com.

The portfolio is actively managed. Holdings and weightings are subject to change daily. Holdings are provided for informational purposes only and should not be deemed as a recommendation to buy or sell the securities mentioned.

Before investing carefully consider the fund's investment objectives, risks, charges and expenses. Please see the prospectus and summary prospectus containing this and other information or call 1-800-582-6959. Read it carefully before investing.

NOT FDIC INSURED | NO BANK GUARANTEE | MAY LOSE VALUE

Calamos Financial Services LLC, Distributor

10k Performance is for the Fund’s Class A shares at net asset value and does not include the Fund’s maximum front-end sales charge of 4.75%—had it been included, the Fund’s return would have been lower. Index data shown is from 11/30/03, since comparative index data is available only for full monthly periods. Source: State Street Corporation and Lipper, Inc.

Performance data quoted represents past performance, which is no guarantee of future results. Current performance may be lower or higher than the performance quoted. The principal value and return of an investment will fluctuate so that your shares, when redeemed, may be worth more or less than their original cost. Performance reflected at NAV does not include the Fund’s maximum front-end sales load of 4.75%—had it been included, the Fund’s return would have been lower. Calendar year returns measure net investment income and capital gain or loss from portfolio investments for each period specified. Average annual total return measures net investment income and capital gain or loss from portfolio investments as an annualized average. All performance shown assumes reinvestment of dividends and capital gains distributions. The Fund also offers Class B and C Shares, the performance of which may vary. As of the prospectus dated 2/29/12, the Fund’s gross expense ratios for Class A shares is 1.57%; Class B and C shares is 2.32% ; Class I shares is 1.32%.

The offering price for Class I shares is the NAV per share with no initial sales charge. There are no contingent deferred sales charges or distribution or service fees with respect to Class I shares. The minimum initial investment required to purchase each Fund’s Class I shares is $1 million. Class I shares are offered primarily for direct investment by investors through certain tax-exempt retirement plans (including 401(k) plans, 457 plans, employer-sponsored 403(b) plans, profit sharing and money purchase pension plans, defined benefit plans and non qualified deferred compensation plans) and by institutional clients, provided such plans or clients have assets of at least $1 million. Class I shares may also be offered to certain other entities or programs, including, but not limited to, investment companies, under certain circumstances.

S&P 500 Index-Is generally considered representative of the U.S. stock market.

Russell 1000® Value Index-Measures the performance of those companies in the Russell 1000® Index with lower price-to-book ratios and lower forecasted growth values.

The Fund’s investment adviser has contractually agreed to reimburse Fund expenses through June 30, 2013 to the extent necessary so that Total Annual Fund Operating Expenses (excluding taxes, interest, short interest, short dividend expenses, brokerage commissions, acquired fund fees and expenses and extraordinary expenses, if any) of Class A, Class B, Class C, Class I and Class R are limited to:

1.15%, 1.90%, 1.90%, 0.90% and 1.40% of average net assets respectively for the Calamos Focus Growth Fund.

† Morningstar Ratings are based on risk-adjusted returns. The Overall Morningstar Rating is derived from a weighted average of the performance figures associated with a fund’s 3-, 5-, and 10-year Morningstar Rating metrics.

For each U.S.-domiciled fund with at least a three-year history, Morningstar calculates a Morningstar Rating based on a Morningstar Risk-Adjusted Return measure that accounts for variation in a fund’s monthly performance (including the effects of sales charges, loads and redemption fees), placing more emphasis on downward variations and rewarding consistent performance. The top 10% of funds in each category receive 5 stars, the next 22.5% receive 4 stars, the next 35% receive 3 stars, the next 22.5% receive 2 stars and the bottom 10% receive 1 star. (Each share class is counted as a fraction of one fund within this scale and rated separately, which may cause slight variations in the distribution percentages.) Morningstar data: © 2012 Morningstar, Inc. All rights reserved. The information contained herein is proprietary to Morningstar and/or its content providers; may not be copied or distributed; and is not warranted to be accurate, complete or timely. Neither Morningstar nor its content providers are responsible for any damages or losses arising from any use of this information.

Unmanaged index returns assume reinvestment of any and all distributions and, unlike fund returns, do not reflect fees, expenses or sales charges. Investors cannot invest directly in an index.

Performance data quoted represents past performance, which is no guarantee of future results. Current performance may be lower or higher than the performance quoted. The principal value and investment return of an investment will fluctuate so that your shares, when redeemed, may be worth more or less than their original cost.

Average annual total return measures net investment income and capital gain or loss from portfolio investments as an annualized average. All performance shown assumes reinvestment of dividends and capital gains distributions. Class A shares load-adjusted returns are adjusted for the maximum front-end sales load of 4.75%. The Funds also offer Class B and C shares, the performance of which may vary. Performance shown reflects an expense reimbursement that improved results.

The Fund's gross expense ratio is 1.57% as of the prospectus dated 2/29/2012.

Unmanaged index returns assume reinvestment of any and all distributions and, unlike fund returns, do not reflect fees, expenses or sales charges. Investors cannot invest directly in an index.

Sector Weightings

AS OF 3/31/13
% of Assets Russell 1000 Growth Index
Information Technology 39.8% 29.0%
Consumer Discretionary 15.7% 16.9%
Health Care 13.4% 12.8%
Industrials 11.4% 12.9%
Energy 6.9% 4.2%
Consumer Staples 6.4% 12.9%
Financials 4.8% 4.9%
Materials 0.0% 3.9%
Telecommunication Services 0.0% 2.3%
Utilities 0.0% 0.2%
Index Options 0.0% 0.0%
Sovereign Bonds 0.0% 0.0%
Other 0.0% 0.0%

Asset Allocation

AS OF 3/31/13

Top 10 Holdings

Adobe Logo View All Holdings AS OF 3/31/13
Company Security Type Industry
%
MasterCard, Inc. - Class A Common Stock Data Processing & Outsourced Services 4.9%
Google, Inc. Common Stock Internet Software & Services 4.9%
Amazon.com, Inc. Common Stock Internet Retail 4.8%
Novo Nordisk, A/S Common Stock Pharmaceuticals 4.6%
QUALCOMM, Inc. Common Stock Communications Equipment 4.3%
SAP, AG Common Stock Application Software 4.1%
Apple, Inc. Common Stock Computer Hardware 3.8%
eBay, Inc. Common Stock Internet Software & Services 3.7%
Gilead Sciences, Inc. Common Stock Biotechnology 3.7%
Starbucks Corp. Common Stock Restaurants 3.7%
Total 42.5%

Fund Facts

AS OF 3/31/13


Fund Russell 1000 Growth Index
Total Net Assets $59.3 million --
# of Holdings 38 574
Turnover 68.2% --
Price/Book 4.4x 4.3x
Price/Earnings 20.5x 17.4x
Price/Sales 2.7x 1.9x
PEG Ratio 1.5x 1.5x
Debt/Capital 15.6% 37.0%
ROIC 27.2% 20.9%
Portfolio Turnover (12 months) 68.2% --

Market Capitalization

AS OF 3/31/13
> $63bil 51.6%
$18bil - $63bil 35.1%
$6bil - $18bil 8.7%
$2bil - $6bil 4.6%
< $2bil 0.0%

Regional Exposure

AS OF 3/31/13
North America 81.0%
Europe 8.7%
Asia/Pacific 6.0%
Latin America 2.8%
Caribbean 0.0%
Middle East/Africa 0.0%

Country Exposure

AS OF 3/31/13
United States 81.0%
Denmark 4.6%
Germany 4.1%
Brazil 2.8%
South Korea 2.4%
Hong Kong 1.9%
Taiwan 1.7%
Ireland 0.0%
Switzerland 0.0%
United Kingdom 0.0%

Currency Exposure

AS OF 3/31/13
United States Dollar (USD) 95.9%
South Korean WON (KRW) 2.4%
Taiwan Dollar (TWD) 1.7%

1Top 10 Holdings and Sector Weightings are calculated as a percentage of Net Assets. The tables exclude cash or cash equivalents, any government / sovereign bonds or broad based index hedging securities the portfolio may hold. You can obtain a complete listing of holdings by visiting www.calamos.com.

Holdings and weightings are subject to change daily. Holdings are provided for informational purposes only and should not be deemed as a recommendation to buy or sell the securities mentioned.

Before investing carefully consider the fund's investment objectives, risks, charges and expenses. Please see the prospectus and summary prospectus containing this and other information or call 1-800-582-6959. Read it carefully before investing.

NOT FDIC INSURED | NO BANK GUARANTEE | MAY LOSE VALUE

Calamos Financial Services LLC, Distributor

Important Fund Information.
Annualized Standard Deviation—A statistical measure of the historical volatility of a mutual fund or portfolio.

Beta—Is a historic measure of a fund’s relative volatility, which is one of the measures of risk; a beta of 0.5 reflects 1/2 the market’s volatility as represented by the Fund’s primary benchmark, while a beta of 2.0 reflects twice the volatility.

Lipper Large Cap Growth Funds—Invest by practice at least 75% of their equity assets in companies with market capitalizations (on a three-year weighted basis) above Lipper’s USDE large-cap floor. Large-cap growth funds typically have an above-average price-to-earnings ratio, price-to-book ratio, and three-year sales-per-share growth value, compared to the S&P 500 Index. The Russell 1000 Growth Index measures the performance of the large-cap growth segment of the U.S. equity universe. It includes those Russell 1000 companies with higher price-to-book ratios and higher forecasted growth values.

S&P 500 Index—Is generally considered representative of the U.S. stock market. Unmanaged index returns assume reinvestment of any and all distributions and, unlike fund returns, do not reflect fees, expenses or sales charges. Investors cannot invest directly in an index.

Portfolios are managed according to their respective strategies which may differ significantly in terms of security holdings, industry weightings, and asset allocation from those of the benchmark(s). Portfolio performance, characteristics and volatility may differ from the benchmark(s) shown.

Important Risk Information.
An investment in the Fund(s) is subject to risks, and you could lose money on your investment in the Fund(s). There can be no assurance that the Fund(s) will achieve its investment objective. Your investment in the Fund(s) is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency. The risks associated with an investment in the Fund(s) can increase during times of significant market volatility. The Fund(s) also has specific principal risks, which are described below. More detailed information regarding these risks can be found in the Fund’s prospectus.

The principal risks of investing in the Calamos Focus Growth Fund include: equity securities risk, growth stock risk, value stock risk, foreign securities risk and portfolio selection risk. As a result of political or economic instability in foreign countries, there can be special risks associated with investing in foreign securities, including fluctuations in currency exchange rates, increased price volatility and difficulty obtaining information. In addition, emerging markets may present additional risk due to potential for greater economic and political instability in less developed countries. Before investing, carefully consider the Fund’s investment objectives, risks, charges and expenses. Contact 800.582.6959 for a prospectus containing this and other information. Read it carefully. Portfolios are managed according to their respective strategies which may differ significantly in terms of security holdings, industry weightings, and asset allocation from those of the benchmark(s). Portfolio performance, characteristics and volatility may differ from the benchmark(s) shown.

S&P 500 Index-Is generally considered representative of the U.S. stock market.

Russell 1000® Value Index-Measures the performance of those companies in the Russell 1000® Index with lower price-to-book ratios and lower forecasted growth values.

The Fund’s investment adviser has contractually agreed to reimburse Fund expenses through June 30, 2013 to the extent necessary so that Total Annual Fund Operating Expenses (excluding taxes, interest, short interest, short dividend expenses, brokerage commissions, acquired fund fees and expenses and extraordinary expenses, if any) of Class A, Class B, Class C, Class I and Class R are limited to:

1.15%, 1.90%, 1.90%, 0.90% and 1.40% of average net assets respectively for the Calamos Focus Growth Fund.

† Morningstar Ratings are based on risk-adjusted returns. The Overall Morningstar Rating is derived from a weighted average of the performance figures associated with a fund’s 3-, 5-, and 10-year Morningstar Rating metrics.

For each U.S.-domiciled fund with at least a three-year history, Morningstar calculates a Morningstar Rating based on a Morningstar Risk-Adjusted Return measure that accounts for variation in a fund’s monthly performance (including the effects of sales charges, loads and redemption fees), placing more emphasis on downward variations and rewarding consistent performance. The top 10% of funds in each category receive 5 stars, the next 22.5% receive 4 stars, the next 35% receive 3 stars, the next 22.5% receive 2 stars and the bottom 10% receive 1 star. (Each share class is counted as a fraction of one fund within this scale and rated separately, which may cause slight variations in the distribution percentages.) Morningstar data: © 2012 Morningstar, Inc. All rights reserved. The information contained herein is proprietary to Morningstar and/or its content providers; may not be copied or distributed; and is not warranted to be accurate, complete or timely. Neither Morningstar nor its content providers are responsible for any damages or losses arising from any use of this information.

Unmanaged index returns assume reinvestment of any and all distributions and, unlike fund returns, do not reflect fees, expenses or sales charges. Investors cannot invest directly in an index.

Performance data quoted represents past performance, which is no guarantee of future results. Current performance may be lower or higher than the performance quoted. The principal value and investment return of an investment will fluctuate so that your shares, when redeemed, may be worth more or less than their original cost.

Average annual total return measures net investment income and capital gain or loss from portfolio investments as an annualized average. All performance shown assumes reinvestment of dividends and capital gains distributions. Class A shares load-adjusted returns are adjusted for the maximum front-end sales load of 4.75%. The Funds also offer Class B and C shares, the performance of which may vary. Performance shown reflects an expense reimbursement that improved results.

The Fund's gross expense ratio is 1.57% as of the prospectus dated 2/29/2012.

Unmanaged index returns assume reinvestment of any and all distributions and, unlike fund returns, do not reflect fees, expenses or sales charges. Investors cannot invest directly in an index.

Total Capital Gains

  
20110.0000
20100.0000
20090.0000
20080.0000

Schedule

   
Distributions Annually
Capital Gains Annually

Distributions

Choose a year  
Income Total Reinvest
1Q 2013 0.00000 0.00000 0.00000
4Q 2012 0.06286 0.06286 13.50000
3Q 2012 0.00000 0.00000 0.00000
2Q 2012 0.00000 0.00000 0.00000
1Q 2012 0.00000 0.00000 0.00000
4Q 2011 0.00000 0.00000 0.00000
3Q 2011 0.00000 0.00000 0.00000
2Q 2011 0.00000 0.00000 0.00000
1Q 2011 0.00000 0.00000 0.00000
4Q 2010 0.00000 0.00000 0.00000
3Q 2010 0.00000 0.00000 0.00000
2Q 2010 0.00000 0.00000 0.00000
1Q 2010 0.00000 0.00000 0.00000
4Q 2009 0.01974 0.01974 10.85000
3Q 2009 0.00000 0.00000 0.00000
2Q 2009 0.00000 0.00000 0.00000
1Q 2009 0.00000 0.00000 0.00000
4Q 2008 0.03781 0.03781 8.20000
3Q 2008 0.00000 0.00000 0.00000
2Q 2008 0.00000 0.00000 0.00000
1Q 2008 0.00000 0.00000 0.00000
Adobe Logo Fourth Quarter and Annual Income Distributions

For more information about the Funds such as sector weightings, top holdings, credit ratings and distribution rates, please contact Client Services at 800-582-6959.

Each Fund is a series of Calamos Investment Trust. The investment adviser to the Funds is Calamos Advisors LLC. The Calamos Family of Funds offers a range of investment strategies for individual investors with diverse investment objectives and needs. For more information on the Funds, please call 800-582-6959.

Before investing carefully consider the fund's investment objectives, risks, charges and expenses. Please see the prospectus and summary prospectus containing this and other information or call 1-800-582-6959. Read it carefully before investing.

NOT FDIC INSURED | NO BANK GUARANTEE | MAY LOSE VALUE

Calamos Financial Services LLC, Distributor

The Fund’s investment adviser has contractually agreed to reimburse Fund expenses through June 30, 2013 to the extent necessary so that Total Annual Fund Operating Expenses (excluding taxes, interest, short interest, short dividend expenses, brokerage commissions, acquired fund fees and expenses and extraordinary expenses, if any) of Class A, Class B, Class C, Class I and Class R are limited to:

1.15%, 1.90%, 1.90%, 0.90% and 1.40% of average net assets respectively for the Calamos Focus Growth Fund.

† Morningstar Ratings are based on risk-adjusted returns. The Overall Morningstar Rating is derived from a weighted average of the performance figures associated with a fund’s 3-, 5-, and 10-year Morningstar Rating metrics.

For each U.S.-domiciled fund with at least a three-year history, Morningstar calculates a Morningstar Rating based on a Morningstar Risk-Adjusted Return measure that accounts for variation in a fund’s monthly performance (including the effects of sales charges, loads and redemption fees), placing more emphasis on downward variations and rewarding consistent performance. The top 10% of funds in each category receive 5 stars, the next 22.5% receive 4 stars, the next 35% receive 3 stars, the next 22.5% receive 2 stars and the bottom 10% receive 1 star. (Each share class is counted as a fraction of one fund within this scale and rated separately, which may cause slight variations in the distribution percentages.) Morningstar data: © 2012 Morningstar, Inc. All rights reserved. The information contained herein is proprietary to Morningstar and/or its content providers; may not be copied or distributed; and is not warranted to be accurate, complete or timely. Neither Morningstar nor its content providers are responsible for any damages or losses arising from any use of this information.

Unmanaged index returns assume reinvestment of any and all distributions and, unlike fund returns, do not reflect fees, expenses or sales charges. Investors cannot invest directly in an index.

Performance data quoted represents past performance, which is no guarantee of future results. Current performance may be lower or higher than the performance quoted. The principal value and investment return of an investment will fluctuate so that your shares, when redeemed, may be worth more or less than their original cost.

Average annual total return measures net investment income and capital gain or loss from portfolio investments as an annualized average. All performance shown assumes reinvestment of dividends and capital gains distributions. Class A shares load-adjusted returns are adjusted for the maximum front-end sales load of 4.75%. The Funds also offer Class B and C shares, the performance of which may vary. Performance shown reflects an expense reimbursement that improved results.

The Fund's gross expense ratio is 1.57% as of the prospectus dated 2/29/2012.

Unmanaged index returns assume reinvestment of any and all distributions and, unlike fund returns, do not reflect fees, expenses or sales charges. Investors cannot invest directly in an index.

Annual Expenses

A Shares B Shares C Shares I Shares
Total Expense Ratio1.582.332.331.33
Net Expense Ratio1.161.911.910.91
Transaction Fee0.000.000.000.00
Redemption Fee0.000.000.000.00

Investment Information

A Shares B Shares C Shares I Shares
Minimum initial investment$2,500$2,500$2,500$1 million
Minimum subsequent investments$50$50$50$0
IRA initial investments$500$500$500N/A

Fund Information

A Shares B Shares C Shares I Shares
Inception Date12/01/0312/01/0312/01/0312/01/03
Ticker SymbolCBCAXCBCBXCBXCXCBCIX
CUSIP number128119625128119617128119591128119583

Sales & Distribution

A Shares B Shares C Shares I Shares
Sales loadFront-endBack-endLevel-loadN/A
Maximum Sales Charge4.75%5.00%1.00%N/A
US Bank Fund Number641642643644
DistributionsAnnual dividends; annual capital gains

For more information about the Funds such as sector weightings, top holdings, credit ratings and distribution rates, please contact Client Services at 800-582-6959.

Each Fund is a series of Calamos Investment Trust. The investment adviser to the Funds is Calamos Advisors LLC. The Calamos Family of Funds offers a range of investment strategies for individual investors with diverse investment objectives and needs. For more information on the Funds, please call 800-582-6959.

Before investing carefully consider the fund's investment objectives, risks, charges and expenses. Please see the prospectus and summary prospectus containing this and other information or call 1-800-582-6959. Read it carefully before investing.

NOT FDIC INSURED | NO BANK GUARANTEE | MAY LOSE VALUE

Calamos Financial Services LLC, Distributor

The Fund’s investment adviser has contractually agreed to reimburse Fund expenses through June 30, 2013 to the extent necessary so that Total Annual Fund Operating Expenses (excluding taxes, interest, short interest, short dividend expenses, brokerage commissions, acquired fund fees and expenses and extraordinary expenses, if any) of Class A, Class B, Class C, Class I and Class R are limited to:

1.15%, 1.90%, 1.90%, 0.90% and 1.40% of average net assets respectively for the Calamos Focus Growth Fund.

† Morningstar Ratings are based on risk-adjusted returns. The Overall Morningstar Rating is derived from a weighted average of the performance figures associated with a fund’s 3-, 5-, and 10-year Morningstar Rating metrics.

For each U.S.-domiciled fund with at least a three-year history, Morningstar calculates a Morningstar Rating based on a Morningstar Risk-Adjusted Return measure that accounts for variation in a fund’s monthly performance (including the effects of sales charges, loads and redemption fees), placing more emphasis on downward variations and rewarding consistent performance. The top 10% of funds in each category receive 5 stars, the next 22.5% receive 4 stars, the next 35% receive 3 stars, the next 22.5% receive 2 stars and the bottom 10% receive 1 star. (Each share class is counted as a fraction of one fund within this scale and rated separately, which may cause slight variations in the distribution percentages.) Morningstar data: © 2012 Morningstar, Inc. All rights reserved. The information contained herein is proprietary to Morningstar and/or its content providers; may not be copied or distributed; and is not warranted to be accurate, complete or timely. Neither Morningstar nor its content providers are responsible for any damages or losses arising from any use of this information.

Unmanaged index returns assume reinvestment of any and all distributions and, unlike fund returns, do not reflect fees, expenses or sales charges. Investors cannot invest directly in an index.

Performance data quoted represents past performance, which is no guarantee of future results. Current performance may be lower or higher than the performance quoted. The principal value and investment return of an investment will fluctuate so that your shares, when redeemed, may be worth more or less than their original cost.

Average annual total return measures net investment income and capital gain or loss from portfolio investments as an annualized average. All performance shown assumes reinvestment of dividends and capital gains distributions. Class A shares load-adjusted returns are adjusted for the maximum front-end sales load of 4.75%. The Funds also offer Class B and C shares, the performance of which may vary. Performance shown reflects an expense reimbursement that improved results.

The Fund's gross expense ratio is 1.57% as of the prospectus dated 2/29/2012.

Unmanaged index returns assume reinvestment of any and all distributions and, unlike fund returns, do not reflect fees, expenses or sales charges. Investors cannot invest directly in an index.

Literature

Focus Growth Fund Quarterly Commentary A quarterly update of the Calamos Focus Growth Fund’s performance, positioning, related market commentary and outlook.
Calamos Focus Growth Fund Fact Sheet The Focus Growth Fund fact sheet provides a snap shot of the investment team, the fund strategy, performance, composition, ratings and returns.
Summary Prospectus (Class A, B, C) This summary contains important information about the Class A, B and C Focus Growth Fund investment objective, fees and expenses, principal investment strategies, principal risks and performance.
Summary Prospectus (Class I, R) This summary contains important information about the Class I and R Focus Growth Fund investment objective, fees and expenses, principal investment strategies, principal risks and performance.
Statutory Prospectus (Class A, B, C) This prospectus supplement, together with the accompanying prospectus, sets forth concisely the information that you should know before investing. You should read the accompanying prospectus and prospectus supplement, which contain important information, before deciding whether to invest in our securities.
Statutory Prospectus (Class I, R) This prospectus supplement, together with the accompanying prospectus, sets forth concisely the information that you should know before investing. You should read the accompanying prospectus and prospectus supplement, which contain important information, before deciding whether to invest in our securities.
SAI The statement of additional information is a supplementary document to the fund’s prospectus and contains additional information about the fund and includes further disclosure regarding its operations.
Semiannual Report The semiannual report includes a letter from John P. Calamos, Sr. to shareholders and provides a comprehensive review of the fund’s activities and financial performance over a six month period.
Annual Report The annual report includes a letter from John P. Calamos, Sr. to shareholders outlining the fund's performance, as well as a comprehensive review of the fund’s activities and financial performance.

Before investing carefully consider the fund's investment objectives, risks, charges and expenses. Please see the prospectus and summary prospectus containing this and other information or call 1-800-582-6959. Read it carefully before investing.

NOT FDIC INSURED | NO BANK GUARANTEE | MAY LOSE VALUE

Calamos Financial Services LLC, Distributor

The Fund’s investment adviser has contractually agreed to reimburse Fund expenses through June 30, 2013 to the extent necessary so that Total Annual Fund Operating Expenses (excluding taxes, interest, short interest, short dividend expenses, brokerage commissions, acquired fund fees and expenses and extraordinary expenses, if any) of Class A, Class B, Class C, Class I and Class R are limited to:

1.15%, 1.90%, 1.90%, 0.90% and 1.40% of average net assets respectively for the Calamos Focus Growth Fund.

† Morningstar Ratings are based on risk-adjusted returns. The Overall Morningstar Rating is derived from a weighted average of the performance figures associated with a fund’s 3-, 5-, and 10-year Morningstar Rating metrics.

For each U.S.-domiciled fund with at least a three-year history, Morningstar calculates a Morningstar Rating based on a Morningstar Risk-Adjusted Return measure that accounts for variation in a fund’s monthly performance (including the effects of sales charges, loads and redemption fees), placing more emphasis on downward variations and rewarding consistent performance. The top 10% of funds in each category receive 5 stars, the next 22.5% receive 4 stars, the next 35% receive 3 stars, the next 22.5% receive 2 stars and the bottom 10% receive 1 star. (Each share class is counted as a fraction of one fund within this scale and rated separately, which may cause slight variations in the distribution percentages.) Morningstar data: © 2012 Morningstar, Inc. All rights reserved. The information contained herein is proprietary to Morningstar and/or its content providers; may not be copied or distributed; and is not warranted to be accurate, complete or timely. Neither Morningstar nor its content providers are responsible for any damages or losses arising from any use of this information.

Unmanaged index returns assume reinvestment of any and all distributions and, unlike fund returns, do not reflect fees, expenses or sales charges. Investors cannot invest directly in an index.

Performance data quoted represents past performance, which is no guarantee of future results. Current performance may be lower or higher than the performance quoted. The principal value and investment return of an investment will fluctuate so that your shares, when redeemed, may be worth more or less than their original cost.

Average annual total return measures net investment income and capital gain or loss from portfolio investments as an annualized average. All performance shown assumes reinvestment of dividends and capital gains distributions. Class A shares load-adjusted returns are adjusted for the maximum front-end sales load of 4.75%. The Funds also offer Class B and C shares, the performance of which may vary. Performance shown reflects an expense reimbursement that improved results.

The Fund's gross expense ratio is 1.57% as of the prospectus dated 2/29/2012.

Unmanaged index returns assume reinvestment of any and all distributions and, unlike fund returns, do not reflect fees, expenses or sales charges. Investors cannot invest directly in an index.

Fund Details

As of 5/21/13
Inception Date:
12/1/03
Current NAV:
$14.66
$ Change:
($0.03)
% Change:
-0.20%
Net Assets*
59.3 mil
(*Total Net Assets as of 3/31/13)

Resources

Morningstar rated the Focus Growth A Fund among 1482 and 1278 Large Growth funds for the overall rating and the 3-, and 5-year periods (as applicable) ending 3/31/13, respectively. Morningstar Ratings™ are based on risk-adjusted returns. The Overall Morningstar Rating™ is derived from a weighted average of the performance figures associated with a fund's 3-, 5-, and 10-year (if applicable) Morningstar Rating™ metrics.
Overall
3 Year
5 Year
10 Year
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Calamos’ Morningstar style box is based on the portfolio’s overall targeted capitalization range and relative valuation as determined by Calamos Investments.

Morningstar rated the Focus Growth A Fund among 1482 and 1278 Large Growth funds for the overall rating and the 3-, and 5-year periods (as applicable) ending 3/31/13, respectively. Morningstar Ratings™ are based on risk-adjusted returns. The Overall Morningstar Rating™ is derived from a weighted average of the performance figures associated with a fund's 3-, 5-, and 10-year (if applicable) Morningstar Rating™ metrics.