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CALAMOS GROWTH FUND (CVGRX)

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Investment Strategy

The fund invests primarily in equity securities issued by small, midsize and large U.S. companies that we believe offer the best opportunities for growth.

  • Active management blending global investment themes and fundamental research
  • Seeks quality companies with sustainable growth
  • Flexibility to pursue best risk/reward opportunities across capitalization and sector

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 3000 Growth Index
  • S&P 500 Index
  • Russell Mid Cap Growth 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 Fund 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 Growth Fund include: equity securities risk, growth stock risk, mid-sized company 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.

Russell Midcap® Growth Index-Measures the performance of those Russell Midcap companies whose average market capitalization is approximately $4.2 billion, with higher price-to-book ratios and higher growth values.

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

Russell 3000 Growth Index-measures the performance of those Russell 3000 Index companies with higher price-to-book ratios and higher forecasted growth values. The stocks in this index are also members of either the Russell 1000 Growth or the Russell 2000 Growth indexes.

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.

† 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: © 2013 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 1.29% as of the prospectus dated 3/1/2013.

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

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 8/31/90, since comparative index data is available only for full monthly periods. Source: State Street Corporation, Lipper, Inc. and Mellon Analytical Solutions, LLC.

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 1.26%; Class B and C shares is 2.01%; Class I shares is 1.02%, respectively.

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.

Russell Midcap® Growth Index-Measures the performance of those Russell Midcap companies whose average market capitalization is approximately $4.2 billion, with higher price-to-book ratios and higher growth values.

Russell 3000 Growth Index-Measures the performance of the broad growth segment of the U.S. equity universe. It includes those Russell 3000 Index 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.

† 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: © 2013 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 1.29% as of the prospectus dated 3/1/2013.

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 3000 Growth Index
Information Technology 36.0% 28.3%
Consumer Discretionary 17.3% 16.8%
Health Care 13.9% 13.4%
Industrials 12.7% 13.4%
Energy 7.0% 4.3%
Consumer Staples 6.2% 12.3%
Financials 4.7% 5.1%
Materials 0.9% 4.0%
Telecommunication Services 0.0% 2.2%
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
%
Google, Inc. Common Stock Internet Software & Services 4.2%
QUALCOMM, Inc. Common Stock Communications Equipment 3.8%
Amazon.com, Inc. Common Stock Internet Retail 3.8%
Apple, Inc. Common Stock Computer Hardware 3.8%
Gilead Sciences, Inc. Common Stock Biotechnology 3.4%
MasterCard, Inc. - Class A Common Stock Data Processing & Outsourced Services 3.4%
SAP, AG Common Stock Application Software 2.5%
Cognizant Technology Solutions Corp. - Class A Common Stock IT Consulting & Other Services 2.4%
Starbucks Corp. Common Stock Restaurants 2.3%
Salesforce.com, Inc. Common Stock Application Software 2.2%
Total 31.8%

Fund Facts

AS OF 3/31/13


Fund Russell 3000 Growth Index
Total Net Assets $5.2 billion --
# of Holdings 87 1673
Turnover 62.4% --
Price/Book 4.4x 4.2x
Price/Earnings 20.9x 17.6x
Price/Sales 2.6x 1.8x
PEG Ratio 1.5x 1.5x
Debt/Capital 18.7% 36.6%
ROIC 26.4% 20.4%
Portfolio Turnover (12 months) 62.4% --

Market Capitalization

AS OF 3/31/13
> $63bil 39.2%
$18bil - $63bil 30.4%
$6bil - $18bil 22.3%
$2bil - $6bil 7.3%
< $2bil 0.8%

Regional Exposure

AS OF 3/31/13
North America 80.3%
Europe 12.4%
Asia/Pacific 3.5%
Latin America 2.2%
Caribbean 0.2%
Middle East/Africa 0.0%

Country Exposure

AS OF 3/31/13
United States 79.8%
Denmark 2.8%
Ireland 2.8%
Germany 2.5%
Switzerland 2.3%
Brazil 2.2%
Hong Kong 1.9%
South Korea 1.1%
Belgium 0.8%
United Kingdom 0.7%

Currency Exposure

AS OF 3/31/13
United States Dollar (USD) 94.7%
Swiss Franc (CHF) 2.3%
South Korean WON (KRW) 1.2%
Danish Krone (DKK) 1.1%
British Pound Sterling (GBP) 0.7%

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.

PEG ratio– represents a stock’s 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 the 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 a stock’s capitalization divided by its sales over the trailing 12 months. EPS growth (5 years) represents the historical weighted earnings per share growth of holdings. Russell Midcap Growth Index—Measures the performance of the midcap growth segment of the U.S. equity universe and includes companies with higher price-to-book ratios and higher forecasted growth values.

Russell Midcap® Growth Index-Measures the performance of those Russell Midcap companies whose average market capitalization is approximately $4.2 billion, with higher price-to-book ratios and higher growth values.

Russell 3000 Growth Index-Measures the performance of the broad growth segment of the U.S. equity universe. It includes those Russell 3000 Index 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. The Russell 3000 Growth Index measures the performance of those Russell 3000 Index companies with higher price-to-book ratios and higher forecasted growth values. The stocks in this index are also members of either the Russell 1000 Growth or the Russell 2000 Growth indexes. 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 Growth Fund include: equity securities risk, growth stock risk, mid-sized company 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.

† 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: © 2013 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 1.29% as of the prospectus dated 3/1/2013.

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

  
20112.1501
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 0.00000 0.00000 47.65000
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 46.40000
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 0.00000 0.00000 0.00000
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 0.00000 0.00000 0.00000
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

† 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: © 2013 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 1.29% as of the prospectus dated 3/1/2013.

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 Ratio1.292.042.041.04
Net Expense Ratio1.292.042.041.04
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 Date9/04/909/11/009/03/969/18/97
Ticker SymbolCVGRXCVGBXCVGCXCGRIX
CUSIP number128119302128119740128119856128119807

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 Number606613620630
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

† 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: © 2013 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 1.29% as of the prospectus dated 3/1/2013.

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

Growth Fund Quarterly Commentary A quarterly update of the Calamos Growth Fund’s performance, positioning, related market commentary and outlook.
Calamos Growth Fund Fact Sheet The Growth Fund fact sheet provides a snap shot of the investment team, the fund strategy, performance, composition, ratings and returns.
Fund Brochure Global themes are providing an exciting backdrop for many U.S. companies. In this brochure, we consider some of these long-term trends, and explain why we believe U.S. growth stocks are particularly compelling in the current environment.
Summary Prospectus (Class A, B, C) This summary contains important information about the Class A, B and C 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 Growth Fund investment objective, fees and expenses, principal investment strategies, principal risks and performance.
Statutory Prospectus (Class A, B, C) You should read the accompanying prospectus and any accompanying prospectus supplement, which contain important information, before deciding whether to invest in our securities.
Statutory Prospectus (Class I, R) You should read the accompanying prospectus and any accompanying 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.
Kiplinger 2012 Mutual Funds Rankings The editors of Kiplinger’s Personal Finance magazine rank which funds the feel did the best and which are worth owning now. Calamos Growth Fund, Convertible Fund, and International Growth Fund all make the list.

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

† 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: © 2013 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 1.29% as of the prospectus dated 3/1/2013.

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 6/17/13
Inception Date:
9/4/90
Current NAV:
$50.54
$ Change:
$0.39
% Change:
0.77%
Net Assets*
5.2 bil
(*Total Net Assets as of 3/31/13)

Resources

Morningstar rated the Growth Fund A among 1482, 1278 and 856 Large Growth funds for the overall rating and the 3-, 5-, and 10-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

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 Growth Fund A among 1482, 1278 and 856 Large Growth funds for the overall rating and the 3-, 5-, and 10-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.