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Apr. 01, 2019
Needham Aggressive Growth Fund
Needham Aggressive Growth Fund
THE NEEDHAM FUNDS, INC. Needham Aggressive Growth Fund SUPPLEMENT DATED APRIL 1, 2019 TO THE SUMMARY PROSPECTUSES AND PROSPECTUS DATED MAY 1, 2018
The following relates to the presentation of each fund's performance as it appears in "Bar Chart and Performance Table" in each fund's Summary Prospectus and "Bar Chart and Performance Table" in the "Summary Section" for each fund in the Prospectus: Index Disclaimer The Needham Growth Fund, the Needham Aggressive Growth Fund and the Needham Small Cap Growth Fund (collectively, the "Funds") have been developed solely by Needham Investment Management, L.L.C. (the "Adviser"). The Funds are not in any way connected to or sponsored, endorsed, sold or promoted by the London Stock Exchange Group plc and its group undertakings (collectively, the "LSE Group"). FTSE Russell is a trading name of certain of the LSE Group companies. All rights in the Russell 2000 Total Return Index, the Russell 2000 Index and the Russell 3000 Index (collectively, the "Indexes") vest in the relevant LSE Group company which owns the Index. "Russell^®" is a trade mark of the relevant LSE Group company and is used by any other LSE Group company under license. The Indexes are calculated by or on behalf of FTSE International Limited or its affiliate, agent or partner. The LSE Group does not accept any liability whatsoever to any person arising out of (a) the use of, reliance on or any error in the Indexes or (b) investment in or operation of the Funds. The LSE Group makes no claim, prediction, warranty or representation either as to the results to be obtained from the Funds or the suitability of the Indexes for the purpose to which it is being put by the Adviser. The source of the data for each of the Indexes is the LSE Group. © LSE Group 2019. All rights in the Indexes or data vest in the relevant LSE Group company which owns the Index or the data. Neither LSE Group nor its licensors accept any liability for any errors or omissions in the Indexes or data and no party may rely on any Indexes or data contained in this communication. No further distribution of data from the LSE Group is permitted without the relevant LSE Group company's express written consent. The LSE Group does not promote, sponsor or endorse the content of this communication.
* * * Please retain this Supplement with your Summary Prospectus and Prospectus for future reference.

If the Fund has annual returns for at least one calendar year, provide a table showing the Fund's (A) average annual total return; (B) average annual total return (after taxes on distributions); and (C) average annual total return (after taxes on distributions and redemption). A Money Market Fund should show only the returns described in clause (A) of the preceding sentence. All returns should be shown for 1-, 5-, and 10- calendar year periods ending on the date of the most recently completed calendar year (or for the life of the Fund, if shorter), but only for periods subsequent to the effective date of the Fund's registration statement. The table also should show the returns of an appropriate broad-based securities market index as defined in Instruction 5 to Item 22(b)(7) for the same periods. A Fund that has been in existence for more than 10 years also may include returns for the life of the Fund. A Money Market Fund may provide the Fund's 7-day yield ending on the date of the most recent calendar year or disclose a toll-free (or collect) telephone number that investors can use to obtain the Fund's current 7-day yield. For a Fund (other than a Money Market Fund or a Fund described in General Instruction C.3.(d)(iii)), provide the information in the following table with the specified captions AVERAGE ANNUAL TOTAL RETURNS (For the periods ended December 31, _____). For a Fund that provides annual total returns for only one calendar year or for a Fund that does not include the bar chart because it does not have annual returns for a full calendar year, modify, as appropriate, the narrative explanation required by paragraph (c)(2)(i) (e.g., by stating that the information gives some indication of the risks of an investment in the Fund by comparing the Fund's performance with a broad measure of market performance).

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