CRA International Inc. (CRAI): Osmium Partners Lowers Its Stake

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EXPLANATORY NOTE

The Reporting Persons beneficial ownership has dropped below the 5% Schedule 13D reporting threshold. Therefore, this amendment No. 1 constitutes the
final amendment to the Reporting Persons Schedule 13D and an exit filing for the Reporting Person and terminates the Reporting Persons obligation to further amend the Schedule 13D.

ITEM 3. Source and Amount of Funds or Other Consideration

Item 3 is hereby amended and restated in its entirety as follows:

The source and amount of funds (excluding commissions) used by the Funds in making their purchase of the shares of Common Stock, which includes Common Stock
issuable upon the exercise of Options exercisable within 60 days (Options), owned by each of them in the aggregate was $9,433,930.66 from working capital.

One or more of the Reporting Persons effect purchases of securities through margin accounts which may extend margin credit to the Reporting Persons as and
when required to open or carry positions in the margin accounts, subject to applicable federal margin regulations, stock exchange rules and brokers credit policies. In such instances, the positions held in the margin accounts are pledged as
collateral security for the repayment of debit balances in the accounts.

ITEM 4. Purpose of Transaction

Item 4 is hereby amended and restated in its entirety as follows:

The Reporting Persons have acquired the Issuers Common Stock for investment purposes, and such purchases have been made in the Reporting Persons
ordinary course of business.

In pursuing such investment purposes, the Reporting Persons may further purchase, hold, vote, trade, dispose or otherwise
deal in the Common Stock at times, and in such manner, as they deem advisable to benefit from changes in market prices of such Common Stock, changes in the Issuers operations, business strategy or prospects, or from sale or merger of the
Issuer. To

evaluate such alternatives, the Reporting Persons will routinely monitor the Issuers operations, prospects, business development,
management, competitive and strategic matters, capital structure, and prevailing market conditions, as well as alternative investment opportunities, liquidity requirements of the Reporting Persons and other investment considerations. Consistent with
its investment research methods and evaluation criteria, the Reporting Persons may discuss such matters with management or directors of the Issuer, other shareholders, industry analysts, existing or potential strategic partners or competitors,
investment and financing professionals, sources of credit and other investors. Such factors and discussions may materially affect, and result in, the Reporting Persons modifying their ownership of the Issuers Common Stock, exchanging
information with the Issuer pursuant to appropriate confidentiality or similar agreements, proposing changes in the Issuers operations, governance or capitalization, or in proposing one or more of the other actions described in subsections (a)
through (j) of Item 4 of Schedule 13D.

The Reporting Persons reserve the right to formulate other plans and/or make other proposals, and take such
actions with respect to their investment in the Issuer, including any or all of the actions set forth in paragraphs (a) through (j) of Item 4 of Schedule 13D, or acquire additional shares or dispose of all the shares beneficially owned by them, in
the public market or privately negotiated transactions. The Reporting Persons may at any time reconsider and change their plans or proposals relating to the foregoing.

ITEM 5. Interest in Securities of the Issuer

Item 5
is hereby amended and restated in its entirety as follows:

(a) The Reporting Persons beneficially own:

(i) Fund I directly owns 162,561 shares of Common Stock representing 1.8% of all of the outstanding shares of Common Stock of the Issuer.

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