13D Filing: Osmium Partners Owns Activist Stake in Cra International, Inc. (CRAI)

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ITEM 1. Security and Issuer

The name of the issuer is CRA International, Inc. (the “Issuer”). The principal executive office of the Issuer is located at 200 Clarendon Street,
Boston, MA 02116.

ITEM 2. Identity and Background

(a)-(c) and (f) The names of the persons jointly filing this statement on Schedule 13D (the “Reporting Persons”) are: (1) Osmium
Capital, LP, a Delaware limited partnership (“Fund I”); (2) Osmium Capital II, LP, a Delaware limited partnership (“Fund II”); (3) Osmium Spartan, LP, a Delaware limited partnership (“Fund III”)
(4) Osmium Diamond, LP (“Fund IV”, and collectively with Fund I, Fund II, and Fund III, the “Funds”); (5) Osmium Partners, LLC, a Delaware limited liability company (“Osmium Partners”); and (6) John H.
Lewis, a United States citizen (“Mr. Lewis”). Osmium Partners serves as the general partner of Fund I, Fund II, Fund III and Fund IV. Mr. Lewis is the controlling member of Osmium Partners.

The principal business of each of Fund I, Fund II, Fund III and Fund IV is that of a private investment vehicle engaged in investing and trading in a wide
variety of securities and financial instruments for its own account. The principal business of Osmium Partners is providing investment management services and serving as the general partner of Fund I, Fund II, Fund III and Fund IV.
Mr. Lewis’ principal occupation is serving as the Managing Member of Osmium Partners.

(d)–(e) During the last five years, none of the
Reporting Persons have been (a) convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors) or (b) a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result
of such proceeding was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

ITEM 3. Source and Amount of Funds or Other Consideration

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 $11,830,017.91 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

The Reporting Persons have acquired the Issuer’s 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 Issuer’s operations, business strategy or prospects, or from sale or merger of the
Issuer. To evaluate such alternatives, the Reporting Persons will routinely monitor the Issuer’s 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 Issuer’s Common Stock, exchanging information with the Issuer pursuant to appropriate confidentiality or similar agreements,
proposing changes in the Issuer’s 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.

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