UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

SCHEDULE 13G

(Rule 13d-102)

Information to be Included in Statements Filed Pursuant

to § 240.13d-1(b), (c) and (d) and Amendments Thereto Filed

Pursuant to § 240.13d-2

Under the Securities Exchange Act of 1934

(Amendment No.     )

Flywire Corporation

(Name of Issuer)

Voting Common Stock, $0.0001

par value per share

(Title of Class of Securities)

302492103

(CUSIP Number)

December 31, 2021

(Date of Event Which Requires Filing of This Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

☐ Rule 13d-1(b)

☐ Rule 13d-1(c)

☒ Rule 13d-1(d)

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934, as amended (“Act”), or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

Item 1(a). Name of Issuer

The name of the issuer to which this filing on Schedule 13G relates is Flywire Corporation (the “Issuer”).

Item 1(b). Address of Issuer’s Principal Executive Offices

The principal executive offices of the Issuer are located at 141 Tremont Street #10, Boston, Massachusetts 02111.

Item 2(a). Name of Person Filing

This Schedule 13G is being filed jointly by Bain Capital Venture Fund 2014, L.P., a Cayman Islands exempted limited partnership (“BCV Fund 2014”), BCIP Venture Associates, a Delaware limited partnership (“BCIP Venture”), Bain Capital Venture Fund 2016, L.P., a Cayman Islands exempted limited partnership (“BCV Fund 2016”), Bain Capital Venture Coinvestment Fund II, L.P., a Cayman Islands exempted limited partnership (“BCV Coinvest Fund II”), BCIP Venture Associates II, LP, a Delaware limited partnership (“BCIP Venture II”), BCIP Venture Associates-B, a Delaware limited partnership (“BCIP Venture-B”), BCV 2019-MD Coinvestment II, L.P., a Cayman Islands exempted limited partnership (“BCV 2019-MD Coinvest II”), and BCIP Venture Associates II-B, LP, a Delaware limited partnership (“BCIP Venture II-B” and, together with BCV Fund 2014, BCIP Venture, BCV Fund 2016, BCV Coinvest Fund II, BCIP Venture II, BCIP Venture-B and BCV 2019-MD Coinvest II, the “Reporting Persons”).

Bain Capital Venture Investors, LLC, a Delaware limited liability company (“BCVI”), is the (i) general partner of Bain Capital Venture Partners 2014, L.P., a Cayman Islands exempted limited partnership (“BCV Partners 2014”), which is the general partner of BCV Fund 2014, (ii) general partner of Bain Capital Venture Partners 2016, L.P., a Cayman Islands exempted limited partnership (“BCV Partners 2016”), which is the general partner of BCV Fund 2016 and (iii) the manager of Bain Capital Venture Coinvestment II Investors, LLC, a Cayman Islands limited liability company (“BCV Coinvest II Investors”), which is the general partner of each of BCV Coinvest Fund II and BCV 2019-MD Coinvest II.

Boylston Coinvestors, LLC, a Delaware limited liability company (“Boylston”), is the (i) managing partner of each of BCIP Venture and BCIP Venture-B and (ii) general partner of each of BCIP Venture II and BCIP Venture II-B.

The governance, investment strategy and decision-making process with respect to the investments held by the Reporting Persons is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal.

As a result, each of BCVI and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to the securities held by the Reporting Persons.

The Reporting Persons have entered into a Joint Filing Agreement, dated February 14, 2022, pursuant to which the Reporting Persons have agreed to file this Schedule 13G jointly in accordance with the provisions of Rule 13d-1(k)(1) promulgated under the Act.

Item 2(b). Address of Principal Business Office or, if None, Residence

The principal business address of each of the Reporting Persons, BCVI, BCV Partners 2014, BCV Partners 2016, BCV Coinvest II Investors, Boylston and Messrs. Salem and Agarwal is 200 Clarendon Street, Boston, Massachusetts 02116.

Item 2(c). Citizenship

BCV Fund 2014, BCV Fund 2016, BCV Coinvest Fund II, BCV 2019-MD Coinvest II, BCV Partners 2014, BCV Partners 2016 and BCV Coinvest II Investors are each organized under the laws of the Cayman Islands. BCVI, Boylston, BCIP Venture, BCIP Venture-B, BCIP Venture II and BCIP Venture II-B are each organized under the laws of the State of Delaware. Messrs. Salem and Agarwal are citizens of the United States.

Item 2(d). Title of Class of Securities

The class of securities of the Issuer to which this Schedule 13G relates is Voting Common Stock, $0.0001 par value per share (“Voting Common Stock”).

Item 2(e). CUSIP Number

The CUSIP number of the Voting Common Stock is 302492103.

Item 3. If this statement is filed pursuant to §§ 240.13d-1(b), or 240.13d-2(b) or (c), check whether the person filing is a

If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution.

(a) Amount beneficially owned:

As of the close of business on December 31, 2021, (i) BCV Fund 2014 held 13,573,035 shares of Voting Common Stock, representing approximately 13.8% of the outstanding shares of Voting Common Stock, (ii) BCIP Venture held 1,383,753 shares of Voting Common Stock, representing approximately 1.4% of the outstanding shares of Voting Common Stock, (iii) BCV Fund 2016 held 904,821 shares of Voting Common Stock, representing approximately 0.9% of the outstanding shares of Voting Common Stock, (iv) BCV Coinvest Fund II held 423,600 shares of Voting Common Stock, representing approximately 0.4% of the outstanding shares of Voting Common Stock, (v) BCIP Venture II held 134,475 shares of Voting Common Stock, representing approximately 0.1% of the outstanding shares of Voting Common Stock, (vi) BCIP

Venture-B held 93,096 shares of Voting Common Stock, representing less than 0.1% of the outstanding shares of Voting Common Stock, (vii) BCV 2019-MD Coinvest II held 16,944 shares of Voting Common Stock, representing less than 0.1% of the outstanding shares of Voting Common Stock and (viii) BCIP Venture II-B held 10,140 shares of Voting Common Stock, representing less than 0.1% of the outstanding shares of Voting Common Stock.

As a result of the foregoing and the relationships described in Item 2(a) of this Schedule 13G, the Reporting Persons may be deemed to collectively beneficially own an aggregate of 16,539,864 shares of Voting Common Stock, representing approximately 16.8% of the outstanding shares of Voting Common Stock.

The percentage of the outstanding shares of Common Stock held by the Reporting Persons is based on 98,693,094 shares of Voting Common Stock issued and outstanding, as reported by the Issuer in its Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on November 12, 2021.

(b) Percent of class:

See Item 4(a) hereof.

(c) Number of shares as to which the person has:

(i) Sole power to vote or to direct the vote:

0

(ii) Shared power to vote or direct the vote:

(iii) Sole power to dispose or to direct the disposition of:

0

(iv) Shared power to dispose or to direct the disposition of:

Item 5. Ownership of Five Percent or Less of a Class

Not applicable.

Item 6. Ownership of More than Five Percent on Behalf of Another Person

Not applicable.

Item 7. Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company or Control Person

Not applicable.

Item 8. Identification and Classification of Members of the Group

Not applicable.

Item 9. Notice of Dissolution of Group

Not applicable.

Item 10. Certifications

Not applicable.

SIGNATURES

After reasonable inquiry and to the best of its knowledge and belief, the undersigned certifies that the information in this statement is true, complete and correct.

Exhibit A

AGREEMENT REGARDING THE JOINT FILING OF

SCHEDULE 13G

The undersigned hereby agree as follows: