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Form 8-K/A

sec.gov

8-K/A — IRONWOOD PHARMACEUTICALS INC

Accession: 0001104659-26-065140

Filed: 2026-05-21

Period: 2026-05-08

CIK: 0001446847

SIC: 2834 (PHARMACEUTICAL PREPARATIONS)

Item: Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K/A

Amendment No.

1

Current Report Pursuant to

Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of Report (Date of

Earliest Event Reported):

May 8, 2026

IRONWOOD

PHARMACEUTICALS, INC.

(Exact name of registrant as specified in its

charter)

Delaware

001-34620

04-3404176

(State

or other jurisdiction

(Commission File Number)

(I.R.S.

Employer

of

incorporation)

Identification

Number)

100

Summer Street, Suite

2300

Boston,

Massachusetts

02110

(Address

of principal

(Zip code)

executive

offices)

(617)

621-7722

(Registrant’s telephone number,

including area code)

Check the appropriate box below if the Form 8-K

filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

¨ Written

communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨ Soliciting

material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨ Pre-commencement

communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨ Pre-commencement

communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class

Trading Symbol(s)

Name of each exchange on which

registered

Class

A common stock, $0.001 par value

IRWD

Nasdaq

Global Select Market

Indicate by check mark whether the registrant is

an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of

the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging

growth company ¨

If

an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying

with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Explanatory Note

This Current Report on Form 8-K/A is being filed

as an amendment (this “Amendment No. 1”) to the Current Report on Form 8-K filed by Ironwood Pharmaceuticals, Inc. (the “Company”)

with the Securities and Exchange Commission on May 13, 2026 (the “Original Report”). In the Original Report, the Company disclosed,

among other events, the appointment of Ronald Silver, the Company’s Senior Vice President, Corporate Controller and Chief Accounting

Officer, as the Company’s interim chief financial officer and principal financial officer, effective May 15, 2026. This Amendment

No. 1 is being filed to provide a description of certain compensation arrangements approved by the Compensation and HR Committee (the

“Committee”) of the board of directors of the Company on May 19, 2026 in connection with Mr. Silver’s new role as interim

chief financial officer and principal financial officer. Except as set forth herein, this Amendment No. 1 does not amend, modify or update

the disclosure contained in the Original Report.

Item 5.02 Departure of Directors or Certain Officers; Election of

Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

On May 19, 2026, in connection with Mr. Silver’s

new role as the Company’s interim chief financial officer and principal financial officer, the Committee approved a monthly interim

assignment fee of $12,250 (the “Interim CFO Assignment Fee”) for Mr. Silver. Mr. Silver’s Interim CFO Assignment Fee

will remain in place until the earlier of the Company’s appointment of a chief financial officer or the termination of the interim

assignment for any other reason. In addition, on May 19, 2026, Mr. Silver received a grant of 25,000 restricted stock units (“RSUs”)

representing the right to receive shares of the Company’s Class A common stock upon vesting of such awards granted under the Company’s

2019 Amended and Restated Equity Incentive Plan. The RSUs will vest over two years as to 50% of the RSUs on each approximate anniversary

of the date of grant.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934,

the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Ironwood Pharmaceuticals, Inc.

Dated: May 21, 2026

By:

/s/ John Minardo

Name: John Minardo

Title: Senior Vice President, Chief Legal Officer and Secretary

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