Amendment to Current Report (Form 8-K/A)

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM

(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): December 12, 2025 (December 10, 2025)

BRANDYWINE REALTY TRUST

BRANDYWINE OPERATING PARTNERSHIP, L.P.

(Exact name of registrant as specified in charter)

2929 Arch Street

Suite 1800

Philadelphia, 19104

(Address of principal executive offices) (Zip Code)

(610)

(Registrant's telephone number, including area code)

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

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

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 of the Securities Exchange Act of 1934 of this chapter).

:

Emerging growth company ☐

:

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 "Amendment") amends the Current Report on filed by Brandywine Realty Trust (the "Company") with the Securities and Exchange Commission on December 12, 2025 (the "Original Report"). The Company is filing this Amendment to provide supplemental information under Item 5.02 regarding the retirement of George D. Johnstone. This Amendment supplements, and should be read in conjunction with, Item 5.02 of the Original Report.

The Original Report disclosed that George D. Johnstone, the Company's Executive Vice President - Operations, informed the Company of his intent to retire by the end of the first quarter of 2026 and that Mr. Johnstone and the Company expected to enter into a transition agreement in connection with his retirement.

On March 10, 2026, the Company and Mr. Johnstone entered into a Transition Services and Release Agreement (the "Transition Agreement"). The Transition Agreement confirms Mr. Johnstone's retirement from his position as the Company's Executive Vice President - Operations, effective as of February 20, 2026 (the "Transition Date") and provides that Mr. Johnstone will serve as a Senior Adviser to the Company from the Transition Date until August 20, 2026 (the "Cessation Date") to support an orderly transition of his former duties to other Company personnel. The Transition Agreement also subjects Mr. Johnstone to and restrictions until the Cessation Date and includes a general release of claims and customary cooperation and provisions.

As compensation for his service under (and subject to his compliance with) the Transition Agreement, Mr. Johnstone will receive payments totaling $400,000: (i) $240,000 to be paid on the first regularly scheduled payroll date after the release becomes irrevocable, and (ii) $160,000 to be paid in equal installments at regular payroll intervals from April through August 2026.

The foregoing description of the Transition Agreement is not complete and is subject to, and qualified in its entirety by, the terms of the Transition Agreement, which is filed herewith as Exhibit 10.1 and incorporated herein by reference.

(d) Exhibits

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.

B RANDYWINE R EALTY T RUST
By:		/s/ Gerard H. Sweeney
		Gerard H. Sweeney
		President and Chief Executive Officer
B RANDYWINE O PERATING P ARTNERSHIP , L.P.
B Y :  B RANDYWINE R EALTY T RUST , ITS G ENERAL P ARTNER
B Y :		/s/ Gerard H. Sweeney
		Gerard H. Sweeney
		President and Chief Executive Officer

Date: March 13, 2026