Company: PRTC
Filing Date: 2025-07-08
Form Type: 6-K
Source: 0001193125-25-156607
Chunk: 0

Company: PureTech Health plc
Filing Date: 2025-07-08
Form: 6-K
Chunk 0
---
### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 6-K

Report of Foreign Private Issuer

Pursuant to Rule 13a-16or 15d-16

under the Securities Exchange Act of 1934

For the month of July 2025

Commission File Number 001-39670

### PURETECH HEALTH PLC
(Translation of registrant’s name into English)

6 Tide Street, Suite 400

Boston, Massachusetts 02210

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form
20-F or Form 40-F.

Form
20-F ☒ Form 40-F ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by
Regulation S-T Rule 101(b)(1): ☐

Indicate by check mark if the registrant is
submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): ☐

Resignation of Director On July 7, 2025, Raju Kucherlapati, Ph.D. resigned from his position as Chair of the board of directors of PureTech Health plc (the “Company”). Dr. Kucherlapati also served on the Research and Development Committee of the Company’s board of directors. Following Dr. Kucherlapati’s resignation, the Company’s board of directors will consist of six directors. On July 8, 2025, Sharon Barber-Lui, a non-executivedirector, was appointed interim Chair of the board of directors of the Company. On July 8, 2025, the Company issued a press release announcing Dr. Kucherlapati’s resignation and Ms. Barber-Lui’s appointment as interim Chair of the Board of Directors. The press release is furnished herewith as Exhibit 99.1 and is incorporated by reference herein. 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, thereunto duly authorized.

| Date: July 8, 2025 |     | PURETECH HEALTH PLC 
 By:                 |     | /s/ Bharatt Chowrira    |
|:-------------------|:----|:--------------------|:----|:------------------------