Company: PRTC
Filing Date: 2025-07-16
Form Type: 6-K
Source: 0001193125-25-159538
Chunk: 0

Company: PureTech Health plc
Filing Date: 2025-07-16
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): ☐

On July 16, 2025, PureTech Health plc (LSE: PRTC, Nasdaq: PRTC) (the “Company”) issued a press release titled “PureTech Announces Leadership Transition.” 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 16, 2025 |     | PURETECH HEALTH PLC 
 By:                 |     | /s/ Charles Sherwood                  |
|:--------------------|:----|:--------------------|:----|:--------------------------------------|
|                     |     | Name:               |     | Charles Sherwood                      |
|                     |     | Title:              |     | General Counsel and Company Secretary |