Company: PRTC
Filing Date: 2025-06-16
Form Type: 6-K
Source: 0001193125-25-141445
Chunk: 0

Company: PureTech Health plc
Filing Date: 2025-06-16
Form: 6-K
Chunk 0
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### 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 June, 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 office)

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): ☐

INFORMATION CONTAINED IN THIS REPORT ON FORM 6-K On June 16, 2025, PureTech Health plc (LSE: PRTC, Nasdaq: PRTC) (the “Company”) issued a press release announcing the results of its 2025 Annual General Meeting. The full text of the resolutions may be found in the Notice of the Annual General Meeting, copies of which are available on both the Company’s website https://investors.puretechhealth.com/financials-filings/reports and on the National Storage Mechanism. 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: June 16, 2025 |     | PURETECH HEALTH PLC 
 By:                 |     | /s/ Bharatt Chowrira           |
|:--------------------|:----|:--------------------|:----|:-------------------------------|
|                     |     |                     |     | Name: Bharatt Chowrira         |
|                     |     |                     |     | Title: Chief Executive Officer |