Key facts
- This page summarizes PureTech Health plc's Form 4 filing for Seaport Therapeutics, Inc. (SPTX).
- 6 reported transactions and 6 derivative rows are listed below.
- Accepted by SEC: 06 May 2026, 19:38.
PureTech Health plc - 04 May 2026 Form 4 Insider Report for Seaport Therapeutics, Inc. (SPTX)
- Reporting relationship
- 10%+ Owner
- Issuer ticker
- SPTX
- Reported as of
- 04 May 2026
- Net transaction value
- $0
- SEC form
- 4
- Accepted by SEC
- 06 May 2026, 19:38:15 UTC
- Prior SEC filing
- 30 Apr 2026
- Source filing
- View source filing
- Reporting owner signature
- PureTech LYT, Inc., By: /s/ Robert Lyne
Source evidence
Original filing metadata and source links for verification.
4 source fields
Reporting owner
1 detail
Key filing fact
PureTech Health plc filed Form 4 for Seaport Therapeutics, Inc. (SPTX) on 06 May 2026.
Change
- Previous filing in this sequence was filed on 30 Apr 2026.
- Current net transaction value: $0.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (2)
CIK 0001782999
Primary reporting owner
PureTech Health plc
- Relationship
- 10%+ Owner
- Address
- 6 TIDE STREET, SUITE 400, BOSTON
- Signature
- PureTech LYT, Inc., By: /s/ Robert Lyne
- Signature date
- 06 May 2026
CIK 0002131815
PureTech LYT, Inc.
- Relationship
- 10%+ Owner
- Address
- 6 TIDE STREET, SUITE 400, BOSTON
- Signature
- PureTech Health LLC, By: /s/ Robert Lyne
- Signature date
- 06 May 2026
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
SPTX
transaction
Common Stock
Conversion of derivative security
- Transaction value
- Shares
- +12,736,014
- Change %
- +4211%
- Price
- Shares after
- 13,038,493
- Date
- 04 May 2026
- Ownership
- See footnote
- Footnotes
- F1, F2
SPTX
transaction
Common Stock
Conversion of derivative security
- Transaction value
- Shares
- +12,736,014
- Change %
- +4211%
- Price
- Shares after
- 13,038,493
- Date
- 04 May 2026
- Ownership
- See footnote
- Footnotes
- F1, F2
SPTX
transaction
Common Stock
Conversion of derivative security
- Transaction value
- Shares
- +2,681,265
- Change %
- +21%
- Price
- Shares after
- 15,719,758
- Date
- 04 May 2026
- Ownership
- See footnote
- Footnotes
- F1, F2
SPTX
transaction
Common Stock
Conversion of derivative security
- Transaction value
- Shares
- +2,681,265
- Change %
- +21%
- Price
- Shares after
- 15,719,758
- Date
- 04 May 2026
- Ownership
- See footnote
- Footnotes
- F1, F2
SPTX
transaction
Common Stock
Conversion of derivative security
- Transaction value
- Shares
- +965,255
- Change %
- +6.1%
- Price
- Shares after
- 16,685,013
- Date
- 04 May 2026
- Ownership
- See footnote
- Footnotes
- F1, F2
SPTX
transaction
Common Stock
Conversion of derivative security
- Transaction value
- Shares
- +965,255
- Change %
- +6.1%
- Price
- Shares after
- 16,685,013
- Date
- 04 May 2026
- Ownership
- See footnote
- Footnotes
- F1, F2
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
SPTX
transaction
Derivative
Series A-1 Preferred Stock
Conversion of derivative security
- Transaction value
- Shares
- -40,000,000
- Change %
- -100%
- Price
- $0.000000*
- Shares after
- 0
- Date
- 04 May 2026
- Ownership
- See footnote
- Underlying class
- Common Stock
- Underlying amount
- 12,736,014
- Exercise price
- Footnotes
- F1, F2
SPTX
transaction
Derivative
Series A-1 Preferred Stock
Conversion of derivative security
- Transaction value
- Shares
- -40,000,000
- Change %
- -100%
- Price
- $0.000000*
- Shares after
- 0
- Date
- 04 May 2026
- Ownership
- See footnote
- Underlying class
- Common Stock
- Underlying amount
- 12,736,014
- Exercise price
- Footnotes
- F1, F2
SPTX
transaction
Derivative
Series A-2 Preferred Stock
Conversion of derivative security
- Transaction value
- Shares
- -8,421,052
- Change %
- -100%
- Price
- $0.000000*
- Shares after
- 0
- Date
- 04 May 2026
- Ownership
- See footnote
- Underlying class
- Common Stock
- Underlying amount
- 2,681,265
- Exercise price
- Footnotes
- F1, F2
SPTX
transaction
Derivative
Series A-2 Preferred Stock
Conversion of derivative security
- Transaction value
- Shares
- -8,421,052
- Change %
- -100%
- Price
- $0.000000*
- Shares after
- 0
- Date
- 04 May 2026
- Ownership
- See footnote
- Underlying class
- Common Stock
- Underlying amount
- 2,681,265
- Exercise price
- Footnotes
- F1, F2
SPTX
transaction
Derivative
Series B Preferred Stock
Conversion of derivative security
- Transaction value
- Shares
- -3,031,578
- Change %
- -100%
- Price
- $0.000000*
- Shares after
- 0
- Date
- 04 May 2026
- Ownership
- See footnote
- Underlying class
- Common Stock
- Underlying amount
- 965,255
- Exercise price
- Footnotes
- F1, F2
SPTX
transaction
Derivative
Series B Preferred Stock
Conversion of derivative security
- Transaction value
- Shares
- -3,031,578
- Change %
- -100%
- Price
- $0.000000*
- Shares after
- 0
- Date
- 04 May 2026
- Ownership
- See footnote
- Underlying class
- Common Stock
- Underlying amount
- 965,255
- Exercise price
- Footnotes
- F1, F2
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Section 16 status
PureTech Health plc is no longer subject to Section 16 filing requirements. Form 4 or Form 5 obligations may still apply in specific circumstances.
Explanation of responses 2 footnotes
Footnote F1
Each share of Series A-1, Series A-2 and Series B Preferred Stock (collectively, the "Preferred Stock") was convertible into Common Stock of the Issuer on a one-for-3.1407 basis at the option of the holder, and automatically converted upon the closing of the Issuer's initial public offering without payment of further consideration. The Preferred Stock had no expiration date.
Footnote F2
PureTech LYT, Inc. is the record holder of all of the securities reported in this Form 4. PureTech Health LLC is the sole owner of PureTech LYT, Inc. PureTech Health plc is the sole member of PureTech Health LLC, and has the power to direct the voting and disposition of securities held by PureTech LYT, Inc. and PureTech Health LLC.