Security key
81221K108
Seaport Therapeutics, Inc. - Voting Common Stock, $0.0001 par value per share (SPTX)
CUSIP: 81221K108
Q2 2026 13F Holders as of 30 Jun 2026
- Security type / class
- Equity / Voting Common Stock, $0.0001 par value per share
- Total 13F shares
- 2,360,545
- Total 13F value
- $51,271,413
- Share change
- +2,360,545
- SEC-reported price per share
- $21.72
- Number of holders
- 11
- Value change
- +$51,271,413
- Number of buys
- 11
- Shares outstanding
- 57,423,044
Holder snapshot
5 signals
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q2 2026
Institutions
11
Top holders
10
SPTX full security history
Ownership snapshot
Full 13F holder table
Seaport Therapeutics, Inc. SEC filings
Seaport Therapeutics, Inc. company facts
Broader feeds
Reporting periods
Holder history for CUSIP 81221K108
Recent filing periods:
Ownership snapshot
Top reported holders of SPTX - Seaport Therapeutics, Inc. - Voting Common Stock, $0.0001 par value per share (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Zohar Daphne
Disclosed value leader
Zohar Daphne
Comparable rows
2/15
Latest evidence
30 Jun 2026
13D/G
3/4/5
Lead comparable stake: 9.1%
13 rows are not safely comparable across share classes.
13D/G row: Zohar Daphne
Showing 1-6 of 15 holder rows.
Quick read
Zohar Daphne leads the comparable SEC ownership view at 9.1%.
2 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Zohar Daphne's linked filing trail.
Comparable ownership
Top 2
Zohar Daphne
9.1%
Steven M. Paul
6.3%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Zohar Daphne |
13D/G
3/4/5
Chief Executive Officer, Director
|
9.1%
|
$105,032,490
5,225,497 shares
|
$0 | 30 Jun 2026 |
| Steven M. Paul |
13D/G
3/4/5
PAUL STEVEN M · Director
|
6.3%
|
$70,686,032
3,516,718 shares
|
$0 | 30 Jun 2026 |
| PureTech Health plc |
3/4/5
10%+ Owner
|
—
class O/S missing
|
—
16,685,013 shares
|
— | 04 May 2026 |
| PureTech LYT, Inc. |
3/4/5
10%+ Owner
|
—
class O/S missing
|
—
16,685,013 shares
|
— | 04 May 2026 |
| ARCH Venture Fund XII, L.P. |
3/4/5
10%+ Owner
|
—
class O/S missing
|
—
6,294,951 shares
|
— | 04 May 2026 |
| ARCH Venture Partners XII, L.P. |
3/4/5
10%+ Owner
|
—
class O/S missing
|
—
6,294,951 shares
|
— | 04 May 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
13F holder rows
Institutional holders as of Q2 2026
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
11
Shares
2,360,545
Rows available
11
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q2 2026 vs Q1 2026 Across Filers
Q1 2026 holders
0
Q2 2026 holders
11
Holder diff
11
| Investor | Q1 2026 Shares | Q2 2026 Shares | Share Diff | Share Chg % | Q1 2026 value | Q2 2026 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend