SPTX · Insider trading · 13F holders · Congress trades
Seaport Thereapeutics, Inc. (SPTX)
Who is buying and selling SPTX: company insiders on SEC Form 4, hedge funds and superinvestors on Form 13F, and members of Congress under the STOCK Act. Every figure links to the filing or page it comes from.
- 13F filers holding
- 6
- Insider buys, 90 days
- $0
- Insider sales, 90 days
- $0
- Congress trades, 12 months
- 0
SPTX at a glance
- No open-market insider purchases or sales of SPTX were filed in the last 90 days.
- 6 13F filers hold SPTX among their 50 largest positions, worth $410.9M combined. The biggest bets by portfolio weight are ARCH Venture Management, LLC (12.4%), Foresite Capital Management VI LLC (6.0%) and General Atlantic, L.P. (4.6%). In their latest 13Fs, 3 managers opened a new position and 0 added to one.
- No member of Congress has disclosed a trade in SPTX.
SPTX insider trading
No open-market insider purchases or sales of SPTX were filed in the last 90 days.
Who owns SPTX? Hedge funds and superinvestors
6 13F filers hold SPTX among their 50 largest positions, worth $410.9M combined. The biggest bets by portfolio weight are ARCH Venture Management, LLC (12.4%), Foresite Capital Management VI LLC (6.0%) and General Atlantic, L.P. (4.6%). In their latest 13Fs, 3 managers opened a new position and 0 added to one.
| Manager | % of portfolio | Value | Shares | Last quarter | 13F |
|---|---|---|---|---|---|
| ARCH Venture Management, LLCVenture capital | 12.4% | $136.6M | 6,294,951 | New | Q2 2026 |
| General Atlantic, L.P.Hedge fund | 4.6% | $132.5M | 6,101,582 | New | Q2 2026 |
| Sofinnova Investments, Inc.Hedge fund | 4.1% | $77.4M | 3,564,871 | — | Q2 2026 |
| Foresite Capital Management VI LLCHedge fund | 6.0% | $38.7M | 1,779,521 | New | Q2 2026 |
| Bellevue Group AGInvestment manager | 0.5% | $23.9M | 1,100,000 | — | Q2 2026 |
| Pentwater Capital Management LPHedge fund | 0.0% | $1.8M | 83,000 | — | Q2 2026 |
Each manager counts with its latest 13F (Q2 2026: 6). Screen SPTX in the grand portfolio →
SPTX stock trades by members of Congress
No member of Congress has disclosed a trade in SPTX.
SPTX questions and answers
Are insiders buying SPTX stock?
No open-market insider purchases or sales of SPTX were filed in the last 90 days.
Which hedge funds own SPTX?
6 13F filers hold SPTX among their 50 largest positions, worth $410.9M combined. The biggest bets by portfolio weight are ARCH Venture Management, LLC (12.4%), Foresite Capital Management VI LLC (6.0%) and General Atlantic, L.P. (4.6%). In their latest 13Fs, 3 managers opened a new position and 0 added to one.
Has Congress traded SPTX?
No member of Congress has disclosed a trade in SPTX.
Who is the largest holder of SPTX?
Among 13F filers, ARCH Venture Management, LLC reports the largest SPTX position, $136.6M (6,294,951 shares) in its Q2 2026 13F. The biggest bet by portfolio weight is ARCH Venture Management, LLC's: 12.4% of its portfolio.
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