Seaport Therapeutics (SPTX) Latest Stock Analysis Report – Oct 15, 2026, 4:00 PM ET
Updated Oct 15, 2026, 4:00 PM ET
- Closed at $17.60, +5.52% vs the prior close of $16.68.
- Volume 164.90K shares, 0.8x its 50-day average.
- No new SEC filings since the prior session.
- No new insider buys or sales reported since the prior session.
SPTX jumps 5.5% to $17.60. Closed at $17.60, +5.52% vs the prior close of $16.68. Day range $16.61–$17.89, opened at $16.82.
SPTX daily analysis — what happened
A plain-English, data-only note written after every US trading day. Newest first; older days stay archived below.
Oct 15, 2026 — SPTX jumps 5.5% to $17.60
- Closed at $17.60, +5.52% vs the prior close of $16.68. Day range $16.61–$17.89, opened at $16.82.
- Volume was 164.90K shares, 0.8x its 50-day average of 212.12K.
- Price is -20.0% vs its 50-day average ($22.01).
- 52-week range $14.85–$28.38; today's close sits at 20% of that range, 38.0% below the 52-week high.
Oct 14, 2026 — SPTX jumps 3.7% to $16.68
- Closed at $16.68, +3.73% vs the prior close of $16.08. Day range $15.79–$16.97, opened at $15.98.
- Volume was 208.60K shares, 1.0x its 50-day average of 209.74K.
- Price is -24.5% vs its 50-day average ($22.10).
- 52-week range $14.85–$28.38; today's close sits at 14% of that range, 41.2% below the 52-week high.
Oct 13, 2026 — SPTX slides 6.2% to $16.08, a 3-month low
- Closed at $16.08, -6.24% vs the prior close of $17.15. Day range $16.03–$17.62, opened at $17.08.
- Volume was 227.20K shares, 1.1x its 50-day average of 207.99K.
- Price is -27.6% vs its 50-day average ($22.20).
- 52-week range $14.85–$28.38; today's close sits at 9% of that range, 43.3% below the 52-week high.
Oct 12, 2026 — SPTX slides 5.5% to $17.15, a 3-month low
- Closed at $17.15, -5.51% vs the prior close of $18.15. Day range $17.04–$18.14, opened at $18.14.
- Volume was 126.00K shares, 0.6x its 50-day average of 207.78K.
- Price is -23.1% vs its 50-day average ($22.29).
- 52-week range $14.85–$28.38; today's close sits at 17% of that range, 39.6% below the 52-week high.
Oct 9, 2026 — SPTX rises 1.3% to $18.15
- Closed at $18.15, +1.34% vs the prior close of $17.91. Day range $17.89–$18.79, opened at $18.00.
- Volume was 171.20K shares, 0.8x its 50-day average of 206.40K.
- Price is -18.8% vs its 50-day average ($22.36).
- 52-week range $14.85–$28.38; today's close sits at 24% of that range, 36.0% below the 52-week high.
Oct 8, 2026 — SPTX ends flat (-0.1%) to $17.91
- Closed at $17.91, -0.11% vs the prior close of $17.93. Day range $17.67–$18.46, opened at $17.67.
- Volume was 177.60K shares, 0.9x its 50-day average of 204.40K.
- Price is -20.0% vs its 50-day average ($22.40).
- 52-week range $14.85–$28.38; today's close sits at 23% of that range, 36.9% below the 52-week high.
Oct 7, 2026 — SPTX jumps 3.2% to $17.93
- Closed at $17.93, +3.22% vs the prior close of $17.37. Day range $17.07–$18.29, opened at $17.28.
- Volume was 249.10K shares, 1.2x its 50-day average of 200.92K.
- Price is -20.1% vs its 50-day average ($22.44).
- 52-week range $14.85–$28.38; today's close sits at 23% of that range, 36.8% below the 52-week high.
Oct 6, 2026 — SPTX slides 6.1% to $17.37, a 3-month low
- Closed at $17.37, -6.11% vs the prior close of $18.50. Day range $17.18–$19.05, opened at $18.50.
- Volume was 243.00K shares, 1.2x its 50-day average of 198.42K.
- Price is -22.7% vs its 50-day average ($22.48).
- 52-week range $14.85–$28.38; today's close sits at 19% of that range, 38.8% below the 52-week high.
Oct 5, 2026 — SPTX rises 0.4% to $18.50
- Closed at $18.50, +0.43% vs the prior close of $18.42. Day range $17.52–$18.90, opened at $18.42.
- Volume was 172.50K shares, 0.9x its 50-day average of 196.04K.
- Price is -17.9% vs its 50-day average ($22.54).
- 52-week range $14.85–$28.38; today's close sits at 27% of that range, 34.8% below the 52-week high.
Oct 2, 2026 — SPTX dips 2.8% to $18.42, a 1-month low
- Closed at $18.42, -2.80% vs the prior close of $18.95. Day range $17.85–$19.16, opened at $19.16.
- Volume was 258.70K shares, 1.3x its 50-day average of 192.67K.
- Price is -18.5% vs its 50-day average ($22.59).
- 52-week range $14.85–$28.38; today's close sits at 26% of that range, 35.1% below the 52-week high.
SPTX latest news & SEC filings
Every SEC filing by or about SPTX in the last 120 days, explained in plain English. Updated daily, with a same-day refresh for new filings.
Aug 14, 2026 · Form SCHEDULE 13G — Passive stake (13G)
Passive stake (13G) — an investor reported owning more than 5%
Filed by an outside investor (not the company). It reports a holding of more than 5% of a share class; percentage and holder name are in the filing.
Aug 5, 2026 · Form SCHEDULE 13G — Passive stake (13G)
Passive stake (13G) — an investor reported owning more than 5%
Filed by an outside investor (not the company). It reports a holding of more than 5% of a share class; percentage and holder name are in the filing.
Aug 5, 2026 · Form SCHEDULE 13G — Passive stake (13G)
Passive stake (13G) — an investor reported owning more than 5%
Filed by an outside investor (not the company). It reports a holding of more than 5% of a share class; percentage and holder name are in the filing.
Aug 3, 2026 · Form 10-Q — Quarterly report
Quarterly report (unaudited financial statements for the quarter)
Quarter ended Jun 30, 2026:
- Net income: -$62.60M (prior year -$15.08M) (loss widened vs Jun 30, 2025)
- Diluted EPS: -$1.78 (prior year -$6.40) (loss narrowed vs Jun 30, 2025)
Aug 3, 2026 · Form 8-K — Major event / current report
Current report — a filing companies must make within 4 business days of a major event
- Item 2.02 — Reported results of operations (earnings release).
This is a results-day filing: the earnings press release is attached as an exhibit.
Jun 24, 2026 · Form 4 — Insider trade
Insider trade report (Form 4) — a director, officer or 10%+ owner changed their holdings
- Hombach Robert J. bought 13,000 shares at $18.14 (≈$235.82K) on Jun 22, 2026
Open-market purchases (P) and sales (S) are shown in colour; awards, exercises and tax withholding are routine pay-related moves. Many sales are pre-planned under 10b5-1 plans.
Things to know before you trade SPTX
- Last results release: Aug 3, 2026 (8-K Item 2.02). Previous ones: Jun 8, 2026. Based on that rhythm, the next report is likely around Nov 2, 2026 — an estimate, not a confirmed date.
- How much it moves: over the last 20 sessions the average daily move was 3.97% (largest 8.7%). That is a volatile stock.
- Liquidity: about 321.41K shares (≈$5.66M) trade per day on average.
- 52-week position: $17.60 vs a range of $14.85–$28.38 (20% of the range).
- Dividends: no cash dividends in the last 2 years.
- Splits: none in the last 2 years.
- Insider trades (Form 4, last 12 months, recent 25 shown): 8 open-market buys, 0 sales; latest: Robert J. Hombach bought 13,000 shares on Jun 22, 2026.
- Latest filings: 10-Q Aug 3, 2026; 8-K Aug 3, 2026; 10-Q Jun 8, 2026.
- Listing: Nasdaq · industry: Pharmaceutical Preparations.
SPTX market data (last 20 sessions)
| Date | Open | High | Low | Close | Volume |
|---|---|---|---|---|---|
| Oct 15, 2026 | 16.82 | 17.89 | 16.61 | 17.60 | 164.90K |
| Oct 14, 2026 | 15.98 | 16.97 | 15.79 | 16.68 | 208.60K |
| Oct 13, 2026 | 17.08 | 17.62 | 16.03 | 16.08 | 227.20K |
| Oct 12, 2026 | 18.14 | 18.14 | 17.04 | 17.15 | 126.00K |
| Oct 9, 2026 | 18.00 | 18.79 | 17.89 | 18.15 | 171.20K |
| Oct 8, 2026 | 17.67 | 18.46 | 17.67 | 17.91 | 177.60K |
| Oct 7, 2026 | 17.28 | 18.29 | 17.07 | 17.93 | 249.10K |
| Oct 6, 2026 | 18.50 | 19.05 | 17.18 | 17.37 | 243.00K |
| Oct 5, 2026 | 18.42 | 18.90 | 17.52 | 18.50 | 172.50K |
| Oct 2, 2026 | 19.16 | 19.16 | 17.85 | 18.42 | 258.70K |
| Oct 1, 2026 | 20.12 | 20.71 | 18.37 | 18.95 | 330.20K |
| Sep 30, 2026 | 18.85 | 20.75 | 18.45 | 20.17 | 488.70K |
| Sep 29, 2026 | 19.46 | 19.80 | 18.57 | 18.69 | 288.90K |
| Sep 28, 2026 | 21.31 | 21.99 | 19.22 | 19.64 | 284.50K |
| Sep 25, 2026 | 22.20 | 22.44 | 21.45 | 21.52 | 192.80K |
| Sep 24, 2026 | 21.08 | 21.37 | 19.93 | 21.12 | 105.70K |
| Sep 23, 2026 | 22.12 | 23.07 | 21.03 | 21.29 | 179.30K |
| Sep 22, 2026 | 21.20 | 22.67 | 21.20 | 22.39 | 146.50K |
| Sep 21, 2026 | 21.46 | 21.94 | 20.28 | 21.12 | 234.30K |
| Sep 18, 2026 | 21.88 | 23.10 | 21.29 | 21.39 | 2.18M |
About Seaport Therapeutics
Seaport Therapeutics (SPTX) is listed on the Nasdaq and classified by the SEC under “Pharmaceutical Preparations”. Its business address is in BOSTON, MA. State of incorporation: DE. Fiscal year ends December 31. SEC CIK 2042347.
SPTX board of directors & executives
From SEC Form 3/4/5 insider filings made in the last 12 months (date = latest filing).
Directors
| Name | Role | Latest filing |
|---|---|---|
| (Bermuda) L.P. Gap | Director | May 6, 2026 |
| Coinvestments Iii, Llc Gap | Director | May 6, 2026 |
| Coinvestments Iv, Llc Gap | Director | May 6, 2026 |
| Coinvestments Cda, L.P. Gap | Director | May 6, 2026 |
| Coinvestments V, Llc Gap | Director | May 6, 2026 |
| Atlantic Genpar (Bermuda), L.P. General | Director | May 6, 2026 |
| Atlantic Genpar, L.P. General | Director | May 6, 2026 |
| Atlantic, L.P. General | Director | May 6, 2026 |
| Atlantic (Lux) S.A R.L. General | Director | May 6, 2026 |
| Atlantic (Sp), L.P. General | Director | May 6, 2026 |
| Atlantic (Spv) Gp, Llc General | Director | May 6, 2026 |
| Atlantic Genpar (Lux) Scsp General | Director | May 6, 2026 |
| Atlantic Partners (Lux), Scsp General | Director | May 6, 2026 |
| Atlantic Partners 100, L.P. General | Director | May 6, 2026 |
| James Healy | Director | May 4, 2026 |
| Robert J. Hombach | Director | Jun 24, 2026 |
| Sharon Mates | Director | May 4, 2026 |
| Steven M Paul | Director | May 4, 2026 |
| Sandra E Peterson | Director | May 4, 2026 |
| Jason Pitts | Director | Apr 30, 2026 |
| Denice Torres | Director | May 4, 2026 |
| David E. Wheadon | Director | May 4, 2026 |
| Daphne Zohar | Chief Executive Officer | May 4, 2026 |
Executive officers
| Name | Title | Latest filing |
|---|---|---|
| Michael Cunyuan Chen | Chief Scientific Officer | May 4, 2026 |
| Lana Gladstein | General Counsel | May 4, 2026 |
| Antony Loebel | Chief Medical Officer | May 4, 2026 |
| Lauren White | Chief Financial Officer | May 4, 2026 |
| Daphne Zohar | Chief Executive Officer | May 4, 2026 |
Recent insider buys & sales
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| Jun 22, 2026 | Robert J. Hombach | Buy | 13,000 | $18.14 |
| May 4, 2026 | Venture Partners Xii, L.P. Arch | Buy | 1,100,000 | $18.00 |
| May 4, 2026 | Venture Partners Xii, Llc Arch | Buy | 1,100,000 | $18.00 |
| May 4, 2026 | Robert Nelsen | Buy | 1,100,000 | $18.00 |
| May 4, 2026 | Kristina Burow | Buy | 1,100,000 | $18.00 |
| May 4, 2026 | Steven Gillis | Buy | 1,100,000 | $18.00 |
| May 4, 2026 | Venture Fund Xii, L.P. Arch | Buy | 1,100,000 | $18.00 |
| May 4, 2026 | Keith Crandell | Buy | 1,100,000 | $18.00 |
SPTX financials (annual, from XBRL filings)
| Fiscal year end | Revenue | Net income | Diluted EPS | Operating cash flow |
|---|---|---|---|---|
| No annual XBRL figures available (foreign filers often report on Form 20-F). | ||||
Latest balance sheet: total assets $441.68M, total liabilities $19.08M, cash $64.22M (as of Jun 30, 2026).
SPTX earnings / results-day log
| Date | Filing | Close that day |
|---|---|---|
| Aug 3, 2026 | 8-K Item 2.02 (results) | $20.65 |
| Jun 8, 2026 | 8-K Item 2.02 (results) | $16.20 |
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Information only, not investment advice. BuyMeWhiskey is not a registered investment adviser or broker-dealer; nothing here is a recommendation to buy, sell or hold any security, and there are no price targets. Data comes from SEC EDGAR filings and public end-of-day market data and may be delayed or contain errors. Verify with the company's filings before making decisions. Prices: end-of-day data as of Oct 15, 2026, 4:00 PM ET. Filings: SEC EDGAR. Updated after every US trading day.