Seaport Therapeutics, Inc.

SPTX · NasdaqGS · Stock · Healthcare
$16.68
+3.73% today
Delayed price,

What Seaport Therapeutics does

Seaport Therapeutics, Inc., a clinical-stage therapeutics company, focuses on inventing and developing new medicines for patients with depression, anxiety, and other debilitating neuropsychiatric disorders. It is leveraging its proprietary Glyph platform to advance a pipeline of therapies to address the unmet needs in depression and anxiety. The company's lead product candidate, GlyphAllo (SPT-300 or Glyph Allopregnanolone), is a novel, Glyphed oral prodrug of allopregnanolone, an endogenous molecule that has been clinically validated in third-party trials for the treatment of postpartum depression. Its second product candidate, GlyphAgo (SPT-320 or Glyph Agomelatine), is a novel, Glyphed oral prodrug of agomelatine, a clinically validated anxiolytic and antidepressant that is approved for the treatment of generalized anxiety disorder in Australia and major depressive disorder in Australia and the European Union. The company was founded in 2024 and is based in Boston, Massachusetts.

Key facts

Sector
Healthcare
Industry
Biotechnology
Market cap
$892.9M
P/E (ttm)
—
Forward P/E
-6.6
Dividend yield
0.00%
Beta
—
Profit margin
0.0%
Employees
58
Headquarters
Boston, MA, United States
Exchange
NasdaqGS

Performance

1 Month
-22.0%
3 Months
-20.0%
6 Months
—
1 Year
-15.9%
5 Years
-8.3%
$14.8552-week range$28.38
Biggest setback — last 12 months
-32.9%
31 Aug 2026 → 12 Oct 2026
Fell from $24.86 to $16.68 — its sharpest sustained decline this year.
Biggest run-up — last 12 months
+54.9%
4 May 2026 → 31 Aug 2026
Ran from $16.05 to $24.86 — its strongest sustained advance this year.

Price outlook — trend & volatility model

● Trend: Mixed
Price is not consistently aligned with its short- and long-term averages.
HorizonBear case (−1σ)Base caseBull case (+1σ)
1 Month$13.54 (-18.8%)$16.68$20.54 (+23.2%)
3 Months$11.63 (-30.3%)$16.68$23.93 (+43.5%)
6 Months$10.01 (-40.0%)$16.68$27.79 (+66.6%)
12 Months$8.10 (-51.4%)$16.68$34.33 (+105.8%)
Statistical, not machine-learning: a random-walk (no assumed drift) volatility model built from this ticker's own realized price history, plus a purely descriptive moving-average trend read. Illustrative only — not a price target and not financial advice. The bear and bull cases sit one standard deviation (1σ) below and above today's price, a range that covers about 68% of the outcomes the model treats as plausible, not a 68% chance of either case. Annualized volatility used: 72.2%, blended from this ticker's own 3-month and 1-year realized price history. Base case is deliberately flat — this quantifies a possible range, not a directional prediction. See the full model, including wider (≈95%) bands →

Comparable companies

Recent insider activity

Acquired 13,000 shares at $18.14 — HOMBACH ROBERT J., Director · 2026-06-24
Acquired 16,382,534 shares — PureTech Health plc, 10% Owner · 2026-05-06
Acquired 1,758,599 shares — Zohar Daphne, Chief Executive Officer · 2026-05-04
Acquired 2,731,538 shares — HEALY JAMES, Director · 2026-05-04
Acquired 6,702 shares — White Lauren, Chief Financial Officer · 2026-05-04
Source: SEC Form 4 filings. An "acquired" entry with no price is typically a stock award or option exercise rather than an open-market purchase. Search all insider trades →

Learn the basics

Prices and company data are delayed reference figures from public sources (Yahoo Finance, SEC EDGAR) and may be inaccurate or out of date. This page is informational only — it is not investment advice or a recommendation to buy or sell any security. Past performance does not indicate future results.