Seaport Therapeutics' IPO
Listed May 1, 2026 at $18 on Nasdaq as SPTX.
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What does Seaport Therapeutics do?
“We are a clinical-stage therapeutics company focused on inventing and developing new medicines for patients with depression, anxiety, and other debilitating neuropsychiatric disorders.”
| Fact | Seaport Therapeutics |
|---|---|
| Founded | 2002 |
| Headquarters | Boston, Massachusetts |
| Employees | 58 full-time, as of April 1, 2026 |
| Website | seaporttx.com |
What is the offering?
Each figure names the filing it is from and that filing's date. The market cap is Breakaway's arithmetic from the prospectus's share count.
| Fact | Seaport Therapeutics |
|---|---|
| Shares offered | 14,160,000 |
| Offer price | $18 a share |
| Raised at that price | $255 million |
| Underwriters' discount | $17.8 million |
| Underwriters' option | 2,124,000 more shares |
| Underwriters | Goldman Sachs, J.P. Morgan, Leerink Partners, Citigroup, and Stifel |
| Exchange | Nasdaq Global Select Market, as SPTX |
| Shares outstanding after | 53,027,817 |
| Market cap at the offer price | $955 million |
What the filing says about its money
| Fact | Seaport Therapeutics |
|---|---|
| Net loss | $74.9 million, year to December 31, 2025 |
| Last preferred stock | Series B preferred |
What risks does Seaport Therapeutics name first?
- “We are a clinical-stage therapeutics company with a limited operating history, which may make it difficult to evaluate our current business and predict our future success and viability.”
- “Even if this offering is successful, we will require additional funding in order to finance operations.”
- “Our business is highly dependent on the success of our product candidates, particularly GlyphAllo for the treatment of MDD with or without anxious distress and GlyphAgo for the treatment of generalized anxiety disorder, or GAD, and MDD. If we are unable to successfully complete clinical development…”
Every date of Seaport Therapeutics' IPO
| What | Day |
|---|---|
| Registration filed | Apr 10, 2026 |
| Exchange registration filed | Apr 28, 2026 |
| Declared effective by the SEC | Apr 30, 2026 |
| Priced | Apr 30, 2026 |
| First trade | May 1, 2026 |
| Lock-up ends | Oct 27, 2026 |
How did its first days trade?
From its daily bars, each close against its $18 offer price.
| Day | Open | Close | From the offer |
|---|---|---|---|
| May 1 | $21 | $19.84 | +10.2% |
| May 4 | $19.17 | $17 | -5.6% |
| May 5 | $17.35 | $16 | -11.1% |
| May 6 | $16.01 | $16 | -11.1% |
| May 7 | $16.05 | $15.50 | -13.9% |
The other IPOs expected
| Company | Price |
|---|---|
| $19 to $21 | |
| $15 to $17 | |
| $15 to $17 | |
| $7 | |
| $5 to $7 |
Seaport Therapeutics IPO questions
When is Seaport Therapeutics' IPO?
Listed May 1, 2026 at $18 on Nasdaq as SPTX.
What is Seaport Therapeutics' IPO price?
Seaport Therapeutics' IPO priced at $18 a share, per its final prospectus of May 1, 2026.
How many shares is Seaport Therapeutics selling?
14,160,000 shares, and the underwriters may buy 2,124,000 more, per its final prospectus (424B4).
Who are the underwriters?
Goldman Sachs, J.P. Morgan, Leerink Partners, Citigroup, and Stifel, as the prospectus's cover names them.
When does the lock-up end?
Seaport Therapeutics' IPO lock-up ends Oct 27, 2026. Its final prospectus says: “.”
Does Breakaway rate Seaport Therapeutics?
Breakaway scores a new stock from its second trading day, ranked against every US stock it scores. For its first 21 sessions the page says New listing in place of the tier, and each check that needs more history waits for it.
Can Breakaway say where Seaport Therapeutics' price will go?
No. Breakaway does not say where a price will go. Every figure here is from the company's SEC filings, linked on each line.
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