Stocks · Health care · Pharmaceutical Preparations

Seaport Therapeutics, Inc.

SPTX
United States Fiscal year ends December CIK 0002042347
$18.15 +1.34% Close, 9 Oct 2026

Price, with every insider trade on it

Closing prices, 12 months · point at a dot for who traded, or at the line for the close
18.15 on 9 Oct 2026
28 22 15 May 2026 Jul 2026 Oct 2026 1 May 2026 $19.84 4 May 2026 $17.00 5 May 2026 $16.00 6 May 2026 $16.00 7 May 2026 $15.50 8 May 2026 $16.05 11 May 2026 $15.25 12 May 2026 $15.95 13 May 2026 $16.50 14 May 2026 $16.94 15 May 2026 $16.81 18 May 2026 $15.74 19 May 2026 $15.66 20 May 2026 $15.78 21 May 2026 $17.19 22 May 2026 $17.50 26 May 2026 $18.01 27 May 2026 $18.05 28 May 2026 $18.80 29 May 2026 $18.19 1 Jun 2026 $17.13 2 Jun 2026 $17.21 3 Jun 2026 $17.23 4 Jun 2026 $17.88 5 Jun 2026 $16.44 8 Jun 2026 $16.20 9 Jun 2026 $17.66 10 Jun 2026 $17.12 11 Jun 2026 $17.72 12 Jun 2026 $18.00 15 Jun 2026 $17.44 16 Jun 2026 $17.97 17 Jun 2026 $17.10 18 Jun 2026 $18.17 22 Jun 2026 $17.99 23 Jun 2026 $18.97 24 Jun 2026 $19.31 25 Jun 2026 $19.36 26 Jun 2026 $21.40 29 Jun 2026 $22.52 30 Jun 2026 $21.72 1 Jul 2026 $21.45 2 Jul 2026 $20.57 6 Jul 2026 $19.37 7 Jul 2026 $18.23 8 Jul 2026 $21.26 9 Jul 2026 $20.51 10 Jul 2026 $21.58 13 Jul 2026 $20.10 14 Jul 2026 $20.44 15 Jul 2026 $20.45 16 Jul 2026 $19.52 17 Jul 2026 $20.85 20 Jul 2026 $20.55 21 Jul 2026 $21.00 22 Jul 2026 $21.30 23 Jul 2026 $21.94 24 Jul 2026 $21.10 27 Jul 2026 $20.54 28 Jul 2026 $19.90 29 Jul 2026 $19.74 30 Jul 2026 $20.32 31 Jul 2026 $20.46 3 Aug 2026 $20.65 4 Aug 2026 $21.43 5 Aug 2026 $22.34 6 Aug 2026 $23.09 7 Aug 2026 $23.62 10 Aug 2026 $23.02 11 Aug 2026 $23.36 12 Aug 2026 $23.80 13 Aug 2026 $23.71 14 Aug 2026 $24.22 17 Aug 2026 $24.40 18 Aug 2026 $23.97 19 Aug 2026 $24.42 20 Aug 2026 $24.04 21 Aug 2026 $24.31 24 Aug 2026 $24.08 25 Aug 2026 $24.83 26 Aug 2026 $27.84 27 Aug 2026 $26.25 28 Aug 2026 $24.04 31 Aug 2026 $23.68 1 Sep 2026 $23.61 2 Sep 2026 $24.91 3 Sep 2026 $24.29 4 Sep 2026 $24.86 8 Sep 2026 $24.06 9 Sep 2026 $21.75 10 Sep 2026 $23.28 11 Sep 2026 $23.34 14 Sep 2026 $24.70 15 Sep 2026 $22.96 16 Sep 2026 $22.14 17 Sep 2026 $21.82 18 Sep 2026 $21.39 21 Sep 2026 $21.12 22 Sep 2026 $22.39 23 Sep 2026 $21.29 24 Sep 2026 $21.12 25 Sep 2026 $21.52 28 Sep 2026 $19.64 29 Sep 2026 $18.69 30 Sep 2026 $20.17 1 Oct 2026 $18.95 2 Oct 2026 $18.42 5 Oct 2026 $18.50 6 Oct 2026 $17.37 7 Oct 2026 $17.93 8 Oct 2026 $17.91 9 Oct 2026 $18.15 ARCH Venture Partners XII, LLC 10% owner Bought $19.80M 4 May 2026 · at $18.00 · 21.2% of stake HOMBACH ROBERT J. Director Bought $235.77K 22 Jun 2026 · at $18.14
2 buys0 sales at will0 planned sales

Latest insider transactions

From Form 4, most recent first
All of them →
DateInsiderTypeValueOf own stake
22 Jun 2026 HOMBACH ROBERT J.
Director
Bought $235.77K opened
4 May 2026 ARCH Venture Partners XII, LLC
10% owner
Bought $19.80M 21.2%