13F Insight
DOSSIER · 13F Holders · Q2 2026
SPTX

SEAPORT THERAPEUTICS INC

48 institutions still hold SEAPORT THERAPEUTICS INC as of Q2 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 81221K108·48 13F holders·last filed Jun 30, 2026
Market cap
—
13F value held
$696M
visible holders
Holders
48
filers reporting
Concentration
19.62%
ARCH Venture Management, LLC #1
top holder share
AI Holders Summary · Q2 2026

48 institutions reported SPTX in Q2 2026. ARCH Venture Management, LLC leads at 19.6% of the visible book.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
ARCH Venture Management, LLC
CIK 0001274403
$137M6.3M12.42%Q2 202602
GENERAL ATLANTIC, L.P.
CIK 0001017645
$133M6.1M4.56%Q2 202603
Sofinnova Investments, Inc.
CIK 0001631134
$77M3.6M4.00%Q2 202604
GOLDMAN SACHS GROUP INC
CIK 0000886982
$47M2.2M0.00%Q2 202605
TRV GP VI, LLC
CIK 0001990716
$45M2.1M19.27%Q2 202606
CANADA PENSION PLAN INVESTMENT BOARD
CIK 0001283718
$43M2.0M0.02%Q2 202607
JPMORGAN CHASE & CO
CIK 0000019617
$41M1.8M0.00%Q2 202608
FMR LLC
CIK 0000315066
$26M1.2M0.00%Q2 202609
Bellevue Group AG
CIK 0001674546
$24M1.1M0.50%Q2 202610
Siren, L.L.C.
CIK 0002005245
$24M1.1M0.48%Q2 202611
JENNISON ASSOCIATES LLC
CIK 0000053417
$23M1.1M0.01%Q2 202612
RA CAPITAL MANAGEMENT, L.P.
CIK 0001346824
$15M700K0.13%Q2 202613
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$13M599K0.00%Q2 202614
Woodline Partners LP
CIK 0001784547
$13M586K0.04%Q2 202615
PRINCIPAL FINANCIAL GROUP INC
CIK 0001126328
$9M415K0.00%Q2 202616
Aberdeen Group plc
CIK 0001716774
$7M310K0.01%Q2 202617
UBS Group AG
CIK 0001610520
$6M279K0.00%Q2 202618
BlackRock, Inc.
CIK 0002012383
$5M230K0.00%Q2 202619
SEVEN GRAND MANAGERS, LLC
CIK 0001909126
$5M225K0.20%Q2 202620
CITADEL ADVISORS LLC
CIK 0001423053
$4M191K0.00%Q2 2026
Page 1 of 3
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Insiders at SEAPORT THERAPEUTICS INC
Hombach Robert J. →White Lauren →Healy James →Loebel Antony →Paul Steven M →Torres Denice →Chen Michael Cunyuan →Gladstein Lana →