13F Insight
DOSSIER · 13F Holders · Q1 2026High-convictionMulti-bagger

SUTRO BIOPHARMA INC

9 institutions still hold SUTRO BIOPHARMA INC as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 869367102·9 13F holders·last filed Mar 31, 2026
Market cap
—
▼ 2.2%
vs prior quarter
13F value held
$7M
76.0% inst. owned
of float
Holders
9
+41 QoQ
filers reporting
Activity
+15 / −75
+985 added · −868 reduced
this quarter
Concentration
93.89%
Merck & Co., Inc. #1
top holder share
AI Holders Summary · Q1 2026

9 institutions reported SUTRO BIOPHARMA INC in Q1 2026. Merck & Co., Inc. leads at 93.9% of the visible book. +41 net new institutions vs prior quarter — accumulation reading.

Top holders

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

#HolderValueShares% port.Quarter
01
Merck & Co., Inc.
CIK 0000310158
$7M272K1.94%Q1 202602
AJU IB Investment Co., Ltd.
CIK 0001710065
$435,92518K1.43%Q1 202603
Fortitude Family Office, LLC
CIK 0001950506
$1,395560.00%Q1 202604
Bogart Wealth, LLC
CIK 0001715740
$1,246500.00%Q1 202605
Parallel Advisors, LLC
CIK 0001690010
$1,171470.00%Q1 202606
Accredited Wealth Management, LLC
CIK 0002056519
$86950.00%Q3 202507
EverSource Wealth Advisors, LLC
CIK 0001710537
$473190.00%Q1 202608
Advisory Services Network, LLC
CIK 0001573876
$374150.00%Q1 202609
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00—Q2 2025