13F Insight
DOSSIER · 13F Holders · Q1 2026Cheap mega-capRe-rated
RGEN 1 12/15/28

REPLIGEN CORP

54 institutions still hold REPLIGEN CORP as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 759916AD1·54 13F holders·last filed Mar 31, 2026
Market cap
—
▼ 4.9%
vs prior quarter
13F value held
$518M
51.0% inst. owned
of float
Holders
54
-14 QoQ
filers reporting
Activity
+77 / −79
+813 added · −736 reduced
this quarter
Concentration
19.04%
BRAIDWELL LP #1
top holder share
AI Holders Summary · Q1 2026

54 institutions reported RGEN 1 12/15/28 in Q1 2026. BRAIDWELL LP leads at 19.0% of the visible book. -14 net institutions QoQ — distribution reading.

Top holders

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

#HolderValueShares% port.Quarter
01
BRAIDWELL LP
CIK 0001920938
$99M101.0M3.29%Q1 202602
DeepCurrents Investment Group LLC
CIK 0001754535
$92M94.4M2.94%Q1 202603
Aequim Alternative Investments LP
CIK 0001728201
$79M81.3M1.54%Q1 202604
FRANKLIN RESOURCES INC
CIK 0000038777
$52M53.2M0.01%Q1 202605
ZAZOVE ASSOCIATES LLC
CIK 0001009012
$29M26.3M2.49%Q1 202606
Wellesley Asset Management
CIK 0001533551
$22M24.5M2.32%Q1 202607
ADVENT CAPITAL MANAGEMENT /DE/
CIK 0001097278
$20M20.8M0.56%Q1 202608
Calamos Advisors LLC
CIK 0001316507
$15M15.2M0.05%Q1 202609
AMERIPRISE FINANCIAL INC
CIK 0000820027
$12M12.5M0.00%Q1 202610
STATE STREET CORP
CIK 0000093751
$12M12.4M0.00%Q1 202611
BNP PARIBAS FINANCIAL MARKETS
CIK 0001166588
$12M12.0M0.01%Q1 202612
SHENKMAN CAPITAL MANAGEMENT INC
CIK 0001275228
$11M11.4M1.36%Q1 202613
BlackRock, Inc.
CIK 0002012383
$9M9.7M0.00%Q1 202614
OAKTREE CAPITAL MANAGEMENT LP
CIK 0000949509
$9M9.0M0.13%Q1 202615
TENOR CAPITAL MANAGEMENT Co., L.P.
CIK 0001346554
$8M8.1M0.12%Q1 202616
FMR LLC
CIK 0000315066
$8M8.1M0.00%Q1 202617
DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main
CIK 0001694217
$8M7.8M0.01%Q1 202618
Lombard Odier Asset Management (Europe) Ltd
CIK 0001535784
$7M7.5M0.40%Q1 202619
Fort Baker Capital Management LP
CIK 0001688382
$7M7.5M0.57%Q1 202620
Opti Capital Management, LP
CIK 0001738654
$6M6.6M0.46%Q1 2026
Page 1 of 3
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