13F Insight
DOSSIER · 13F Holders · Q2 2025Most-boughtAI cap-ex
OSG

AMBAC FINL GROUP INC

156 institutions still hold AMBAC FINL GROUP INC as of Q2 2025. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 023139884·156 13F holders·last filed Jun 30, 2025
Market cap
—
▼ 7.0%
vs prior quarter
13F value held
$175M
46.0% inst. owned
of float
Holders
156
+59 QoQ
filers reporting
Activity
+94 / −80
+918 added · −920 reduced
this quarter
Concentration
27.38%
Repertoire Partners LP #1
top holder share
AI Holders Summary · Q2 2025

156 institutions reported OSG in Q2 2025. Repertoire Partners LP leads at 27.4% of the visible book. +59 net new institutions vs prior quarter — accumulation reading.

Top holders

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

#HolderValueShares% port.Quarter
01
Repertoire Partners LP
CIK 0001909393
$48M6.7M33.48%Q2 202502
BlackRock, Inc.
CIK 0002012383
$18M3.9M0.00%Q1 202603
CITADEL ADVISORS LLC
CIK 0001423053
$13M1.7M0.00%Q4 202504
Western Standard LLC
CIK 0001517666
$10M2.2M5.50%Q1 202605
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$9M1.9M0.00%Q1 202606
PRESCOTT GROUP CAPITAL MANAGEMENT, L.L.C.
CIK 0001166152
$7M1.6M0.74%Q1 202607
Wolf Hill Capital Management, LP
CIK 0001785988
$7M1.5M0.66%Q1 202608
GENDELL JEFFREY L
CIK 0001056581
$7M1.4M0.09%Q1 202609
THIRD AVENUE MANAGEMENT LLC
CIK 0001099281
$6M1.3M1.01%Q1 202610
DIMENSIONAL FUND ADVISORS LP
CIK 0000354204· Quasi-passive
$6M1.3M0.00%Q1 202611
MARSHALL WACE, LLP
CIK 0001318757
$6M749K0.01%Q4 202512
Bain Capital Credit, LP
CIK 0001317947
$5M1.1M1.70%Q1 202613
Caption Management, LLC
CIK 0001706766
$5M1.0M0.03%Q1 202614
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$5M1.0M0.00%Q1 202615
STATE STREET CORP
CIK 0000093751
$4M941K0.00%Q1 202616
JACOBS LEVY EQUITY MANAGEMENT, INC
CIK 0000884414
$4M884K0.02%Q1 202617
Nuveen, LLC
CIK 0001871926
$4M800K0.00%Q1 202618
SUSQUEHANNA INTERNATIONAL GROUP, LLP
CIK 0001446194· Market maker
$4M793K0.00%Q1 202619
JANE STREET GROUP, LLC
CIK 0001595888· Market maker
$4M780K0.00%Q1 202620
Bracebridge Capital, LLC
CIK 0001426486
$3M579K0.07%Q1 2026
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