AMBAC FINL GROUP INC

Ticker: OSG CUSIP: 023139884 Class: Common Stock

Note: Option positions (PUT/CALL) are excluded.

InstitutionSharesValue ($000)
BlackRock, Inc.4,488,468$34,920
VANGUARD GROUP INC2,508,395$19,515
Western Standard LLC2,504,627$19,486
Wolf Hill Capital Management, LP1,888,973$14,696
DIMENSIONAL FUND ADVISORS LP1,685,627$13,114
GENDELL JEFFREY L1,569,472$12,210
JANE STREET GROUP, LLC1,520,654$11,831
Bain Capital Credit, LP1,108,012$8,620
Caption Management, LLC1,071,094$8,333
GEODE CAPITAL MANAGEMENT, LLC1,024,547$7,973
STATE STREET CORP943,368$7,339
MORGAN STANLEY938,712$7,303
PRESCOTT GROUP CAPITAL MANAGEMENT, L.L.C.893,517$6,952
Nuveen, LLC810,279$6,304
THIRD AVENUE MANAGEMENT LLC782,093$6,085
GOLDMAN SACHS GROUP INC779,975$6,068
MARSHALL WACE, LLP748,572$5,824
BARCLAYS PLC680,441$5,294
Bracebridge Capital, LLC579,234$4,506
SUSQUEHANNA INTERNATIONAL GROUP, LLP526,588$4,097
ESSEX INVESTMENT MANAGEMENT CO LLC410,822$3,196
SG Americas Securities, LLC403,237$3
CHARLES SCHWAB INVESTMENT MANAGEMENT INC361,424$2,812
Russell Investments Group, Ltd.346,258$2,694
BANK OF AMERICA CORP /DE/330,901$2,574
NORTHERN TRUST CORP323,146$2,514
MILLENNIUM MANAGEMENT LLC303,282$2,360
CITADEL ADVISORS LLC287,283$2,235
BRIDGEWAY CAPITAL MANAGEMENT, LLC245,387$1,909
JACOBS LEVY EQUITY MANAGEMENT, INC237,185$1,845
Arrowpoint Investment Partners (Singapore) Pte. Ltd.203,011$1,579
Harbor Advisors LLC196,382$1,528
VELA Investment Management, LLC178,752$1,391
Schonfeld Strategic Advisors LLC169,824$1,321
Invesco Ltd.156,504$1,218
UBS Group AG153,864$1,197
JPMORGAN CHASE & CO152,695$1,188
Bank of New York Mellon Corp138,173$1,075
Legato Capital Management LLC132,620$1,032
AMERICAN CENTURY COMPANIES INC123,599$962
HRT FINANCIAL LP111,702$1
ExodusPoint Capital Management, LP109,765$854
Cruiser Capital Advisors, LLC107,140$834
Point72 Asset Management, L.P.103,544$806
HSBC HOLDINGS PLC92,040$713
Walleye Capital LLC88,284$687
BNP PARIBAS ARBITRAGE, SA86,734$675
WELLS FARGO & COMPANY/MN85,734$667
Jump Financial, LLC85,213$663
Engineers Gate Manager LP81,585$635
Quantinno Capital Management LP78,678$612
NORGES BANK75,000$584
PRICE T ROWE ASSOCIATES INC /MD/70,941$1
AQR CAPITAL MANAGEMENT LLC70,128$546
Connor, Clark & Lunn Investment Management Ltd.68,773$535
Creative Planning68,537$533
SEI INVESTMENTS CO66,718$519
Diametric Capital, LP66,478$517
CAXTON ASSOCIATES LLP65,647$511
DLD Asset Management, LP60,421$470
RHUMBLINE ADVISERS57,471$447
PRUDENTIAL FINANCIAL INC54,340$423
Calamos Advisors LLC49,089$382
TWO SIGMA INVESTMENTS, LP45,044$350
D. E. Shaw & Co., Inc.44,126$343
Y-Intercept (Hong Kong) Ltd43,781$341
BALYASNY ASSET MANAGEMENT L.P.42,917$334
FOX RUN MANAGEMENT, L.L.C.42,354$330
AXQ CAPITAL, LP40,374$314
ALLIANCEBERNSTEIN L.P.37,530$292
XTX Topco Ltd31,058$242
PEAK6 LLC30,478$237
IMC-Chicago, LLC26,303$205
DEUTSCHE BANK AG\25,647$200
OXFORD ASSET MANAGEMENT LLP25,413$198
RENAISSANCE TECHNOLOGIES LLC25,158$196
Metis Global Partners, LLC25,136$196
KLCM Advisors, Inc.23,900$186
CIBC Asset Management Inc23,893$186
Aquatic Capital Management LLC23,067$179
ACADIAN ASSET MANAGEMENT LLC23,053$0
Quadrature Capital Ltd21,219$165
INTECH INVESTMENT MANAGEMENT LLC21,038$164
Brevan Howard Capital Management LP21,033$164
MetLife Investment Management, LLC19,956$155
State of Wyoming19,249$150
Quantbot Technologies LP19,241$150
Virtu Financial LLC19,235$0
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.19,152$149
Mraz, Amerine & Associates, Inc.18,950$147
Verition Fund Management LLC17,500$136
Quarry LP15,103$118
STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM12,630$98
MANUFACTURERS LIFE INSURANCE COMPANY, THE12,594$98
nVerses Capital, LLC12,181$95
FRANKLIN RESOURCES INC11,959$93
Police & Firemen's Retirement System of New Jersey11,825$92
Cerity Partners LLC11,332$88
Voleon Capital Management LP11,204$87
Crown Wealth Group, LLC11,162$87
44 other institutions107,516$772
Total (144 institutions)34,704,270$265,052