174 hedge funds and large institutions have $325M invested in Ambac in 2025 Q1 according to their latest regulatory filings, with 35 funds opening new positions, 53 increasing their positions, 59 reducing their positions, and 38 closing their positions.

New
Increased
Maintained
Reduced
Closed
Holders
174
Holders Change
-6
Holders Change %
-3.33%
% of All Funds
2.36%
Holding in Top 10
4
Holding in Top 10 Change
+2
Holding in Top 10 Change %
+100%
% of All Funds
0.05%
New
35
Increased
53
Reduced
59
Closed
38
Calls
$84.6M
Puts
$8.99M
Net Calls
+$75.6M
Net Calls Change
+$23.5M
Name Holding Trade Value Shares
Change
Shares
Change %
D.E. Shaw & Co
26
D.E. Shaw & Co
New York
$3.6M -$172K -19,665 -5%
HF
27
HRT Financial
New York
$3.51M +$2.57M +293,715 +273%
Charles Schwab
28
Charles Schwab
California
$3.31M -$1.11M -126,362 -25%
TAM
29
Third Avenue Management
New York
$3.21M +$1.19M +136,045 +59%
CM
30
Caption Management
Oklahoma
$3.18M +$793K +90,605 +33%
Group One Trading
31
Group One Trading
Illinois
$2.99M +$2.85M +325,352 +2,019%
BCM
32
Bridgeway Capital Management
Texas
$2.67M +$118K +13,494 +5%
Walleye Trading
33
Walleye Trading
New York
$2.6M +$2.14M +245,046 +467%
NL
34
Nuveen LLC
North Carolina
$2.47M +$2.47M +282,657 New
Tudor Investment Corp
35
Tudor Investment Corp
Connecticut
$2.42M +$980K +111,961 +68%
Squarepoint
36
Squarepoint
New York
$2.03M +$976K +111,535 +92%
HSBC Holdings
37
HSBC Holdings
United Kingdom
$1.88M -$845K -96,847 -31%
Marshall Wace
38
Marshall Wace
United Kingdom
$1.8M -$538K -61,534 -23%
HA
39
Harbor Advisors
Florida
$1.72M
EF
40
Empowered Funds
Pennsylvania
$1.71M +$118K +13,494 +7%
Bank of America
41
Bank of America
North Carolina
$1.61M -$91.2K -10,423 -5%
Invesco
42
Invesco
Georgia
$1.58M -$1.71M -195,018 -52%
Renaissance Technologies
43
Renaissance Technologies
New York
$1.5M +$414K +47,300 +38%
CSS
44
Cubist Systematic Strategies
Connecticut
$1.49M +$1.11M +126,835 +290%
TI
45
Trexquant Investment
Connecticut
$1.41M +$1.41M +161,096 New
YIH
46
Y-Intercept (HK)
Hong Kong
$1.28M +$941K +107,596 +277%
Arrowstreet Capital
47
Arrowstreet Capital
Massachusetts
$1.28M -$186K -21,271 -13%
Bank of New York Mellon
48
Bank of New York Mellon
New York
$1.26M -$1.33M -152,146 -51%
UBS Group
49
UBS Group
Switzerland
$1.24M +$459K +52,403 +59%
Simplex Trading
50
Simplex Trading
Illinois
$1.14M +$1.14M +130,671 New