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OSG in the 13F filings

Ambac Financial Group Inc · CUSIP 023139884

Sector · InsuranceTheme · Financial services· L3VLUP-defined
Quarter
Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023Q3 2023Q2 2023Q1 2023
Quarter end
31 Dec 2025
the date the book describes
Filed
19 Feb 2026
latest of these filings; the earliest 10 Feb 2026
Managers listing it
23
at least, of 95 tracked, among listed positions
Comparable managers
92
filed both Q3 2025 and Q4 2025; 1 listed it in both
Shares listed
4,499,135
combined, among listed positions
Reported value
$35m
combined, at the quarter end

Among the 92 comparable managers: 10 buyers (opened or added shares) and 12 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was -1,105,990.

Managers listing OSG in Q4 2025

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q3 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

23 of 23 holders

ActionFiling
Jane Street Group LLC1,520,654$12munder 0.1%Added+671,47212 Feb 2026 (the filing on sec.gov)
Marshall Wace LLP748,572$5.8munder 0.1%Added+293,49813 Feb 2026 (the filing on sec.gov)
Susquehanna International Group LLP526,588$4.1munder 0.1%Added+252,27817 Feb 2026 (the filing on sec.gov)
Millennium Management LLC303,282$2.4munder 0.1%Trimmed-397,61317 Feb 2026 (the filing on sec.gov)
Citadel Advisors LLC287,283$2.2munder 0.1%Added+115,74017 Feb 2026 (the filing on sec.gov)
Schonfeld Strategic Advisors LLC169,824$1.3munder 0.1%Trimmed-378,61817 Feb 2026 (the filing on sec.gov)
Invesco Ltd156,504$1.2munder 0.1%Trimmed-7,57719 Feb 2026 (the filing on sec.gov)
ExodusPoint Capital Management LP109,765$854kunder 0.1%Added+95,60617 Feb 2026 (the filing on sec.gov)
Point72 Asset Management LP103,544$806kunder 0.1%Newnew17 Feb 2026 (the filing on sec.gov)
Walleye Capital LLC88,284$687kunder 0.1%Newnew13 Feb 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc70,941$552kunder 0.1%Held017 Feb 2026 (the filing on sec.gov)
AQR Capital Management LLC70,128$546kunder 0.1%Trimmed-12,43417 Feb 2026 (the filing on sec.gov)
Caxton Associates LLP65,647$511kunder 0.1%Held013 Feb 2026 (the filing on sec.gov)
Two Sigma Investments LP45,044$350kunder 0.1%Newnew17 Feb 2026 (the filing on sec.gov)
D. E. Shaw & Co.44,126$343kunder 0.1%Trimmed-74,59917 Feb 2026 (the filing on sec.gov)
Balyasny Asset Management LLC42,917$334kunder 0.1%Trimmed-38,30417 Feb 2026 (the filing on sec.gov)
AllianceBernstein LP37,530$292kunder 0.1%Held017 Feb 2026 (the filing on sec.gov)
Renaissance Technologies LLC25,158$196kunder 0.1%Trimmed-64,04212 Feb 2026 (the filing on sec.gov)
Acadian Asset Management LLC23,053$179kunder 0.1%Newnew10 Feb 2026 (the filing on sec.gov)
Brevan Howard Capital Management LP21,033$164kunder 0.1%Trimmed-14,45217 Feb 2026 (the filing on sec.gov)
Quantbot Technologies LP19,241$150kunder 0.1%Newnew10 Feb 2026 (the filing on sec.gov)
Verition Fund Management LLC17,500$136kunder 0.1%Trimmed-3,03313 Feb 2026 (the filing on sec.gov)
Fidelity (FMR LLC)2,517$20kunder 0.1%Trimmed-1,522,90617 Feb 2026 (the filing on sec.gov)

Largest increases and reductions, by shares

Q3 2025 to Q4 2025, among managers that listed it in both quarters or opened it.

Increases

Reductions

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (5)

Exited (2)

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.
3 in Q1 2024 to 1 in Q4 2025

Tracked managers listing it, at least.

01232015201620172019202320242025
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
OSG by quarter
QuarterHoldersReported valueBuyersSellers
Q2 20131$7.1mn.a.n.a.
Q3 20131$4.0mn.a.n.a.
Q4 20132$2.6mn.a.n.a.
Q3 20142$3.6mn.a.n.a.
Q4 20141$6.1mn.a.n.a.
Q1 20153$6.3mn.a.n.a.
Q2 20152$36mn.a.n.a.
Q3 20152$29mn.a.n.a.
Q4 20151$28mn.a.n.a.
Q1 20161$31mn.a.n.a.
Q2 20162$33mn.a.n.a.
Q3 20161$37mn.a.n.a.
Q4 20162$46mn.a.n.a.
Q1 20172$38mn.a.n.a.
Q2 20171$34mn.a.n.a.
Q3 20171$34mn.a.n.a.
Q4 20171$32mn.a.n.a.
Q2 20182$16mn.a.n.a.
Q3 20182$18mn.a.n.a.
Q4 20182$13mn.a.n.a.
Q1 20191$14mn.a.n.a.
Q3 20191$272kn.a.n.a.
Q4 20191$1.6mn.a.n.a.
Q2 20201$241kn.a.n.a.
Q4 20201$8.1mn.a.n.a.
Q2 20211$7.8mn.a.n.a.
Q3 20211$14mn.a.n.a.
Q4 20211$16mn.a.n.a.
Q2 20221$659kn.a.n.a.
Q3 20222$1.3mn.a.n.a.
Q4 20222$3.3mn.a.n.a.
Q1 20233$17mn.a.n.a.
Q2 20232$12mn.a.n.a.
Q3 20232$1.3mn.a.n.a.
Q4 20233$3.0m21
Q1 20243$3.0m21
Q2 20242$1.1m20
Q3 20242$1.2m20
Q4 20241$615k10
Q1 20251$574k10
Q2 20251$466k00
Q3 20251$547k00
Q4 20251$511k1012

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

OSG and V →OSG and AXP →OSG and BAC →Choose a stock to compare with OSG →

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own OSG, latest filings →Back to the 13F Explorer →