L3VLUP
ProSign in

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 Mar 2024
the date the book describes
Filed
15 May 2024
latest of these filings; the earliest 14 May 2024
Managers listing it
3
at least, of 95 tracked, among listed positions
Comparable managers
93
filed both Q4 2023 and Q1 2024; 3 listed it in both
Shares listed
190,378
combined, among listed positions
Reported value
$3.0m
combined, at the quarter end

Among the 93 comparable managers: 2 buyers (opened or added shares) and 1 seller (trimmed or exited), at least, among listed positions. Their net change in shares was +11,274.

Managers listing OSG in Q1 2024

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q4 2023, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

3 of 3 holders

ActionFiling
Winton Group Ltd105,272$1.6m0.12%Added+15,54014 May 2024 (the filing on sec.gov)
PDT Partners LLC62,314$974k0.09%Added+39,14515 May 2024 (the filing on sec.gov)
Caxton Associates LLP22,792$356kunder 0.1%Trimmed-43,41115 May 2024 (the filing on sec.gov)

Largest increases and reductions, by shares

Q4 2023 to Q1 2024, 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 (0)

No new position among listed positions.

Exited (0)

No exit shown by a manager’s own filing.

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 →