OSG · Octave Specialty Group Inc · Shareholders & Ownership

$4.68 -0.05 (-0.95%)

Russell 2000 member Rebalance outlook locked

Market Cap

$212.64M

45.05M

Volume · Oct 23 16.86K Avg daily vol (3M) 487.01K

Every disclosed holder of OSG in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.

How the holder list picks a filing →

Who Owns OSG

13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions

Holder group	Holders	Shares	% Out	Summed
Institutional (13F)	143	29,490,499	65.46%	Yes
Insiders (Forms 3, 4, 5)	14	2,730,801	6.06%	Yes
13D/G-only blocks	1	3,017,400	6.70%	Yes
Remaining	—	9,812,786	21.78%	Rest
Registered funds (N-PORT, not summed)	144	9,238,420	20.51%	No

Shares outstanding: 45,051,486, the issuer's latest cover-page count restated onto today's split basis.

13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.

Holders of OSG

One row per holder Every filing By ultimate parent

All 13F Funds Insiders 13D/G Non-US

#	Holder	Shares	% Out	Change	As of	Notes
1	BlackRock, Inc. 13F CIK 2012383 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	4,572,516	10.15%	+654,718	Jun 30, 2026	carried, not yet filed for the newest quarter
1.1	iShares Russell 2000 ETF Fund S000004344 · Registered fund · Jun 30, 2026 iShares Trust, not summed	1,086,913	2.41%	+109,056	Jun 30, 2026	iShares Trust, not summed
1.2	iShares Russell 2000 Value ETF Fund S000004342 · Registered fund · Jun 30, 2026 iShares Trust, not summed	371,718	0.83%	+30,965	Jun 30, 2026	iShares Trust, not summed
1.3	BlackRock Advantage Small Cap Core Fund Fund S000039982 · Registered fund · May 29, 2026 BlackRock Funds, not summed	212,173	0.47%	-2,800	May 29, 2026	BlackRock Funds, not summed
1.4	iShares Micro-Cap ETF Fund S000004439 · Registered fund · Jun 30, 2026 iShares Trust, not summed	138,862	0.31%	+40,963	Jun 30, 2026	iShares Trust, not summed
1.5	iShares Core S&P Total U.S. Stock Market ETF Fund S000004317 · Registered fund · Jun 30, 2026 iShares Trust, not summed	90,730	0.20%	+2,176	Jun 30, 2026	iShares Trust, not summed
2	Theodore Walker Cheng-De King 13G CIK 1773585 · Unknown · Apr 2, 2024 Rule 13d-1(c), passive investor	3,017,400	6.70%	—	Apr 2, 2024	Rule 13d-1(c), passive investor
3	Western Standard LLC 13F CIK 1517666 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	2,247,591	4.99%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
4	VANGUARD CAPITAL MANAGEMENT LLC 13F CIK 2100119 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,972,619	4.38%	+27,543	Jun 30, 2026	carried, not yet filed for the newest quarter
4.1	VANGUARD CAPITAL MANAGEMENT LLC 13G CIK 2100119 · Registered investment adviser · Jun 30, 2026 Rule 13d-1(b), qualified institution, not summed	2,269,979	5.04%	—	Jun 30, 2026	Rule 13d-1(b), qualified institution, not summed
5	Prescott Group Capital Management, L.L.C. 13F CIK 1166152 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,647,793	3.66%	+55,206	Jun 30, 2026	carried, not yet filed for the newest quarter
6	VANGUARD TOTAL STOCK MARKET INDEX FUND Fund S000002848 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	1,384,276	3.07%	0	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
7	THIRD AVENUE MANAGEMENT LLC 13F CIK 1099281 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,341,879	2.98%	+668	Jun 30, 2026	carried, not yet filed for the newest quarter
7.1	Third Avenue Small-Cap Value Fund Fund S000001465 · Registered fund · Jul 31, 2026 Third Avenue Trust, not summed	1,338,765	2.97%	0	Jul 31, 2026	Third Avenue Trust, not summed
8	Bain Capital Credit, LP 13F CIK 1317947 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,108,012	2.46%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
9	GEODE CAPITAL MANAGEMENT, LLC 13F CIK 1214717 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,106,335	2.46%	+83,897	Jun 30, 2026	carried, not yet filed for the newest quarter
10	LeBlanc Claude Insider CIK 1380820 · Oct 3, 2026 Director, Chief Executive Officer, issuer-wide	1,072,032	2.38%	+6,798	Oct 3, 2026	Director, Chief Executive Officer, issuer-wide
11	STATE STREET CORP 13F CIK 93751 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	898,673	1.99%	-42,731	Jun 30, 2026	carried, not yet filed for the newest quarter
11.1	STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO Fund S000050332 · Registered fund · Jun 30, 2026 STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed	14,294	0.03%	0	Jun 30, 2026	STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
11.2	State Street Total Return V.I.S. Fund Fund S000001637 · Registered fund · Jun 30, 2026 STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed	1,163	0.00%	+2	Jun 30, 2026	STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed
11.3	State Street Balanced Index Fund Fund S000082802 · Registered fund · Jun 30, 2026 STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed	300	0.00%	0	Jun 30, 2026	STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
12	DIMENSIONAL FUND ADVISORS LP 13F CIK 354204 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	716,947	1.59%	-593,185	Jun 30, 2026	carried, not yet filed for the newest quarter
12.1	Dimensional U.S. Core Equity 2 ETF Fund S000070903 · Registered fund · Jul 31, 2026 Dimensional ETF Trust, not summed	119,300	0.26%	+17,300	Jul 31, 2026	Dimensional ETF Trust, not summed
12.2	U.S. MICRO CAP PORTFOLIO Fund S000000948 · Registered fund · Jul 31, 2026 DFA INVESTMENT DIMENSIONS GROUP INC, not summed	89,535	0.20%	+29,542	Jul 31, 2026	DFA INVESTMENT DIMENSIONS GROUP INC, not summed
12.3	Dimensional U.S. Small Cap ETF Fund S000070906 · Registered fund · Jul 31, 2026 Dimensional ETF Trust, not summed	22,190	0.05%	-134,624	Jul 31, 2026	Dimensional ETF Trust, not summed
12.4	U.S. CORE EQUITY 2 PORTFOLIO Fund S000000980 · Registered fund · Jul 31, 2026 DFA INVESTMENT DIMENSIONS GROUP INC, not summed	21,378	0.05%	-30,613	Jul 31, 2026	DFA INVESTMENT DIMENSIONS GROUP INC, not summed
12.5	U.S. SMALL CAP PORTFOLIO Fund S000000971 · Registered fund · Jul 31, 2026 DFA INVESTMENT DIMENSIONS GROUP INC, not summed	18,059	0.04%	-158,684	Jul 31, 2026	DFA INVESTMENT DIMENSIONS GROUP INC, not summed
13	JACOBS LEVY EQUITY MANAGEMENT, INC 13F CIK 884414 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	649,530	1.44%	-234,742	Jun 30, 2026	carried, not yet filed for the newest quarter
14	MARSHALL WACE, LLP 13F CIK 1318757 · Exempt reporting adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	601,796	1.34%	-463,539	Jun 30, 2026	carried, not yet filed for the newest quarter
15	ZACKS INVESTMENT MANAGEMENT 13F CIK 1086483 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	590,370	1.31%	+590,370	Jun 30, 2026	carried, not yet filed for the newest quarter
16	Bracebridge Capital, LLC 13F CIK 1426486 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	579,234	1.29%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
17	MORGAN STANLEY 13F CIK 895421 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	569,563	1.26%	+334,317	Jun 30, 2026	carried, not yet filed for the newest quarter
18	GOLDMAN SACHS GROUP INC 13F CIK 886982 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	560,756	1.24%	+214,463	Jun 30, 2026	carried, not yet filed for the newest quarter
18.1	Goldman Sachs Small Cap Value Insights Fund Fund S000014929 · Registered fund · Jul 31, 2026 Goldman Sachs Trust, not summed	112,253	0.25%	+65,718	Jul 31, 2026	Goldman Sachs Trust, not summed
18.2	Goldman Sachs Absolute Return Tracker Fund Fund S000020314 · Registered fund · Jun 30, 2026 GOLDMAN SACHS TRUST, not summed	12,386	0.03%	+8,793	Jun 30, 2026	GOLDMAN SACHS TRUST, not summed
18.3	Goldman Sachs Small Cap Equity Insights Fund Fund S000009329 · Registered fund · Jul 31, 2026 Goldman Sachs Trust, not summed	12,114	0.03%	—	Jul 31, 2026	Goldman Sachs Trust, not summed
18.4	Goldman Sachs Variable Insurance Trust Small Cap Equity Insights Fund Fund S000009355 · Registered fund · Jun 30, 2026 Goldman Sachs Variable Insurance Trust, not summed	3,480	0.01%	-13,459	Jun 30, 2026	Goldman Sachs Variable Insurance Trust, not summed
19	RIHO Partners, LLC 13F CIK 2112884 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	554,818	1.23%	+8,249	Jun 30, 2026	carried, not yet filed for the newest quarter
20	VANGUARD EXTENDED MARKET INDEX FUND Fund S000002841 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	541,554	1.20%	+42,872	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
21	GENDELL JEFFREY L 13F CIK 1056581 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	494,092	1.10%	-919,120	Jun 30, 2026	carried, not yet filed for the newest quarter
22	Wolf Hill Capital Management, LP 13F CIK 1785988 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	480,187	1.07%	-990,147	Jun 30, 2026	carried, not yet filed for the newest quarter
23	Nuveen, LLC 13F CIK 1871926 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	428,165	0.95%	-372,088	Jun 30, 2026	carried, not yet filed for the newest quarter
23.1	College Retirement Equities Fund - Total Global Stock Account Fund S000005080 · Registered fund · Jun 30, 2026 College Retirement Equities Fund, not summed	284,923	0.63%	-454,230	Jun 30, 2026	College Retirement Equities Fund, not summed
23.2	Nuveen Small Cap Blend Index Fund Fund S000005367 · Registered fund · Jul 31, 2026 TIAA-CREF Funds, not summed	54,555	0.12%	+5,939	Jul 31, 2026	TIAA-CREF Funds, not summed
23.3	Nuveen Equity Index Fund Fund S000005360 · Registered fund · Jul 31, 2026 TIAA-CREF Funds, not summed	54,015	0.12%	0	Jul 31, 2026	TIAA-CREF Funds, not summed
23.4	TIAA Separate Account VA-1 - Stock Index Account Fund S000005098 · Registered fund · Jun 30, 2026 TIAA Separate Account VA-1, not summed	1,747	0.00%	0	Jun 30, 2026	TIAA Separate Account VA-1, not summed
23.5	Nuveen Life Stock Index Fund Fund S000005094 · Registered fund · Jun 30, 2026 TIAA-CREF Life Funds, not summed	699	0.00%	0	Jun 30, 2026	TIAA-CREF Life Funds, not summed
24	CITADEL ADVISORS LLC 13F CIK 1423053 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	422,777	0.94%	-9,032	Jun 30, 2026	carried, not yet filed for the newest quarter
25	Caption Management, LLC 13F CIK 1706766 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	419,136	0.93%	-223,461	Jun 30, 2026	carried, not yet filed for the newest quarter
26	VANGUARD PORTFOLIO MANAGEMENT LLC 13F CIK 2100121 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	392,350	0.87%	+96,450	Jun 30, 2026	carried, not yet filed for the newest quarter
27	CHARLES SCHWAB INVESTMENT MANAGEMENT INC 13F CIK 884546 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	377,869	0.84%	+82,525	Jun 30, 2026	carried, not yet filed for the newest quarter
27.1	Schwab U.S. Small-Cap ETF Fund S000026636 · Registered fund · May 31, 2026 SCHWAB STRATEGIC TRUST, not summed	207,921	0.46%	-3,270	May 31, 2026	SCHWAB STRATEGIC TRUST, not summed
27.2	Schwab Small-Cap Index Fund Fund S000005912 · Registered fund · Jul 31, 2026 SCHWAB CAPITAL TRUST, not summed	100,675	0.22%	+17,047	Jul 31, 2026	SCHWAB CAPITAL TRUST, not summed
27.3	Schwab Total Stock Market Index Fund Fund S000005913 · Registered fund · Jul 31, 2026 SCHWAB CAPITAL TRUST, not summed	49,456	0.11%	+23,086	Jul 31, 2026	SCHWAB CAPITAL TRUST, not summed
27.4	Schwab U.S. Broad Market ETF Fund S000026631 · Registered fund · May 31, 2026 SCHWAB STRATEGIC TRUST, not summed	20,000	0.04%	-3,471	May 31, 2026	SCHWAB STRATEGIC TRUST, not summed
28	NORTHERN TRUST CORP 13F CIK 73124 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	352,680	0.78%	+30,332	Jun 30, 2026	carried, not yet filed for the newest quarter
28.1	Small Cap Index Fund Fund S000001245 · Registered fund · Jun 30, 2026 Northern Funds, not summed	18,996	0.04%	+3,426	Jun 30, 2026	Northern Funds, not summed
28.2	Small Cap Core Fund Fund S000001244 · Registered fund · Jun 30, 2026 Northern Funds, not summed	4,001	0.01%	-171	Jun 30, 2026	Northern Funds, not summed
29	IPG Investment Advisors LLC 13F CIK 1602237 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	303,930	0.67%	-21,686	Jun 30, 2026	carried, not yet filed for the newest quarter
30	Connor, Clark & Lunn Investment Management Ltd. 13F CIK 1596800 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	302,913	0.67%	+158,612	Jun 30, 2026	carried, not yet filed for the newest quarter
31	VANGUARD FIDUCIARY TRUST CO 13F CIK 933478 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	295,841	0.66%	+21,279	Jun 30, 2026	carried, not yet filed for the newest quarter
32	AYAL Capital Advisors Ltd 13F CIK 2011524 · Exempt reporting adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	280,000	0.62%	+280,000	Jun 30, 2026	carried, not yet filed for the newest quarter
33	JANE STREET GROUP, LLC 13F CIK 1595888 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	278,731	0.62%	-485,653	Jun 30, 2026	carried, not yet filed for the newest quarter
34	Trick David Insider CIK 1480597 · Oct 3, 2026 Exec VP, CFO & Treasurer, issuer-wide	267,096	0.59%	0	Oct 3, 2026	Exec VP, CFO & Treasurer, issuer-wide
35	RAYMOND JAMES FINANCIAL INC 13F CIK 720005 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	239,680	0.53%	+214,024	Jun 30, 2026	carried, not yet filed for the newest quarter
36	AQR CAPITAL MANAGEMENT LLC 13F CIK 1167557 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	229,890	0.51%	+180,062	Jun 30, 2026	carried, not yet filed for the newest quarter
36.1	AQR Small Cap Multi-Style Fund Fund S000040064 · Registered fund · Jun 30, 2026 AQR Funds, not summed	2,017	0.00%	—	Jun 30, 2026	AQR Funds, not summed
37	PRUDENTIAL FINANCIAL INC 13F CIK 1137774 · Insurance company · Jun 30, 2026 carried, not yet filed for the newest quarter	226,010	0.50%	+155,900	Jun 30, 2026	carried, not yet filed for the newest quarter
38	Stein Jeffrey Scott Insider CIK 1559518 · Sep 29, 2025 Director, issuer-wide	217,807	0.48%	+167,807	Sep 29, 2025	Director, issuer-wide
39	TUDOR INVESTMENT CORP ET AL 13F CIK 923093 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	216,362	0.48%	+56,399	Jun 30, 2026	carried, not yet filed for the newest quarter
40	PRICE MICHAEL D Insider CIK 1241508 · Sep 29, 2025 Director, issuer-wide	205,477	0.46%	+39,179	Sep 29, 2025	Director, issuer-wide
41	Ksenak Stephen Michael Insider CIK 1527850 · Sep 29, 2025 Sr. MD & General Counsel, issuer-wide	205,256	0.46%	+83,657	Sep 29, 2025	Sr. MD & General Counsel, issuer-wide
42	VANGUARD RUSSELL 2000 INDEX FUND Fund S000030003 · Registered fund · May 31, 2026 VANGUARD SCOTTSDALE FUNDS, not summed	200,397	0.44%	-3,501	May 31, 2026	VANGUARD SCOTTSDALE FUNDS, not summed
43	Harbor Advisors LLC 13F CIK 1687156 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	196,382	0.44%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
44	Russell Investments Group, Ltd. 13F CIK 1692234 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	195,046	0.43%	+13,775	Jun 30, 2026	carried, not yet filed for the newest quarter
44.1	U.S. Small Cap Equity Fund Fund S000001586 · Registered fund · Jul 31, 2026 RUSSELL INVESTMENT CO, not summed	65,828	0.15%	+45,931	Jul 31, 2026	RUSSELL INVESTMENT CO, not summed
44.2	U.S. Small Cap Equity Fund Fund S000006864 · Registered fund · Jun 30, 2026 RUSSELL INVESTMENT FUNDS, not summed	3,999	0.01%	-856	Jun 30, 2026	RUSSELL INVESTMENT FUNDS, not summed
45	Quantinno Capital Management LP 13F CIK 1759654 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	190,283	0.42%	+141,583	Jun 30, 2026	carried, not yet filed for the newest quarter
46	Legato Capital Management LLC 13F CIK 1442641 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	181,037	0.40%	+50,277	Jun 30, 2026	carried, not yet filed for the newest quarter
47	1290 Essex Small Cap Growth Fund Fund S000076802 · Registered fund · Jul 31, 2026 1290 Funds, not summed	179,522	0.40%	+81,752	Jul 31, 2026	1290 Funds, not summed
48	Smith R Sharon Insider CIK 1707461 · Oct 3, 2026 Exec VP & Group COO, issuer-wide	156,326	0.35%	0	Oct 3, 2026	Exec VP & Group COO, issuer-wide
49	UBS Group AG 13F CIK 1610520 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	147,197	0.33%	-117,083	Jun 30, 2026	carried, not yet filed for the newest quarter
50	GSA CAPITAL PARTNERS LLP 13F CIK 1362033 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	143,566	0.32%	+143,566	Jun 30, 2026	carried, not yet filed for the newest quarter

15 more nested rows are not shown here; Every filing lists them all.

Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.

Showing 1–50 of 236 holders

Create a free account to page through every holder, filter by source and group by ultimate parent.

Key facts CIK 874501 CUSIP 023139884 13F (30d) 15 filings 15 filers Visit website Investor relations