Institutional HoldersBeta

Who holds a company, from every 13F filed for the quarter, one row per filer exactly as filed, against the latest share count the company reported.

Bain Capital GSS Investment Corp.

CIK 0002064355BCSSBCSS-UNBCSS-WT· quarter ending 2026-06-30

Shares outstanding

58,400,000

as of 2026-08-11 · 10-Q cover page, filed 2026-08-13

Held by 13F filers

41,475,470

across share classes — see % per class below

Holders

-4 vs 2026-03-31 · 4 new, 8 exited

Value

$425.9M

shares +3.2% vs prior quarter

Share classes (cover page of the 10-Q filed 2026-08-13, as of 2026-08-11)

Class	Listed	Shares outstanding	Held by 13F filers	% of class	CUSIP
Class AOrdinary Shares	—	46,900,000	—	—
Common Class B	—	11,500,000	—	—
Not matched to a class			41,475,470	—	G0R78B106

Each class is compared with its own share count; classes are not added together. A class that is not exchange-listed cannot be held by 13F filers.

Securities (CUSIPs held in 13F this quarter)

tick to combine

CUSIP	Class (as filers write it)	Holders	Shares held	Class shares	% of class	Value	Options	Mapped via
G0R78B106	ORD CL A	59	41,475,470	—	—	$425.9M	2 call / 0 put	13DG	holders →
G0R78B122	COMnot common	14	2,334,089	—	—	$24.2M	—	13DG	holders →
G0R78B114	*W EXP 01/01/202not common	42	6,791,149	—	—	$5.2M	2 call / 0 put	prefix	holders →

Totals combine the ticked CUSIPs and update as you tick: common-stock classes by default; preferreds, notes, warrants and depositary shares are listed but not counted. "holders →" shows a single CUSIP on its own. Bonds are held as a principal amount, not shares. Options positions are never counted as holdings.

Top holders (59 of 59 · G0R78B106)

change vs 2026-03-31

#	Filer	Shares	% of class	Value	Change
1	Fort Baker Capital Management LP	4,248,685	—	$43.6M	+267,433 (+6.7%)
2	Empyrean Capital Partners, LP	3,990,000	—	$41.0M	—
3	ADAGE CAPITAL PARTNERS GP, L.L.C.	3,000,000	—	$30.8M	—
4	Sculptor Capital LP	1,723,855	—	$17.7M	—
5	Alberta Investment Management Corp	1,600,000	—	$16.4M	NEW
6	Mercuria Capital Strategies, LLC	1,545,878	—	$15.9M	—
7	MOORE CAPITAL MANAGEMENT, LP	1,500,000	—	$15.4M	—
8	J. Goldman & Co LP	1,481,156	—	$15.2M	+781,156 (+111.6%)
9	Davidson Kempner Capital Management LP	1,400,000	—	$14.4M	—
10	AQR Arbitrage LLC	1,184,099	—	$12.2M	+34,675 (+3.0%)
11	HighTower Advisors, LLC	1,081,073	—	$11.1M	-57,893 (-5.1%)
12	Polar Asset Management Partners Inc.	1,050,000	—	$10.8M	+50,000 (+5.0%)
13	LuminArx Capital Management LP	1,003,379	—	$10.3M	—
14	ARISTEIA CAPITAL, L.L.C.	1,000,000	—	$10.3M	—
15	Ghisallo Capital Management LLC	1,000,000	—	$10.3M	—
16	Meteora Capital, LLC	953,237	—	$9.8M	-145,057 (-13.2%)
17	MILLENNIUM MANAGEMENT LLC	857,600	—	$8.8M	-99,960 (-10.4%)
18	TWO SIGMA INVESTMENTS, LP	854,756	—	$8.8M	—
19	PICTON MAHONEY ASSET MANAGEMENT	700,000	—	$7.2M	—
20	HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND	700,000	—	$7.2M	—
21	Linden Advisors LP	600,000	—	$6.2M	—
22	Centiva Capital, LP	562,500	—	$5.8M	+300,000 (+114.3%)
23	UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	518,210	—	$5.3M	-28,041 (-5.1%)
24	Jain Global LLC	500,000	—	$5.1M	+250,000 (+100.0%)
25	BOUSSARD & GAVAUDAN GESTION SAS	500,000	—	$5.1M	NEW
26	Verition Fund Management LLC	472,950	—	$4.9M	-250 (-0.1%)
27	Saba Capital Management, L.P.	455,777	—	$4.7M	-79,803 (-14.9%)
28	Magnetar Financial LLC	450,000	—	$4.6M	—
29	Shaolin Capital Management LLC	430,650	—	$4.4M	-136,783 (-24.1%)
30	Periscope Capital Inc.	425,000	—	$4.4M	—
31	Radcliffe Capital Management, L.P.	412,365	—	$4.2M	+73,919 (+21.8%)
32	Lineage Point Capital LP	400,000	—	$4.1M	-70,000 (-14.9%)
33	BNP PARIBAS FINANCIAL MARKETS	359,100	—	$3.7M	—
34	TENOR CAPITAL MANAGEMENT Co., L.P.	350,000	—	$3.6M	—
35	GLAZER CAPITAL, LLC	334,580	—	$3.4M	-420 (-0.1%)
36	Hudson Bay Capital Management LP	310,521	—	$3.2M	—
37	Bulldog Investors, LLP	306,885	—	$3.2M	-1,356 (-0.4%)
38	DLD Asset Management, LP	300,000	—	$3.1M	+23,955 (+8.7%)
39	HIGHBRIDGE CAPITAL MANAGEMENT LLC	300,000	—	$3.1M	—
40	READYSTATE ASSET MANAGEMENT LP	257,900	—	$2.6M	+200,000 (+345.4%)
41	Schonfeld Strategic Advisors LLC	249,876	—	$2.6M	—
42	COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS	233,150	—	$2.4M	—
43	MIZUHO SECURITIES USA LLC	230,000	—	$2.3M	NEW
44	HBK INVESTMENTS L P	200,005	—	$2.1M	—
45	K2 PRINCIPAL FUND, L.P.	200,000	—	$2.1M	—
46	CITIGROUP INC	175,000	—	$1.8M	—
47	Context Capital Management, LLC	150,000	—	$1.5M	—
48	WOLVERINE ASSET MANAGEMENT LLC	150,000	—	$1.5M	NEW
49	First Trust Capital Management L.P.	149,995	—	$1.5M	—
50	BERKLEY W R CORP	149,955	—	$1.5M	—
51	Clear Street Group Inc.	138,933	—	$1.4M	-44,974 (-24.5%)
52	SONA ASSET MANAGEMENT (US) LLC	102,723	—	$1.1M	—
53	JPMORGAN CHASE & CO	55,075	—	$566K	—
54	Galaxy Digital Inc.	50,000	—	$514K	—
55	O'Connor Alternative Investments LLC	50,000	—	$514K	—
56	PenderFund Capital Management Ltd.	26,600	—	$273K	+16,600 (+166.0%)
57	STATE OF WISCONSIN INVESTMENT BOARD	24,000	—	$246K	—
58	Mint Tower Capital Management B.V.	20,000	—	$205K	—
59	TORONTO DOMINION BANK	2	—	$21	-24,565 (-100.0%)

Exited since 2026-03-31 (8 filers; largest 8 shown)

Decagon Asset Management LLP	−656,944
Lighthouse Investment Partners, LLC	−500,000
Boussard & Gavaudan Investment Management LLP	−500,000
CSS LLC/IL	−387,390
CANTOR FITZGERALD, L. P.	−297,361
Virtu Financial LLC	−98,464
JANE STREET GROUP, LLC	−24,810
HRT FINANCIAL LP	−20,953

Large holders from 13D/13G (latest per reporting person, last 2 years)

Filed when a holder crosses 5% or changes materially, so often more current than the quarter-end 13F. Percentages are the filer's own, against the share count they used.

Reporting person	Form	Filed	Event	Shares	% of class
Amos Meron	SCHEDULE 13G/A	2026-05-15	2026-03-31	4,340,641	9.26%
Empyrean Capital Partners, LP	SCHEDULE 13G/A	2026-05-15	2026-03-31	4,340,641	9.26%
Fort Baker Capital, LLC	SCHEDULE 13G/A	2026-05-15	2026-03-31	3,981,252	8.5%
Fort Baker Capital Management LP	SCHEDULE 13G/A	2026-05-15	2026-03-31	3,981,252	8.5%
Steven Patrick Pigott	SCHEDULE 13G/A	2026-05-15	2026-03-31	3,981,252	8.5%
Adage Capital Management, L.P.	SCHEDULE 13G	2026-02-12	2025-12-31	3,000,000	6.4%
Phillip Gross	SCHEDULE 13G	2026-02-12	2025-12-31	3,000,000	6.4%
Robert Atchinson	SCHEDULE 13G	2026-02-12	2025-12-31	3,000,000	6.4%
Bain Capital GSS Investment Sponsor LLC	SCHEDULE 13G	2025-10-15	2025-10-01	12,370,000	21.18%

Source: SEC Form 13F-HR information tables for the quarter ending 2026-06-30 (filed within 45 days of quarter end; amendments applied; values normalised to dollars), the share count from the company's latest 10-K/10-Q XBRL cover page, and Schedule 13D/13G filings. Each row is a legal 13F filer as filed — related entities (e.g. Vanguard's advisers) are not merged. Retail brokerage accounts are not reported on 13F, so the remainder is mostly retail and insiders.