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.

Boost Run Inc.

CIK 0002090646BRUN· quarter ending 2026-06-30

Shares outstanding

79,487,441

as of 2026-08-17 · 10-Q cover page, filed 2026-08-18

Held by 13F filers

16,109,241

32.2% of Common Class A

Holders

+81 vs 2026-03-31 · 81 new, 0 exited

Value

$623.7M

shares +— vs prior quarter

Share classes (cover page of the 10-Q filed 2026-08-18, as of 2026-08-17)

Class	Listed	Shares outstanding	Held by 13F filers	% of class	Holders	CUSIP
Common Class A	BRUN · NASDAQ	49,954,423	16,109,241	32.2%	81	09940T100
Common Class B	not listed	29,533,018	—	—

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

Count	CUSIP	Class (as filers write it)	Holders	Shares held	Class shares	% of class	Value	Options	Mapped via
	09940T100	Stock	81	16,109,241	49,954,423	32.2%	$623.7M	9 call / 7 put	13DG	holders →
	09940T118	*W EXP 05/08/203not common	17	3,021,158	—	—	$82.3M	1 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 (81 of 81 · 09940T100)

change vs 2026-03-31

#	Filer	Shares	% of class	Value	Change
1	TOMS Capital Investment Management LP	3,125,000	6.26%	$121.3M	NEW
2	FMR LLC	1,782,250	3.57%	$69.2M	NEW
3	CITADEL ADVISORS LLC	1,320,722	2.64%	$51.3M	NEW
4	D. E. Shaw & Co., Inc.	1,250,546	2.50%	$48.5M	NEW
5	UBS Group AG	860,043	1.72%	$33.4M	NEW
6	AWM Investment Company, Inc.	813,739	1.63%	$31.6M	NEW
7	Capricorn Fund Managers Ltd	750,000	1.50%	$29.1M	NEW
8	Hiddenite Capital Partners LP	750,000	1.50%	$29.1M	NEW
9	WELLINGTON MANAGEMENT GROUP LLP	619,239	1.24%	$24.0M	NEW
10	Yorkville Advisors Global, LP	582,367	1.17%	$22.6M	NEW
11	MORGAN STANLEY	490,680	0.98%	$19.0M	NEW
12	Harraden Circle Investments, LLC	466,375	0.93%	$18.1M	NEW
13	SCOGGIN MANAGEMENT LP	342,500	0.69%	$13.3M	NEW
14	Magnetar Financial LLC	291,975	0.58%	$11.3M	NEW
15	BlackRock, Inc.	273,575	0.55%	$10.6M	NEW
16	Linden Advisors LP	191,707	0.38%	$6.7M	NEW
17	GEODE CAPITAL MANAGEMENT, LLC	157,105	0.31%	$6.1M	NEW
18	VANGUARD CAPITAL MANAGEMENT LLC	150,150	0.30%	$5.8M	NEW
19	Periscope Capital Inc.	127,988	0.26%	$4.3M	NEW
20	SUSQUEHANNA INTERNATIONAL GROUP, LLP	113,368	0.23%	$4.4M	NEW
21	MILLENNIUM MANAGEMENT LLC	110,357	0.22%	$4.3M	NEW
22	NEXT CENTURY GROWTH INVESTORS LLC	105,506	0.21%	$4.1M	NEW
23	FirstWave Capital Management LLC	88,631	0.18%	$3.4M	NEW
24	JANE STREET GROUP, LLC	83,488	0.17%	$3.2M	NEW
25	BARCLAYS PLC	82,512	0.17%	$3.2M	NEW
26	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	80,539	0.16%	$3.1M	NEW
27	VANGUARD FIDUCIARY TRUST CO	70,912	0.14%	$2.8M	NEW
28	BANK OF AMERICA CORP /DE/	65,790	0.13%	$2.6M	NEW
29	STATE STREET CORP	62,900	0.13%	$2.4M	NEW
30	CITIGROUP INC	62,688	0.13%	$2.4M	NEW
31	NOMURA HOLDINGS INC	60,869	0.12%	$2.4M	NEW
32	GROUP ONE TRADING LLC	53,418	0.11%	$2.1M	NEW
33	LPL Financial LLC	52,540	0.11%	$2.0M	NEW
34	Murchinson Ltd.	52,000	0.10%	$2.0M	NEW
35	XTX Topco Ltd	51,993	0.10%	$2.0M	NEW
36	BlueCrest Capital Management Ltd	50,000	0.10%	$1.9M	NEW
37	MOORE CAPITAL MANAGEMENT, LP	50,000	0.10%	$1.9M	NEW
38	Kestra Advisory Services, LLC	36,625	0.07%	$1.4M	NEW
39	IMC-Chicago, LLC	35,814	0.07%	$1.4M	NEW
40	WEXFORD CAPITAL LP	35,000	0.07%	$1.4M	NEW
41	NORTHERN TRUST CORP	29,733	0.06%	$1.2M	NEW
42	Galaxy Digital Capital Management GP LLC	28,209	0.06%	$1.1M	NEW
43	Cedar Wealth Management, LLC	26,878	0.05%	$1.0M	NEW
44	Feynman Point Asset Management LLC	26,700	0.05%	$1.0M	NEW
45	Fund 1 Investments, LLC	25,898	0.05%	$1.0M	NEW
46	GOLDMAN SACHS GROUP INC	23,915	0.05%	$928K	NEW
47	Alyeska Investment Group, L.P.	19,707	0.04%	$765K	NEW
48	Diametric Capital, LP	17,500	0.04%	$679K	NEW
49	SIMPLEX TRADING, LLC	15,183	0.03%	$589K	NEW
50	Panoramic Capital, LLC	15,000	0.03%	$582K	NEW
51	Concentric Capital Strategies, LP	14,686	0.03%	$570K	NEW
52	ROYAL BANK OF CANADA	13,150	0.03%	$510K	NEW
53	Kazazian Asset Management, LLC	13,044	0.03%	$506K	NEW
54	WINTON GROUP Ltd	10,600	0.02%	$411K	NEW
55	OPPENHEIMER & CO INC	8,500	0.02%	$330K	NEW
56	Harbour Capital Advisors, LLC	7,800	0.02%	$222K	NEW
57	Curi Capital, LLC	7,650	0.02%	$297K	NEW
58	PRELUDE CAPITAL MANAGEMENT, LLC	6,764	0.01%	$263K	NEW
59	MANGROVE PARTNERS IM, LLC	6,102	0.01%	$237K	NEW
60	Clearline Capital LP	5,960	0.01%	$231K	NEW
61	Accel Wealth Management	5,706	0.01%	$221K	NEW
62	BOOTHBAY FUND MANAGEMENT, LLC	5,200	0.01%	$202K	NEW
63	Vanguard Global Advisers, LLC	5,165	0.01%	$200K	NEW
64	Silicon Valley Capital Partners	2,870	0.01%	$111K	NEW
65	Activest Wealth Management	2,100	0.00%	$82K	NEW
66	Tower Research Capital LLC (TRC)	2,006	0.00%	$78K	NEW
67	Global Retirement Partners, LLC	2,000	0.00%	$78K	NEW
68	OSAIC HOLDINGS, INC.	1,800	0.00%	$70K	NEW
69	Rockefeller Capital Management L.P.	1,690	0.00%	$66K	NEW
70	Larson Financial Group LLC	1,400	0.00%	$54K	NEW
71	BNP PARIBAS FINANCIAL MARKETS	1,261	0.00%	$49K	NEW
72	WELLS FARGO & COMPANY/MN	1,150	0.00%	$45K	NEW
73	Persistent Asset Partners Ltd	1,079	0.00%	$42K	NEW
74	HIGHBRIDGE CAPITAL MANAGEMENT LLC	1,000	0.00%	$39K	NEW
75	Game Plan Financial Advisors, LLC	439	0.00%	$17K	NEW
76	Global Trust Asset Management, LLC	200	0.00%	$8K	NEW
77	MCF Advisors LLC	144	0.00%	$6K	NEW
78	WOLVERINE ASSET MANAGEMENT LLC	60	0.00%	$2K	NEW
79	FNY Investment Advisers, LLC	50	0.00%	$1K	NEW
80	Steward Partners Investment Advisory, LLC	30	0.00%	$1K	NEW
81	Friedenthal Financial	1	0.00%	$30	NEW

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
Sean Goodrich	SCHEDULE 13D/A	2026-09-16	2026-09-14	4,437,921	8.88%
Goodrich ILMJS LLC	SCHEDULE 13D/A	2026-09-16	2026-09-14	4,437,921	8.88%
TOMS Capital Investment Management LP	SCHEDULE 13G	2026-08-14	2026-06-30	3,125,000	9.8%
FMR LLC	SCHEDULE 13G	2026-08-06	2026-06-30	1,782,250	5.6%
Abigail P. Johnson	SCHEDULE 13G	2026-08-06	2026-06-30	1,782,250	5.6%
Willow Lane Sponsor, LLC	SCHEDULE 13D	2026-06-15	2026-05-12	2,038,632	6.39%
B. Luke Weil	SCHEDULE 13D	2026-06-15	2026-05-12	3,906,023	12.25%
Citadel Securities Group LP	SCHEDULE 13G	2026-05-21	2026-05-14	224,223	0.7%
Citadel Securities LLC	SCHEDULE 13G	2026-05-21	2026-05-14	224,223	0.7%
Citadel Securities GP LLC	SCHEDULE 13G	2026-05-21	2026-05-14	224,223	0.7%
Citadel GP LLC	SCHEDULE 13G	2026-05-21	2026-05-14	1,516,090	4.8%
Kenneth Griffin	SCHEDULE 13G	2026-05-21	2026-05-14	1,740,313	5.5%
Citadel Advisors LLC	SCHEDULE 13G	2026-05-21	2026-05-14	1,516,090	4.8%
Citadel Advisors Holdings LP	SCHEDULE 13G	2026-05-21	2026-05-14	1,516,090	4.8%
A23 Revocable Trust No.1, Dated January 26, 2026	SCHEDULE 13D	2026-05-15	2026-05-08	8,016,095	25.13%
Harilaos Georgakopoulos	SCHEDULE 13D	2026-05-15	2026-05-08	8,016,095	25.13%
Andrew Karos	SCHEDULE 13D	2026-05-15	2026-05-08	29,533,018	48.08%

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.