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ONE Nuclear Energy Inc.

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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.

ONE Nuclear Energy Inc.

CIK 0001846416ONEN· quarter ending 2026-06-30
Shares outstanding
26,023,333
as of 2026-08-12 · 10-Q cover page, filed 2026-08-12
Held by 13F filers
15,669,432
selection includes debt or preferreds — no % of shares outstanding
Holders
40
+2 vs 2026-03-31 · 4 new, 2 exited
Value
$5.7M
shares -1.1% vs prior quarter

Share classes (cover page of the 10-Q filed 2026-08-12, as of 2026-08-12)

ClassListedShares outstandingHeld by 13F filers% of classHoldersCUSIP
Common Class AHVII · NASDAQ19,690,00019,080,03496.9%56G4405D107
Common Class Bnot listed6,333,333——

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
CountCUSIPClass (as filers write it)HoldersShares heldClass shares% of classValueOptionsMapped via
G4405D107COM5619,080,03419,690,00096.9%$199.3M—13DGholders →
G4405D115RIGHT 01/17/2030not common4015,657,432
$12K principal
——$5.7M—prefixholders →
G4405D123UNIT 99/99/9999not common289,243——$656K—13DGholders →

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. 1 further CUSIPs map to this company (mostly bonds) but no 13F filer held them this quarter.

Top holders (40 of 40 · G4405D115)

change vs 2026-03-31
#FilerShares / principal% of classValueChange
1TENOR CAPITAL MANAGEMENT Co., L.P.1,500,000—$584K—
2HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND1,500,000—$480K—
3Linden Advisors LP1,443,732—$510K—
4AQR Arbitrage LLC1,289,107—$413K+10,094 (+0.8%)
5D. E. Shaw & Co., Inc.850,000—$272K—
6Harraden Circle Investments, LLC825,362—$321K—
7Sculptor Capital LP700,000—$272K—
8Magnetar Financial LLC700,000—$247K—
9Wealthspring Capital LLC680,940—$265K-2,800 (-0.4%)
10Verition Fund Management LLC600,985—$234K-7,905 (-1.3%)
11Polar Asset Management Partners Inc.500,000—$195K—
12LMR Partners LLP450,000—$175K—
13BNP PARIBAS FINANCIAL MARKETS444,056—$173K—
14RIVERNORTH CAPITAL MANAGEMENT, LLC399,487—$108K—
15Shaolin Capital Management LLC371,779—$145K-78,221 (-17.4%)
16Clear Street Group Inc.334,632—$130K-49,218 (-12.8%)
17MOORE CAPITAL MANAGEMENT, LP300,000—$117K—
18TORONTO DOMINION BANK214,585—$83K+5,154 (+2.5%)
19K2 PRINCIPAL FUND, L.P.211,027—$82K-98,150 (-31.7%)
20WHITEBOX ADVISORS LLC200,000—$78K—
21Centiva Capital, LP200,000—$78KNEW
22PICTON MAHONEY ASSET MANAGEMENT200,000—$78K—
23GRITSTONE ASSET MANAGEMENT LLC197,900—$77K—
24Periscope Capital Inc.193,740—$75K-27,433 (-12.4%)
25Meteora Capital, LLC189,800—$74K—
26Context Capital Management, LLC187,500—$73K—
27Saba Capital Management, L.P.175,000—$62K—
28DLD Asset Management, LP156,484—$61K—
29Walleye Capital LLC149,884—$58K—
30Parallax Volatility Advisers, L.P.125,698—$44K+500 (+0.4%)
31BERKLEY W R CORP94,950—$34K-153,600 (-61.8%)
32Lineage Point Capital LP74,000—$29KNEW
33MYDA Advisors LLC60,000—$23K—
34READYSTATE ASSET MANAGEMENT LP48,331—$19K—
35GLAZER CAPITAL, LLC29,750—$12K—
36Curi Capital, LLC27,560—$11K—
37CONDOR CAPITAL MANAGEMENT13,650—$5K—
38SUSQUEHANNA INTERNATIONAL GROUP, LLP12,843—$5K-12,715 (-49.7%)
39ROBINSON CAPITAL MANAGEMENT, LLC12,000—$4KNEW
40Arax Advisory Partners4,650—$2KNEW
Exited since 2026-03-31 (2 filers; largest 2 shown)
Schonfeld Strategic Advisors LLC−29,199
T3 Companies, LLC−19,700

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 personFormFiledEventShares% of class
Walter V. ArnoldSCHEDULE 13D2026-09-302026-09-234,987,1034.6%
NCCS GP, LLCSCHEDULE 13D2026-09-302026-09-234,987,1034.6%
NCCS Management, LLCSCHEDULE 13D2026-09-302026-09-234,987,1034.6%
New Circle Capital Solutions LPSCHEDULE 13D2026-09-302026-09-234,987,1034.6%
Osman H. AhmedSCHEDULE 13D2026-09-302026-09-234,987,1034.6%
Paul J. GlazerSCHEDULE 13G2026-08-132026-06-30999,9935.08%
Glazer Capital, LLCSCHEDULE 13G2026-08-132026-06-30999,9935.08%
W. R. Berkley CorporationSCHEDULE 13G2026-08-062026-06-301,101,4735.6%
Berkley Insurance CompanySCHEDULE 13G2026-08-062026-06-301,101,4735.6%
Verbena Value LPSCHEDULE 13G2026-06-052025-12-311,222,7406.21%
Aaron DiamondSCHEDULE 13G2026-06-052025-12-311,222,7406.21%
Shaolin Capital Partners SP, a segregated portfolio of PW MAP SPCSCHEDULE 13G/A2026-05-142026-03-3158,1000.3%
MAP 214 Segregated Portfolio, a segregated portfolio of LMA SPCSCHEDULE 13G/A2026-05-142026-03-3158,1000.3%
North Rock Capital Management, LLCSCHEDULE 13G2026-05-142026-03-311,222,7406.21%
Lighthouse Investment Partners, LLCSCHEDULE 13G2026-05-142026-03-311,222,7406.21%
Eagle Harbor Multi-Strategy Master Fund LimitedSCHEDULE 13G/A2026-05-142026-03-3158,1000.3%
MAP 204 Segregated Portfolio, a segregated portfolio of LMA SPCSCHEDULE 13G/A2026-05-142026-03-3158,1000.3%
NR1 SP, a segregated portfolio of North Rock SPCSCHEDULE 13G2026-02-172025-12-311,280,8406.74%
Highbridge Capital Management, LLCSCHEDULE 13G2026-02-172025-12-311,500,0007.6%
Steven Patrick PigottSCHEDULE 13G/A2026-02-172025-12-31963,9224.9%
Fort Baker Capital Management LPSCHEDULE 13G/A2026-02-172025-12-31963,9224.9%
Fort Baker Capital, LLCSCHEDULE 13G/A2026-02-172025-12-31963,9224.9%
Linden GP LLCSCHEDULE 13G/A2026-02-122025-12-311,394,6347.1%
Linden Capital L.P.SCHEDULE 13G/A2026-02-122025-12-311,394,6347.1%
Linden Advisors LPSCHEDULE 13G/A2026-02-122025-12-311,463,7327.4%
AQR Arbitrage, LLCSCHEDULE 13G/A2026-02-122025-12-311,059,5895.38%
AQR Capital Management Holdings, LLCSCHEDULE 13G/A2026-02-122025-12-311,059,5895.38%
AQR Capital Management, LLCSCHEDULE 13G/A2026-02-122025-12-311,059,5895.38%
Siu Min WongSCHEDULE 13G/A2026-02-122025-12-311,463,7327.4%
K2 Genpar 2017 Inc.SCHEDULE 13G/A2026-02-052025-12-3153,4420.2%
K2 & Associates Investment Management Inc.SCHEDULE 13G/A2026-02-052025-12-3153,4420.2%
The K2 Principal Fund, L.P.SCHEDULE 13G/A2026-02-052025-12-3153,4420.2%
SHAWN KIMEL INVESTMENTS, INC.SCHEDULE 13G/A2026-02-052025-12-3153,4420.2%
Meteora Capital, LLCSCHEDULE 13G/A2025-12-052025-11-30232,6231.18%
Healthcare of Ontario Pension Plan Trust FundSCHEDULE 13G/A2025-08-132025-06-30200,0001%
HC VII Sponsor LLCSCHEDULE 13G2025-05-152025-03-315,703,33322.9%
Hennessy Capital Group LLCSCHEDULE 13G2025-05-152025-03-315,703,33322.9%
HENNESSY DANIEL JSCHEDULE 13G2025-05-152025-03-315,703,33322.9%
Hennessy Thomas DSCHEDULE 13G2025-05-152025-03-316,453,33325.2%
Tenor Capital Management Company, L.P.SCHEDULE 13G2025-01-242025-01-171,500,0008.6%
Tenor Opportunity Master Fund, Ltd.SCHEDULE 13G2025-01-242025-01-171,500,0008.6%
Robin ShahSCHEDULE 13G2025-01-242025-01-171,500,0008.6%

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.