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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
19,080,034
96.9% of Common Class A
Holders
56
+3 vs 2026-03-31 · 8 new, 5 exited
Value
$199.3M
shares +2.4% 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 (56 of 56 · G4405D107)

change vs 2026-03-31
#FilerShares% of classValueChange
1HIGHBRIDGE CAPITAL MANAGEMENT LLC1,690,4798.59%$17.6M+28,644 (+1.7%)
2TENOR CAPITAL MANAGEMENT Co., L.P.1,500,0007.62%$15.7M—
3Linden Advisors LP1,463,7327.43%$15.3M—
4Verbena Value LP1,222,7406.21%$12.8M—
5BERKLEY W R CORP1,101,4735.59%$11.5M+372,814 (+51.2%)
6AQR Arbitrage LLC1,011,7845.14%$10.6M-41,685 (-4.0%)
7GLAZER CAPITAL, LLC999,9935.08%$10.4M+300,084 (+42.9%)
8D. E. Shaw & Co., Inc.940,5004.78%$9.8M—
9Crossingbridge Advisors, LLC940,2224.78%$9.8M—
10MIZUHO SECURITIES USA LLC685,3453.48%$7.1M+421,750 (+160.0%)
11Magnetar Financial LLC665,0003.38%$6.9M—
12Radcliffe Capital Management, L.P.525,5442.67%$5.5M—
13RiverPark Advisors, LLC475,3222.41%$5.0M—
14RIVERNORTH CAPITAL MANAGEMENT, LLC398,6562.02%$4.2M-368 (-0.1%)
15GOLDMAN SACHS GROUP INC369,9951.88%$3.9M—
16Wealthspring Capital LLC353,5421.80%$3.7M+186,885 (+112.1%)
17LMR Partners LLP350,0001.78%$3.7M—
18Sculptor Capital LP347,6061.77%$3.6M—
19Meteora Capital, LLC300,0001.52%$3.1M—
20MOORE CAPITAL MANAGEMENT, LP300,0001.52%$3.1M—
21Qube Research & Technologies Ltd293,9511.49%$3.1M—
22TORONTO DOMINION BANK262,5021.33%$2.7M-87,498 (-25.0%)
23Clear Street Group Inc.247,0781.25%$2.6M+192,671 (+354.1%)
24SkyView Investment Advisors, LLC201,3201.02%$2.1MNEW
25WHITEBOX ADVISORS LLC200,0001.02%$2.1M—
26Brevan Howard Capital Management LP200,0001.02%$2.1M+120,000 (+150.0%)
27BANK OF AMERICA CORP /DE/200,0001.02%$2.1M—
28GRITSTONE ASSET MANAGEMENT LLC197,8991.01%$2.1M—
29CANTOR FITZGERALD, L. P.179,1800.91%$1.9M+89,590 (+100.0%)
30HRT FINANCIAL LP167,1450.85%$1.7M—
31PICTON MAHONEY ASSET MANAGEMENT150,0000.76%$1.6M—
32DLD Asset Management, LP146,6670.74%$1.5M—
33ARISTEIA CAPITAL, L.L.C.125,0000.63%$1.3M—
34Shaolin Capital Management LLC117,4650.60%$1.2M+17,465 (+17.5%)
35Periscope Capital Inc.100,0000.51%$1.0M-25,000 (-20.0%)
36MILLENNIUM MANAGEMENT LLC75,0000.38%$784K—
37Context Capital Management, LLC60,0000.30%$627K—
38HEIGHTS CAPITAL MANAGEMENT, INC60,0000.30%$627K—
39Cannon Global Investment Management, LLC58,4000.30%$610K+400 (+0.7%)
40WOLVERINE ASSET MANAGEMENT LLC56,6320.29%$592K-7,919 (-12.3%)
41CSS LLC/IL51,9000.26%$542K—
42Stoic Point Capital Management LLC50,0000.25%$504KNEW
43K2 PRINCIPAL FUND, L.P.46,9220.24%$490K—
44Parallax Volatility Advisers, L.P.37,3900.19%$391KNEW
45StoneX Group Inc.30,0000.15%$312KNEW
46Davidson Kempner Capital Management LP24,6000.12%$257K—
47GEODE CAPITAL MANAGEMENT, LLC22,2390.11%$232K-7,070 (-24.1%)
48Centiva Capital, LP15,9000.08%$166KNEW
49Shay Capital LLC14,1350.07%$148K—
50ROBINSON CAPITAL MANAGEMENT, LLC12,2500.06%$128KNEW
51CITADEL ADVISORS LLC10,6350.05%$111KNEW
52BARCLAYS PLC10,0000.05%$105K—
53Lineage Point Capital LP10,0000.05%$105K—
54Arax Advisory Partners2,6730.01%$28KNEW
55FNY Investment Advisers, LLC1,1600.01%$12K-4,000 (-77.5%)
56MORGAN STANLEY580.00%$606-17 (-22.7%)
Exited since 2026-03-31 (5 filers; largest 5 shown)
Aventail Capital Group, LP−1,452,081
Schonfeld Strategic Advisors LLC−13,714
Mirae Asset Global Investments Co., Ltd.−4,500
NATIONAL BANK OF CANADA /FI/−525
UBS Group AG−50

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.