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Super Investors / SEGRA CAPITAL MANAGEMENT, LLC
SC

SEGRA CAPITAL MANAGEMENT, LLC

Quarterly 13F snapshot: US-listed longs only, no performance figures — 13F data cannot support them.

Portfolio value
$496M
Positions
10
Quarter ended
June 30, 2026
Filed
August 12, 2026

Reported portfolio value by quarter (19 quarters reported)

$496M $66.2M
Q4 21 Q4 22 Q4 23 Q4 24 Q4 25 Q2 26

$66.2M in Q4 2021 → $496M now. Hover for any quarter.

Holdings

As reported for the quarter ended June 30, 2026. Activity is the change in share count since the prior quarter's filing.

Holding % of portfolio Activity Shares Value
X-energy Inc 53.6% New 14,475,734 $266M
Vistra Corp 9.5% Added 79% 295,956 $46.9M
Amentum Holdings Inc 8.5% Added 26% 2,037,890 $42.1M
Constellation Energy Corp 6.4% Added 4.1% 128,040 $31.8M
DE Duke Energy Corp New Put 6.4% New 250,000 $31.6M
Constellation Energy Corp Call 5.0% Trimmed 23% 100,000 $24.8M
Nrg Energy Inc 3.8% New 130,000 $19M
Flowserve Corp 3.3% New 222,600 $16.5M
TI Terra Innovatum Global Nv 2.6% Added 3.3% 2,617,152 $12.9M
Amentum Holdings Inc Call 0.8% Unchanged 200,000 $4.13M

Timeline of changes

What changed each quarter, from the filings' own share counts. Largest moves first; most recent 8 quarters.

Q2 2026

quarter ended June 30, 2026 · filed August 12, 2026

Company Action Shares changed Value of change % of portfolio
X-energy Inc New +14,475,734 +$266M 53.6%
DE Duke Energy Corp New New +250,000 +$31.6M 6.4%
Vistra Corp Exited −200,000 −$30.1M
Nexgen Energy Ltd Exited −2,000,000 −$23.2M
Ge Vernova Inc Exited −25,000 −$21.8M
Vistra Corp Added +130,956 +$20.8M 9.5%
Nrg Energy Inc New +130,000 +$19M 3.8%
Flowserve Corp New +222,600 +$16.5M 3.3%
Ge Vernova Inc Exited −15,000 −$13.1M
Amentum Holdings Inc Added +425,164 +$8.79M 8.5%

Showing the 10 largest of 15 changes.

Q1 2026

quarter ended March 31, 2026 · filed May 07, 2026

Company Action Shares changed Value of change % of portfolio
Vistra Corp Trimmed −1,791,518 −$269M 10.0%
GX Global X Fds Exited −2,207,100 −$94.3M
TI Terra Innovatum Global Nv Trimmed −10,717,753 −$49.7M 4.7%
Constellation Energy Corp New +130,000 +$36.3M 14.6%
Constellation Energy Corp New +123,000 +$34.3M 13.9%
Vistra Corp New +200,000 +$30.1M 12.1%
Amentum Holdings Inc Added +1,007,916 +$26.3M 17.0%
Nexgen Energy Ltd New +2,000,000 +$23.2M 9.4%
Ge Vernova Inc New +25,000 +$21.8M 8.8%
Ge Vernova Inc New +15,000 +$13.1M 5.3%

Showing the 10 largest of 14 changes.

Q4 2025

quarter ended December 31, 2025 · filed February 17, 2026

Company Action Shares changed Value of change % of portfolio
Vistra Corp Trimmed −26,261,623 −$4.24B 0.1%
Uranium Energy Corp Exited −2,164,800 −$28.9M
Nexgen Energy Ltd Trimmed −3,094,388 −$28.5M 1.1%
GX Global X Fds Trimmed −563,200 −$24.1M 66.8%
Ur-energy Inc New +13,252,093 +$18.4M 13.1%
TI Terra Innovatum Global Nv Added +1,955,518 +$9.03M 6.4%
Amentum Holdings Inc Added +187,785 +$5.45M 12.4%

Q3 2025

quarter ended September 30, 2025 · filed November 14, 2025

Company Action Shares changed Value of change % of portfolio
GX Global X Fds New +2,770,300 +$132M 53.4%
Nexgen Energy Ltd Trimmed −10,838,456 −$97M 11.8%
Denison Mines Corp Exited −33,901,398 −$61.7M
Cameco Corp Exited −700,000 −$52M
Cameco Corp Exited −635,000 −$47.1M
Bwx Technologies Inc Exited −250,000 −$36M
Uranium Energy Corp New +2,164,800 +$28.9M 11.7%
Uranium Energy Corp Exited −3,190,107 −$21.7M
Ur-energy Inc Trimmed −6,661,337 −$11.9M 19.0%
Encore Energy Corp Exited −3,770,728 −$10.8M

Showing the 10 largest of 11 changes.

Q2 2025

quarter ended June 30, 2025 · filed August 14, 2025

Company Action Shares changed Value of change % of portfolio
Cameco Corp Trimmed −500,000 −$37.1M 14.4%
Vistra Corp Exited −200,000 −$23.5M
Vistra Corp Trimmed −117,819 −$22.8M 0.1%
Cameco Corp Added +289,223 +$21.5M 13.0%
Constellation Energy Corporation Exited −100,000 −$20.2M
GX Global X Fds Exited −500,000 −$11.5M
Ge Vernova Inc Exited −32,201 −$9.83M
Denison Mines Corp Added +3,802,588 +$6.92M 17.0%
Nexgen Energy Ltd Exited −1,000,000 −$4.49M
Ur-energy Inc Added +3,872,618 +$4.07M 9.6%

Showing the 10 largest of 14 changes.

Q1 2025

quarter ended March 31, 2025 · filed May 15, 2025

Company Action Shares changed Value of change % of portfolio
Cameco Corp Added +700,800 +$28.8M 15.8%
Vistra Corp New +200,000 +$23.5M 7.5%
GX Global X Fds Trimmed −1,014,500 −$23.3M 3.7%
Constellation Energy Corporation New +100,000 +$20.2M 6.4%
Vistra Corp New +118,819 +$14M 4.5%
Nexgen Energy Ltd Added +3,024,726 +$13.6M 19.7%
Denison Mines Corp Added +9,043,089 +$11.8M 12.5%
Uranium Energy Corp Added +2,382,540 +$11.4M 5.4%
Bwx Technologies Inc Added +111,670 +$11M 7.4%
Ge Vernova Inc New +32,201 +$9.83M 3.1%

Showing the 10 largest of 14 changes.

Q4 2024

quarter ended December 31, 2024 · filed February 14, 2025

Company Action Shares changed Value of change % of portfolio
GX Global X Fds New +1,514,500 +$40.6M 15.4%
Cameco Corp Trimmed −560,537 −$28.8M 10.7%
Cameco Corp New +499,200 +$25.7M 9.7%
Uranium Energy Corp Trimmed −2,867,579 −$19.2M 3.0%
Constellation Energy Corp Exited −65,000 −$16.9M
Vistra Corp Exited −130,700 −$15.5M
Encore Energy Corp New +2,011,198 +$6.86M 2.6%
Nexgen Energy Ltd Trimmed −958,129 −$6.32M 26.8%
Denison Mines Corp Added +2,787,159 +$5.02M 14.4%
Ur-energy Inc Added +4,327,902 +$4.98M 11.0%

Showing the 10 largest of 12 changes.

Q3 2024

quarter ended September 30, 2024 · filed November 15, 2024

Company Action Shares changed Value of change % of portfolio
Cameco Corp New +1,109,997 +$53M 20.7%
Uranium Energy Corp New +4,036,529 +$24.9M 9.7%
Denison Mines Corp Added +10,140,540 +$18.6M 13.0%
Constellation Energy Corp New +65,000 +$16.9M 6.6%
Nexgen Energy Ltd Added +2,431,200 +$15.9M 29.7%
Vistra Corp New +130,700 +$15.5M 6.0%
Uranium Energy Corp Exited −2,230,000 −$13.4M
Ur-energy Inc Added +6,718,094 +$8.04M 9.8%
Nexgen Energy Ltd Exited −500,000 −$3.49M
Bwx Technologies Inc Added +14,750 +$1.6M 4.4%

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