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Super Investors Yorktown Energy Partners VIII, L.P.
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Yorktown Energy Partners VIII, L.P.

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

Portfolio value
—
Positions
1
Quarter ended
June 30, 2025
Filed
August 14, 2025

Reported portfolio value by quarter (39 quarters reported)

$404M —
Q4 15 Q4 17 Q4 19 Q4 21 Q4 23 Q2 25

$254M in Q4 2015 → — now. Hover for any quarter.

Holdings

As reported for the quarter ended June 30, 2025. Activity is the change in share count since the prior quarter's filing.

Holding % of portfolio Activity Shares Value
N None NaN% New 0 —

Timeline of changes

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

Q2 2025

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

Company Action Shares changed Value of change % of portfolio
Antero Resources Corp Exited −1,100,000 −$44.5M —
RE Riley Exploration Permian In Exited −287,627 −$8.39M —
N None New +0 — —

Q1 2025

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

Company Action Shares changed Value of change % of portfolio
Antero Resources Corp Trimmed −900,000 −$36.4M 84.1%

Q4 2024

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

Company Action Shares changed Value of change % of portfolio
RE Riley Exploration Permian In Trimmed −287,627 −$9.18M 11.6%

Q3 2024

quarter ended September 30, 2024 · filed November 13, 2024

No position changes this quarter.

Q2 2024

quarter ended June 30, 2024 · filed August 13, 2024

Company Action Shares changed Value of change % of portfolio
Antero Resources Corp Trimmed −1,000,000 −$32.6M 80.0%
RE Riley Exploration Permian In Trimmed −500,000 −$14.2M 20.0%

Q1 2024

quarter ended March 31, 2024 · filed May 15, 2024

Company Action Shares changed Value of change % of portfolio
Antero Resources Corp Trimmed −1,000,000 −$29M 71.0%

Q4 2023

quarter ended December 31, 2023 · filed February 14, 2024

Company Action Shares changed Value of change % of portfolio
Southwestern Energy Co Exited −1,341,183 −$8.65M —

Q3 2023

quarter ended September 30, 2023 · filed November 14, 2023

Company Action Shares changed Value of change % of portfolio
RE Riley Exploration Permian In Exited −1,075,254 −$38.4M —
RE Riley Exploration Permian In New +1,075,254 +$34.2M 23.7%
Southwestern Energy Co Trimmed −1,341,183 −$8.65M 6.0%

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