Login
Super Investors Yorktown Energy Partners X, L.P.
YE

Yorktown Energy Partners X, L.P.

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

Portfolio value
$47.6M
Positions
3
Quarter ended
June 30, 2026
Filed
August 14, 2026

Reported portfolio value by quarter (39 quarters reported)

$572M $17M
Q4 16 Q4 18 Q4 20 Q4 22 Q4 24 Q2 26

$352M in Q4 2016 → $47.6M 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
Ramaco Resources Inc 54.8% Unchanged 1,969,646 $26.1M
Epsilon Energy Ltd 30.2% Unchanged 2,656,705 $14.4M
Ramaco Resources Inc 15.0% Added 1.2% 836,511 $7.15M

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 14, 2026

Company Action Shares changed Value of change % of portfolio
Riley Exploration Permian Inc Exited −390,860 −$14.2M —
Ramaco Resources Inc Added +9,900 +$84.6K 15.0%

Q1 2026

quarter ended March 31, 2026 · filed May 15, 2026

Company Action Shares changed Value of change % of portfolio
Ramaco Resources Inc Trimmed −533,284 −$8.24M 43.8%
Ramaco Resources Inc Trimmed −1,265 −$12.9K 12.1%

Q4 2025

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

Company Action Shares changed Value of change % of portfolio
Epsilon Energy Ltd New +2,656,705 +$12.3M 15.9%
Ramaco Resources Inc Added +11,744 +$138K 12.6%

Q3 2025

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

Company Action Shares changed Value of change % of portfolio
Ramaco Resources Inc Trimmed −426,627 −$14.2M 77.3%
Ramaco Resources Inc Added +9,667 +$163K 12.8%

Q2 2025

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

Company Action Shares changed Value of change % of portfolio
Ramaco Resources Inc Added +137,742 +$1.13M 11.9%

Q1 2025

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

Company Action Shares changed Value of change % of portfolio
RR Ramaco Res Inc Trimmed −266,642 −$2.19M 59.9%
RR Ramaco Res Inc Trimmed −44,470 −$316K 11.8%

Q4 2024

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

No position changes this quarter.

Q3 2024

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

No position changes this quarter.

Create Account

Sign up for free to unlock this feature.

Already have an account? Sign in

Premium Feature

This feature requires a premium subscription to unlock unlimited historical data and advanced analysis tools.

Premium includes:

  • Unlimited historical financial data
  • Advanced analytics and insights
  • Priority support