Stocks/Funds/CIK 1577919

Yorktown Energy Partners X, L.P.

microcap filerlong-term holderconcentrated
Quarterly 13F filings · Latest period 2026-03-31 · CIK 1577919
Assets
$69M
+72.6% YoY
Holdings
4
Lifetime alpha vs market
-15.16% annual
Average hold time
2.8 yr
median 3.0 yr

Quarterly history

Cum return -21% vs S&P +52% · α -73% lifetimeAUM $69M · peak $572MFlow $-36M (-47%)2016-122018-062019-122021-062022-122024-062025-122026-03
AUM ($B)fundS&P 500(gap = α)/ Flow in/out

Behavior signals (lifetime)

Dip response
+0.00%
trims when stocks drop
when a holding falls −10%+
Middle response
+0.00%
baseline attrition
Rally response
+0.00%
adds into rallies
when a holding rises +10%+

Top positions · 4

Ticker$ value% portYoYHold time
$30M43.8%3.0 yr
EPSNEpsilon Energy Ltd.$16M23.5%-9.0%0.5 yr
REPXRiley Exploration Permia$14M20.5%+32.4%4.8 yr
METCBRamaco Resources, Inc.$8M12.1%3.0 yr

Portfolio composition (YoY)

Industry mix
Oil & Gas Exploration & Production44.0%+15.7pp$31M
Unknown43.8%-16.1pp$30M
Coal12.1%+0.3pp$8M
Country
US56.2%+16.1pp
Unknown43.8%-16.1pp
Top 5: 100.0% · Top 10: 100.0% · Top 25: 100.0%

Winners

TickerPrev $PnLYoY %
REPX$11M+0.00B32.4%

Losers

TickerPrev $PnLYoY %

Top buys this quarter · 0

No buys this quarter

Top sells this quarter · 2

METCB Ramaco Resources, Inc.$0M
$0M

Quarterly history (TTM returns)

PeriodAUM# PosReturn (1yr)SPY (1yr)Alpha (1yr)Flow
2026-03-31$69M4+26.46%+17.59%+8.87%-0.04B
2025-12-31$77M4-14.68%+17.72%-32.40%-0.03B
2025-09-30$107M3+7.91%+17.52%-9.61%+0.05B
2025-06-30$55M3-2.45%+14.94%-17.39%+0.02B
2025-03-31$40M3-7.09%+8.30%-15.39%-0.01B
2024-12-31$52M3+23.85%+24.89%-1.04%-0.02B
2024-09-30$55M3-12.14%+36.04%-48.17%-0.00B
2024-06-30$59M3-16.69%+24.49%-41.19%-0.02B
2024-03-31$86M4-6.64%+29.62%-36.27%-0.01B
2023-12-31$80M4-17.45%+26.18%-43.62%-0.04B
2023-09-30$134M5+1.77%+21.57%-19.80%+0.03B
2023-06-30$121M5-18.36%+19.42%-37.78%+0.02B
2023-03-31$104M4-28.14%-7.82%-20.32%-0.02B
2022-12-31$111M4+6.85%+7.56%-0.71%-0.00B
2022-09-30$105M3-27.92%-4.93%-22.99%+0.01B
2022-06-30$132M3-14.28%-16.11%+1.83%-0.14B