Yorktown Energy Partners VIII, L.P. reported RILEY EXPLORATION PERMIAN IN (REPX) in 8 quarterly 13F filings from 2024 Q1 through 2025 Q2. Peak portfolio weight reached 28.97% in 2024 Q1. The latest visible filing shows REPX at 15.87% of the fund.
This page tracks quarterly shares, estimated market value, portfolio weight, filing dates, and disclosure-aligned stock prices directly from SEC EDGAR 13F filings. Older history is available after unlock; the visible window still shows the most recent pattern.
This page is designed to answer the real investor question behind a 13F filing: how meaningful was Yorktown Energy Partners VIII, L.P.'s position in RILEY EXPLORATION PERMIAN IN, and how did that conviction change over time? You can read the holding window, peak weight, latest reported size, disclosure timing, and quarter-by-quarter changes without piecing the story together from raw SEC rows.
REPX was reported at 15.87% of portfolio in the most recent visible filing.
Peak weight helps separate a token disclosure from a real conviction holding the fund genuinely cared about.
Longer holding windows often tell a very different story from short-lived tactical trades or one-quarter experiments.
Knowing that a fund owned a stock is useful. Knowing whether it was a 0.20% placeholder or a true high-conviction position is where the signal actually starts.
As of 2026 Q2 — sorted by position size
These are the practical questions this page is built to answer before you even open the full history table.
Yorktown Energy Partners VIII, L.P. reported REPX across 6 quarterly 13F filings, from 2024 Q1 through 2025 Q2.
The largest reported portfolio weight for REPX was 28.97% in 2024 Q1.
The most recent filing on this page is 2025 Q2, when Yorktown Energy Partners VIII, L.P. reported 287,627 shares, equal to 15.87% of portfolio, with an estimated market value of $8.4M.
The chart compares Yorktown Energy Partners VIII, L.P.'s quarterly REPX portfolio weight with the stock's indexed share price, so you can see whether the fund was building, trimming, or holding the position as price moved.
Based on 13F filing dates vs. subsequent REPX price moves, Yorktown Energy Partners VIII, L.P. correctly timed 1 out of 3 reported position changes (33%). The annualised alpha on REPX relative to SPY over the holding period was -14.8%.