Yorktown Energy Partners X, L.P.
CIK 1577919 · last filed 2024-12-18
Yorktown Energy Partners X, L.P. is a corporate insider who has filed 18 SEC Form 4 insider transactions across 5 companies since 2016. The most recent filing, for SEI, was dated May 8, 2026. Across all open-market trades the lifetime net is −$150.4M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $49.2M across reported positions.
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
$49.23M
5
18
-$150.37M
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| Solaris Energy Infrastructure, Inc. (SOI) Delisted | 10%+ Owner | 975,000 | $11.32 | $11.04M | -$135.66M | 6 | 2024-12-18 |
| REPX | 10%+ Owner | 390,860 | $32.98 | $12.89M | $0 | 2 | 2023-07-18 |
| Brigham Minerals, Inc. (MNRL) Delisted | 10%+ Owner | 2,683,371 | $32.50 | $87.21M | -$13.94M | 1 | 2019-12-18 |
| METC | 10%+ Owner | 3,726,959 | $9.75 | $36.34M | -$766.9K | 1 | 2017-02-10 |
| Extraction Oil & Gas, Inc. (XOG) Delisted | 10%+ Owner | 17,554,262 | $68.54 | $1.20B | $0 | 1 | 2016-10-31 |
Recent Filings
18 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-05-08 | SEI | Notice (144) | −2,000,000 | -$149.00M | EDGAR |
| 2026-03-24 | METC | Notice (144) | −49,928 | -$573.7K | EDGAR |
| 2026-03-05 | METC | Notice (144) | −533,284 | -$8.45M | EDGAR |
| 2025-03-20 | METC | Notice (144) | −266,642 | -$2.48M | EDGAR |
| 2025-03-20 | METC | Notice (144) | −49,604 | -$425.1K | EDGAR |
| 2024-12-18 | Solaris Energy Infrastructure, Inc. (SOI) Delisted | Mixed | −975,000 | -$23.41M | EDGAR |
| 2023-11-13 | METC | Notice (144) | −25,383 | -$412.5K | EDGAR |
| 2023-11-13 | METC | Notice (144) | −496,682 | -$9.09M | EDGAR |
| 2023-07-18 | REPX | Other (J) | −5,376,270 | $0 | EDGAR |
| 2021-07-30 | REPX | Mixed | — | $0 | EDGAR |
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.