Greylock Opco
Operator of record for 508 catalogued wells across 2 states. Every well below links to its full registry page.
Filed as: GREYLOCK OPCO LLC · GREYLOCK OPCO, LLC
At a glance
Greylock Opco is the operator of record for 508 catalogued U.S. oil & gas wells in 2 states. 501 (99%) are active, 2 (0.4%) plugged & abandoned and 5 flagged as orphaned. Its largest concentration is in West Virginia, with 401 wells (79% of its portfolio).
Wells operated
508
Active
501
Plugged
2
Orphaned
5
Portfolio by state
| State | Wells |
|---|---|
| West Virginia | 401 |
| Pennsylvania | 107 |
Well mix
- Oil wells
- 0
- Gas wells
- 508
- Shut-in
- 0
- Active share
- 99%
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Claim Greylock Opco to keep this portfolio accurate — verified operators can correct well statuses and add plugging documentation.
Claim your operator profileWhere does Greylock Opco operate?
Greylock Opco's catalogued wells are spread across 2 states: West Virginia (401) and Pennsylvania (107). Its 401 West Virginia wells are 0.3% of the 118,569 catalogued in that state — its largest share of any state. Counts cover only states whose registries WellCensus has ingested with operator names; wells in Nebraska and Texas (location indexes) and in states without a registry ingest are not yet attributed to any operator.
How many of Greylock Opco’s wells are active, plugged or orphaned?
99% of Greylock Opco's catalogued wells are active, 70 percentage points above the national share of 29%. 0.4% are plugged & abandoned, against 47% nationally. 5 wells filed under this name are flagged as orphaned — unplugged, with no operator able to plug them.
What kinds of wells does Greylock Opco operate?
By product class, 0 (0%) are oil wells and 508 (100%) gas wells; nationally the shares are 43% and 17%. The wells listed below sit in Indiana (PA) and Clearfield (PA). State filings spell the name 2 ways; WellCensus merges exact-normalized spellings only, so subsidiaries and affiliates keep their own pages.
Notable wells operated by Greylock Opco
| Well | API # / state ID | Status | Type | Location | Operator | Depth |
|---|---|---|---|---|---|---|
| Edward B. Carnahan 2 | 37-063-30006 | Active | Gas | Indiana, PA | Greylock Opco LLC | — |
| Duane Witherow 2 | 37-033-24785 | Active | Gas | Clearfield, PA | Greylock Opco LLC | — |
| M Thompson 5 | 37-033-24803 | Active | Gas | Clearfield, PA | Greylock Opco LLC | — |
| Swistock 4 | 37-033-24748 | Active | Gas | Clearfield, PA | Greylock Opco LLC | — |
| Cathaleene Johnston 2 | 37-033-23986 | Active | Gas | Clearfield, PA | Greylock Opco LLC | — |
| Norris 3 | 37-033-25006 | Active | Gas | Clearfield, PA | Greylock Opco LLC | — |
| E B Wright 6 | 37-063-33122 | Active | Gas | Indiana, PA | Greylock Opco LLC | — |
| Iraca 1 | 37-033-24726 | Active | Gas | Clearfield, PA | Greylock Opco LLC | — |
| Stein Unit 3 | 37-033-24839 | Active | Gas | Clearfield, PA | Greylock Opco LLC | — |
| J O Clark 2 | 37-063-33176 | Active | Gas | Indiana, PA | Greylock Opco LLC | — |
| E B Wright 5 | 37-063-32953 | Active | Gas | Indiana, PA | Greylock Opco LLC | — |
| Shannon Land & Mining Co 6 | 37-033-24862 | Active | Gas | Clearfield, PA | Greylock Opco LLC | — |
Deepest first where depth is published. See all 508 wells →
Frequently asked questions
How many wells does Greylock Opco operate?
Greylock Opco is the operator of record for 508 catalogued oil & gas wells, with the largest concentration in West Virginia (401). Only wells in states WellCensus has ingested are counted.
How many of Greylock Opco's wells are still active?
501 of Greylock Opco's catalogued wells are active; 2 are plugged & abandoned and 5 are flagged as orphaned.
In which states does Greylock Opco operate wells?
Greylock Opco is the operator of record for wells in West Virginia (401) and Pennsylvania (107).
Does Greylock Opco operate mostly oil or gas wells?
0 of Greylock Opco's catalogued wells are oil wells and 508 are gas wells; the rest are injection, service or unclassified wells.
Where Greylock Opco's wells are
About this data
Source: State oil & gas regulator registries (operator of record as filed, exact-normalized across states) plus the USGS United States Documented Orphaned Well Database (2026), as published October 10, 2026 — WellCensus refreshes it monthly. See the methodology for how records are matched, cleaned and scored.
Cite as: WellCensus, “Greylock Opco — well portfolio”, https://wellcensus.com/operators/greylock-opco-104393 (data as of October 10, 2026).
Dataset updated . Operator portfolios are resolved from raw state registry filings (exact-normalized names; subsidiaries stay separate).