U.S. well operators

25,561 canonical operators resolved from raw state filings (1,232,530 wellbores). Every operator has a portfolio page: wells by state, active vs. plugged mix, and per-well cross-links.

Dataset updated July 2026 . Derived from public data sources.

Largest operators

100 largest U.S. oil & gas well operators by catalogued wells
#	Operator	Wells	Active	Plugged	States
1	Chevron USA	62,502	13,703	41,676	CA CO ND NM OK WY
2	Aera Energy	57,642	12,536	35,647	CA
3	Hilcorp Energy	17,905	16,309	982	CO NM WY
4	Eog Resources	13,865	2,340	3,760	CA CO ND NM OK WY
5	Noble Energy	11,727	1,814	6,202	CA CO NM OK WY
6	California Resources Elk Hills	11,372	4,728	3,634	CA
7	Kerr Mcgee Oil & Gas Onshore	11,123	2,963	5,708	CO ND NM OK WY
8	California Resources Production	10,496	3,115	5,092	CA
9	Sentinel Peak Resources California	10,055	4,671	4,811	CA
10	Tep Rocky Mountain	9,983	7,602	175	CO
11	Citation Oil & Gas	9,513	7,099	1,138	CO ND NM OK WY
12	Pdc Energy	9,434	2,680	3,795	CO
13	Berry Petroleum	9,384	3,137	3,572	CA CO OK WY
14	Devon Energy Production	8,682	2,842	1,713	ND NM OK WY
15	Carbon Creek Energy	7,667	1,058	1,751	WY
16	Qb Energy Operating	6,677	4,378	398	CO
17	Merit Energy	5,765	3,349	417	CA CO ND NM OK WY
18	E & B Natural Resources Management	5,385	2,027	1,002	CA WY
19	Diversified Production	5,182	5,076	63	OK
20	Mewbourne Oil	5,175	2,039	372	NM OK
21	Oxy USA	5,061	1,656	2,018	CA CO ND NM OK WY
22	Continental Resources	5,033	2,951	817	CO ND NM OK WY
23	Contango Resources	4,938	1,513	685	NM OK WY
24	Anadarko E&p Onshore	4,810	123	2,036	CO ND WY
25	Xto Energy	4,225	2,094	1,067	CO ND NM OK WY
26	Simcoe	4,184	3,930	96	CO NM
27	Bp America Production	3,999	5	3,336	CO NM OK WY
28	Own Resources Operating	3,934	3,689	169	CO
29	Marathon Oil	3,619	547	2,017	CA CO ND NM OK WY
30	Fdl Operating	3,509	4	2,358	NM OK WY
31	Calnrg Operating	3,387	2,005	816	CA
32	Chesapeake Operating	3,350	334	2,095	CO ND NM OK WY
33	Coterra Energy Operating	3,120	1,138	285	NM OK
34	Cog Operating	2,935	758	763	NM
35	Bce Mach Iii	2,872	2,668	38	NM OK
36	Conocophillips	2,803	49	2,298	ND NM OK WY
37	Evergreen Natural Resources	2,781	2,006	225	CO
38	Bce Mach	2,689	2,536	34	OK
39	Crestone Peak Resources Operating	2,663	1,110	1,008	CO
40	Conoco	2,638	0	2,508	CA CO ND NM OK WY
41	Scout Energy Management	2,616	1,824	523	CO ND NM OK
42	Eog Y Resources	2,594	0	1,688	NM WY
43	Union Oil Company Of California	2,551	0	2,454	CA CO ND
44	Burlington Resources Oil & Gas	2,532	464	1,474	CO ND NM OK
45	Mack Energy	2,405	1,194	855	NM OK
46	Laramie Energy	2,405	1,693	142	CO
47	Tidelands Oil Production	2,310	741	1,694	CA
48	Shell Western E&p	2,283	0	1,604	CA ND
49	Permian Resources Operating	2,283	397	51	NM
50	Apache	2,219	511	1,339	CA CO ND NM OK WY
51	Matador Production	2,198	439	122	NM WY
52	Exxon Mobil	2,069	32	2,051	CA CO NM OK WY
53	Great Horned Owls	2,054	2,038	5	OK
54	Kaiser Francis Oil	2,051	698	718	CO ND NM OK WY
55	Holmes Western Oil	1,958	1,066	547	CA
56	Kp Kauffman	1,910	1,112	285	CO NM
57	Extraction Oil & Gas	1,836	707	556	CO
58	Xto Permian Operating	1,827	391	228	NM
59	Morningstar Operating	1,800	1,572	196	CO ND NM
60	Crimson Resource Management	1,786	993	678	CA
61	Davis Oil	1,662	0	1,861	CA CO ND WY
62	Mobil Oil	1,658	0	1,363	CA CO ND NM
63	Spur Energy Partners	1,649	1,118	151	NM
64	Abundance Energy Services	1,646	1,627	4	CO OK
65	Sandridge Exploration & Production	1,633	1,285	303	CO OK
66	Logos Operating	1,604	1,459	61	CO NM
67	Sep Legacy	1,585	1,560	21	NM
68	Storm Cat Energy USA Operating	1,564	0	1,605	WY
69	True Oil	1,549	149	1,139	CO ND WY
70	Jonah Energy	1,533	1,387	78	CO NM WY
71	Foundation Energy Management	1,506	1,085	382	CO ND NM OK
72	Trinity Operating Usg	1,502	1,447	26	OK
73	Samson Resources	1,498	0	735	CA CO ND NM OK WY
74	Dugan Production	1,482	907	544	CO NM
75	Encana Oil & Gas USA	1,462	0	137	CO ND
76	Greylock Production	1,459	605	64	WY
77	Magnolia Petroleum	1,448	3	1,116	OK
78	Hess Bakken Investments Ii	1,448	910	531	ND
79	Unbridled Resources	1,436	1,250	126	OK
80	High Plains Gas	1,427	0	1,324	WY
81	Crowheart Energy	1,424	878	466	CO WY
82	Whiting Oil And Gas	1,409	725	502	CA ND NM OK
83	Stephens & Johnson Operating	1,404	1,149	75	ND OK
84	Fw Midcon I	1,395	1,359	2	OK
85	Shell Oil	1,377	0	1,161	CA CO ND NM OK WY
86	M & K Oil	1,377	829	127	WY
87	Thums Long Beach	1,354	1,004	95	CA
88	Latigo Oil & Gas	1,351	1,188	124	OK
89	Oasis Petroleum North America	1,330	898	202	ND
90	Riley Permian Operating	1,312	956	66	NM
91	Bison Iv Operating	1,309	562	34	CO
92	Wexpro	1,307	579	413	CO WY
93	Bonanza Creek Energy Operating	1,305	506	361	CA CO
94	Southwest Royalties	1,302	1,092	180	NM
95	Atlantic Richfield	1,270	9	1,316	CA CO ND OK WY
96	Enduring Resources	1,270	1,048	41	CO NM
97	Phillips Petroleum	1,261	0	1,169	CA CO ND NM WY
98	High River Resources Operating	1,257	1,245	9	CO NM
99	Gateway Resources USA	1,244	1,140	47	OK
100	Patriot Energy Resources	1,199	0	807	WY

Looking for a specific operator? Search by name. State placeholder records (unassigned/orphan bookkeeping) are excluded — see methodology.