Spindletop / Gladys City Unit Operators List — 2026

A Concentrated, Mature Operator Base

Spindletop / Gladys City Unit operators are predominantly long-tenured private operators running the modern Miocene waterflood. The original 1901-1925 cap-rock production has been depleted for nearly a century; modern production comes from the deeper Miocene flank reservoirs under continuous waterflood.

Notable Operators

Operators with current Spindletop / Gladys City Unit positions include long-tenured private waterflood operators and selective Texas Gulf Coast mature-asset operators:

Hilcorp Energy — large mature-asset focused operator with selected Texas Gulf Coast positions

Riley Exploration Permian — selected Texas Gulf Coast mature waterflood positions

Multiple long-tenured private operators — the Gladys City Unit framework consolidates ownership across multiple original 1900s-1920s tracts; current operating responsibilities are typically held by long-tenured private entities

Historic Operators

Spindletop's discovery directly birthed multiple major oil companies. While these original entities have all consolidated or been acquired, their successors include some of the largest names in U.S. oil and gas history:

Texaco (Texas Company, 1902) — now part of Chevron

Gulf Oil (1907) — now part of Chevron

Humble Oil (1911) — now part of ExxonMobil

Sun Oil — Sunoco's predecessor

Verifying Your Operator

The Texas Railroad Commission (RRC) maintains the authoritative public record of every Texas oil and gas operator. Look up your operator's permit history and any operator transfers to confirm the entity on your division order is the active operator. The Jefferson County clerk's office maintains the public record of mineral conveyances and lease assignments.

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