Lime Rock Resources
Lime Rock Resources is a Houston-based, privately-held upstream oil and gas company founded in 2005 that acquires, operates, and improves lower-risk oil and gas properties in the United States. It was acquired by Ring Energy, Inc. in 2025.
- Company typePrivate
- Founded2005
- HeadquartersHouston, United States
- Headcount51–100
- GTM typeB2B
- OfferingServices
What Lime Rock Resources does
Lime Rock Resources is a privately-held, Houston-based upstream oil and gas company founded in 2005 that acquires, operates, and improves lower-risk oil and gas properties in the United States. The firm operated with a lean organizational footprint of 51–100 employees and was led by energy-sector veterans, including Chairman and CEO Eric D. Mullins, Co-Founder and Vice Chairman Charlie Adcock, and President and Chief Operating Officer Tim Miller. Its commercial focus was on lower-risk hydrocarbon property acquisition, exploration, and production, with revenue mechanics derived from the sale of produced oil and gas rather than from any disclosed pricing or subscription model.
In 2025, Lime Rock Resources was acquired by Ring Energy, Inc., an event that contributed a 14% increase in Ring Energy's proved reserves (to 153.3 MMBoe) and supported Ring's record $50.1 million in Adjusted Free Cash Flow for the period. The acquisition was framed by Ring Energy as part of a strategic transformation from vertical to horizontal drilling operations, signaling a reorientation of the combined asset base toward a more capital-intensive development model. Following the deal, Eric D. Mullins joined Ring Energy's board and was separately appointed to the TechnipFMC board as an independent director; Lime Rock Resources ceased to operate as an independent entity upon closing. No technology stack, product surface, or AI/ML capability is disclosed in the source material, consistent with a conventional upstream operating model.
Lime Rock Resources firmographics
Firmographics- Name
- Lime Rock Resources
- Website
- https://limerockresources.com
- Company type
- Private
- Founded year
- 2005
- Operating status
- Acquired
- Headcount range
- 51–100 employees
- Short description
- Lime Rock Resources is a Houston-based, privately-held upstream oil and gas company founded in 2005 that acquires, operates, and improves lower-risk oil and gas properties in the United States. It was acquired by Ring Energy, Inc. in 2025.
- Ownership category
- akta.pro rank
Lime Rock Resources industry classification
Industry- Product category
- Oil and Gas Exploration and Production
- NAICS
- Natural Gas Extraction (211130), Natural Gas Extraction (21113)
- SIC
- Oil & Gas Field Exploration Services (1382)
- akta.pro primary industry
- Field Development & EOR/IOR for Gas (Compression, Refracturing, Reservoir Management) (EUAAAAAM)
Keywords
Where Lime Rock Resources is headquartered
LocationHeadquarters
- HQ city
- Houston
- HQ country
- United States
- HQ region
- North America
Markets served
Lime Rock Resources business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Operations, Supply Chain, Personnel, Infrastructure, Marketing or Sales
Lime Rock Resources product offering
Product offeringCore offering
Lime Rock Resources acquires, operates, and improves lower-risk oil and gas properties in the United States. Founded in 2005 and headquartered in Houston, the company focuses on upstream hydrocarbon exploration and production across domestic assets. Following its 2025 acquisition by Ring Energy, Inc., Lime Rock Resources continues to contribute to its parent company's reserve base and production portfolio.
Differentiator
Problem solved
Functional benefit
Products and services
- Oil and Gas Property Acquisition and Operations
- Hydrocarbon Reserve Development
Companies that use Lime Rock Resources
Customer profileSegments1 record
Ideal customer profiles1 record
Lime Rock Resources technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Lime Rock Resources partnerships and signals
Strategic signalPartnerships
One partnership is on record.
- Ring Energy, Inc.coreRing Energy, Inc. acquired Lime Rock Resources in 2025. This acquisition contributed to Ring Energy's 14% growth in proved reserves to 153.3 MMBoe. The acquisition was part of Ring Energy's strategic transformation from vertical to horizontal drilling operations.
Recent moves5 records
Expansion highlights3 records
Lime Rock Resources competitors and assessment
Company assessmentMarket position
Weaknesses4 records
Competitive moat3 records
Key risks4 records
Key highlights4 records
Customer concentration
Lime Rock Resources social profiles
Digital presenceLime Rock Resources financial estimates
Financial estimateRevenue estimate
Valuation estimate
Lime Rock Resources leadership team
Management profileNumber of profiles
Profiles3 records
Lime Rock Resources funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Lime Rock Resources M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Lime Rock Resources
What does Lime Rock Resources do?
Lime Rock Resources acquires, operates, and improves lower-risk oil and gas properties in the United States. Founded in 2005 and headquartered in Houston, the company focuses on upstream hydrocarbon exploration and production across domestic assets. Following its 2025 acquisition by Ring Energy, Inc., Lime Rock Resources continues to contribute to its parent company's reserve base and production portfolio.
Is Lime Rock Resources a public or private company?
Lime Rock Resources is a private company. It is classified as corporate owned and is currently acquired.
When was Lime Rock Resources founded?
Lime Rock Resources was founded in 2005. It employs 51 to 100 people.
Where is Lime Rock Resources based?
Lime Rock Resources is headquartered in Houston, United States, in the North America region.
Does Lime Rock Resources have an API?
No public API is recorded for Lime Rock Resources.
What industry is Lime Rock Resources in?
Lime Rock Resources's product category is Oil and Gas Exploration and Production. Its primary akta.pro industry code is EUAAAAAM, Field Development & EOR/IOR for Gas (Compression, Refracturing, Reservoir Management). Its NAICS code is 211130 and its SIC code is 1382.