Comstock Fuels
Bioleum Corporation (formerly Comstock Fuels) selectively fractionates lignocellulosic biomass into cellulose, hemicellulose, and lignin to produce cellulosic ethanol, SAF, renewable diesel/gasoline, and bio-intermediates for B2B customers including petroleum refineries, ethanol plants, and pulp and paper mills.
- Company typePrivate
- Founded2025
- HeadquartersOklahoma City, United States
- Headcount11–50
- GTM typeB2B
- OfferingHardware or Manufacturing
What Comstock Fuels does
Comstock Fuels, now operating as Bioleum Corporation following its May 2025 spin-off from Comstock Inc., is a US-based lignocellulosic biomass conversion company headquartered in Oklahoma City. Its proprietary platform selectively fractionates sustainably sourced wood waste, forestry thinnings, agricultural residues, and purpose-grown energy crops into three high-purity streams — cellulose, hemicellulose, and lignin — rather than producing a single mixed slurry, which the company cites as the basis for low costs, industry-leading yields, and versatile downstream processing.
The platform produces five product lines: cellulosic ethanol, gasoline and diesel drop-in fuels, sustainable aviation fuel (SAF), bio-intermediates and blendstocks for petroleum refineries, and materials and specialty chemicals. Technology is anchored by two Wisconsin pilot facilities (Wausau for feedstock handling and fractionation, Madison for hydroprocessing) and by technology licenses from MIT and NREL for jet fuel production from lignin, supplemented by the December 2025 acquisition of RenFuel's intellectual property portfolio and Hexas Biomass (a purpose-grown energy crop company). Bioleum is advancing its first commercial-scale facility in Oklahoma City to demonstrate the technology at scale.
The business model is B2B and dual-track. Bioleum plans to generate revenue through both owned-and-operated commercial projects producing low-carbon fuel products for sale to industrial customers, and licensed solutions deployed with partners across biomass supply, industrial integration, and research. Target customer segments include petroleum refineries seeking refinery-ready HDO feedstocks, ethanol plants seeking to add cellulosic credit revenue, pulp and paper mills seeking to upgrade lignin by-products, and forestry and agriculture operations providing sustainable feedstock. Revenue is not publicly disclosed, and the company remains pre-commercial.
Comstock Fuels firmographics
Firmographics- Name
- Comstock Fuels
- Legal name
- Bioleum Corporation
- Website
- https://comstockfuels.com
- Company type
- Private
- Founded year
- 2025
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- Bioleum Corporation (formerly Comstock Fuels) selectively fractionates lignocellulosic biomass into cellulose, hemicellulose, and lignin to produce cellulosic ethanol, SAF, renewable diesel/gasoline, and bio-intermediates for B2B customers including petroleum refineries, ethanol plants, and pulp and paper mills.
- Ownership category
- akta.pro rank
Comstock Fuels industry classification
Industry- Product category
- Low-carbon Biofuels
- NAICS
- Ethyl Alcohol Manufacturing (325193), Petroleum Refineries (324110)
- SIC
- Petroleum Refining (2911)
- akta.pro primary industry
- Cellulosic Biofuels & Renewable Fuels (2G ethanol, SAF intermediates) (IMAMALAA)
- akta.pro secondary industries
- Biofuel Feedstock Preprocessing & Pretreatment (Milling, Fractionation, Hydrolysis) (EUAAAHAF), Biofuel Co-products & Byproduct Processing (DDGS, Glycerin, CO2, Lignin) (EUAAAHAJ), Biofuels & Renewable Fuels Switching (Biomethane/RNG, Bio-oils, Sustainable Biomass) (EUABAJAD), Biomass Fuel Feedstock Processing (Chipping, Grinding, Drying, Screening) (EUAAAJAD)
Keywords
Where Comstock Fuels is headquartered
LocationHeadquarters
- HQ city
- Oklahoma City
- HQ country
- United States
- HQ region
- North America
Offices3 records
Markets served
Comstock Fuels business model
Business model- GTM type
- B2B
- Offering type
- Hardware or Manufacturing
- Cost components
- Technology or R&D, Supply Chain, Infrastructure, Personnel, Operations
Revenue model
- Low-carbon Fuel Products: Sale of finished fuel products including cellulosic ethanol, sustainable aviation fuel, renewable diesel, and gasoline produced from lignocellulosic biomass.
Distribution channels2 records
Marketing channels3 records
Comstock Fuels product offering
Product offeringCore offering
Comstock Fuels (now operating as Bioleum Corporation) runs a proprietary lignocellulosic biomass fractionation platform that selectively separates sustainably sourced wood waste, forestry thinnings, agricultural residues, and purpose-grown energy crops into three high-purity streams (cellulose, hemicellulose, and lignin). These streams are converted into finished low-carbon fuels including cellulosic ethanol, renewable gasoline and diesel, sustainable aviation fuel (SAF), and refinery-ready bio-intermediates and blendstocks, as well as materials and specialty chemical feedstocks.
Product overview
Bioleum Corporation operates a proprietary lignocellulosic biomass conversion platform that selectively fractionates sustainably sourced feedstocks — including wood waste, forestry thinnings, agricultural residues, and purpose-grown energy crops (e.g., Hexas Biomass) — into three high-purity building blocks: cellulose, hemicellulose, and lignin. This controlled separation enables industry-leading yields and versatile downstream processing. The platform produces five integrated product lines: Cellulosic Ethanol, Gasoline & Diesel, Sustainable Aviation Fuel (SAF), Bio-intermediates & Blendstocks, and Materials & Specialty Chemicals. Bioleum's technology is anchored by two pilot facilities in Wisconsin (Wausau for fractionation and Madison for hydroprocessing) and is backed by technology licenses from MIT and NREL.
Differentiator
Problem solved
Functional benefit
Brands
- Cellulosic Ethanol: Sustainable ethanol produced from cellulosic feedstocks including wood waste, forestry thinnings, and agricultural residues.
- Gasoline & Diesel
- Sustainable Aviation Fuel
- Bio-intermediates & Blendstocks
- Materials & Specialty Chemicals
Products and services
- Cellulosic Ethanol Sustainable ethanol produced from cellulosic feedstocks (wood waste, forestry thinnings, agricultural residues) via Bioleum's selective biomass fractionation platform; qualifies under EPA Renewable Fuel Standard (RFS) pathways.
- Gasoline & Diesel Ultra-low-carbon transportation fuels (renewable gasoline and renewable diesel) that drop-in to existing fueling infrastructure without modification, delivering reduced carbon-intensity barrels.
- Sustainable Aviation Fuel (SAF) Renewable jet fuel derived from lignocellulosic biomass and lignin conversion, produced at the Madison, WI hydroprocessing pilot facility; meets aviation sustainability certification standards and supports carbon-neutral air travel.
- Bio-intermediates & Blendstocks High-value refinery-ready intermediates and blendstocks (including HDO feed) that integrate with existing petroleum refinery hydrotreaters, tanks, and docks to lower fleet carbon intensity and support RFS compliance.
- Materials & Specialty Chemicals High-performance materials and specialty chemical feedstocks derived from selectively fractionated biomass building blocks (cellulose, hemicellulose, and lignin), targeting non-fuel revenue streams from the biorefinery platform.
Quantifiable outcome
- Industry-leading yields through controlled separation of biomass into clean, high-purity streams
Companies that use Comstock Fuels
Customer profileSegments4 records
Ideal customer profiles4 records
Comstock Fuels technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature3 records
Comstock Fuels partnerships and signals
Strategic signalPartnerships
Four partnerships are on record, tiered core.
- Hexas BiomasscoreBioleum acquired Hexas Biomass, a company specializing in purpose-grown energy crops with ultra-high yields. Hexas crops are cultivated for fiber yield, resilience, and land revitalization, and are process-advantaged for Bioleum's platform, offering consistent quality and streamlined logistics.
- RenFuelcoreBioleum Corporation acquired RenFuel's intellectual property portfolio, enhancing its technology capabilities related to lignin conversion into fuels. This acquisition strengthens Bioleum's proprietary platform for producing low-carbon fuels from biomass.
- MITcoreBioleum holds a technology license from MIT enabling the company to produce jet fuel from lignin. MIT is a key research partner contributing to Bioleum's advanced biomass conversion technology.
- NREL (National Renewable Energy Laboratory)coreBioleum holds a technology license from NREL in conjunction with MIT, enabling jet fuel production from lignin. NREL provides research and analysis capabilities supporting Bioleum's technology development and scale-up efforts.
Scale indicators2 records
Recent moves8 records
Expansion highlights5 records
Comstock Fuels competitors and assessment
Company assessmentDirect peers
- Velocys: Velocys develops microchannel Fischer-Tropsch technology to convert biomass and waste feedstocks into SAF and renewable diesel. Direct competitor in the biomass-to-SAF pathway.
- Fulcrum BioEnergy: Fulcrum converts municipal solid waste into syngas and then into SAF via Fischer-Tropsch. Directly comparable as a feedstock-flexible, low-carbon jet fuel producer targeting aviation decarbonization.
- Ensyn: Ensyn converts forestry residues into pyrolysis bio-oil (RFO) for heating and refining applications. Comparable as a forest-residue-to-fuel producer using proprietary thermochemical conversion.
- Iogen: Iogen produces cellulosic ethanol and enzymes from agricultural residues using a proprietary biomass pretreatment platform. Direct peer in the 2G cellulosic ethanol and D3 RIN pathway.
- Gevo: Gevo produces renewable hydrocarbons including SAF, renewable diesel, and isobutanol/cellulosic ethanol from biomass feedstocks. Directly comparable to Bioleum in producing low-carbon fuels from lignocellulosic feedstocks for refinery and aviation customers.
- LanzaTech: LanzaTech uses gas fermentation to convert waste gases and biomass-derived syngas into ethanol, SAF, and chemicals. A direct peer pursuing SAF and low-carbon fuel production from non-fossil, sustainable feedstocks.
Emerging players
- Sunfire: Sunfire produces industrial e-fuels and synthetic hydrocarbons from biomass and renewable electricity via high-temperature electrolysis and Fischer-Tropsch. Adjacent peer targeting the same low-carbon fuel mandate markets.
Broad incumbents
- Aemetis: Aemetis produces renewable diesel and SAF from agricultural waste and purpose-grown oils at larger commercial scale. Operates in the same low-carbon fuel mandate-driven end-markets as Bioleum but at a more advanced commercial stage.
- POET-DSM Advanced Biofuels: POET-DSM operates Project Liberty, one of the largest cellulosic ethanol facilities, monetizing corn stover into ethanol and RINs. Comparable as a cellulosic ethanol producer serving refiners under RFS pathways.
Regional players
- UPM Biofuels: UPM Biofuels produces cellulosic renewable diesel and naphtha from crude tall oil and wood-based feedstocks in Finland. Comparable as a wood/biomass-to-renewable-fuels producer but with a primarily European footprint.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat4 records
Key risks5 records
Key highlights6 records
Customer concentration
Comstock Fuels social profiles
Digital presenceComstock Fuels financial estimates
Financial estimateRevenue estimate
Valuation estimate
Comstock Fuels leadership team
Management profileNumber of profiles
Comstock Fuels subsidiaries and ownership
Company hierarchySubsidiaries1 record
Comstock Fuels funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Comstock Fuels 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 Comstock Fuels
What does Comstock Fuels do?
Comstock Fuels (now operating as Bioleum Corporation) runs a proprietary lignocellulosic biomass fractionation platform that selectively separates sustainably sourced wood waste, forestry thinnings, agricultural residues, and purpose-grown energy crops into three high-purity streams (cellulose, hemicellulose, and lignin). These streams are converted into finished low-carbon fuels including cellulosic ethanol, renewable gasoline and diesel, sustainable aviation fuel (SAF), and refinery-ready bio-intermediates and blendstocks, as well as materials and specialty chemical feedstocks.
Is Comstock Fuels a public or private company?
Comstock Fuels is a private company. It is classified as venture growth investor backed and is currently operating.
When was Comstock Fuels founded?
Comstock Fuels was founded in 2025. It employs 11 to 50 people.
Where is Comstock Fuels based?
Comstock Fuels is headquartered in Oklahoma City, United States, in the North America region.
How does Comstock Fuels make money?
One revenue line is on record: low-carbon Fuel Products.
Who are Comstock Fuels's main competitors?
Direct peers on record are Velocys, Fulcrum BioEnergy, Ensyn, Iogen, Gevo and LanzaTech. Sunfire is listed as an emerging player. Broad incumbents are Aemetis and POET-DSM Advanced Biofuels. UPM Biofuels is listed as a regional player.
Does Comstock Fuels have an API?
No public API is recorded for Comstock Fuels.
What industry is Comstock Fuels in?
Comstock Fuels's product category is Low-carbon Biofuels. Its primary akta.pro industry code is IMAMALAA, Cellulosic Biofuels & Renewable Fuels (2G ethanol, SAF intermediates), with a secondary code of EUAAAHAF, Biofuel Feedstock Preprocessing & Pretreatment (Milling, Fractionation, Hydrolysis). Its NAICS code is 325193 and its SIC code is 2911.