The Venture Codex

Participated · Series B · Apr 2026

Membrane Technology and Research, Inc. (MTR) is a pioneer and leader in polymeric membrane-based gas separation systems. Founded in 1982 and headquartered in Newark, California, the company engineers, manufactures, and supplies custom membrane systems for carbon capture, natural gas processing, refining, and petrochemical applications worldwide.

Led · Series B · Jan 2026

Hydrosat operates a thermal-infrared satellite constellation combined with AI and machine-learning analytics to provide daily, field-scale “thermal intelligence.” With two satellites already in orbit, the company collects more than 10 million km² of imagery per day—an order-of-magnitude increase over existing commercial alternatives. Its data are used to monitor water consumption, optimize irrigation, detect vegetation stress, and generate temperature-based signals for defense and intelligence customers, even at night. Hydrosat’s platform currently oversees millions of hectares for clients such as NOAA, the National Reconnaissance Office, Bayer, SupPlant and Nutradrip. The firm plans to expand its presence in Central Asia, the Middle East and North Africa, India and Latin America while building a larger next-generation satellite fleet and broadening its crop and water-management solutions. The newly raised capital strengthens its balance sheet and supports this global expansion strategy.

Participated · Series A · Sep 2024

Mantel develops a proprietary molten-borate, high-temperature liquid-phase carbon-capture system engineered to integrate directly into industrial operations. The company says its system reduces energy losses by 97% and operates at less than half the industry-average cost per tonne. Mantel is rapidly moving into commercial deployment, with its first large-scale projects underway and demand growing across industrial customers. Current and announced deployments span power generation, oil and gas, pulp and paper, and chemicals, including projects with a major Canadian oil and gas producer, the TerraSpark Energy Campus in West Virginia, and Kruger’s Wayagamack Mill in Québec. The company has raised $50 million to date and plans to use recent capital to fund project development and expand its pipeline and international deployment efforts.

Participated · Series A · Sep 2024

Mantel Capture is developing the first molten-salt-based carbon capture technology designed to operate at the high temperatures inside boilers, kilns, and furnaces. Its system uses molten borates and has demonstrated carbon capture at lab scale of about 0.5 tonnes per day. The company plans a demonstration project at an industrial site that is roughly 10 times larger than the lab tests and is rated to capture about 1,800 tonnes of CO2 per year. Funding from the recent round will be used to implement that demonstration and to pave the way for full-scale commercial deployment of its high-temperature capture systems. Mantel positions its approach as enabling higher efficiency and substantial cost reductions, which it says can unlock broader deployment of carbon capture and help reach net-zero emissions by 2050. The company is based in Boston, MA.

Participated · Series D · Feb 2024

Insight M uses proprietary sensors mounted on aircraft to collect high-resolution data on fugitive methane emissions, enabling energy operators to identify, quantify, and remediate emitting infrastructure. The company aggregates an industry-leading methane emissions dataset that is leveraged for insights, benchmarks and rankings. Insight M serves energy operators in every producing region in the United States and in many regions globally through basin-wide aerial flyovers. Since inception the company says it has enabled the avoidance of more than 110 million metric tons of CO2e (GWP100), equivalent to planting 1.9 billion urban trees and letting them grow for 10 years. Management says the business delivers a commercially compelling balance between accuracy and cost-competitiveness and aims to advance operational success, public trust, and environmental stewardship. The recent funding is intended to accelerate deployment of its methane management solutions and expand its offerings to energy operators worldwide. Kairos Aerospace combines patented instruments and a proprietary data analysis pipeline to deliver high-frequency aerial methane detection and actionable leak-location information to energy-industry customers. Its aerial leak-detection service scans entire fields, enabling more frequent monitoring and faster identification, precise location, and repair of leaks, including from hard-to-access equipment. The company says its technology is already in widespread use across North America. Kairos intends to use proceeds from the fundraise to bring its methane-mitigation technology to customers. The company will rebrand as Insight M to align with its go-forward vision, with the change launching later in Q1. The article does not disclose revenue or user metrics. Kairos Aerospace provides large-scale aerial monitoring to detect and map methane leaks across oil and gas infrastructure using proprietary sensors and methane-detection algorithms. The company conducts basin-wide aerial surveys that fuse infrared data, GPS, and aerial photography to pinpoint leaks and deliver actionable insights to operators. In 2020 Kairos flew 288,000 miles across two countries and eight oilfield basins, surveying 12,000 square miles that included 96,000 active wells and 48,000 miles of pipelines. Kairos reports its data has enabled clients to eliminate 14.4 billion cubic feet of methane emissions, equivalent to removing 1.6 million vehicles from the road or reducing 7.3 million tons of CO2 emissions. The company will use the new funding to expand globally, grow its workforce and instrument fleet, and develop next-generation instruments to increase sensitivity and utility for customers. Kairos positions its service to address rising regulatory, investor, and public scrutiny around methane emissions and ESG expectations. Kairos Aerospace delivers basin-scale aerial surveys that identify the largest methane leaks using patented processes and infrared data combined with GPS and aerial photography. The company focuses on locating 'super emitters' that account for the bulk of methane emissions so customers can target the highest-impact reductions. Kairos says its technology is validated by Stanford researchers and is actionable for oil & gas operators. The company reported flying over 135,000 miles in the Permian Basin in 2019, grew its customer base by 71 percent, and used that work to prevent 3.9 billion cubic feet of methane emissions. Kairos positions its service as cost-effective and scalable and plans to expand operations and geographic coverage with new funding. The company was founded in 2014 and is headquartered in Mountain View, Calif.