Participated · Series A · Jan 2026

Neurophos is an Austin-based semiconductor startup building optical processing units (OPUs) that integrate more than one million micron-scale optical processing elements onto a single chip. Using proprietary metamaterial optical modulators—miniaturized 10,000-fold versus prior photonic components—the company targets up to a 100× gain in both speed and energy efficiency over leading silicon GPUs. Its technology is positioned as a drop-in replacement for current data-center accelerators, addressing power, scalability and cost constraints facing large-scale AI inference. Total capital raised now stands at $118 million, providing resources to commercialize the first integrated photonic compute system, complete with datacenter-ready OPU modules, software stack and developer hardware. The Series A proceeds will support expansion of the Austin headquarters and the opening of a San Francisco engineering office to serve early customers. Neurophos’ founding team includes veterans from NVIDIA, Apple, Intel and other major chipmakers, bolstering its credibility in bringing photonic computing to market.

Led · Series B · Jan 2026

Sage Geosystems is a Houston-based pressure geothermal company that extracts energy from hot dry rock by harnessing both the earth’s heat and natural pressure. Its proprietary system supports three main applications: grid-scale energy storage, 24/7 power generation, and direct heating, which together broaden geothermal’s viable geography beyond traditional hydrothermal regions. The firm is currently building its first commercial pressure-geothermal power facility within an existing Ormat power plant, showcasing a pathway to low-cost, baseload renewable electricity. In 2024 Sage signed an agreement with Meta to supply up to 150 MW of geothermal baseload power for data-center expansion east of the Rocky Mountains. Proceeds from the latest financing will fund continued technology development, construction of the inaugural commercial plant, and expansion of its energy-storage offering. Following its Series B, the company has raised more than $97 million to date, backed by a mix of strategic energy players and climate-focused investors. Although Sage has not disclosed revenue or user metrics, the size of this round underscores investor confidence in its ability to scale geothermal as a global clean-energy resource.

Participated · Series B · Dec 2024

Heirloom is a climate-tech company founded in 2020 that is scaling a next-generation direct air capture platform designed to provide the most cost-effective path to gigaton-scale carbon removal. Its process accelerates natural carbon mineralization to pull CO₂ directly from ambient air, after which the captured gas can either be permanently sequestered underground or used to produce sustainable aviation fuel. The company is headquartered in Brisbane, California, and positions its technology to serve multiple decarbonization roles across energy and industrial markets. Heirloom has raised at least $150 million to date, including a Series B round led by climate-focused investors and airlines such as Japan Airlines, Mitsubishi Corporation, and Mitsui & Co., followed by a separate investment from United Airlines. Newly added strategic investors—the Development Bank of Japan and engineering firm Chiyoda—bring financial strength and large-scale project expertise that Heirloom intends to leverage for global deployment. These Japanese partnerships also poise the company to issue carbon credits within Japan’s emerging GX-ETS compliance market, expected to become Asia’s second-largest by 2026. Management describes the technology as versatile, capable of supporting clean-fuel production as well as permanent removals, and sees the fresh capital and alliances as critical to accelerating large-scale DAC facilities worldwide.

Participated · Series B · Sep 2024

AIR COMPANY develops a modular, energy-efficient AIRMADE™ platform that transforms captured CO₂ and hydrogen into high-demand synthetic fuels and chemicals. The company is focused on scalable sustainable aviation fuel (SAF) that integrates into existing aircraft and infrastructure. Its technology is designed to strengthen fuel supply chains, bolster energy security, and support domestic job creation. AIR COMPANY has validated its approach through commercial partnerships with airlines including JetBlue and Virgin Atlantic and through multiple government contracts, including with NASA and the Defense Innovation Unit. The company has received industry recognition such as the EPA Green Chemistry Challenge Award and the XPrize for Carbon Removal. New Series B capital will bolster engineering and R&D to accelerate large-scale production of CO₂-derived SAF. Air Company makes vodka, hand sanitizer and eau de parfum from CO2 using a process that converts carbon dioxide, water and solar energy into pure ethanol. The company sells consumer products direct and through distribution partners, and reports its vodka is frequently sold out. Air Company operates its own facilities (not contract manufacturers) to limit transportation emissions and runs them on renewable power, though current volumes are relatively low versus traditional manufacturers. Leadership says the firm intends to transition its technology into industrial sectors to scale impact and displace fossil carbon. The company plans to use new capital to build a third facility housing a commercial-scale carbon utilization system to exponentially increase CO2-derived ethanol and sustainable fuel production. Air Company debuted its CO2-made alcoholic beverage in 2019 and positions itself as a carbon technology company focused on carbon-negative alcohols.

Led · Series A · Jul 2024

Graphyte develops a Carbon Casting technology that sequesters carbon-containing biomass waste underground to produce low-cost carbon removals for carbon credit buyers. The company has commenced operations at its Loblolly project in Arkansas, which will reach a capacity of 50,000 metric tons of CO2 removed per year in early 2025. Graphyte plans to accelerate deployment and launch an additional four carbon removal facilities across 2025 and 2026. The company aims to scale to removing more than 5 million tCO2 per year by 2030. Led by CEO Barclay Rogers, Graphyte is positioning its technology to deliver durable, low-cost removals to the market. The company is based in Pine Bluff, Arkansas.