Oxcart Equity Partners
Oxcart Equity Partners is an impact-focused private investment firm founded in 2021 by Jamey Sperans to back companies that reduce climate risk and inequity. Its water footprint is small and deliberate: as of 2026 it has backed one water company, Accelerated Filtration, across two deals, and has led none.
Compiled by Antoine Walter, (don't) Waste Water, from official filings and direct intelligence in Leviathan.
The take
Oxcart Equity Partners is the personal investment vehicle of Jamey Sperans, who spent close to seventeen years running alternative investments at Morgan Stanley before leaving the big institutions to back companies that reduce climate risk and inequity. Oxcart calls itself stage-agnostic, which is a polite way of saying it writes the cheque that fits the company rather than the one that fits a fund's mandate.
Oxcart treats water as a small corner of that mandate, not the whole map. The firm has backed a single water company, Accelerated Filtration, across two rounds, a Michigan outfit whose patented VelRay X media strips fine suspended solids out of messy municipal and industrial streams. Oxcart came in alongside those rounds rather than at the front of them, and it has led none of its water deals, which is exactly why the (don't) Waste Water water-commitment scale rates it a One-Off.
Oxcart's edge is pedigree more than volume. Its early bench included Sarah Tuneberg, the Geospiza founder who ran Colorado's pandemic testing response and has since moved into state government, a sign that the firm's gravity sits at the intersection of climate, resilience and public good. I read Oxcart as a values-led generalist that will wade into water when the company fits the thesis, not a dedicated water fund waiting for a water-only deck.
Water Commitment Score
Compiled from official filings, third-party records, and direct intelligence from investors and founders, in Leviathan · recomputed monthly · as of Jun 2026.
How they invest
Portfolio · 1 water companies
Invests alongside
Highlighted = profiled on (don't) Waste Water.
Frequently asked
- What does Oxcart Equity Partners invest in?
- Oxcart Equity Partners backs companies working to reduce climate risk and inequity, investing across stages rather than from a fixed fund mandate. Its water exposure is light: as of 2026 the firm has backed one water company, Accelerated Filtration, a Michigan maker of fine-particle filtration technology for industrial and municipal water.
- Who runs Oxcart Equity Partners?
- Oxcart Equity Partners was founded in 2021 by Jamey Sperans, its Managing Partner, who previously spent close to seventeen years leading alternative investments at Morgan Stanley and later partnered at Foundry Group. Sarah Tuneberg, founder of the climate-risk startup Geospiza, served as an early Principal at the firm.
- Where is Oxcart Equity Partners based?
- Oxcart Equity Partners is registered in Houston, Texas, in the United States, and was established as a firm in 2021. It operates as a stage-agnostic private investment vehicle rather than a traditional pooled fund with a large team and multiple offices.
- How many water deals has Oxcart Equity Partners done?
- Oxcart Equity Partners has backed one water company, Accelerated Filtration, across two funding rounds, and has led none of them. That single, repeated commitment earns it a One-Off water rating on the (don't) Waste Water scale as of 2026.
- Is Oxcart Equity Partners the same as Oxcart Ventures?
- No. Oxcart Equity Partners is Jamey Sperans's Houston-registered impact investment firm. Oxcart Ventures is a separate Austin-based venture firm focused on defense and frontier technology, and OxCart Products is an unrelated cart and trailer manufacturer.