California

OSS Capital L.P.

OSS Capital L.P., based in California, backs infrastructure and developer tool startups at Pre-Seed and Seed, leading rounds with checks from $500k to $10 million, as seen with Cal.com and Dagster Labs.

Entry stagePre-seed, Seed
Check size$500K to $10M
Leads roundsYes
FocusDev tools and infra
Latest fundn/a
Investing team1 peopleNo activity since Sep

Who you would pitch at OSS Capital L.P.

1 person on the investing team, 1 of them partners who can make the call. Partners are listed first.

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Writes $500K to $10M checks. Its smallest check is larger than 71% of firms in the atlas.

Bars: how many firms in the atlas report each band. Highlighted: this firm.

No recent activity since September 2026. Quiet does not mean closed.

Weekly count of activity updates. Activity is not a confirmed deal.

Before you pitch

Ownership target10-12%, > 12%
How to reach them[email protected]

Notable investments

Cal.comDagster LabsRemixNocoDBRustDesk

In their words

OSS CapitalOpen source software eats everything.oss.capital
Founders and investors at a Mode VC gathering

Send Mode VC your deck

Raising a pre-seed or seed round? We write $1M to $5M first checks and help founders with distribution. A partner reads every deck.

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Alert me when OSS Capital L.P. is active

One email when this firm shows new activity. Nothing else.

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Questions

What stage does OSS Capital L.P. invest in?

OSS Capital L.P. reports entry at pre-seed, seed.

How much does OSS Capital L.P. invest?

OSS Capital L.P. reports checks of $500K to $10M.

Does OSS Capital L.P. lead rounds?

Yes. OSS Capital L.P. says it can lead.

Who are the partners at OSS Capital L.P.?

Joseph Jacks (Founder & General Partner).

Is OSS Capital L.P. active right now?

No recent activity since September 2026.

Work at OSS Capital L.P.? Claim or correct this profile.