Transforming founder energy into lasting brilliance.

It takes a decade to build a great company.
Our mission is to make sure founders are shining brightly for the full journey.

Phosphor Capital invests in the top founders in each Y Combinator batch.

We invest early, bring conviction and help relentlessly. Typical check size is $100k - $500k.  

Portfolio Snapshot

Reducto
Circleback
Wordware
Tamarind
Corgi
Gumloop
Deepnight
Delve
TaxGPT
Apriora
StudyDojo
Brainbase
CrustData
Sample
mdhub
Browser Use
Parahelp
Momentic
sync
Platus
Taxo
Octolane
Leaping AI
Greenboard
Phonely
Solidroad
Unsloth
Central
Same
Domu

Testimonials

If you could have one angel, get Kulveer. He's closed pivotal early hires that were on the fence, took hours to talk through difficult situations, and game-planned our fundraising strategy. Communicating with him feels like getting advice from an experienced founder friend, not an investor. Kulveer's always in your corner and fighting for you (even on Sunday night calls) — he genuinely cares. I couldn't speak higher of him.

Karun Kaushik, Delve

We're lucky to have Kulveer on board. He helped us win a key early customer a month after investing, helped re-calibrate our hiring efforts at an important inflection point, and as a former founder, is someone I feel comfortable having truly important conversations with. We feel like we can ask him anything.

Adit Abraham, Reducto

Origin Story

Zeus Living (YC S11) was my moonshot. Zero to $450M revenue, $200M raised, pandemic pivots, layoffs and ultimately, a 2023 sale to Blueground. Good, but not the independent company outcome I wanted. I've lived every founder extreme: pivot hell, blitzscaling, cofounder turnover, board pressure. I now channel those scars into an unfair edge for the next wave of YC founders.

I've been a part of the YC ecosystem for 18 years. I've cofounded companies with Patrick and  John Collison, Harj Taggar and Tom Blomfield, and written 200+ post YC checks. Phosphor Capital exists to turn that lived insight into being the best investor in YC companies. Phosphor Capital launched in January 2024 with a $17M Fund I.