Do 645 Ventures and Y Combinator invest together?

Yes — 645 Ventures and Y Combinator appear together in 10 tracked portfolio companies, including Alex, AptDeco, DeepSource, Goldbelly, InpharmD.

How do 645 Ventures and Y Combinator compare on check size?

645 Ventures typically writes checks of $1M – $5M, while Y Combinator writes $500K.

Two firms that co-invest: side by side on stage, sector, check size, and track record, from public filings and the firms' own sites.

	645 Ventures	Y Combinator
Type	Venture capital	Accelerator
HQ	New York	San Francisco
Founded	2013	2005
Check size	$1M – $5M	$500K
Stages	Pre-Seed, Seed, Series A, Series B	Pre-Seed, Seed, Series A
Sectors	AI & Machine Learning, Consumer, Data & Infrastructure, Enterprise Software, Fintech, SaaS, Sector Agnostic, Space Tech	AI & Machine Learning, Biotech, Climate Tech, Deep Tech, EdTech, Robotics, SaaS, Sector Agnostic, Space Tech
AUM	$550M	—
Tracked investments	114	6,130
Exits (acquired/public)	—	839
Led rounds on record	—	21
Dated deals, last 24 mo	4	1304

Do 645 Ventures and Y Combinator invest together?: Yes — 645 Ventures and Y Combinator appear together in 10 tracked portfolio companies, including Alex, AptDeco, DeepSource, Goldbelly, InpharmD.
How do 645 Ventures and Y Combinator compare on check size?: 645 Ventures typically writes checks of $1M – $5M, while Y Combinator writes $500K.