/

Investors / United States / SixThirty / Co-investors

SixThirty co-investors

Who invests alongside SixThirty · Venture capital · St. Louis, MO, United States

SixThirty shares at least one checked portfolio company with 31 other investors. It backs companies most often with Onigiri Capital (2), Y Combinator (2) and BitRock Capital (1), and 100% of its 7 checked companies have another investor VCinfo tracks.

31co-investors
7companies backed with another investorof 7 checked
100%of its portfolio is co-backed
Onigiri Capitalmost frequent co-investor2 shared companies

Co-investor network

the 14 firms it shares most with, and the companies they back together
19 shared companies9 shared companies5 shared companies5 shared companies4 shared companies3 shared companies3 shared companies3 shared companies3 shared companies2 shared companies2 shared companies2 shared companies2 shared companiesOnigiri Capital: 2 shared companiesOnigiri Capital2Y Combinator: 2 shared companiesY Combinator2BitRock Capital: 1 shared companiesBitRock Capital1Blumberg Capital: 1 shared companiesBlumberg Capital1CMT Digital: 1 shared companiesCMT Digital1Correlation Ventures: 1 shared companiesCorrelation Ventures1EJF Ventures: 1 shared companiesEJF Ventures1EnterpriseTech 34: 1 shared companiesEnterpriseTech 341Faction: 1 shared companiesFaction1Fin Capital: 1 shared companiesFin Capital1Headline: 1 shared companiesHeadline1Hetz Ventures: 1 shared companiesHetz Ventures1Maven 11: 1 shared companiesMaven 111Mighty Capital: 1 shared companiesMighty Capital1
Shared portfolio companies with SixThirtyFirms that also back companies together

Circle size is the number of companies shared with SixThirty; a line joins two co-investors that back at least two companies together.

All co-investors

ranked by shared portfolio companies
#InvestorSharedCompanies both back
1Onigiri CapitalVenture capital2Compare · Its co-investors
2Y CombinatorAccelerator · United States2Compare · Its co-investors
3BitRock CapitalVenture capital1Compare · Its co-investors
4Blumberg CapitalVenture capital · United States1Compare · Its co-investors
5CMT DigitalVenture capital · United States1Compare · Its co-investors
6Correlation VenturesVenture capital · United States1Compare · Its co-investors
7EJF VenturesVenture capital · United States1Compare · Its co-investors
8EnterpriseTech 34Venture capital · Portugal1Compare · Its co-investors
9FactionVenture capital1Compare · Its co-investors
10Fin CapitalVenture capital · United States1Compare · Its co-investors
11HeadlineVenture capital · United States1Compare · Its co-investors
12Hetz VenturesVenture capital · Israel1Compare · Its co-investors
13Maven 11Venture capital · Netherlands1Compare · Its co-investors
14Mighty CapitalVenture capital · United States1Compare · Its co-investors
15Mindset VenturesVenture capital · Brazil1Compare · Its co-investors
16NCA VCVenture capital1Compare · Its co-investors
17NidobirdsVenture capital1Compare · Its co-investors
18Plug and PlayVenture capital · United States1Compare · Its co-investors
19PortageVenture capital · United States1Compare · Its co-investors
20PruVen CapitalVenture capital · United States1Compare · Its co-investors
21Rainmakingrainmaking.io1Compare · Its co-investors
22RestiveVenture capital · United States1Compare · Its co-investors
23Startupbootcamp Scale OsakaAccelerator · Italy1Compare · Its co-investors
24Tech Council VenturesVenture capital · United States1Compare · Its co-investors
25Town Hall VenturesVenture capital · United States1Compare · Its co-investors
26TriplePoint Capitaltriplepointcapital.com1Compare · Its co-investors
27TSVCVenture capital · United States1Compare · Its co-investors
28TX VenturesVenture capital · Switzerland1Compare · Its co-investors
29VenpaceVenture capital1Compare · Its co-investors
30Viola GrowthVenture capital · Israel1Compare · Its co-investors
31Wing Venture CapitalVenture capital · United States1Compare · Its co-investors
Take this list with you. GET /v1/firms/sixthirty.co/coinvestors returns the ranked list as JSON for a CRM, a sheet or an AI agent: 25 firms a call on the free plan, 100 on Pro.
Get free API keyAPI docs

A co-investor is a firm whose own portfolio page lists a company that SixThirty's page lists too, both checked against the company's site. It shows who backs the same companies, not who joined the same round. How the data is graded

Free account · no card

Get SixThirty's co-investors as data

Pull this ranked list, SixThirty's portfolio and any firm's profile through one API key or MCP, compare portfolios side by side, and get an email when SixThirty adds a company.

Work email, sign-in link by email. Already have an account? Log in
  • Ask AI5 plain-English investor searches a day
  • Full listsEvery portfolio row and two-firm overlap
  • API and MCP100 REST or MCP calls a month, one key
  • AlertsFollow 5 investors for portfolio and fund changes
VCinfo API
$ curl -H "X-API-Key: YOUR_KEY" \
  https://api.vcinfo.io/v1/firms/sixthirty.co/coinvestors

# also
GET /v1/firms/sixthirty.co
GET /v1/firms/sixthirty.co/portfolio
The same data as an MCP server for Claude, Cursor and other AI tools. Set up MCP · Docs · Pricing