Summit Partners Co-Investors 2026

Who Summit Partners invests alongside: Thirdbase Capital — mapped across 16 portfolio companies in 4 sectors and 12 cities.

Summit Partners accounts for 40 tracked companies with verified cap-table data, 40 of which disclose round sizes totalling $10B. The median disclosed raise is $116M, and the largest is Klaviyo at $1.5B, ahead of DMG Practice Management Solutions ($1.4B) and NinjaOne ($732M).

The names that recur most often on these co-invested cap tables are Summit Partners (40 companies), Andreessen Horowitz (3 companies), Khosla Ventures (3 companies), Bessemer Venture Partners (3 companies), Accel (2 companies), ICONIQ Growth (2 companies). By latest disclosed round, the market skews Growth (16), Series C (7), Series B (5), Series A (4).

Best funded Summit Partners companies

  1. Klaviyo — $1.5B (latest: IPO)
  2. DMG Practice Management Solutions — $1.4B (latest: Growth)
  3. NinjaOne — $732M (latest: Series C)
  4. Zenefits — $584M (latest: Series C)
  5. RELEX Solutions — $535M (latest: Growth)
  6. Zenoss — $515M
  7. Fuze — $500M (latest: Growth)
  8. ShipMonk — $365M (latest: Growth)
  9. Quantifind — $355M (latest: Growth)
  10. Modernizing Medicine — $332M (latest: Growth)
  11. ReCharge — $300M (latest: Growth)
  12. Markforged — $300M (latest: Series D)
  13. Included Health — $278M (latest: Growth)
  14. Earned Wealth — $218M (latest: Series B)
  15. Manychat — $163M (latest: Growth)

Summit Partners Alydar Gp, L.P. — related firms and companies (56)

Summit Partners Alydar Gp, L.P. profile · All research reports

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