Most Active Developer Tools Investors in London 2026

6 firms writing Developer Tools checks in London, led by boldstart ventures, Tuesday Capital, FirstMark — ranked by verified deal count with the companies.

Developer Tools in London accounts for 5 tracked companies with verified cap-table data, 5 of which disclose round sizes totalling $480M. The median disclosed raise is $51M, and the largest is Stream at $228M, ahead of Tessl ($125M) and Spacelift ($51M).

The names that recur most often on these developer tools cap tables are Sofina (1 company), GV (1 company), Index Ventures (1 company), Accel Partners (1 company), Boldstart Ventures (1 company), Five Elms Capital (1 company). By latest disclosed round, the market skews Series A (2), Series D (1), Series C (1), Series B (1).

Companies tracked: 5
Disclosed funding total: $480M across 5 companies
Median disclosed raise: $51M
Largest raise: Stream — $228M
Stage mix: Series A 2 · Series D 1 · Series C 1 · Series B 1
Most recent dated round: 2026-01-01

Best funded Developer Tools in London companies

Stream — $228M (latest: Series D)
Tessl — $125M (latest: Series A)
Spacelift — $51M (latest: Series C)
Conduktor — $50M (latest: Series B)
SurrealDB — $26M (latest: Series A)

Sector × city funding reports (20)

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