Voice & Conversational Interfaces — sector dashboard · fobi

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Funding & analysis

Company

18

19

20

21

22

23

24

25

26

Total Raised

Round sizes
Mega-rounds ($200M+) dominate 2026: Sierra D ($950M), ElevenLabs D ($500M), Parloa D ($350M), Wispr Flow C ($280M). Median round size has jumped from ~$25M (2024–25) to $150M+ in late 2025–26. Seed and A rounds shrinking proportionally; B and C rounds inflating toward unicorn territory.
Stage mix
Late-stage concentration accelerating. Series C–D and acquisitions now represent 65% of capital in past 18 months. Seed rounds rare; Series A funding sparse. Growth and late-stage Series D funding clearly favored. Only Resemble AI B ($13M, Dec 2025) and Vapi B ($50M, May 2026) broke growth-stage momentum; most fresh capital chases proven traction above $1B valuation.
Lead investors
Index Ventures, Sequoia Capital, Altimeter Capital, and Andreessen Horowitz dominate across multiple rounds. Sequoia leads 5+ rounds in dataset; Index backs Sierra, LiveKit, Cartesia, DeepL. Tiger Global and Greenoaks Capital anchor Series C–D in 2024–25. New mega-round leads: Menlo Ventures (Wispr Flow C), General Catalyst (Parloa D). Early backers (Accel, Kleiner Perkins) remain active but stage-shifting upmarket.