Most active VC investors in AI agents
PitchBook's top 10 of investors by number of AI agent deals since 2019, published in December 2025. It shows which firms have backed the most startups building or selling AI agents.
- Reliability
- Grade B · 8/12
- Publisher
- PitchBook
- Ranks
- Venture firms, AI agents
- Editions
- 1 since 2025
- Method
- Data
- How items get in
- Compiled by the publisher
- Status
- New
Editions
| Edition | Published | Top of the list | On record |
|---|---|---|---|
| 2025 | December 23, 2025 | Y Combinator | 10 |
How the ranking works
PitchBook tallies VC deal participation from its own database for companies it classifies in the segment, counting deals since 2019. Per the methodology note, 'lists of the most active investors are based on a tally of relevant deal types as defined by PitchBook', aligned with PitchBook report methodologies. The list is limited to VC investors and excludes angel groups, accelerators, incubators and growth investors, among other investor types. Each firm card also shows exits, median deal size and select portfolio companies. Unusually for PitchBook's VC lists, this one includes Y Combinator, an accelerator, at the top.
Ranked positions: Each item has a position (1, 2, 3), with ties allowed. Firms cannot apply or pay to be included; the list is drawn from PitchBook's deal database. PitchBook sells data subscriptions to many of the ranked firms, and the article is free to read.
How far to trust it
Superscout grades every ranking on six criteria, each scored 0 to 2. Most active VC investors in AI agents scores 8 of 12, grade B.
- Transparency 1/2
- Methodology note describes counting rules and exclusions but not the full segment taxonomy.
- Independence 2/2
- Census from a data vendor; firms cannot apply or pay, though many are PitchBook customers.
- Evidence 2/2
- Hard deal-count data from PitchBook's database.
- Stability 2/2
- Same counting approach across the editions seen; cumulative window since 2019 moves forward each year.
- Coverage 1/2
- Top 10 only.
- Track record 0/2
- Edition count as documented in editions list.
History
Published December 23, 2025 by Jacob Robbins as a standalone article. No later edition was found as of September 2026.
How it is received
The lists are widely syndicated (for example on Yahoo Finance) and used by founders as a quick map of who writes the most checks in a segment. No attributable published criticism of these specific lists was found. The general limitation, noted in the lists' own framing, is that deal counts reward volume and say nothing about check size, lead roles or returns (the cards show median deal size and exits separately).
Strengths
- Based on a large proprietary deal database rather than surveys or submissions.
- Each firm card shows deal count, exits, median deal size and example portfolio companies.
- Free to read and short enough to scan in a minute.
- Explicit exclusion of angel groups, accelerators and growth investors keeps the list to VC firms.
Weaknesses
- Deal counts reward volume, so high-frequency small-check investors can outrank concentrated lead investors.
- Segment definitions (what counts as generative AI, infrastructure or agents) are PitchBook's own and not fully published.
- The ranked list sits in an embedded chart rather than article text, which makes it harder to cite and archive.
- Only ten firms are shown, so it says little about the wider field.
Open questions
Facts not verified yet. They stay visible so they are not mistaken for settled facts.
- The article teaser says 'firms like Index and a16z top the list', which does not match the chart order (Y Combinator first, Index ninth); the chart was used.
- The list includes Y Combinator, although PitchBook's standard note says lists exclude accelerators; the exact exclusion rule for this list is unclear.
- Ranks are inferred from display order; PitchBook did not print rank numbers.
Superscout describes Most active VC investors in AI agents independently from the publisher’s own pages and outside coverage, linked below. The rankings belong to PitchBook.