2025 has been the year of AI agents.
From taking center stage at tech conferences to dominating the early-stage startup scene, investors are hoping—and betting—that AI will go from chatbot to action hero.
AI agents are finding footholds everywhere as investors continue to fork over capital. Agentic coding startups are raising billions, with Cursor recently raking in a $2.3 billion Series D. Hippocratic AI, a startup developing AI agents for healthcare, recently raised a $126 million Series C.
Global VC dollars invested in the category have increased every year, with $6.4 billion in deal value across 451 transactions in 2025 through Oct. 13, according to PitchBook data. In 2024, VCs poured $4.6 billion into 326 deals.
As the competition intensifies, here is a list of the 10 most active VC investors in the AI agents sector since 2019, according to PitchBook data.
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