Data tracked by FINTRX showed that family offices took part in 109 deals in August, with disclosed financing across those rounds reaching $16.9 billion. Follow-on rounds, where family offices reinvested in companies they already backed, accounted for 27% of deal count, indicating that activity in sourcing and backing new opportunities was higher than continued deployment into existing portfolio companies.
a16z Perennial ranked first for the month with participation in 17 deals. The family office, launched in 2022 within the Andreessen Horowitz ecosystem, provides wealth management and investment services for core partners Marc Andreessen and Ben Horowitz, as well as entrepreneurs they support. Its regulatory assets under management stood at about $2.74 billion by the end of 2025, and the financing rounds it joined in August had a disclosed aggregate size of roughly $10.45 billion.
YZi Labs, backed by Binance founder CZ, ranked second after joining 10 deals in August. The firm manages more than $10 billion globally and invests across Web3, artificial intelligence and healthcare. FINTRX said the rounds involving YZi Labs totaled $42.1 million. The report also stressed that these figures refer to the total size of each financing round across all investors, not the amount committed by a family office itself.
FINTRX data tracked in August showed that family offices participated in 109 deals during the month, with disclosed financing across those transactions reaching $16.9 billion, according to BlockBeats on Sept. 8.
Follow-on rounds accounted for 27% of the deal count. In other words, family offices were more active in finding and funding new companies than in adding capital to businesses they had already backed.
August activity rankings
a16z Perennial was the most active family office in August. The firm was established in 2022 as a family office platform within the Andreessen Horowitz ecosystem. It provides wealth management and investment services for core partners Marc Andreessen and Ben Horowitz, along with entrepreneurs they support. By the end of 2025, its regulatory assets under management were about $2.74 billion.
During August, a16z Perennial participated in 17 deals, ranking first. The disclosed aggregate size of those financing rounds reached about $10.45 billion.
YZi Labs, which is affiliated with Binance founder CZ, ranked second. The firm manages more than $10 billion globally and invests across Web3, artificial intelligence and healthcare, while backing startups at different stages of development.
In August, YZi Labs participated in 10 deals, trailing only a16z Perennial. The financing rounds tied to those transactions totaled $42.1 million.
How the figures were counted
The report said the dollar amounts refer to the full size of each financing round across all investors, rather than the actual amount invested by a given family office. Because family office investing is often private, the specific amount committed by a single family office in each transaction is usually difficult to obtain.
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