Family offices (private investment vehicles for wealthy families) participated in 109 deals in August, with the associated financing rounds disclosing $16.9 billion in total funding, according to FINTRX tracking cited by BlockBeats on Sept. 8. Follow-on rounds, in which family offices invested again in companies they already backed, represented 27% of transactions, indicating greater activity in finding and funding new projects than adding capital to existing ones. a16z Perennial led the month with 17 deals, while YZi Labs, backed by Binance founder CZ, ranked second with 10. The related rounds for a16z Perennial disclosed about $10.45 billion in aggregate financing, while YZi Labs' transactions involved $42.1 million. Those figures cover all investors in each financing round, not the family offices' own contributions, which are often difficult to determine because of the private nature of family-office investing. YZi Labs invests across Web3, artificial intelligence and healthcare and manages more than $10 billion globally; a16z Perennial had about $2.74 billion in regulatory assets under management at the end of 2025.