Willett Advisors is a single-family office that manages the personal and philanthropic assets of Michael R. Bloomberg, including Bloomberg Philanthropies. Its investment strategy focuses on achieving long-term capital appreciation through a diversified portfolio across public markets, private equity, real assets, hedge funds, and direct investments, often with an emphasis on impact-oriented strategies.
Portfolio
2
Fund Size
$25B
Top Stage
Series B
Last 12 Mo
1
Stage Distribution
Portfolio
2 investments
| Company | Round | Amount | Date |
|---|---|---|---|
| AAVantgarde Bio | Series B | $141M | Nov 2025 |
| Disc Medicine | Series B | $90M | Sep 2021 |
Top Co-Investors
Atlas Venture2 shared
Forbion1 shared
Schroders Capital1 shared
ATHOS1 shared
CDP Venture Capital1 shared
NEVA SGR1 shared
Sixty Degree Capital1 shared
OrbiMed1 shared
Arix Bioscience1 shared
Janus Henderson Investors1 shared
Rock Springs Capital1 shared
Alexandria Venture Investments1 shared
Novo Holdings1 shared
Access Biotechnology1 shared
Last updated: 3 March 2026