What does William Blair invest in?
William Blair invests most often at Venture and Series C (70% of the rounds on record), in sectors such as Energy Efficiency and Information Technology.

United States · Investor
Last cheque observed Jun 2026; 12 cheques on record.
Hedge fundDeploying nowNew fund $855M, Jul 2026
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1 cheques in the last 12 months
Mostly Venture and Series C: 70% of its rounds
Sole investor in 4 rounds, median $7.0M
5 exits from the portfolio
Every round we can evidence, newest first12 appearances
1 round
1 round
3 rounds
2 rounds
2 rounds
1 round
1 round
1 round
An announcement gives the size of the round, not the size of this investor's cheque: the only rounds that imply a cheque are those where they were the sole named investor.
Named by the firm itself, on a filing, its Form ADV or its company registration24 named
We also hold 50 people at this firm from the lists this database was built from: a weaker source than the filings, since a list does not say when a title ended. Login to see them.
From the firm's own filings with the SEC, which it must file accurately by law
Funds on its Form ADV
29 private funds, $1.2B in gross assets · filed Mar 2024
Private equity 19Equity - long only 5Other - equity long only 2
And 19 more on the filing.
Companies it backed that were later bought or listed5 in all
An exit counts when it came after the firm's first round in the company. From historical deal records.
The latest companies William Blair put money into.
Episodes that name William Blair in their description, not their title.

Doximity: The Hub of Healthcare - [Business Breakdowns, EP.236]
MentionsWilliam Blair

Snap-on: Tools of the Trades - [Business Breakdowns, EP.213]
MentionsWilliam Blair
William Blair invests most often at Venture and Series C (70% of the rounds on record), in sectors such as Energy Efficiency and Information Technology.
12 investments on record, 1 of them in the last 12 months. The most recent was in Jun 2026.
Its most recent investments on record: Digital Asset (Series F, Jun 2026).
The median round it joins is $355M.
Rarely, if at all: none of its 12 investments on record names it as the lead.
Most of the companies it backs are in the United States (100%).
Yes: it is actively investing, with 1 investments in the last 12 months.
William Blair is a hedge fund based in CHICAGO, United States.
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Built from the rounds we watched, its filings and its own website, refreshed every night. How we count · Report a correction · Is this your firm? Claim it