WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC
Position in AMPX — Amprius Technologies, Inc.
CIK 1644956
CHICAGO, IL
Position in AMPX
as of Mar 31, 2026
· filed May 8, 2026
Position Value
$19,728,408
+$11,957,500 QoQ
Shares Held
1,170,131
+18.8% QoQ
Ownership
0.801%
of shares outstanding
% of Portfolio
0.07%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Dec 2025
2 quarters on record
Voting authority
Sole 76%
Shared 0%
None 24%
Common Shares in AMPX Over Time
Shares Held
Position Value (USD)
Position in Electrical Equipment & Parts
Industrials · as of Jun 30, 2026WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC holds $365,451,217 across 3 Electrical Equipment & Parts names.
All Filings in AMPX
Export CSV
2 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $19,728,408 | 1,170,131 | Shares | Sole | 2026-05-08 | |
| 2025-12-31 | $7,770,908 | 984,906 | Shares | Sole | 2026-02-09 | |
| No filing history on record for this holder in this stock. | ||||||