WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC
Position in APH — Amphenol Corp /De/
CIK 1644956
CHICAGO, IL
Position in APH
as of Jun 30, 2026
· filed Aug 12, 2026
Position Value
$541,323,205
+$269,055,634 QoQ
Shares Held
6,140,236
+42.5% QoQ
Ownership
0.124%
of shares outstanding
% of Portfolio
1.62%
of 13F equity value
Holder Rank
#86
of 2,328 holders
Holding Since
Mar 2026
2 quarters on record
Voting authority
Sole 88%
Shared 0%
None 12%
Common Shares in APH Over Time
Shares Held
Position Value (USD)
Position in Electronic Components
Technology · as of Jun 30, 2026WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC holds $839,006,758 across 8 Electronic Components names. APH ranks #1 (64.5% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | APH |
Amphenol Corp /De/
This page
|
6,140,236 | $541,323,205 | |
| 2 | LFUS |
Littelfuse Inc /De
|
321,681 | $146,471,009 | |
| 3 | OSIS |
Osi Systems Inc
|
379,351 | $82,964,063 | |
| 4 | FN |
Fabrinet
|
59,519 | $33,454,439 | |
| 5 | KN |
Knowles Corp
|
494,516 | $20,512,523 | |
| 6 | CLS |
Celestica Inc
|
34,892 | $12,728,601 | |
| 7 | FLEX |
Flex Ltd.
|
6,397 | $1,036,761 | |
| 8 | JBL |
Jabil Inc
|
1,339 | $516,157 |
All Filings in APH
Export CSV
2 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | $541,323,205 | 1,535,059 | Shares | Sole | 2026-08-12 | |
| 2026-03-31 | $272,267,571 | 1,077,434 | Shares | Sole | 2026-05-08 | |
| No filing history on record for this holder in this stock. | ||||||