William Blair Investment Management, LLC
Annual return '25
+32.5%
SPY '25
+17.7%
Alpha
+14.8ptsvs SPY
Invested
$30.3B
Holdings
413
Trades YTD
0
Performance · Fund vs SPY
Cumulative return · quarterly snapshotsCoverage 82%. 4 quarters of 2025 measured against SPY adj-close benchmark.
Top holdings · current snapshot
Source: 13F-HR01
$TSM
TAIWAN SEMICONDUCTOR MANUFAC
Q1 2026: Exited (was 5.99M shares)
6.2%
02
$NVDA
NVIDIA CORPORATION
Q1 2026: Exited (was 10.63M shares)
5.2%
03
$AAPL
APPLE INC
Q1 2026: Sold 100.0% (5.44M → 2.1k shares)
4.0%
04
$MSFT
MICROSOFT CORP
Q1 2026: Sold 100.0% (3.49M → 761 shares)
3.5%
05
$GOOGL
ALPHABET INC
Q1 2026: Sold 100.0% (3.15M → 1.2k shares)
2.4%
06
$AVGO
BROADCOM INC
Q1 2026: Exited (was 2.54M shares)
2.3%
07
$AMZN
AMAZON COM INC
Q1 2026: Exited (was 4.39M shares)
2.2%
08
$META
META PLATFORMS INC
Q1 2026: Exited (was 1.19M shares)
1.9%
09
$MA
MASTERCARD INCORPORATED
Q1 2026: Exited (was 1.08M shares)
1.8%
10
$AZN
ASTRAZENECA PLC
Q1 2026: Exited (was 47.1k shares)
1.2%
Recent trades · Last 90 days
No Form 4 / 13D / 13G trade events on file in the recent window. 13F filers report position snapshots quarterly rather than per-trade events, so this section is most useful for managers who also file Form 4 or 13D/G.
Convergence · Pattern Engine ships in v1.1
30-day windowIn development
Convergence participation lands with the Pattern Engine.
Once the Pattern Engine ships, this section will list every active convergence event this fund is named in — with the other named funds, the Congress members on the same name, and combined position size.
Source data: SEC EDGAR · 13F-HR filings · Performance through 2025-12-31 · Last refreshed 08:06 UTC.