§ 13F · FUND PROFILE
BLAIR WILLIAM & CO/IL.
William Blair, quality growth equity
AUM · $38.4B (13F)Positions · 2054Turnover · 88% · Q1Filed · Aug 11, 2026
CONCENTRATION
26%
Top 10 holdings
NEW BUYS
+155
+$307M deployed
EXITS
0
No exits
SECTOR SHIFT
TECHNOLOGY → OTHER
-4pp · +3pp
§ 01 · TOP HOLDINGS
The book · Q1 2026
FILED AUG 11, 2026
| # | Ticker | Name | Shares | $ value | % port | Δ Q1 |
|---|---|---|---|---|---|---|
| 1 | AAPL | APPLE INC | 5.72M | $1.7B | 4.3% | −3% |
| 2 | AMZN | AMAZON COM INC | 5.87M | $1.4B | 3.6% | −3% |
| 3 | MSFT | MICROSOFT CORP | 3.44M | $1.3B | 3.3% | −2% |
| 4 | NVDA | NVIDIA CORPORATION | 5.36M | $1.1B | 2.8% | −1% |
| 5 | GOOG | ALPHABET INC | 2.95M | $1.0B | 2.7% | −3% |
| 6 | GOOGL | ALPHABET INC | 2.40M | $857M | 2.2% | −1% |
| 7 | GEV | GE VERNOVA INC | 660K | $775M | 2.0% | −1% |
| 8 | JPM | JPMORGAN CHASE & CO | 2.27M | $743M | 1.9% | −2% |
| 9 | SPY | STATE STR SPDR S&P 500 ETF T | 848K | $633M | 1.6% | ±0% |
| 10 | V | VISA INC | 1.84M | $632M | 1.6% | ±0% |
§ 02 · SECTOR ALLOCATION
Where the money is
Other41.1% (+3pp)
Technology13.5% (−4pp)
Retail7.8% (±0)
Financial Services7.2% (−1pp)
Media6.7% (±0)
Health Care5.5% (−1pp)
§ 03 · THE BLAIR SIGNAL
AC read
BLAIR WILLIAM & CO/IL is a Quality / Compounder fund managing $38.4 billion in assets. The fund runs a massive portfolio of 2,054 positions, broad diversification across holdings, with the top 10 accounting for 26%. Trading activity is aggressive at 88% quarterly turnover, with 155 new positions and 0 exits last quarter. Top sector allocations: Other (41%), Technology (14%), Retail (8%).
Read the full dossier →§ 04 · FILING HISTORY
Q-by-Q deltas
3 OF 2 FILINGS MEASURED
Q1 2026
Busy quarter
+155 buys · −0 exits · 1544 changed
Q4 2025
Busy quarter
+124 buys · −0 exits · 1510 changed
Q3 2025
Busy quarter
+101 buys · −0 exits · 1469 changed