William Blair Investment Management, LLC Portfolio Holdings

William Blair Investment Management, LLC

  • $35.8 Billion
  • Q3 2025

William Blair Investment Management, LLC has filed its 13F form on November 12, 2025 for Q3 2025 where it was disclosed a total value porftolio of $35.8 Billion distributed in 414 stocks.

Among their holdings, we can observe that their the top five positions include companies like: Nvidia Corp with a value of $2.16B, Microsoft Corp with a value of $1.99B, Taiwan Semiconductor Manufacturing CO LTD with a value of $1.79B, Apple Inc. with a value of $1.43B, and Amazon Com Inc with a value of $971M.

Examining the 13F form we can see an increase of $1.1B in the current position value, from $34.7B to 35.8B.

William Blair Investment Management, LLC is based out at Chicago, IL

Below you can find more details about William Blair Investment Management, LLC portfolio as well as his latest detailed transactions.

Portfolio value $35.8 Billion
Technology: $14.1 Billion
Consumer Cyclical: $4.74 Billion
Financial Services: $4.43 Billion
Healthcare: $3.74 Billion
Industrials: $3.61 Billion
Communication Services: $2.09 Billion
Consumer Defensive: $1.27 Billion
Basic Materials: $663 Million
Other: $1.15 Billion

Stock Holdings Table

Stock Market Cap. Holding Value (Reported) # of Shares. Last Trade Trade History
$465B
$2.16 Billion 6.03% of portfolio
11,569,001
Q3 2025 Reduced 5.73%
$3.78T
$1.99 Billion 5.55% of portfolio
3,836,826
Q3 2025 Reduced 3.64%
$1.46T
$1.79 Billion 5.01% of portfolio
6,422,158
Q3 2025 Reduced 3.02%
$4.3T
$1.43 Billion 4.0% of portfolio
5,620,453
Q3 2025 Added 6.98%
$2.39T
$971 Million 2.71% of portfolio
4,421,161
Q3 2025 Reduced 18.13%
$139B
$927 Million 2.59% of portfolio
2,811,124
Q3 2025 Reduced 5.0%
$1.37T
$871 Million 2.43% of portfolio
1,186,127
Q3 2025 Reduced 17.0%
$512B
$629 Million 1.76% of portfolio
1,105,345
Q3 2025 Reduced 9.42%
$79.1B
$619 Million 1.73% of portfolio
3,463,532
Q3 2025 Reduced 3.47%
$1.65T
$604 Million 1.69% of portfolio
2,486,002
Q3 2025 Added 592.03%
$19.3B
$549 Million 1.53% of portfolio
8,748,975
Q3 2025 Reduced 12.07%
$103B
$537 Million 1.5% of portfolio
229,804
Q3 2025 Reduced 3.69%
$5.2B
$426 Million 1.19% of portfolio
5,829,169
Q3 2025 Added 11.68%
$15.3B
$392 Million 1.1% of portfolio
4,678,809
Q3 2025 Reduced 1.27%
$25.3B
$391 Million 1.09% of portfolio
4,666,892
Q3 2025 Reduced 5.28%
$28.4B
$356 Million 0.99% of portfolio
2,440,888
Q3 2025 Reduced 9.88%
$182B
$333 Million 0.93% of portfolio
487,232
Q3 2025 Reduced 5.78%
$6.2B
$314 Million 0.88% of portfolio
2,915,674
Q3 2025 Reduced 17.73%
$593B
$311 Million 0.87% of portfolio
1,107,586
Q3 2025 Added 28.59%
$56.3B
$311 Million 0.87% of portfolio
19,449,424
Q3 2025 Added 182.92%
$404B
$299 Million 0.83% of portfolio
322,740
Q3 2025 Reduced 14.28%
$57.4B
$293 Million 0.82% of portfolio
459,019
Q3 2025 Reduced 33.0%
$43.5B
$275 Million 0.77% of portfolio
2,144,086
Q3 2025 Reduced 3.18%
$300B
$265 Million 0.74% of portfolio
768,535
Q3 2025 Added 12.34%
$6.36B
$256 Million 0.72% of portfolio
1,981,761
Q3 2025 Added 80.35%
$181B
$259 Million 0.72% of portfolio
2,644,874
Q3 2025 Reduced 3.91%
$19.5B
$240 Million 0.67% of portfolio
459,114
Q3 2025 Added 28.07%
$14.5B
$242 Million 0.67% of portfolio
651,474
Q3 2025 Reduced 5.0%
$17.7B
$237 Million 0.66% of portfolio
2,400,379
Q3 2025 Reduced 22.91%
$16.3B
$231 Million 0.65% of portfolio
1,255,310
Q3 2025 Reduced 17.27%
$31.2B
$229 Million 0.64% of portfolio
1,400,174
Q3 2025 Reduced 13.84%
$2.76B
$225 Million 0.63% of portfolio
1,511,080
Q3 2025 Added 37.24%
$26.2B
$224 Million 0.63% of portfolio
1,555,057
Q3 2025 Reduced 6.64%
$41.2B
$223 Million 0.62% of portfolio
748,644
Q3 2025 Added 21.39%
$36.7B
$221 Million 0.62% of portfolio
2,638,033
Q3 2025 Reduced 31.82%
$20.2B
$218 Million 0.61% of portfolio
820,073
Q3 2025 Added 71.65%
$74.9B
$216 Million 0.6% of portfolio
29,470,195
Q3 2025 Added 0.65%
$205B
$211 Million 0.59% of portfolio
1,433,452
Q3 2025 Added 5.92%
$8.51B
$208 Million 0.58% of portfolio
2,394,722
Q3 2025 Added 3.52%
$5.17B
$207 Million 0.58% of portfolio
1,769,867
Q3 2025 Reduced 9.84%
$9.78B
$209 Million 0.58% of portfolio
4,651,474
Q3 2025 Added 7.8%
$2.41B
$204 Million 0.57% of portfolio
5,104,695
Q3 2025 Reduced 5.52%
$6.08B
$202 Million 0.56% of portfolio
1,994,875
Q3 2025 Reduced 14.0%
$37.6B
$202 Million 0.56% of portfolio
2,999,718
Q3 2025 Reduced 4.59%
$123B
$197 Million 0.55% of portfolio
282,324
Q3 2025 Reduced 24.06%
$875M
$197 Million 0.55% of portfolio
5,023,703
Q3 2025 Reduced 19.96%
$4.09B
$193 Million 0.54% of portfolio
2,487,957
Q3 2025 Reduced 47.02%
$9.05B
$189 Million 0.53% of portfolio
411,802
Q3 2025 Added 17.56%
$76.2B
$191 Million 0.53% of portfolio
394,449
Q3 2025 Reduced 8.44%

Summary

  • Portfolio
  • No. of Stocks 414
  • Current Value $35.8 Billion
  • Prior Value $34.7 Billion
  • Filing
  • Period Q3 2025
  • Filing Date November 12, 2025
  • Form Type 13F-HR
  • Activity in Q3 2025
  • New Purchases 46 stocks
  • Additional Purchases 110 stocks
  • Sold out of 0 stocks
  • Reduced holdings in 256 stocks
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