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William Blair Investment Management Portfolio holdings
AUM
$33.3B
1-Year Est. Return
44.76%
This Fund
S&P 500
This Quarter
Est. Return
+26.83%
1 Year Est. Return
+44.76%
3 Year Est. Return
+140.8%
5 Year Est. Return
+166.51%
10 Year Est. Return
+960.07%
AUM
$33.3B
AUM Growth
+$2.99B
(+9.9%)
Cap. Flow
-$2.39B
Cap. Flow
% of AUM
-7.2%
Top 10 Holdings %
Top 10 Hldgs %
28.95%
Holding
459
New
46
Increased
119
Reduced
231
Closed
56
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
GE Aerospace
GE
|
+$248M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$247M |
| 3 |
Applied Materials
AMAT
|
+$214M |
| 4 |
Teva Pharmaceuticals
TEVA
|
+$172M |
| 5 |
Canadian Natural Resources
CNQ
|
+$165M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$444M |
| 2 |
Microsoft
MSFT
|
+$343M |
| 3 |
Amazon
AMZN
|
+$295M |
| 4 |
TSMC
TSM
|
+$236M |
| 5 |
Twist Bioscience
TWST
|
+$201M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 37.42% |
| 2 | Healthcare | 13.71% |
| 3 | Industrials | 12.98% |
| 4 | Financials | 10.06% |
| 5 | Consumer Discretionary | 8.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
426
Korn Ferry
KFY
$4.43B
| – | – |
-39,865
| Closed | -$2.51M |
|
427
Lumentum
LITE
$80.3B
| – | – |
-26,579
| Closed | -$18.7M |
|
428
Louisiana-Pacific
LPX
$4.98B
| – | – |
-596,108
| Closed | -$43.4M |
|
429
NetEase
NTES
$78.6B
| – | – |
-6,065
| Closed | -$679K |
|
430
OneMain Financial
OMF
$7.23B
| – | – |
-271,107
| Closed | -$14.5M |
|
431
Planet Fitness
PLNT
$4.03B
| – | – |
-1,452,642
| Closed | -$108M |
|
432
Insulet
PODD
$10.1B
| – | – |
-139,130
| Closed | -$29.2M |
|
433
Pool Corp
POOL
$6.83B
| – | – |
-452,273
| Closed | -$91.5M |
|
434
Parsons
PSN
$5.23B
| – | – |
-1,487,529
| Closed | -$80.6M |
|
435
Quanterix
QTRX
$125M
| – | – |
-2,083,699
| Closed | -$7.33M |
|
436
Royal Bank of Canada
RY
$283B
| – | – |
-5,778
| Closed | -$935K |
|
437
Sanmina
SANM
$10.4B
| – | – |
-101,655
| Closed | -$13.2M |
|
438
Shopify
SHOP
$197B
| – | – |
-2,795
| Closed | -$332K |
|
439
Silgan Holdings
SLGN
$4.45B
| – | – |
-291,669
| Closed | -$11.3M |
|
440
Simply Good Foods
SMPL
$967M
| – | – |
-1,910,640
| Closed | -$27.4M |
|
441
Spotify
SPOT
$113B
| – | – |
-106,941
| Closed | -$51.9M |
|
|
STEL
442
DELISTED
Stellar Bancorp
STEL
| – | – |
-34,788
| Closed | -$1.27M |
|
|
THR
443
DELISTED
Thermon Group Holdings
THR
| – | – |
-647,539
| Closed | -$32.6M |
|
444
TKO Group
TKO
$13.5B
| – | – |
-22,676
| Closed | -$4.57M |
|
445
TriNet
TNET
$3.23B
| – | – |
-63,429
| Closed | -$2.31M |
|
|
TPH
446
DELISTED
Tri Pointe Homes
TPH
| – | – |
-574,030
| Closed | -$26.8M |
|
447
Texas Roadhouse
TXRH
$13.1B
| – | – |
-82,567
| Closed | -$13.6M |
|
448
Tyler Technologies
TYL
$15.5B
| – | – |
-215,748
| Closed | -$73.9M |
|
449
Veeva Systems
VEEV
$44.8B
| – | – |
-643,325
| Closed | -$113M |
|
450
Vital Farms
VITL
$463M
| – | – |
-120,471
| Closed | -$1.7M |
|
Similar funds
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William Blair Investment Management's Q2 2026 Portfolio in Review
As of Q2 2026, William Blair Investment Management held 459 positions worth $33.3B, up 9.9% from $30.3B the previous quarter. Its ten largest holdings account for 29% of the portfolio.
William Blair Investment Management withdrew a net $2.39B in Q2 2026, closing 56 positions and reducing 231 holdings. Its most notable exit was Coherent, an estimated $159M position sold in full.
By sector, the portfolio is most concentrated in Technology at 37% of assets, up from 36% a quarter earlier, followed by Healthcare and Industrials.
Against the trend, William Blair Investment Management opened a new position in GE Aerospace worth $296M.
- William Blair Investment Management's largest Q2 2026 buy was GE Aerospace: 790,801 shares worth $296M.
- William Blair Investment Management added most to Alphabet (Google) Class A in Q2 2026, an estimated $247M increase.
- William Blair Investment Management's biggest Q2 2026 reduction was Apple, cutting an estimated $444M.
- William Blair Investment Management fully exited Coherent in Q2 2026, selling an estimated $159M.
- William Blair Investment Management's ten largest holdings make up 29% of its $33.3B portfolio in Q2 2026.
- William Blair Investment Management opened 46 new positions and closed 56 in Q2 2026.
- William Blair Investment Management's portfolio value rose 9.9% quarter-over-quarter to $33.3B.
Based on William Blair Investment Management's 13F filing for Q2 2026, filed 12 Aug 2026.