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William Blair & Company Portfolio holdings
AUM
$38.4B
1-Year Est. Return
25.71%
This Fund
S&P 500
This Quarter
Est. Return
+7.16%
1 Year Est. Return
+25.71%
3 Year Est. Return
+88.7%
5 Year Est. Return
+104.53%
10 Year Est. Return
+665.86%
AUM
$37.6B
AUM Growth
+$1.57B
(+4.4%)
Cap. Flow
-$160M
Cap. Flow
% of AUM
-0.43%
Top 10 Holdings %
Top 10 Hldgs %
26.02%
Holding
1,919
New
98
Increased
697
Reduced
774
Closed
75
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Meta Platforms (Facebook)
META
|
+$76.1M |
| 2 |
Applovin
APP
|
+$75.3M |
| 3 |
ServiceNow
NOW
|
+$66.6M |
| 4 |
CWAN
Clearwater Analytics
CWAN
|
+$65.8M |
| 5 |
Diamondback Energy
FANG
|
+$30.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
CYBR
CyberArk
CYBR
|
+$70.7M |
| 2 |
Adobe
ADBE
|
+$61.7M |
| 3 |
Microsoft
MSFT
|
+$45.7M |
| 4 |
Workday
WDAY
|
+$42.6M |
| 5 |
Pool Corp
POOL
|
+$41.7M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 27.36% |
| 2 | Financials | 13.36% |
| 3 | Industrials | 12.59% |
| 4 | Healthcare | 10.97% |
| 5 | Consumer Discretionary | 7.45% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
201
Sherwin-Williams
SHW
$87.4B
| $26.2M | 0.07% |
75,557
+35,683
| +89% | +$12.6M |
|
202
Vanguard Short-Term Bond ETF
BSV
$45.6B
| $25.8M | 0.07% |
326,374
+2,390
| +0.7% | +$188K |
|
203
Zebra Technologies
ZBRA
$17.9B
| $25.7M | 0.07% |
86,550
-590
| -0.7% | -$188K |
|
204
Casella Waste Systems
CWST
$5.76B
| $25.4M | 0.07% |
267,978
+94,453
| +54% | +$9.51M |
|
205
Robinhood
HOOD
$85.3B
| $25M | 0.07% |
174,938
+19,572
| +13% | +$2.13M |
|
206
VanEck Gold Miners ETF
GDX
$27.8B
| $24.8M | 0.07% |
324,965
+22,092
| +7% | +$1.33M |
|
207
Vanguard Information Technology ETF
VGT
$149B
| $24.8M | 0.07% |
265,416
-2,184
| -0.8% | -$191K |
|
208
Alerian MLP ETF
AMLP
$13.2B
| $24.7M | 0.07% |
527,101
-4,716
| -0.9% | -$228K |
|
209
Parker-Hannifin
PH
$135B
| $24.7M | 0.07% |
32,583
+6,144
| +23% | +$4.53M |
|
210
Trex
TREX
$5.05B
| $24.4M | 0.07% |
473,146
-94,053
| -17% | -$5.73M |
|
211
iShares MSCI ACWI ex US ETF
ACWX
$12B
| $24.3M | 0.06% |
373,532
+33,096
| +10% | +$2.07M |
|
212
Morgan Stanley
MS
$342B
| $24.3M | 0.06% |
152,618
-1,045
| -0.7% | -$154K |
|
213
Vanguard Morningstar Mid-Cap Value ETF
VOE
$24.4B
| $24.1M | 0.06% |
137,951
+2,948
| +2% | +$502K |
|
214
Procept Biorobotics
PRCT
$1.22B
| $23.8M | 0.06% |
666,442
+169,237
| +34% | +$7.73M |
|
215
Affirm
AFRM
$24.6B
| $23.5M | 0.06% |
320,989
+16,030
| +5% | +$1.22M |
|
216
Vulcan Materials
VMC
$36.3B
| $22.8M | 0.06% |
74,195
+552
| +0.7% | +$157K |
|
217
Wells Fargo
WFC
$269B
| $22.8M | 0.06% |
271,795
+8,060
| +3% | +$654K |
|
218
Corning
GLW
$144B
| $22.6M | 0.06% |
275,142
-11,078
| -4% | -$724K |
|
219
T. Rowe Price
TROW
$23.8B
| $22.5M | 0.06% |
219,489
-9,217
| -4% | -$969K |
|
220
iShares Core MSCI Emerging Markets ETF
IEMG
$158B
| $22.5M | 0.06% |
341,742
+38,133
| +13% | +$2.38M |
|
|
DVAX
221
DELISTED
Dynavax Technologies
DVAX
| $22.1M | 0.06% |
2,228,609
-51,038
| -2% | -$531K |
|
222
Dynatrace
DT
$14.3B
| $21.9M | 0.06% |
452,268
-141,699
| -24% | -$7.17M |
|
223
Capital Group Dividend Value ETF
CGDV
$38.9B
| $21.9M | 0.06% |
521,015
+38,885
| +8% | +$1.6M |
|
224
BOK Financial
BOKF
$8.8B
| $21.7M | 0.06% |
195,170
| – | – |
|
225
Vanguard High Dividend Yield ETF
VYM
$84B
| $21.7M | 0.06% |
153,612
+2,896
| +2% | +$398K |
|
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William Blair & Company's Q3 2025 Portfolio in Review
As of Q3 2025, William Blair & Company held 1,919 positions worth $37.6B, up 4.4% from $36B the previous quarter. Its ten largest holdings account for 26% of the portfolio.
William Blair & Company's Q3 2025 filing shows 98 new, 697 increased, 774 reduced and 75 closed positions. Its largest new stake was Miami International Holdings: 363,765 shares worth $14.6M. The largest sale was CyberArk, an estimated $70.7M.
By sector, the portfolio is most concentrated in Technology at 27% of assets, down from 27% a quarter earlier, followed by Financials and Industrials.
- William Blair & Company's largest Q3 2025 buy was Miami International Holdings: 363,765 shares worth $14.6M.
- William Blair & Company added most to Meta Platforms (Facebook) in Q3 2025, an estimated $76.1M increase.
- William Blair & Company's biggest Q3 2025 reduction was CyberArk, cutting an estimated $70.7M.
- William Blair & Company fully exited Stride in Q3 2025, selling an estimated $7.47M.
- William Blair & Company's ten largest holdings make up 26% of its $37.6B portfolio in Q3 2025.
- William Blair & Company opened 98 new positions and closed 75 in Q3 2025.
- William Blair & Company's portfolio value rose 4.4% quarter-over-quarter to $37.6B.
Based on William Blair & Company's 13F filing for Q3 2025, filed 12 Nov 2025.