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William Blair & Company

William Blair & Company Portfolio holdings

AUM $34.9B
1-Year Est. Return 18.88%
This Fund
S&P 500
This Quarter Est. Return
-3.16%
1 Year Est. Return
+18.88%
3 Year Est. Return
+73.84%
5 Year Est. Return
+90.13%
10 Year Est. Return
+512.03%
AUM
$34.9B
AUM Growth
-$2.36B
Cap. Flow
-$465K
Cap. Flow %
-0%
Top 10 Hldgs %
25.64%
Holding
2,019
New
132
Increased
799
Reduced
746
Closed
97

Top Buys

Rank Stock Value
1
RSP icon
Invesco S&P 500 Equal Weight ETF
RSP
+$224M
2
VEU icon
Vanguard FTSE All-World ex-US ETF
VEU
+$113M
3
PWR icon
Quanta Services
PWR
+$75M
4
GLD icon
SPDR Gold Trust
GLD
+$58.9M
5
BA icon
Boeing
BA
+$55.5M

Top Sells

Rank Stock Value
1
WDAY icon
Workday
WDAY
+$91.2M
2
CWAN
Clearwater Analytics
CWAN
+$78M
3
APP icon
Applovin
APP
+$74.7M
4
TYL icon
Tyler Technologies
TYL
+$69.1M
5
UBER icon
Uber
UBER
+$62.2M

Sector Composition

Rank Sector Weight
1 Technology 21.79%
2 Industrials 14.2%
3 Financials 12.26%
4 Healthcare 10.59%
5 Consumer Discretionary 7.17%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
DOV icon
176
Dover
DOV
$27.4B
$34.9M 0.1%
167,307
+83,761
+100% +$17.9M
BCPC
177
Balchem Corp
BCPC
$5.33B
$34.5M 0.1%
203,519
+163,473
+408% +$27.8M
ATI icon
178
ATI
ATI
$25.5B
$34.5M 0.1%
236,996
+192,894
+437% +$26.9M
FERG icon
179
Ferguson
FERG
$45B
$34.4M 0.1%
147,307
+114,624
+351% +$27.9M
SCHD icon
180
Schwab US Dividend Equity ETF
SCHD
$104B
$33.6M 0.1%
1,095,793
+2,563
+0.2% +$77.7K
MPWR icon
181
Monolithic Power Systems
MPWR
$63B
$33.4M 0.1%
30,557
+16,910
+124% +$18.5M
DIS icon
182
Walt Disney
DIS
$172B
$33.1M 0.09%
343,258
-13,393
-4% -$1.42M
WDAY icon
183
Workday
WDAY
$39.4B
$33.1M 0.09%
254,398
-574,666
-69% -$91.2M
PLTR icon
184
Palantir
PLTR
$296B
$33M 0.09%
225,694
+28,990
+15% +$4.43M
VOE icon
185
Vanguard Mid-Cap Value ETF
VOE
$24.1B
$32.7M 0.09%
177,550
+37,386
+27% +$6.98M
TXN icon
186
Texas Instruments
TXN
$253B
$32.7M 0.09%
168,472
-6,573
-4% -$1.33M
MTD icon
187
Mettler-Toledo International
MTD
$28.1B
$32.3M 0.09%
25,604
+20,386
+391% +$27.5M
SMMD icon
188
iShares Russell 2500 ETF
SMMD
$3.59B
$31.6M 0.09%
414,411
-65,546
-14% -$5.17M
ADBE icon
189
Adobe
ADBE
$99B
$31.3M 0.09%
128,873
-189,575
-60% -$52.5M
VRT icon
190
Vertiv
VRT
$104B
$31.3M 0.09%
124,779
-28,886
-19% -$6.41M
PDEC icon
191
Innovator US Equity Power Buffer ETF December
PDEC
$980M
$31.2M 0.09%
734,990
-20,502
-3% -$889K
RSG icon
192
Republic Services
RSG
$66.6B
$31M 0.09%
141,662
+95,191
+205% +$20.9M
CGDV icon
193
Capital Group Dividend Value ETF
CGDV
$37.3B
$30.9M 0.09%
727,194
+106,458
+17% +$4.73M
APD icon
194
Air Products & Chemicals
APD
$65.2B
$30.7M 0.09%
105,846
-1,854
-2% -$511K
VZ icon
195
Verizon
VZ
$201B
$30.4M 0.09%
606,441
-13,416
-2% -$622K
GDX icon
196
VanEck Gold Miners ETF
GDX
$22.7B
$29.5M 0.08%
321,106
-5,525
-2% -$544K
MCO icon
197
Moody's
MCO
$83.9B
$29.2M 0.08%
66,954
+41,600
+164% +$19.7M
PJAN icon
198
Innovator US Equity Power Buffer ETF January
PJAN
$1.43B
$28.9M 0.08%
625,514
+228,336
+57% +$10.7M
IWB icon
199
iShares Russell 1000 ETF
IWB
$47.9B
$28.8M 0.08%
80,895
+4,751
+6% +$1.77M
CHD icon
200
Church & Dwight Co
CHD
$23.7B
$28.8M 0.08%
309,031
+141,035
+84% +$13.6M
6 7
8
9 10

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William Blair & Company's Q1 2026 Portfolio in Review

As of Q1 2026, William Blair & Company held 2,019 positions worth $34.9B, down 6.3% from $37.3B the previous quarter. Its ten largest holdings account for 26% of the portfolio.

William Blair & Company's Q1 2026 filing shows 132 new, 799 increased, 746 reduced and 97 closed positions. Its largest new stake was Silicon Motion: 103,179 shares worth $11.6M. The largest sale was Workday, an estimated $91.2M.

By sector, the portfolio is most concentrated in Technology at 22% of assets, down from 26% a quarter earlier, followed by Industrials and Financials.

  • William Blair & Company's largest Q1 2026 buy was Silicon Motion: 103,179 shares worth $11.6M.
  • William Blair & Company added most to Invesco S&P 500 Equal Weight ETF in Q1 2026, an estimated $224M increase.
  • William Blair & Company's biggest Q1 2026 reduction was Workday, cutting an estimated $91.2M.
  • William Blair & Company fully exited Dynavax Technologies in Q1 2026, selling an estimated $27.4M.
  • William Blair & Company's ten largest holdings make up 26% of its $34.9B portfolio in Q1 2026.
  • William Blair & Company opened 132 new positions and closed 97 in Q1 2026.
  • William Blair & Company's portfolio value fell 6.3% quarter-over-quarter to $34.9B.

Based on William Blair & Company's 13F filing for Q1 2026, filed 8 May 2026.