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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
IJH icon
151
iShares Core S&P Mid-Cap ETF
IJH
$123B
$46.4M 0.13%
687,309
+34,344
+5% +$2.38M
ADP icon
152
Automatic Data Processing
ADP
$106B
$46.4M 0.13%
228,188
-16,091
-7% -$3.69M
MDLZ icon
153
Mondelez International
MDLZ
$80.1B
$46.3M 0.13%
802,444
+445,836
+125% +$25.8M
BRK.A icon
154
Berkshire Hathaway Class A
BRK.A
$1.1T
$46M 0.13%
64
-2
-3% -$1.47M
VWO icon
155
Vanguard FTSE Emerging Markets ETF
VWO
$118B
$45.5M 0.13%
842,185
+212,827
+34% +$11.9M
TECH icon
156
Bio-Techne
TECH
$11.2B
$45.2M 0.13%
864,329
+635,517
+278% +$38.1M
NEE icon
157
NextEra Energy
NEE
$186B
$45.2M 0.13%
486,323
+78,522
+19% +$6.98M
AXON
158
Axon Enterprise
AXON
$43.5B
$44.9M 0.13%
105,721
+3,984
+4% +$2.07M
USFR icon
159
WisdomTree Floating Rate Treasury Fund
USFR
$18.1B
$43.3M 0.12%
861,142
-60,502
-7% -$3.05M
ROP icon
160
Roper Technologies
ROP
$38.8B
$43M 0.12%
121,381
+77,803
+179% +$28.7M
AMD icon
161
Advanced Micro Devices
AMD
$742B
$41.1M 0.12%
201,948
-70
-0% -$14.9K
TOST icon
162
Toast
TOST
$18.8B
$40.8M 0.12%
1,539,203
-119,274
-7% -$3.56M
GLW icon
163
Corning
GLW
$105B
$39.6M 0.11%
291,140
-18,715
-6% -$2.26M
PM icon
164
Philip Morris
PM
$315B
$39.5M 0.11%
238,803
-9,594
-4% -$1.67M
VO icon
165
Vanguard Mid-Cap ETF
VO
$107B
$39.4M 0.11%
549,364
+34,228
+7% +$2.54M
FNV icon
166
Franco-Nevada
FNV
$40.5B
$39.1M 0.11%
158,256
+130,091
+462% +$32.2M
PFE icon
167
Pfizer
PFE
$144B
$38.5M 0.11%
1,370,097
-12,572
-0.9% -$335K
MCHP icon
168
Microchip Technology
MCHP
$41.4B
$38.1M 0.11%
589,868
+327,309
+125% +$23.5M
PSX icon
169
Phillips 66
PSX
$83B
$37.7M 0.11%
206,924
+3,850
+2% +$603K
WFC icon
170
Wells Fargo
WFC
$263B
$37.2M 0.11%
467,212
+171,674
+58% +$14.7M
DOCN icon
171
DigitalOcean
DOCN
$13B
$36.6M 0.1%
426,570
+401,671
+1,613% +$25.3M
CSGP icon
172
CoStar Group
CSGP
$12.7B
$36.3M 0.1%
900,313
-1,123,210
-56% -$58.5M
RMD icon
173
ResMed
RMD
$30.3B
$36.2M 0.1%
161,342
-26,575
-14% -$6.62M
ACWX icon
174
iShares MSCI ACWI ex US ETF
ACWX
$11.3B
$36.1M 0.1%
527,619
+96,758
+22% +$6.83M
NET icon
175
Cloudflare
NET
$94B
$35.1M 0.1%
170,085
-27,775
-14% -$5.3M
5 6
7
8 9

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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.