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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
TSLA icon
76
Tesla
TSLA
$1.22T
$110M 0.32%
296,041
+2,558
+0.9% +$1.05M
VUG icon
77
Vanguard Growth ETF
VUG
$216B
$109M 0.31%
1,502,580
+3,204
+0.2% +$249K
MRK icon
78
Merck
MRK
$323B
$108M 0.31%
901,789
+67,765
+8% +$7.82M
MCD icon
79
McDonald's
MCD
$192B
$108M 0.31%
348,243
+5,142
+1% +$1.64M
KO icon
80
Coca-Cola
KO
$362B
$108M 0.31%
1,415,735
-37,108
-3% -$2.81M
JLL icon
81
Jones Lang LaSalle
JLL
$15.5B
$103M 0.29%
337,417
-9,347
-3% -$3.02M
ORLY icon
82
O'Reilly Automotive
ORLY
$75.1B
$102M 0.29%
1,104,400
-9,640
-0.9% -$904K
ROK icon
83
Rockwell Automation
ROK
$51.9B
$102M 0.29%
284,067
+4,914
+2% +$1.94M
LYV icon
84
Live Nation Entertainment
LYV
$41.7B
$101M 0.29%
662,081
-18,362
-3% -$2.78M
GD icon
85
General Dynamics
GD
$105B
$100M 0.29%
292,035
+7,368
+3% +$2.61M
CRWD icon
86
CrowdStrike
CRWD
$183B
$98.5M 0.28%
1,009,516
+106,236
+12% +$11.3M
AME icon
87
Ametek
AME
$55.7B
$98.1M 0.28%
457,447
-28,727
-6% -$6.38M
ZTS icon
88
Zoetis
ZTS
$32.2B
$94M 0.27%
795,297
-174,666
-18% -$21.6M
ITW icon
89
Illinois Tool Works
ITW
$81.9B
$93.8M 0.27%
360,320
-9,107
-2% -$2.48M
EFA icon
90
iShares MSCI EAFE ETF
EFA
$76.8B
$93.1M 0.27%
958,805
+31,922
+3% +$3.19M
HEI icon
91
HEICO Corp
HEI
$49.9B
$92.4M 0.26%
336,799
+106,398
+46% +$34.3M
FANG icon
92
Diamondback Energy
FANG
$55.1B
$88.1M 0.25%
445,338
+141,152
+46% +$24M
NDAQ icon
93
Nasdaq
NDAQ
$52.5B
$87.1M 0.25%
1,026,010
+266,137
+35% +$23.8M
TMO icon
94
Thermo Fisher Scientific
TMO
$208B
$85M 0.24%
172,953
+15,943
+10% +$8.65M
PEP icon
95
PepsiCo
PEP
$191B
$84.9M 0.24%
546,566
+10,480
+2% +$1.63M
SBUX icon
96
Starbucks
SBUX
$118B
$84.1M 0.24%
938,548
+91,726
+11% +$8.68M
CAT icon
97
Caterpillar
CAT
$402B
$84M 0.24%
118,501
+2,249
+2% +$1.56M
SCHW
98
Charles Schwab
SCHW
$181B
$83.7M 0.24%
890,345
+172,882
+24% +$17M
IEFA icon
99
iShares Core MSCI EAFE ETF
IEFA
$188B
$83.6M 0.24%
922,976
+49,728
+6% +$4.64M
DE icon
100
Deere & Co
DE
$169B
$83.2M 0.24%
147,623
+15,934
+12% +$8.99M
2 3
4
5 6

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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.