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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
EFV icon
276
iShares MSCI EAFE Value ETF
EFV
$28.2B
$15.9M 0.05%
213,629
+34,525
+19% +$2.59M
CB icon
277
Chubb
CB
$142B
$15.8M 0.05%
48,584
-1,149
-2% -$369K
INTC icon
278
Intel
INTC
$414B
$15.8M 0.05%
357,146
-12,250
-3% -$562K
NOVT icon
279
Novanta
NOVT
$4.86B
$15.7M 0.05%
133,117
-5,301
-4% -$695K
WST icon
280
West Pharmaceutical
WST
$23.5B
$15.7M 0.04%
62,466
+150
+0.2% +$37.3K
CMG icon
281
Chipotle Mexican Grill
CMG
$43.9B
$15.3M 0.04%
479,526
-148,804
-24% -$5.5M
PCOR icon
282
Procore
PCOR
$7.5B
$14.8M 0.04%
259,761
-967,748
-79% -$57.3M
EOG icon
283
EOG Resources
EOG
$77.5B
$14.5M 0.04%
100,217
+9,192
+10% +$1.12M
CACI icon
284
CACI
CACI
$10.9B
$14.3M 0.04%
26,238
+1,004
+4% +$604K
KMB icon
285
Kimberly-Clark
KMB
$37.5B
$14.2M 0.04%
147,156
-1,823
-1% -$187K
WPM icon
286
Wheaton Precious Metals
WPM
$48.3B
$14.2M 0.04%
108,118
-725
-0.7% -$101K
LNG icon
287
Cheniere Energy
LNG
$54.3B
$14.1M 0.04%
49,857
-1,132
-2% -$261K
VCSH icon
288
Vanguard Short-Term Corporate Bond ETF
VCSH
$44.7B
$14.1M 0.04%
177,992
+87,317
+96% +$6.96M
VMI icon
289
Valmont Industries
VMI
$8.91B
$14.1M 0.04%
35,276
-2,662
-7% -$1.16M
SYY icon
290
Sysco
SYY
$41B
$14M 0.04%
196,528
+329
+0.2% +$27.2K
MKL icon
291
Markel Group
MKL
$25.5B
$14M 0.04%
7,312
-395
-5% -$802K
SPYM
292
State Street SPDR Portfolio S&P 500 ETF
SPYM
$158B
$13.9M 0.04%
182,242
+8,484
+5% +$679K
PAVE icon
293
Global X US Infrastructure Development ETF
PAVE
$13.5B
$13.9M 0.04%
273,213
+45,016
+20% +$2.34M
XLE icon
294
State Street Energy Select Sector SPDR ETF
XLE
$39.2B
$13.7M 0.04%
223,445
-33,135
-13% -$1.78M
MO icon
295
Altria Group
MO
$126B
$13.4M 0.04%
203,438
+4,418
+2% +$284K
MDT icon
296
Medtronic
MDT
$113B
$13.3M 0.04%
153,247
+68,893
+82% +$6.6M
VOT icon
297
Vanguard Mid-Cap Growth ETF
VOT
$18.9B
$13.3M 0.04%
51,579
-14,245
-22% -$3.91M
RKLB icon
298
Rocket Lab Corp
RKLB
$37.5B
$12.9M 0.04%
201,561
+8,092
+4% +$610K
EEM icon
299
iShares MSCI Emerging Markets ETF
EEM
$27.4B
$12.9M 0.04%
227,767
+74,468
+49% +$4.38M
XYZ
300
Block Inc
XYZ
$48.9B
$12.9M 0.04%
214,717
-14,509
-6% -$882K
10 11
12
13 14

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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.