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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
GL icon
251
Globe Life
GL
$13.8B
$18.7M 0.05%
134,453
+99,233
+282% +$14M
VMC icon
252
Vulcan Materials
VMC
$36.9B
$18.6M 0.05%
68,215
-1,386
-2% -$408K
BJ icon
253
BJs Wholesale Club
BJ
$12.7B
$18.5M 0.05%
188,298
-108,208
-36% -$10.4M
CL icon
254
Colgate-Palmolive
CL
$74.2B
$18.3M 0.05%
215,089
-862
-0.4% -$76.8K
BLBD icon
255
Blue Bird Corp
BLBD
$2.26B
$18.2M 0.05%
320,736
+83
+0% +$4.48K
NTRS icon
256
Northern Trust
NTRS
$22B
$18.1M 0.05%
129,443
-8,272
-6% -$1.19M
DGX icon
257
Quest Diagnostics
DGX
$26B
$18M 0.05%
91,972
-11,403
-11% -$2.22M
MOD icon
258
Modine Manufacturing
MOD
$9.89B
$17.7M 0.05%
81,776
-39,293
-32% -$7.4M
ADI icon
259
Analog Devices
ADI
$174B
$17.4M 0.05%
54,790
+9,657
+21% +$3.07M
TMDX icon
260
Transmedics
TMDX
$2.66B
$17.3M 0.05%
174,017
+38,128
+28% +$4.97M
PAUG icon
261
Innovator US Equity Power Buffer ETF August
PAUG
$860M
$17.3M 0.05%
404,463
-27,410
-6% -$1.19M
CGGR icon
262
Capital Group Growth ETF
CGGR
$23.5B
$16.9M 0.05%
421,674
+23,140
+6% +$999K
CBOE icon
263
Cboe Global Markets
CBOE
$32.1B
$16.7M 0.05%
59,498
-1,322
-2% -$368K
VB icon
264
Vanguard Small-Cap ETF
VB
$79.2B
$16.7M 0.05%
63,572
+2,810
+5% +$760K
TROW icon
265
T. Rowe Price
TROW
$25.6B
$16.5M 0.05%
182,517
-34,198
-16% -$3.31M
IVW icon
266
iShares S&P 500 Growth ETF
IVW
$71.4B
$16.4M 0.05%
145,183
-4,055
-3% -$488K
ASML icon
267
ASML
ASML
$600B
$16.4M 0.05%
12,412
+141
+1% +$193K
CHWY icon
268
Chewy
CHWY
$9.47B
$16.4M 0.05%
606,765
-231,363
-28% -$6.45M
ARGX icon
269
argenx
ARGX
$55B
$16.4M 0.05%
22,407
-3,933
-15% -$3.08M
AGG icon
270
iShares Core US Aggregate Bond ETF
AGG
$138B
$16.2M 0.05%
163,555
+16,340
+11% +$1.63M
AJG icon
271
Arthur J. Gallagher & Co
AJG
$68.8B
$16.2M 0.05%
74,948
-13,790
-16% -$3.19M
IWR icon
272
iShares Russell Mid-Cap ETF
IWR
$56.2B
$16.2M 0.05%
166,306
+19,638
+13% +$1.96M
VXF icon
273
Vanguard Extended Market ETF
VXF
$30.1B
$16.1M 0.05%
78,357
-39,413
-33% -$8.44M
JEPI icon
274
JPMorgan Equity Premium Income ETF
JEPI
$45.7B
$16.1M 0.05%
283,646
+46,443
+20% +$2.7M
POCT icon
275
Innovator US Equity Power Buffer ETF October
POCT
$956M
$16M 0.05%
371,462
-464
-0.1% -$20.4K
9 10
11
12 13

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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.