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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
IVE icon
376
iShares S&P 500 Value ETF
IVE
$49.1B
$8.67M 0.02%
41,042
-1,027
-2% -$222K
SHAK icon
377
Shake Shack
SHAK
$2.54B
$8.63M 0.02%
97,575
-5,767
-6% -$531K
MKC icon
378
McCormick & Company Non-Voting
MKC
$14B
$8.62M 0.02%
170,800
+20,938
+14% +$1.33M
VIGI icon
379
Vanguard International Dividend Appreciation ETF
VIGI
$9.01B
$8.6M 0.02%
97,248
-1,242
-1% -$115K
VUSB icon
380
Vanguard Ultra-Short Bond ETF
VUSB
$8.94B
$8.6M 0.02%
172,722
-1,924
-1% -$95.9K
PHYS icon
381
Sprott Physical Gold
PHYS
$14.6B
$8.56M 0.02%
241,655
-8,510
-3% -$315K
VNOM icon
382
Viper Energy
VNOM
$8.43B
$8.56M 0.02%
182,085
-24,261
-12% -$1.04M
MGK icon
383
Vanguard Mega Cap Growth ETF
MGK
$31.3B
$8.53M 0.02%
116,015
-43,855
-27% -$3.44M
FITB
384
Fifth Third Bancorp
FITB
$51.3B
$8.51M 0.02%
183,202
+82,420
+82% +$4.06M
DCI icon
385
Donaldson
DCI
$10.7B
$8.48M 0.02%
99,920
-1,395
-1% -$135K
STIP icon
386
iShares 0-5 Year TIPS Bond ETF
STIP
$15.9B
$8.47M 0.02%
81,919
-390
-0.5% -$40.2K
BIV icon
387
Vanguard Intermediate-Term Bond ETF
BIV
$28.9B
$8.45M 0.02%
109,438
-1,536
-1% -$120K
FTV icon
388
Fortive
FTV
$18.2B
$8.41M 0.02%
152,155
-11,882
-7% -$666K
NOBL icon
389
ProShares S&P 500 Dividend Aristocrats ETF
NOBL
$11.9B
$8.4M 0.02%
158,388
+42,374
+37% +$2.32M
HSY icon
390
Hershey
HSY
$37.3B
$8.37M 0.02%
40,250
+1,436
+4% +$303K
PCTY icon
391
Paylocity
PCTY
$7.76B
$8.33M 0.02%
77,130
-21,783
-22% -$2.67M
XLC icon
392
State Street Communication Services Select Sector SPDR ETF
XLC
$22.5B
$8.33M 0.02%
75,107
-3,395
-4% -$393K
EXEL icon
393
Exelixis
EXEL
$13.9B
$8.29M 0.02%
193,238
-45,547
-19% -$1.96M
VTWO icon
394
Vanguard Russell 2000 ETF
VTWO
$17.2B
$8.29M 0.02%
82,735
+2,585
+3% +$270K
LRCX icon
395
Lam Research
LRCX
$313B
$8.14M 0.02%
38,085
-4,551
-11% -$1.02M
PRCT icon
396
Procept Biorobotics
PRCT
$1.02B
$8.1M 0.02%
323,935
+113,669
+54% +$3.2M
TTE icon
397
TotalEnergies
TTE
$192B
$8.08M 0.02%
88,789
+4,120
+5% +$315K
BN icon
398
Brookfield
BN
$102B
$8.03M 0.02%
198,374
+576
+0.3% +$25.5K
APPF icon
399
AppFolio
APPF
$6.62B
$7.98M 0.02%
50,596
-3,030
-6% -$574K
KR icon
400
Kroger
KR
$36.7B
$7.9M 0.02%
109,214
-30,181
-22% -$2.04M
14 15
16
17 18

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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.