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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
SF
1051
Stifel
SF
$12.4B
$659K ﹤0.01%
8,917
+1,667
+23% +$132K
ITRN icon
1052
Ituran Location and Control
ITRN
$1.08B
$657K ﹤0.01%
13,411
+35
+0.3% +$1.65K
NNE
1053
Nano Nuclear Energy
NNE
$799M
$655K ﹤0.01%
31,960
– –
CPB icon
1054
Campbell Soup
CPB
$6.85B
$654K ﹤0.01%
29,357
+2,926
+11% +$75.1K
IEI icon
1055
iShares 3-7 Year Treasury Bond ETF
IEI
$18.1B
$651K ﹤0.01%
5,487
+450
+9% +$53.7K
COLD icon
1056
Americold
COLD
$4.21B
$650K ﹤0.01%
56,691
+9,570
+20% +$120K
AN icon
1057
AutoNation
AN
$7.7B
$646K ﹤0.01%
3,309
-376
-10% -$75.9K
RACE icon
1058
Ferrari
RACE
$67.8B
$642K ﹤0.01%
1,898
-122
-6% -$42.7K
IDA icon
1059
Idacorp
IDA
$8B
$642K ﹤0.01%
4,492
-1,099
-20% -$151K
BBAX icon
1060
JPMorgan BetaBuilders Developed Asia Pacific-ex Japan ETF
BBAX
$6.66B
$641K ﹤0.01%
10,776
+180
+2% +$10.9K
USO icon
1061
United States Oil Fund
USO
$2.15B
$640K ﹤0.01%
+5,029
New +$446K
GLTR icon
1062
abrdn Physical Precious Metals Basket Shares ETF
GLTR
$2.45B
$636K ﹤0.01%
2,907
+546
+23% +$128K
NDEC
1063
Innovator Growth-100 Power Buffer ETF - December
NDEC
$60.6M
$633K ﹤0.01%
23,496
-720
-3% -$19.9K
KRYS icon
1064
Krystal Biotech
KRYS
$10.7B
$632K ﹤0.01%
2,448
-729
-23% -$194K
STEP icon
1065
StepStone Group
STEP
$3.54B
$631K ﹤0.01%
13,224
-6,818
-34% -$394K
OXY icon
1066
Occidental Petroleum
OXY
$55.7B
$631K ﹤0.01%
9,701
-8,969
-48% -$451K
CMS icon
1067
CMS Energy
CMS
$23.3B
$630K ﹤0.01%
8,126
+3,711
+84% +$275K
BAM icon
1068
Brookfield Asset Management
BAM
$75.6B
$628K ﹤0.01%
14,123
-10,866
-43% -$531K
IEX icon
1069
IDEX
IEX
$17B
$627K ﹤0.01%
3,309
+16
+0.5% +$3.16K
HUM icon
1070
Humana
HUM
$43.9B
$626K ﹤0.01%
3,608
-440
-11% -$90.2K
VAW icon
1071
Vanguard Materials ETF
VAW
$3.01B
$624K ﹤0.01%
2,768
+449
+19% +$103K
ALKT icon
1072
Alkami Technology
ALKT
$1.96B
$624K ﹤0.01%
39,795
-4,181
-10% -$77K
NGG icon
1073
National Grid
NGG
$79.3B
$623K ﹤0.01%
7,359
+253
+4% +$21.8K
IDEV icon
1074
iShares Core MSCI International Developed Markets ETF
IDEV
$31.1B
$621K ﹤0.01%
7,431
+661
+10% +$56.9K
HPQ icon
1075
HP
HPQ
$26B
$616K ﹤0.01%
32,059
+1,943
+6% +$37.8K
41 42
43
44 45

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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.