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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
IYE icon
1426
iShares US Energy ETF
IYE
$1.72B
$230K ﹤0.01%
3,554
+3
+0.1% +$170
ILMN icon
1427
Illumina
ILMN
$29.5B
$230K ﹤0.01%
1,867
+286
+18% +$37.6K
CM icon
1428
Canadian Imperial Bank of Commerce
CM
$106B
$230K ﹤0.01%
2,423
-205
-8% -$19.6K
XES icon
1429
State Street SPDR S&P Oil & Gas Equipment & Services ETF
XES
$352M
$230K ﹤0.01%
1,973
+1,950
+8,478% +$204K
NEO icon
1430
NeoGenomics
NEO
$1.99B
$228K ﹤0.01%
30,711
-216
-0.7% -$2.27K
EXPE icon
1431
Expedia Group
EXPE
$36.5B
$228K ﹤0.01%
986
-298
-23% -$73.2K
NXT icon
1432
Nextpower Inc
NXT
$14.1B
$226K ﹤0.01%
1,873
-675
-26% -$74.8K
SKYY icon
1433
First Trust Cloud Computing ETF
SKYY
$2.83B
$226K ﹤0.01%
2,064
+240
+13% +$27.9K
ASX icon
1434
ASE Group
ASX
$68.3B
$226K ﹤0.01%
+10,405
New +$219K
MSA icon
1435
Mine Safety
MSA
$6.79B
$226K ﹤0.01%
1,376
+68
+5% +$12.4K
BBVA icon
1436
Banco Bilbao Vizcaya Argentaria
BBVA
$142B
$225K ﹤0.01%
10,409
-8,672
-45% -$201K
BBIO icon
1437
BridgeBio Pharma
BBIO
$16.4B
$224K ﹤0.01%
+3,018
New +$219K
RING icon
1438
iShares MSCI Global Gold Miners ETF
RING
$2.26B
$224K ﹤0.01%
2,831
-2,534
-47% -$215K
GSG icon
1439
iShares S&P GSCI Commodity-Indexed Trust
GSG
$1B
$223K ﹤0.01%
+6,929
New +$185K
DOX icon
1440
Amdocs
DOX
$6.03B
$223K ﹤0.01%
3,415
+29
+0.9% +$2.12K
JOBY icon
1441
Joby Aviation
JOBY
$6.54B
$222K ﹤0.01%
26,851
-626
-2% -$7.05K
SNSR icon
1442
Global X Internet of Things ETF
SNSR
$211M
$221K ﹤0.01%
5,930
+23
+0.4% +$886
NOVTU
1443
Novanta Inc Units
NOVTU
$661M
$221K ﹤0.01%
4,116
– –
DNOW icon
1444
DNOW Inc
DNOW
$2.44B
$221K ﹤0.01%
18,518
-16
-0.1% -$217
UHS icon
1445
Universal Health Services
UHS
$10.2B
$221K ﹤0.01%
1,232
-158
-11% -$32.5K
SAM icon
1446
Boston Beer
SAM
$1.95B
$220K ﹤0.01%
+956
New +$215K
KBH icon
1447
KB Home
KBH
$3.5B
$219K ﹤0.01%
4,238
+103
+2% +$6.06K
RIOT icon
1448
Riot Platforms
RIOT
$6.9B
$219K ﹤0.01%
17,737
+52
+0.3% +$798
NVR icon
1449
NVR
NVR
$17.1B
$217K ﹤0.01%
+33
New +$241K
VTRS icon
1450
Viatris
VTRS
$20.8B
$217K ﹤0.01%
16,077
+512
+3% +$7.17K
56 57
58
59 60

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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.