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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
TEVA icon
1201
Teva Pharmaceuticals
TEVA
$40.4B
$425K ﹤0.01%
14,104
+251
+2% +$8.07K
FWONK icon
1202
Liberty Media Series C
FWONK
$25.5B
$423K ﹤0.01%
4,971
-204
-4% -$17.8K
SR icon
1203
Spire
SR
$4.79B
$422K ﹤0.01%
4,664
+55
+1% +$4.83K
BHC icon
1204
Bausch Health
BHC
$1.75B
$421K ﹤0.01%
77,982
-20
-0% -$120
IEV icon
1205
iShares Europe ETF
IEV
$1.64B
$421K ﹤0.01%
6,192
+3,570
+136% +$252K
SMDV icon
1206
ProShares Russell 2000 Dividend Growers ETF
SMDV
$701M
$420K ﹤0.01%
6,106
+500
+9% +$35.1K
TERN
1207
DELISTED
Terns Pharmaceuticals
TERN
$419K ﹤0.01%
7,947
+1,897
+31% +$77.9K
NLY icon
1208
Annaly Capital Management
NLY
$17.3B
$419K ﹤0.01%
+19,805
New +$451K
TFPM icon
1209
Triple Flag Precious Metals
TFPM
$5.93B
$417K ﹤0.01%
12,000
– –
GALT icon
1210
Galectin Therapeutics
GALT
$230M
$417K ﹤0.01%
149,283
+111,399
+294% +$339K
SOLV icon
1211
Solventum
SOLV
$15.3B
$416K ﹤0.01%
6,372
-2,530
-28% -$188K
KWEB icon
1212
KraneShares CSI China Internet ETF
KWEB
$5.5B
$415K ﹤0.01%
14,596
+1,167
+9% +$38.2K
SANM icon
1213
Sanmina
SANM
$8.78B
$411K ﹤0.01%
3,173
+311
+11% +$45.7K
ZION icon
1214
Zions Bancorporation
ZION
$10.1B
$411K ﹤0.01%
7,132
+470
+7% +$27.7K
CR icon
1215
Crane Co
CR
$11.9B
$410K ﹤0.01%
2,397
+1
+0% +$192
GFI icon
1216
Gold Fields
GFI
$28.8B
$410K ﹤0.01%
9,021
-1,524
-14% -$76.6K
GATX icon
1217
GATX Corp
GATX
$6.45B
$409K ﹤0.01%
2,395
+157
+7% +$28.2K
PTC icon
1218
PTC
PTC
$15.3B
$406K ﹤0.01%
2,851
+907
+47% +$143K
AGNC icon
1219
AGNC Investment
AGNC
$12.7B
$404K ﹤0.01%
40,328
+12,125
+43% +$134K
HRMY icon
1220
Harmony Biosciences
HRMY
$2.08B
$403K ﹤0.01%
14,389
+80
+0.6% +$2.62K
GOVT icon
1221
iShares US Treasury Bond ETF
GOVT
$43.7B
$403K ﹤0.01%
17,590
-13,054
-43% -$301K
ICSH icon
1222
iShares Ultra Short Duration Bond Active ETF
ICSH
$8.06B
$402K ﹤0.01%
7,942
+594
+8% +$30.1K
SLYV icon
1223
State Street SPDR S&P 600 Small Cap Value ETF
SLYV
$4.89B
$402K ﹤0.01%
4,248
+1,379
+48% +$133K
LASR icon
1224
nLIGHT
LASR
$3.33B
$401K ﹤0.01%
+7,040
New +$381K
TKR icon
1225
Timken Company
TKR
$9.19B
$401K ﹤0.01%
3,982
-23
-0.6% -$2.29K
47 48
49
50 51

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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.