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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
BEP icon
1101
Brookfield Renewable
BEP
$9.6B
$586K ﹤0.01%
17,965
-692
-4% -$20.9K
TXT icon
1102
Textron
TXT
$14.9B
$581K ﹤0.01%
6,637
-207
-3% -$19.3K
GBDC icon
1103
Golub Capital BDC
GBDC
$3.33B
$580K ﹤0.01%
45,826
+2,000
+5% +$25.7K
MTZ icon
1104
MasTec
MTZ
$22.7B
$577K ﹤0.01%
1,794
+50
+3% +$13.5K
MDYG icon
1105
State Street SPDR S&P 400 Mid Cap Growth ETF
MDYG
$2.76B
$576K ﹤0.01%
6,001
+387
+7% +$37.9K
TPR icon
1106
Tapestry
TPR
$30.3B
$573K ﹤0.01%
4,059
-344
-8% -$48.8K
SLYG icon
1107
State Street SPDR S&P 600 Small Cap Growth ETF
SLYG
$5B
$571K ﹤0.01%
5,915
+1,014
+21% +$100K
WMS icon
1108
Advanced Drainage Systems
WMS
$10.6B
$571K ﹤0.01%
+4,167
New +$645K
HLNE icon
1109
Hamilton Lane
HLNE
$3.88B
$571K ﹤0.01%
5,748
-22,402
-80% -$2.75M
PSCE icon
1110
Invesco S&P SmallCap Energy ETF
PSCE
$94M
$569K ﹤0.01%
9,338
-6,358
-41% -$339K
HSIC icon
1111
Henry Schein
HSIC
$9.78B
$567K ﹤0.01%
7,698
+37
+0.5% +$2.86K
CCL icon
1112
Carnival Corporation Ltd
CCL
$38.1B
$562K ﹤0.01%
21,718
+1,616
+8% +$47.1K
FXO icon
1113
First Trust Financials AlphaDEX Fund
FXO
$1.14B
$561K ﹤0.01%
9,980
– –
PWB icon
1114
Invesco Large Cap Growth ETF
PWB
$2.17B
$559K ﹤0.01%
4,440
-260
-6% -$34.4K
SRPT icon
1115
Sarepta Therapeutics
SRPT
$1.64B
$559K ﹤0.01%
25,690
-643
-2% -$12.4K
SHM icon
1116
State Street SPDR Nuveen ICE Short Term Municipal Bond ETF
SHM
$3.47B
$552K ﹤0.01%
11,543
-20
-0.2% -$964
ACWV icon
1117
iShares MSCI Global Min Vol Factor ETF
ACWV
$3.34B
$548K ﹤0.01%
4,584
– –
NU icon
1118
Nu Holdings
NU
$67.8B
$546K ﹤0.01%
38,014
-7,000
-16% -$113K
NJUL icon
1119
Innovator Growth-100 Power Buffer ETF July
NJUL
$246M
$545K ﹤0.01%
7,628
– –
TLTD icon
1120
FlexShares Morningstar Developed Markets ex-US Factor Tilt Index Fund
TLTD
$656M
$543K ﹤0.01%
5,776
-33
-0.6% -$3.2K
BNDX icon
1121
Vanguard Total International Bond ETF
BNDX
$82B
$541K ﹤0.01%
11,259
+543
+5% +$26.3K
GSLC icon
1122
Goldman Sachs ActiveBeta US Large Cap Equity ETF
GSLC
$14.8B
$540K ﹤0.01%
4,315
+553
+15% +$72.5K
LEN.B icon
1123
Lennar Class B
LEN.B
$19.9B
$538K ﹤0.01%
6,395
-1
-0% -$101
MTSI icon
1124
MACOM Technology Solutions
MTSI
$17.4B
$538K ﹤0.01%
2,421
+1,191
+97% +$266K
AEE icon
1125
Ameren
AEE
$30.4B
$536K ﹤0.01%
4,880
+736
+18% +$78.7K
43 44
45
46 47

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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.