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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
RDVY icon
126
First Trust Rising Dividend Achievers ETF
RDVY
$24.7B
$60.1M 0.17%
880,823
+127,514
+17% +$9.08M
GWW icon
127
W.W. Grainger
GWW
$66B
$59.4M 0.17%
54,418
+532
+1% +$581K
SDVY icon
128
First Trust SMID Cap Rising Dividend Achievers ETF
SDVY
$11.7B
$58.4M 0.17%
1,480,558
+173,007
+13% +$7.03M
GE icon
129
GE Aerospace
GE
$378B
$57.2M 0.16%
201,509
-1,827
-0.9% -$574K
BLK icon
130
Blackrock
BLK
$170B
$57M 0.16%
59,288
-7,312
-11% -$7.69M
APP icon
131
Applovin
APP
$141B
$55.7M 0.16%
139,951
-154,488
-52% -$74.7M
IWD icon
132
iShares Russell 1000 Value ETF
IWD
$82.3B
$55.5M 0.16%
259,648
+10,913
+4% +$2.39M
RYAN icon
133
Ryan Specialty Holdings
RYAN
$5.96B
$55.4M 0.16%
1,641,580
-880,891
-35% -$37.6M
EPD icon
134
Enterprise Products Partners
EPD
$83.6B
$55M 0.16%
1,454,357
+300,456
+26% +$10.6M
AMGN icon
135
Amgen
AMGN
$212B
$54.9M 0.16%
155,998
-8,198
-5% -$2.92M
RBA icon
136
RB Global
RBA
$21.7B
$54.7M 0.16%
570,387
-181,492
-24% -$19.2M
ALL icon
137
Allstate
ALL
$70.1B
$53.7M 0.15%
258,779
-54,262
-17% -$11.1M
MSI icon
138
Motorola Solutions
MSI
$73.2B
$53.3M 0.15%
122,743
+7,475
+6% +$3.24M
MDLN
139
Medline Inc
MDLN
$34.2B
$51.9M 0.15%
1,165,430
+1,117,380
+2,325% +$49.3M
ORCL icon
140
Oracle
ORCL
$346B
$51.7M 0.15%
351,104
-126,542
-26% -$20.6M
EMR icon
141
Emerson Electric
EMR
$85B
$51.1M 0.15%
389,990
+8,785
+2% +$1.26M
BAC icon
142
Bank of America
BAC
$439B
$50.8M 0.15%
1,042,103
-8,606
-0.8% -$444K
IJR icon
143
iShares Core S&P Small-Cap ETF
IJR
$110B
$50.1M 0.14%
402,792
+58,648
+17% +$7.45M
COIN icon
144
Coinbase
COIN
$44.2B
$49.7M 0.14%
284,790
+52,903
+23% +$10.4M
SPMD icon
145
State Street SPDR Portfolio S&P 400 Mid Cap ETF
SPMD
$18.4B
$49.7M 0.14%
838,805
+147,765
+21% +$8.99M
GILD icon
146
Gilead Sciences
GILD
$167B
$47.4M 0.14%
340,345
-28,585
-8% -$4M
KLAC icon
147
KLA
KLAC
$252B
$47.2M 0.14%
320,800
+2,260
+0.7% +$331K
IAU icon
148
iShares Gold Trust
IAU
$62.5B
$46.7M 0.13%
530,161
+122,708
+30% +$11.3M
MDY icon
149
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$26.9B
$46.7M 0.13%
75,677
+309
+0.4% +$196K
TSM icon
150
TSMC
TSM
$2.04T
$46.6M 0.13%
137,755
+16,426
+14% +$5.65M
4 5
6
7 8

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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.