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William Blair & Company

William Blair & Company Portfolio holdings

AUM $38.4B
1-Year Est. Return 25.71%
This Fund
S&P 500
This Quarter Est. Return
+1.99%
1 Year Est. Return
+25.71%
3 Year Est. Return
+88.7%
5 Year Est. Return
+104.53%
10 Year Est. Return
+665.86%
AUM
$29.4B
AUM Growth
+$519M
Cap. Flow
+$281M
Cap. Flow %
0.96%
Top 10 Hldgs %
23.58%
Holding
1,987
New
99
Increased
752
Reduced
666
Closed
108

Top Buys

Rank Stock Value
1
ABNB icon
Airbnb
ABNB
+$45.2M
2
CHWY icon
Chewy
CHWY
+$31.5M
3
U icon
Unity
U
+$23.3M
4
RYAN icon
Ryan Specialty Holdings
RYAN
+$22.4M
5
AMZN icon
Amazon
AMZN
+$21.5M

Top Sells

Rank Stock Value
1
IDXX icon
Idexx Laboratories
IDXX
+$37.7M
2
GD icon
General Dynamics
GD
+$33.5M
3
ECL icon
Ecolab
ECL
+$31.7M
4
JNJ icon
Johnson & Johnson
JNJ
+$20.9M
5
UBER icon
Uber
UBER
+$19.2M

Sector Composition

Rank Sector Weight
1 Technology 26.19%
2 Healthcare 19.81%
3 Financials 11.61%
4 Consumer Discretionary 10.68%
5 Industrials 9.37%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
LNG icon
626
Cheniere Energy
LNG
$55.6B
$2.63M 0.01%
26,875
+3,802
+16% +$333K
VHT icon
627
Vanguard Health Care ETF
VHT
$19B
$2.62M 0.01%
10,588
+1,256
+13% +$322K
XME icon
628
State Street SPDR S&P Metals & Mining ETF
XME
$4.47B
$2.61M 0.01%
62,623
-3,128
-5% -$135K
ALBO
629
DELISTED
Albireo Pharma Inc
ALBO
$2.61M 0.01%
83,613
+23,071
+38% +$714K
SUB icon
630
iShares Short-Term National Muni Bond ETF
SUB
$11.4B
$2.59M 0.01%
24,116
+367
+2% +$39.6K
AVB icon
631
AvalonBay Communities
AVB
$26.2B
$2.59M 0.01%
11,690
+4,288
+58% +$963K
CHTR icon
632
Charter Communications
CHTR
$18.4B
$2.58M 0.01%
3,549
+304
+9% +$231K
MKTX icon
633
MarketAxess Holdings
MKTX
$5.72B
$2.58M 0.01%
6,130
-95
-2% -$43.6K
ONEM
634
DELISTED
1Life Healthcare
ONEM
$2.57M 0.01%
127,104
-56,695
-31% -$1.46M
XMTR icon
635
Xometry
XMTR
$5.43B
$2.57M 0.01%
+44,490
New +$3.08M
CMI icon
636
Cummins
CMI
$87.6B
$2.55M 0.01%
11,337
+25
+0.2% +$5.86K
BDSI
637
DELISTED
BioDelivery Sciences International, Inc.
BDSI
$2.54M 0.01%
702,143
-9,093
-1% -$34.3K
MAIN icon
638
Main Street Capital
MAIN
$5.52B
$2.52M 0.01%
61,323
-3,380
-5% -$141K
CHGG icon
639
Chegg
CHGG
$86M
$2.52M 0.01%
37,000
-23,982
-39% -$1.95M
SNPS icon
640
Synopsys
SNPS
$79.6B
$2.51M 0.01%
8,390
+693
+9% +$210K
VDC icon
641
Vanguard Consumer Staples ETF
VDC
$8.01B
$2.5M 0.01%
13,974
– –
ARE icon
642
Alexandria Real Estate Equities
ARE
$8.33B
$2.5M 0.01%
13,072
-126
-1% -$25.1K
EBAY icon
643
eBay
EBAY
$46.1B
$2.49M 0.01%
35,690
+4,051
+13% +$290K
TT icon
644
Trane Technologies
TT
$106B
$2.48M 0.01%
+14,389
New +$2.77M
CHRW icon
645
C.H. Robinson
CHRW
$17.6B
$2.48M 0.01%
28,514
-295
-1% -$26.7K
SCZ icon
646
iShares MSCI EAFE Small-Cap ETF
SCZ
$13.6B
$2.47M 0.01%
33,220
+1,207
+4% +$91.9K
MNRL
647
DELISTED
Brigham Minerals, Inc. Class A Common Stock
MNRL
$2.47M 0.01%
128,834
-973
-0.7% -$18.7K
OPEN icon
648
Opendoor
OPEN
$3.48B
$2.46M 0.01%
123,604
-14,982
-11% -$242K
RAMP icon
649
LiveRamp
RAMP
$2.3B
$2.46M 0.01%
52,002
-6,251
-11% -$282K
DKNG icon
650
DraftKings
DKNG
$12.5B
$2.45M 0.01%
50,801
+9,681
+24% +$513K
24 25
26
27 28

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William Blair & Company's Q3 2021 Portfolio in Review

As of Q3 2021, William Blair & Company held 1,987 positions worth $29.4B, up 1.8% from $28.9B the previous quarter. Its ten largest holdings account for 24% of the portfolio.

William Blair & Company's Q3 2021 filing shows 99 new, 752 increased, 666 reduced and 108 closed positions. Its largest new stake was Ryan Specialty Holdings: 709,555 shares worth $24M. The largest sale was Idexx Laboratories, an estimated $37.7M.

By sector, the portfolio is most concentrated in Technology at 26% of assets, up from 26% a quarter earlier, followed by Healthcare and Financials.

  • William Blair & Company's largest Q3 2021 buy was Ryan Specialty Holdings: 709,555 shares worth $24M.
  • William Blair & Company added most to Airbnb in Q3 2021, an estimated $45.2M increase.
  • William Blair & Company's biggest Q3 2021 reduction was Idexx Laboratories, cutting an estimated $37.7M.
  • William Blair & Company fully exited Slack Technologies, Inc. in Q3 2021, selling an estimated $13.8M.
  • William Blair & Company's ten largest holdings make up 24% of its $29.4B portfolio in Q3 2021.
  • William Blair & Company opened 99 new positions and closed 108 in Q3 2021.
  • William Blair & Company's portfolio value rose 1.8% quarter-over-quarter to $29.4B.

Based on William Blair & Company's 13F filing for Q3 2021, filed 12 Nov 2021.