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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
ICE icon
26
Intercontinental Exchange
ICE
$84.9B
$213M 0.73%
1,858,481
+42,793
+2% +$5.08M
SYK icon
27
Stryker
SYK
$134B
$212M 0.72%
804,838
+20,276
+3% +$5.42M
POOL icon
28
Pool Corp
POOL
$7.32B
$211M 0.72%
485,912
+2,934
+0.6% +$1.39M
HD icon
29
Home Depot
HD
$353B
$209M 0.71%
637,766
+6,633
+1% +$2.18M
COST icon
30
Costco
COST
$419B
$199M 0.68%
442,929
-2,237
-0.5% -$983K
ACN icon
31
Accenture
ACN
$110B
$196M 0.67%
613,755
+2,610
+0.4% +$849K
CPRT icon
32
Copart
CPRT
$27.2B
$196M 0.67%
5,660,940
-9,444
-0.2% -$337K
AMT icon
33
American Tower
AMT
$79B
$193M 0.66%
728,999
+13,900
+2% +$3.96M
LULU icon
34
lululemon athletica
LULU
$14.3B
$192M 0.65%
474,360
+4,559
+1% +$1.83M
FISV
35
Fiserv Inc
FISV
$28B
$190M 0.65%
1,753,526
-104,765
-6% -$11.7M
TYL icon
36
Tyler Technologies
TYL
$13.2B
$189M 0.64%
412,866
-700
-0.2% -$334K
DIS icon
37
Walt Disney
DIS
$179B
$184M 0.63%
1,085,957
-1,207
-0.1% -$215K
META icon
38
Meta Platforms (Facebook)
META
$1.53T
$183M 0.62%
537,769
+6,318
+1% +$2.28M
FAST icon
39
Fastenal
FAST
$60.1B
$182M 0.62%
7,052,098
+95,978
+1% +$2.6M
AON icon
40
Aon
AON
$75.6B
$174M 0.59%
608,795
+1,385
+0.2% +$372K
WSO icon
41
Watsco Inc
WSO
$13.2B
$153M 0.52%
579,075
+6,411
+1% +$1.8M
JNJ icon
42
Johnson & Johnson
JNJ
$626B
$153M 0.52%
948,414
-122,349
-11% -$20.9M
TREX icon
43
Trex
TREX
$5.07B
$141M 0.48%
1,385,553
+144,666
+12% +$15.1M
ABMD
44
DELISTED
Abiomed Inc
ABMD
$141M 0.48%
431,850
+10,521
+2% +$3.56M
OKTA icon
45
Okta
OKTA
$26.1B
$138M 0.47%
580,498
+9,326
+2% +$2.32M
TWLO icon
46
Twilio
TWLO
$39.3B
$135M 0.46%
424,299
+16,522
+4% +$6.02M
UNH icon
47
UnitedHealth
UNH
$361B
$135M 0.46%
345,374
+1,565
+0.5% +$648K
GWRE icon
48
Guidewire Software
GWRE
$14.7B
$135M 0.46%
1,134,087
+15,268
+1% +$1.76M
KRNT icon
49
Kornit Digital
KRNT
$815M
$134M 0.46%
927,613
-5,759
-0.6% -$760K
CHWY icon
50
Chewy
CHWY
$9.2B
$133M 0.45%
1,955,576
+380,198
+24% +$31.5M
1
2
3 4 5

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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.