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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
MRNA icon
451
Moderna
MRNA
$25.4B
$5.12M 0.02%
13,297
+448
+3% +$165K
AXDX
452
DELISTED
Accelerate Diagnostics
AXDX
$5.11M 0.02%
87,719
+2,660
+3% +$173K
ATR icon
453
AptarGroup
ATR
$8.47B
$5.11M 0.02%
42,804
-9,133
-18% -$1.2M
CERN
454
DELISTED
Cerner Corp
CERN
$4.99M 0.02%
70,774
-23,674
-25% -$1.83M
STKL
455
DELISTED
SunOpta
STKL
$4.97M 0.02%
556,602
+32,801
+6% +$331K
HSY icon
456
Hershey
HSY
$37B
$4.96M 0.02%
29,321
-89
-0.3% -$15.7K
FCX icon
457
Freeport-McMoran
FCX
$96.9B
$4.96M 0.02%
152,501
+26,826
+21% +$944K
D icon
458
Dominion Energy
D
$59.8B
$4.95M 0.02%
67,750
-1,001
-1% -$76.3K
VYMI icon
459
Vanguard International High Dividend Yield ETF
VYMI
$21.3B
$4.9M 0.02%
74,161
+307
+0.4% +$20.8K
KBWB icon
460
Invesco KBW Bank ETF
KBWB
$6.85B
$4.88M 0.02%
72,779
+7,334
+11% +$475K
IP icon
461
International Paper
IP
$21.8B
$4.87M 0.02%
91,924
-1,791
-2% -$99.7K
KRYS icon
462
Krystal Biotech
KRYS
$9.85B
$4.86M 0.02%
93,138
+34,383
+59% +$2.04M
SCHP icon
463
Schwab US TIPS ETF
SCHP
$16.2B
$4.86M 0.02%
155,216
-21,032
-12% -$664K
CHKP icon
464
Check Point Software Technologies
CHKP
$13.2B
$4.83M 0.02%
42,691
-3,968
-9% -$483K
PLAN
465
DELISTED
Anaplan, Inc.
PLAN
$4.83M 0.02%
79,258
-4,416
-5% -$263K
MUB icon
466
iShares National Muni Bond ETF
MUB
$45.9B
$4.82M 0.02%
41,522
-2,354
-5% -$276K
TBT icon
467
ProShares Trust UltraShort Lehman 20+ Year Treasury
TBT
$309M
$4.77M 0.02%
259,754
+254,000
+4,414% +$4.45M
III icon
468
Information Services Group
III
$249M
$4.74M 0.02%
660,538
-623,524
-49% -$4.15M
IHI icon
469
iShares US Medical Devices ETF
IHI
$3.48B
$4.74M 0.02%
75,485
+671
+0.9% +$42.8K
CAKE icon
470
Cheesecake Factory
CAKE
$5.84B
$4.69M 0.02%
99,876
-12,520
-11% -$588K
DRVN icon
471
Driven Brands
DRVN
$2.05B
$4.69M 0.02%
162,300
+21,150
+15% +$627K
FSLR icon
472
First Solar
FSLR
$24.4B
$4.67M 0.02%
48,919
-1,850
-4% -$172K
DSGX icon
473
Descartes Systems
DSGX
$6.65B
$4.64M 0.02%
57,051
+9,065
+19% +$687K
WSC icon
474
WillScot Mobile Mini Holdings
WSC
$4B
$4.64M 0.02%
146,166
-408
-0.3% -$11.8K
RWO icon
475
State Street SPDR Dow Jones Global Real Estate ETF
RWO
$1.28B
$4.59M 0.02%
89,858
+4,456
+5% +$238K
17 18
19
20 21

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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.