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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
KLAC icon
426
KLA
KLAC
$272B
$5.92M 0.02%
176,910
+10,160
+6% +$339K
VBK icon
427
Vanguard Morningstar Small-Cap Growth ETF
VBK
$24.8B
$5.75M 0.02%
20,533
+955
+5% +$273K
CHD icon
428
Church & Dwight Co
CHD
$24B
$5.75M 0.02%
69,628
-1,988
-3% -$168K
SO icon
429
Southern Company
SO
$106B
$5.68M 0.02%
91,621
+1,850
+2% +$119K
NET icon
430
Cloudflare
NET
$111B
$5.6M 0.02%
49,735
-299
-0.6% -$35.7K
VGK icon
431
Vanguard FTSE Europe ETF
VGK
$31B
$5.58M 0.02%
85,096
-5,250
-6% -$360K
W icon
432
Wayfair
W
$14.1B
$5.55M 0.02%
21,728
+6,522
+43% +$1.84M
BBY icon
433
Best Buy
BBY
$17.5B
$5.53M 0.02%
52,295
-2,899
-5% -$326K
FNF icon
434
Fidelity National Financial
FNF
$12.8B
$5.52M 0.02%
126,653
-2,185
-2% -$96.9K
BKI
435
DELISTED
Black Knight, Inc. Common Stock
BKI
$5.52M 0.02%
76,686
-27,576
-26% -$2.12M
SEDG icon
436
SolarEdge
SEDG
$1.97B
$5.5M 0.02%
20,727
+7,071
+52% +$1.92M
NOBL icon
437
ProShares S&P 500 Dividend Aristocrats ETF
NOBL
$11.9B
$5.46M 0.02%
123,250
-13,370
-10% -$617K
APO icon
438
Apollo Global Management
APO
$81.9B
$5.45M 0.02%
88,555
+80,605
+1,014% +$4.84M
NVRO
439
DELISTED
NEVRO CORP.
NVRO
$5.43M 0.02%
46,642
-806
-2% -$106K
HEFA icon
440
iShares Currency Hedged MSCI EAFE ETF
HEFA
$7.79B
$5.41M 0.02%
157,315
+17
+0% +$590
BOTZ icon
441
Global X Robotics & Artificial Intelligence ETF
BOTZ
$3.59B
$5.37M 0.02%
146,903
-495
-0.3% -$17.8K
MRSH
442
Marsh
MRSH
$90.1B
$5.35M 0.02%
35,322
+3,041
+9% +$460K
MDLA
443
DELISTED
Medallia, Inc.
MDLA
$5.33M 0.02%
157,491
-14,154
-8% -$473K
SMH icon
444
VanEck Semiconductor ETF
SMH
$72B
$5.31M 0.02%
41,446
-212
-0.5% -$27.9K
AOS icon
445
A.O. Smith
AOS
$8.51B
$5.28M 0.02%
86,409
+14,151
+20% +$988K
VBR icon
446
Vanguard Morningstar Small-Cap Value ETF
VBR
$38.1B
$5.2M 0.02%
30,694
+869
+3% +$149K
INGN icon
447
Inogen
INGN
$154M
$5.19M 0.02%
120,406
-2,003
-2% -$123K
SIMS icon
448
State Street SPDR S&P Kensho Intelligent Structures ETF
SIMS
$8.74M
$5.17M 0.02%
118,397
+3,007
+3% +$138K
MRCC
449
DELISTED
Monroe Capital Corp
MRCC
$5.14M 0.02%
495,149
+14,068
+3% +$152K
KHC icon
450
Kraft Heinz
KHC
$29.1B
$5.12M 0.02%
139,086
+39,889
+40% +$1.5M
16 17
18
19 20

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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.