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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
ARAV
1526
DELISTED
Aravive, Inc. Common Stock
ARAV
$160K ﹤0.01%
43,000
– –
SHLX
1527
DELISTED
Shell Midstream Partners, L.P.
SHLX
$160K ﹤0.01%
13,605
-791
-5% -$10.1K
ETHO icon
1528
Amplify Etho Climate Leadership US ETF
ETHO
$195M
$159K ﹤0.01%
2,680
– –
KWEB icon
1529
KraneShares CSI China Internet ETF
KWEB
$5.38B
$158K ﹤0.01%
3,331
-230
-6% -$12.1K
MTUM icon
1530
iShares MSCI USA Momentum Factor ETF
MTUM
$26.1B
$157K ﹤0.01%
894
-14
-2% -$2.49K
AERI
1531
DELISTED
Aerie Pharmaceuticals
AERI
$155K ﹤0.01%
+13,623
New +$199K
GSLC icon
1532
Goldman Sachs ActiveBeta US Large Cap Equity ETF
GSLC
$16.1B
$153K ﹤0.01%
1,777
+327
+23% +$29K
SPTS icon
1533
State Street SPDR Portfolio Short Term Treasury ETF
SPTS
$6.12B
$153K ﹤0.01%
5,000
– –
GRID
1534
First Trust NASDAQ Clean Edge Smart Grid Infrastructure Index Fund
GRID
$12.3B
$152K ﹤0.01%
1,638
– –
SPYM
1535
State Street SPDR Portfolio S&P 500 ETF
SPYM
$170B
$150K ﹤0.01%
2,965
+28
+1% +$1.45K
VONV icon
1536
Vanguard Russell 1000 Value ETF
VONV
$22.1B
$150K ﹤0.01%
2,177
– –
HYS icon
1537
PIMCO 0-5 Year High Yield Corporate Bond Index Exchange-Traded Fund
HYS
$1.78B
$149K ﹤0.01%
1,506
-68
-4% -$6.75K
ITUB icon
1538
Itaú Unibanco
ITUB
$81.7B
$148K ﹤0.01%
+38,521
New +$158K
SCHE icon
1539
Schwab Emerging Markets Equity ETF
SCHE
$12.9B
$148K ﹤0.01%
4,866
+3,530
+264% +$110K
SSRM icon
1540
SSR Mining
SSRM
$6.49B
$147K ﹤0.01%
10,133
– –
IYG icon
1541
iShares US Financial Services ETF
IYG
$2.23B
$146K ﹤0.01%
2,325
+1,215
+109% +$76.2K
TDW icon
1542
Tidewater
TDW
$4.52B
$145K ﹤0.01%
12,006
– –
IYE icon
1543
iShares US Energy ETF
IYE
$1.78B
$144K ﹤0.01%
5,109
– –
OSBC icon
1544
Old Second Bancorp
OSBC
$1.32B
$144K ﹤0.01%
11,061
+3
+0% +$36
FTSM icon
1545
First Trust Enhanced Short Maturity ETF
FTSM
$6.54B
$143K ﹤0.01%
2,381
+1,000
+72% +$59.9K
AFK icon
1546
VanEck Africa Index ETF
AFK
$104M
$141K ﹤0.01%
6,775
– –
HDSN
1547
Hudson Technologies
HDSN
$238M
$141K ﹤0.01%
39,900
-5,000
-11% -$16.7K
PIO icon
1548
Invesco Global Water ETF
PIO
$278M
$140K ﹤0.01%
3,535
+601
+20% +$25.2K
ICSH icon
1549
iShares Ultra Short Duration Bond Active ETF
ICSH
$8.4B
$139K ﹤0.01%
2,749
-247
-8% -$12.5K
VOOG icon
1550
Vanguard S&P 500 Growth ETF
VOOG
$27.5B
$139K ﹤0.01%
3,120
+1,350
+76% +$61.9K
60 61
62
63 64

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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.