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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
PKW icon
1901
Invesco BuyBack Achievers ETF
PKW
$1.78B
– –
-164
Closed -$15K
PPL
1902
PPL Corp
PPL
$26.7B
– –
-95,002
Closed -$2.66M
RING icon
1903
iShares MSCI Global Gold Miners ETF
RING
$2.48B
– –
-50
Closed -$1K
RIO icon
1904
Rio Tinto
RIO
$165B
– –
-6,677
Closed -$560K
ROAD icon
1905
Construction Partners
ROAD
$6.9B
– –
-6,760
Closed -$212K
SMB icon
1906
VanEck Short Muni ETF
SMB
$314M
– –
-18,449
Closed -$333K
SNY icon
1907
Sanofi
SNY
$105B
– –
-4,982
Closed -$262K
SPLB icon
1908
State Street SPDR Portfolio Long Term Corporate Bond ETF
SPLB
$1.18B
– –
-290
Closed -$9K
SPTL icon
1909
State Street SPDR Portfolio Long Term Treasury ETF
SPTL
$10.7B
– –
-1,334
Closed -$55K
SRS icon
1910
ProShares UltraShort Real Estate
SRS
$16.1M
$0 ﹤0.01%
1
– –
SSD icon
1911
Simpson Manufacturing
SSD
$7.99B
– –
-1,840
Closed -$203K
SUPN icon
1912
Supernus Pharmaceuticals
SUPN
$2.78B
– –
-440
Closed -$14K
SYBT icon
1913
Stock Yards Bancorp
SYBT
$2.64B
– –
-4,533
Closed -$231K
TDTT icon
1914
FlexShares iBoxx 3-Year Target Duration TIPS Index Fund
TDTT
$2.53B
– –
-1,212
Closed -$32K
TFX icon
1915
Teleflex
TFX
$6.03B
– –
-1,389
Closed -$558K
THO icon
1916
Thor Industries
THO
$4.11B
– –
-3,926
Closed -$444K
TLPH icon
1917
Talphera
TLPH
$72.7M
– –
-1,063
Closed -$29K
UPWK icon
1918
Upwork
UPWK
$1.05B
– –
-7,688
Closed -$448K
VMEO
1919
DELISTED
Vimeo
VMEO
– –
-9,184
Closed -$450K
VTGN icon
1920
VistaGen Therapeutics
VTGN
$11.6M
– –
-407
Closed -$38K
WDFC icon
1921
WD-40
WDFC
$3.12B
– –
-1,235
Closed -$317K
WES icon
1922
Western Midstream Partners
WES
$19.9B
– –
-10,175
Closed -$218K
WOLF icon
1923
Wolfspeed
WOLF
$1.65B
– –
-4,732
Closed -$463K
WOOD icon
1924
iShares Global Timber & Forestry ETF
WOOD
$269M
– –
-11
Closed -$1K
XMPT icon
1925
VanEck CEF Muni Income ETF
XMPT
$219M
– –
-474
Closed -$14K
75 76
77
78 79

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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.