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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
+13.98%
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
$27.3B
AUM Growth
+$3.7B
Cap. Flow
+$865M
Cap. Flow %
3.17%
Top 10 Hldgs %
25.38%
Holding
1,900
New
178
Increased
749
Reduced
623
Closed
72

Top Buys

Rank Stock Value
1
SPLK
Splunk Inc
SPLK
+$77.8M
2
GD icon
General Dynamics
GD
+$49.6M
3
ROK icon
Rockwell Automation
ROK
+$43.3M
4
LMBS icon
First Trust Exchange-Traded Fund IV First Trust Low Duration Opportunities ETF
LMBS
+$32.3M
5
JPM icon
JPMorgan Chase
JPM
+$30.6M

Top Sells

Rank Stock Value
1
WORK
Slack Technologies, Inc.
WORK
+$24.2M
2
NTRS icon
Northern Trust
NTRS
+$24.1M
3
BKNG icon
Booking.com
BKNG
+$22.5M
4
EXEL icon
Exelixis
EXEL
+$17.5M
5
DOCU
DocuSign
DOCU
+$15M

Sector Composition

Rank Sector Weight
1 Technology 27.82%
2 Healthcare 18.6%
3 Financials 11.15%
4 Consumer Discretionary 10.38%
5 Industrials 8.96%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
ESGV icon
926
Vanguard ESG US Stock ETF
ESGV
$13.7B
$815K ﹤0.01%
11,614
– –
SWKS icon
927
Skyworks Solutions
SWKS
$10.5B
$813K ﹤0.01%
5,320
+748
+16% +$110K
ACHC icon
928
Acadia Healthcare
ACHC
$2.82B
$812K ﹤0.01%
16,155
+8,059
+100% +$321K
SIX
929
DELISTED
Six Flags Entertainment Corp.
SIX
$812K ﹤0.01%
23,801
-9,877
-29% -$271K
PINS icon
930
Pinterest
PINS
$13.2B
$810K ﹤0.01%
12,293
+2,243
+22% +$135K
EVER icon
931
EverQuote
EVER
$864M
$807K ﹤0.01%
+21,601
New +$817K
OLED icon
932
Universal Display
OLED
$4.18B
$807K ﹤0.01%
3,510
-50
-1% -$10.7K
GTIP icon
933
Goldman Sachs Access Inflation Protected USD Bond ETF
GTIP
$296M
$804K ﹤0.01%
+14,007
New +$794K
SLCA
934
DELISTED
U.S. SILICA HOLDINGS, INC.
SLCA
$803K ﹤0.01%
114,338
-17,225
-13% -$74.8K
ROST icon
935
Ross Stores
ROST
$78.6B
$802K ﹤0.01%
6,528
-75
-1% -$7.86K
OPCH icon
936
Option Care Health
OPCH
$3.61B
$797K ﹤0.01%
+50,948
New +$758K
PS
937
DELISTED
Pluralsight, Inc. Class A Common Stock
PS
$797K ﹤0.01%
38,009
-16,453
-30% -$294K
RWT
938
Redwood Trust
RWT
$599M
$789K ﹤0.01%
89,855
-12,419
-12% -$107K
TVTY
939
DELISTED
Tivity Health, Inc. Common Stock
TVTY
$788K ﹤0.01%
+40,200
New +$667K
IJS icon
940
iShares S&P Small-Cap 600 Value ETF
IJS
$8.43B
$783K ﹤0.01%
9,632
+1,042
+12% +$75.7K
FRC
941
DELISTED
First Republic Bank
FRC
$780K ﹤0.01%
5,307
+16
+0.3% +$2.08K
EYE icon
942
National Vision
EYE
$1.51B
$778K ﹤0.01%
17,184
+1,803
+12% +$78.4K
IBDO
943
DELISTED
iShares iBonds Dec 2023 Term Corporate ETF
IBDO
$778K ﹤0.01%
29,600
– –
TOTL icon
944
State Street DoubleLine Total Return Tactical ETF
TOTL
$4.01B
$777K ﹤0.01%
15,764
+400
+3% +$19.7K
AFL icon
945
Aflac
AFL
$60.7B
$776K ﹤0.01%
17,443
-14,901
-46% -$610K
BCE icon
946
BCE
BCE
$21.7B
$773K ﹤0.01%
18,072
-4,554
-20% -$195K
DG icon
947
Dollar General
DG
$26.9B
$771K ﹤0.01%
3,668
+203
+6% +$43.4K
MPC icon
948
Marathon Petroleum
MPC
$100B
$771K ﹤0.01%
18,645
-1,815
-9% -$65.1K
DMRC icon
949
Digimarc Corp
DMRC
$158M
$768K ﹤0.01%
16,250
– –
QTRX icon
950
Quanterix
QTRX
$135M
$763K ﹤0.01%
+16,410
New +$716K
36 37
38
39 40

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William Blair & Company's Q4 2020 Portfolio in Review

As of Q4 2020, William Blair & Company held 1,900 positions worth $27.3B, up 16% from $23.6B the previous quarter. Its ten largest holdings account for 25% of the portfolio.

William Blair & Company deployed $865M of net new capital in Q4 2020, opening 178 new positions and adding to 749 existing holdings. Its largest new stake was Seagen Inc. Common Stock: 91,539 shares worth $16M.

By sector, the portfolio is most concentrated in Technology at 28% of assets, up from 27% a quarter earlier, followed by Healthcare and Financials.

On the sell side, the largest reduction was Slack Technologies, Inc., an estimated $24.2M trimmed.

  • William Blair & Company's largest Q4 2020 buy was Seagen Inc. Common Stock: 91,539 shares worth $16M.
  • William Blair & Company added most to Splunk Inc in Q4 2020, an estimated $77.8M increase.
  • William Blair & Company's biggest Q4 2020 reduction was Slack Technologies, Inc., cutting an estimated $24.2M.
  • William Blair & Company fully exited Dunkin' Brands Group, Inc. in Q4 2020, selling an estimated $12.1M.
  • William Blair & Company's ten largest holdings make up 25% of its $27.3B portfolio in Q4 2020.
  • William Blair & Company opened 178 new positions and closed 72 in Q4 2020.
  • William Blair & Company's portfolio value rose 16% quarter-over-quarter to $27.3B.

Based on William Blair & Company's 13F filing for Q4 2020, filed 9 Feb 2021.