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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
VONE icon
826
Vanguard Russell 1000 ETF
VONE
$8.74B
$1.06M ﹤0.01%
6,037
+700
+13% +$116K
PETQ
827
DELISTED
PetIQ, Inc. Class A Common Stock
PETQ
$1.06M ﹤0.01%
27,504
+356
+1% +$11K
BPOP icon
828
Popular Inc
BPOP
$11.3B
$1.06M ﹤0.01%
18,750
– –
EXPD icon
829
Expeditors International
EXPD
$24.3B
$1.06M ﹤0.01%
11,100
+305
+3% +$27.8K
DAL icon
830
Delta Air Lines
DAL
$60B
$1.05M ﹤0.01%
26,213
+1,980
+8% +$72K
USIG icon
831
iShares Broad USD Investment Grade Corporate Bond ETF
USIG
$17.4B
$1.05M ﹤0.01%
16,939
+3,337
+25% +$204K
HPQ icon
832
HP
HPQ
$28.6B
$1.04M ﹤0.01%
42,299
-489
-1% -$10.3K
ISTB icon
833
iShares Core 1-5 Year USD Bond ETF
ISTB
$5.14B
$1.04M ﹤0.01%
20,104
-416
-2% -$21.4K
FUSB icon
834
First US Bancshares
FUSB
$90.7M
$1.04M ﹤0.01%
115,000
– –
HALO icon
835
Halozyme
HALO
$11.4B
$1.03M ﹤0.01%
24,228
-2,522
-9% -$90.7K
SSNC icon
836
SS&C Technologies
SSNC
$19.3B
$1.03M ﹤0.01%
14,215
+1,161
+9% +$77.8K
RVTY icon
837
Revvity
RVTY
$13.1B
$1.03M ﹤0.01%
7,200
+965
+15% +$128K
IVE icon
838
iShares S&P 500 Value ETF
IVE
$50.3B
$1.02M ﹤0.01%
7,980
+2,754
+53% +$333K
CARG icon
839
CarGurus
CARG
$3.38B
$1.02M ﹤0.01%
32,125
-26,292
-45% -$650K
LYB icon
840
LyondellBasell Industries
LYB
$20.2B
$1.02M ﹤0.01%
11,104
+4,386
+65% +$357K
RCKT icon
841
Rocket Pharmaceuticals
RCKT
$367M
$1.02M ﹤0.01%
18,566
-20,438
-52% -$745K
HASI icon
842
Hannon Armstrong Sustainable Infrastructure Capital
HASI
$5.44B
$1.01M ﹤0.01%
15,959
+2,865
+22% +$146K
MNRL
843
DELISTED
Brigham Minerals, Inc. Class A Common Stock
MNRL
$1.01M ﹤0.01%
91,859
+12,663
+16% +$131K
IXN icon
844
iShares Global Tech ETF
IXN
$9.47B
$1M ﹤0.01%
20,106
+1,488
+8% +$68.8K
XRAY icon
845
Dentsply Sirona
XRAY
$2.31B
$1M ﹤0.01%
19,186
+7,489
+64% +$369K
BHP icon
846
BHP
BHP
$222B
$999K ﹤0.01%
17,146
-7,828
-31% -$392K
TIF
847
DELISTED
Tiffany & Co.
TIF
$999K ﹤0.01%
7,600
+4,949
+187% +$633K
WAT icon
848
Waters Corp
WAT
$40.6B
$998K ﹤0.01%
4,032
-215
-5% -$48.7K
AVAV icon
849
AeroVironment
AVAV
$9.59B
$993K ﹤0.01%
11,429
+1,815
+19% +$146K
WSM icon
850
Williams-Sonoma
WSM
$28.5B
$992K ﹤0.01%
19,486
+298
+2% +$15.3K
32 33
34
35 36

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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.