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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
QDEL icon
101
QuidelOrtho
QDEL
$1.02B
$60.5M 0.22%
336,930
+70,437
+26% +$15.7M
BX icon
102
Blackstone
BX
$110B
$58.1M 0.21%
896,473
+199,745
+29% +$11.6M
MDT icon
103
Medtronic
MDT
$116B
$58M 0.21%
494,891
-8,036
-2% -$885K
INFO
104
DELISTED
IHS Markit Ltd. Common Shares
INFO
$57.4M 0.21%
638,672
+29,807
+5% +$2.58M
VBK icon
105
Vanguard Morningstar Small-Cap Growth ETF
VBK
$24.8B
$56.7M 0.21%
212,008
-4,734
-2% -$1.14M
ADP icon
106
Automatic Data Processing
ADP
$107B
$56.7M 0.21%
321,659
-6,562
-2% -$1.08M
QQQ icon
107
Invesco QQQ Trust
QQQ
$481B
$55.7M 0.2%
177,525
+36,427
+26% +$10.7M
GD icon
108
General Dynamics
GD
$107B
$55M 0.2%
369,581
+339,590
+1,132% +$49.6M
RMD icon
109
ResMed
RMD
$32.8B
$54.9M 0.2%
258,188
+2,167
+0.8% +$432K
MRK icon
110
Merck
MRK
$328B
$54.5M 0.2%
698,785
+83,608
+14% +$6.39M
VEU icon
111
Vanguard FTSE All-World ex-US ETF
VEU
$70.5B
$54.4M 0.2%
931,372
+14,260
+2% +$777K
CHKP icon
112
Check Point Software Technologies
CHKP
$13.2B
$53.9M 0.2%
405,583
-24,906
-6% -$3.04M
ROK icon
113
Rockwell Automation
ROK
$50.1B
$53.8M 0.2%
214,373
+177,089
+475% +$43.3M
KO icon
114
Coca-Cola
KO
$373B
$53.7M 0.2%
979,727
+304,512
+45% +$15.7M
DLB icon
115
Dolby
DLB
$5.75B
$53.5M 0.2%
551,289
-36,925
-6% -$3.05M
WEX icon
116
WEX
WEX
$6.48B
$53.4M 0.2%
262,514
-66,215
-20% -$11.1M
BA icon
117
Boeing
BA
$183B
$53M 0.19%
247,594
+35,705
+17% +$6.86M
LOW icon
118
Lowe's Companies
LOW
$121B
$52.7M 0.19%
328,608
+8,726
+3% +$1.42M
P
119
Everpure Inc
P
$37B
$52.7M 0.19%
2,331,197
-256,469
-10% -$4.92M
TXN icon
120
Texas Instruments
TXN
$253B
$51.9M 0.19%
316,133
+14,159
+5% +$2.2M
LLY icon
121
Eli Lilly
LLY
$1.09T
$51.2M 0.19%
303,165
-17,507
-5% -$2.61M
AXP icon
122
American Express
AXP
$232B
$51.1M 0.19%
423,021
+95,476
+29% +$10.6M
IRTC icon
123
iRhythm Holdings
IRTC
$4.13B
$50.4M 0.18%
212,608
+44,898
+27% +$10.2M
PLMR icon
124
Palomar
PLMR
$3.36B
$49.1M 0.18%
552,385
+11,239
+2% +$945K
LMBS icon
125
First Trust Exchange-Traded Fund IV First Trust Low Duration Opportunities ETF
LMBS
$6.39B
$47.9M 0.18%
930,228
+626,495
+206% +$32.3M
3 4
5
6 7

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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.