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William Blair Investment Management

William Blair Investment Management Portfolio holdings

AUM $33.3B
1-Year Est. Return 44.76%
This Fund
S&P 500
This Quarter Est. Return
+25.48%
1 Year Est. Return
+44.76%
3 Year Est. Return
+140.8%
5 Year Est. Return
+166.51%
10 Year Est. Return
+978.6%
AUM
$30B
AUM Growth
+$4.37B
Cap. Flow
-$974M
Cap. Flow %
-3.24%
Top 10 Hldgs %
17.75%
Holding
375
New
32
Increased
99
Reduced
224
Closed
19

Top Buys

Rank Stock Value
1
TECH icon
Bio-Techne
TECH
+$212M
2
TXG icon
10x Genomics
TXG
+$186M
3
TMX
Terminix Global Holdings, Inc.
TMX
+$126M
4
MMSI icon
Merit Medical Systems
MMSI
+$125M
5
ZEN
ZENDESK INC
ZEN
+$121M

Top Sells

Rank Stock Value
1
IRTC icon
iRhythm Holdings
IRTC
+$255M
2
EXAS
Exact Sciences
EXAS
+$246M
3
TRU icon
TransUnion
TRU
+$166M
4
BN icon
Brookfield
BN
+$112M
5
TSM icon
TSMC
TSM
+$104M

Sector Composition

Rank Sector Weight
1 Technology 26.72%
2 Healthcare 19.58%
3 Industrials 13.65%
4 Consumer Discretionary 13.62%
5 Financials 6.72%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
FIS icon
101
Fidelity National Information Services
FIS
$21.7B
$105M 0.35%
741,893
-110,928
-13% -$15.8M
INSP icon
102
Inspire Medical Systems
INSP
$1.68B
$99.3M 0.33%
+528,081
New +$86.3M
ICLR icon
103
Icon
ICLR
$12.8B
$93.5M 0.31%
479,287
-30,197
-6% -$5.9M
TXN icon
104
Texas Instruments
TXN
$254B
$92.3M 0.31%
562,474
-63,946
-10% -$9.94M
AMD icon
105
Advanced Micro Devices
AMD
$794B
$90.6M 0.3%
988,064
-120,294
-11% -$10.4M
MMS icon
106
Maximus
MMS
$2.85B
$88.7M 0.3%
1,211,582
-274,821
-18% -$19.5M
CSGP icon
107
CoStar Group
CSGP
$12.3B
$84.9M 0.28%
919,080
-292,730
-24% -$25.7M
ACN icon
108
Accenture
ACN
$109B
$83.8M 0.28%
320,998
-31,955
-9% -$7.66M
CYBR
109
DELISTED
CyberArk
CYBR
$83.2M 0.28%
515,124
-17,522
-3% -$2.04M
APTV icon
110
Aptiv
APTV
$9.99B
$82.2M 0.27%
630,666
-157,169
-20% -$17.5M
SYK icon
111
Stryker
SYK
$133B
$78.3M 0.26%
319,729
-18,540
-5% -$4.2M
META icon
112
Meta Platforms (Facebook)
META
$1.48T
$78.1M 0.26%
285,982
-76,144
-21% -$20.9M
ATVI
113
DELISTED
Activision Blizzard
ATVI
$72.6M 0.24%
781,496
-99,260
-11% -$8.06M
SBUX icon
114
Starbucks
SBUX
$123B
$69.1M 0.23%
645,707
-55,684
-8% -$5.32M
WDAY icon
115
Workday
WDAY
$42.9B
$68.4M 0.23%
285,396
-141,014
-33% -$31.7M
COST icon
116
Costco
COST
$421B
$67.7M 0.23%
179,625
-49,385
-22% -$18.5M
LRCX icon
117
Lam Research
LRCX
$409B
$66.1M 0.22%
1,400,270
-135,570
-9% -$5.7M
INTU icon
118
Intuit
INTU
$90.8B
$65.4M 0.22%
172,243
-17,352
-9% -$6.09M
STNE icon
119
StoneCo
STNE
$2.42B
$62.6M 0.21%
745,926
+67,790
+10% +$4.54M
ABT icon
120
Abbott
ABT
$192B
$62.1M 0.21%
567,530
-62,289
-10% -$6.77M
EFX icon
121
Equifax
EFX
$21.2B
$62M 0.21%
321,352
-44,813
-12% -$7.53M
FTV icon
122
Fortive
FTV
$18.6B
$59.8M 0.2%
1,121,081
-357,164
-24% -$18.4M
WIX icon
123
WIX.com
WIX
$2.81B
$59.5M 0.2%
238,141
-14,900
-6% -$3.92M
DAR icon
124
Darling Ingredients
DAR
$9.93B
$58.8M 0.2%
1,019,553
-259,286
-20% -$12.4M
MBB icon
125
iShares MBS ETF
MBB
$39B
$56.4M 0.19%
512,120
-17,100
-3% -$1.88M
3 4
5
6 7

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William Blair Investment Management's Q4 2020 Portfolio in Review

As of Q4 2020, William Blair Investment Management held 375 positions worth $30B, up 17% from $25.7B the previous quarter. Its ten largest holdings account for 18% of the portfolio.

William Blair Investment Management withdrew a net $974M in Q4 2020, closing 19 positions and reducing 224 holdings. Its most notable exit was iRhythm Holdings, an estimated $255M position sold in full.

By sector, the portfolio is most concentrated in Technology at 27% of assets, up from 26% a quarter earlier, followed by Healthcare and Industrials.

Against the trend, William Blair Investment Management opened a new position in Bio-Techne worth $232M.

  • William Blair Investment Management's largest Q4 2020 buy was Bio-Techne: 2,923,168 shares worth $232M.
  • William Blair Investment Management added most to Terminix Global Holdings, Inc. in Q4 2020, an estimated $126M increase.
  • William Blair Investment Management's biggest Q4 2020 reduction was Exact Sciences, cutting an estimated $246M.
  • William Blair Investment Management fully exited iRhythm Holdings in Q4 2020, selling an estimated $255M.
  • William Blair Investment Management's ten largest holdings make up 18% of its $30B portfolio in Q4 2020.
  • William Blair Investment Management opened 32 new positions and closed 19 in Q4 2020.
  • William Blair Investment Management's portfolio value rose 17% quarter-over-quarter to $30B.

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