We are live on ! Find out more
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
OC icon
226
Owens Corning
OC
$12.3B
$16.8M 0.06%
+221,356
New +$16.1M
VERX icon
227
Vertex
VERX
$2B
$16.7M 0.06%
+477,930
New +$13M
KO icon
228
Coca-Cola
KO
$373B
$16.6M 0.06%
302,741
+80,727
+36% +$4.17M
RDN icon
229
Radian Group
RDN
$4.87B
$16.4M 0.05%
810,211
-15,953
-2% -$298K
PDFS icon
230
PDF Solutions
PDFS
$2.19B
$16.1M 0.05%
744,673
+111,334
+18% +$2.34M
KC
231
Kingsoft Cloud Holdings
KC
$3.52B
$15.7M 0.05%
361,468
-64,284
-15% -$2.38M
SHO icon
232
Sunstone Hotel Investors
SHO
$2.01B
$15.6M 0.05%
1,380,235
+503,974
+58% +$4.82M
COUP
233
DELISTED
Coupa Software Incorporated
COUP
$15.6M 0.05%
46,109
-12,664
-22% -$3.92M
UNF icon
234
Unifirst Corp
UNF
$5.24B
$15.4M 0.05%
72,939
-1,446
-2% -$275K
SLP icon
235
Simulations Plus
SLP
$371M
$15.2M 0.05%
211,418
-67,655
-24% -$4.49M
ITGR icon
236
Integer Holdings
ITGR
$4.25B
$15.1M 0.05%
186,573
-3,692
-2% -$259K
LGTY
237
DELISTED
Logility Supply Chain Solutions, Inc. Common Stock
LGTY
$15.1M 0.05%
878,050
+85,851
+11% +$1.37M
COR
238
DELISTED
Coresite Realty Corporation
COR
$14.9M 0.05%
118,775
-14,467
-11% -$1.79M
FND icon
239
Floor & Decor
FND
$6.32B
$14.9M 0.05%
160,144
-43,727
-21% -$3.65M
SPB icon
240
Spectrum Brands
SPB
$2.03B
$14.8M 0.05%
186,793
+6,020
+3% +$395K
SITM icon
241
SiTime
SITM
$20.5B
$14.7M 0.05%
131,749
-192,859
-59% -$18.3M
GTLS
242
DELISTED
Chart Industries
GTLS
$14.6M 0.05%
+123,848
New +$12M
Z icon
243
Zillow
Z
$7.48B
$14.5M 0.05%
+111,843
New +$12.4M
CNO icon
244
CNO Financial Group
CNO
$5.02B
$14.5M 0.05%
652,161
-12,846
-2% -$262K
WTFC icon
245
Wintrust Financial
WTFC
$11B
$14.2M 0.05%
233,044
+28,537
+14% +$1.54M
SBCF icon
246
Seacoast Banking Corp of Florida
SBCF
$3.44B
$14.2M 0.05%
482,729
-9,523
-2% -$231K
MUSA icon
247
Murphy USA
MUSA
$10.1B
$14.2M 0.05%
108,478
+21,533
+25% +$2.77M
OGS icon
248
ONE Gas
OGS
$5.05B
$14.2M 0.05%
184,657
-3,649
-2% -$276K
MTD icon
249
Mettler-Toledo International
MTD
$28.8B
$13.9M 0.05%
12,226
-3,367
-22% -$3.69M
EPAM icon
250
EPAM Systems
EPAM
$5.17B
$13.8M 0.05%
38,465
-46,551
-55% -$15.5M
8 9
10
11 12

Similar funds

BAMCO Inc
BAMCO Inc New York $33.1B AUM 11.16% 1-Year Est. Return
GAM
Gotham Asset Management New York $32.7B AUM 27.65% 1-Year Est. Return
Kayne Anderson Rudnick Investment Management
Kayne Anderson Rudnick Investment Management Los Angeles, California $34B AUM 6.31% 1-Year Est. Return
Hotchkis & Wiley Capital Management
Hotchkis & Wiley Capital Management Los Angeles, California $32.4B AUM 17.21% 1-Year Est. Return
Public Sector Pension Investment Board (PSP Investments)
Public Sector Pension Investment Board (PSP Investments) Montreal, Quebec, Canada $32.1B AUM 31.84% 1-Year Est. Return
VIA
Vanguard Investments Australia Victoria, Australia $34.6B AUM
Chevy Chase Trust
Chevy Chase Trust Bethesda, Maryland $34.7B AUM 29.45% 1-Year Est. Return
Treasurer of the State of North Carolina
Treasurer of the State of North Carolina Raleigh, North Carolina $31.8B AUM 28.93% 1-Year Est. Return

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.