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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
MCHP icon
201
Microchip Technology
MCHP
$43.4B
$22.1M 0.07%
319,828
-83,470
-21% -$5.2M
CNMD icon
202
CONMED
CNMD
$1.5B
$21.8M 0.07%
194,762
-3,846
-2% -$364K
LPSN icon
203
LivePerson
LPSN
$35.4M
$21.7M 0.07%
23,261
+2,336
+11% +$2.01M
GNMK
204
DELISTED
GenMark Diagnostics, Inc
GNMK
$21.4M 0.07%
1,467,156
+400,599
+38% +$5.31M
USPH icon
205
US Physical Therapy
USPH
$1.24B
$20.8M 0.07%
172,686
+16,647
+11% +$1.68M
AORT icon
206
Artivion
AORT
$1.39B
$20.7M 0.07%
878,473
+85,843
+11% +$1.74M
FMC icon
207
FMC
FMC
$1.27B
$20.7M 0.07%
180,099
+112,927
+168% +$12.6M
EXAS
208
DELISTED
Exact Sciences
EXAS
$20.7M 0.07%
156,019
-2,030,978
-93% -$246M
ASR icon
209
Grupo Aeroportuario del Sureste
ASR
$8.18B
$20.5M 0.07%
124,518
-8,124
-6% -$1.14M
AERI
210
DELISTED
Aerie Pharmaceuticals
AERI
$20.4M 0.07%
1,512,041
+92,359
+7% +$1.12M
FORR icon
211
Forrester Research
FORR
$224M
$20.3M 0.07%
485,531
+48,355
+11% +$1.93M
PRCH icon
212
Porch Group
PRCH
$1.88B
$20.2M 0.07%
1,413,876
+284,466
+25% +$3.18M
LPRO
213
DELISTED
Open Lending Corp
LPRO
$19.5M 0.06%
557,926
-251,720
-31% -$7.32M
COLD icon
214
Americold
COLD
$4.29B
$18.7M 0.06%
499,716
-56,625
-10% -$2.04M
WTS icon
215
Watts Water Technologies
WTS
$12.8B
$18.3M 0.06%
150,536
-21,718
-13% -$2.49M
CW icon
216
Curtiss-Wright
CW
$26.3B
$18.2M 0.06%
156,490
-3,084
-2% -$326K
CIGI icon
217
Colliers International
CIGI
$5.32B
$18.2M 0.06%
204,012
-39,313
-16% -$3.14M
ELS icon
218
Equity Lifestyle Properties
ELS
$12.6B
$18M 0.06%
284,500
+123,275
+76% +$7.6M
SIGI icon
219
Selective Insurance
SIGI
$5.64B
$17.8M 0.06%
265,250
-5,225
-2% -$313K
BLD
220
DELISTED
TopBuild
BLD
$17.7M 0.06%
96,203
-1,899
-2% -$336K
ROCK icon
221
Gibraltar Industries
ROCK
$1.48B
$17.6M 0.06%
244,826
-16,606
-6% -$1.11M
DECK icon
222
Deckers Outdoor
DECK
$12.6B
$17.5M 0.06%
366,480
-7,164
-2% -$318K
HWC icon
223
Hancock Whitney
HWC
$6.38B
$17.5M 0.06%
514,802
-10,114
-2% -$273K
LAUR icon
224
Laureate Education
LAUR
$5.19B
$17.3M 0.06%
1,188,576
+116,913
+11% +$1.65M
WINA icon
225
Winmark
WINA
$1.26B
$17M 0.06%
91,651
+76,676
+512% +$13.6M
7 8
9
10 11

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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.