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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
ECL icon
151
Ecolab
ECL
$78.6B
$36.6M 0.12%
169,337
-38,470
-19% -$8.04M
ECPG icon
152
Encore Capital Group
ECPG
$2.1B
$36.6M 0.12%
939,747
-46,363
-5% -$1.69M
RVLV icon
153
Revolve Group
RVLV
$1.69B
$36.4M 0.12%
1,168,310
+73,236
+7% +$1.63M
LQD icon
154
iShares iBoxx $ Investment Grade Corporate Bond ETF
LQD
$32.7B
$36.3M 0.12%
262,460
-22,000
-8% -$3M
HOMB icon
155
Home BancShares
HOMB
$6.22B
$36.2M 0.12%
1,858,630
+90,320
+5% +$1.64M
ILMN icon
156
Illumina
ILMN
$28.9B
$35.8M 0.12%
99,513
-54,906
-36% -$17.5M
GOOG icon
157
Alphabet (Google) Class C
GOOG
$4.19T
$35.6M 0.12%
405,960
+75,980
+23% +$6.41M
LIN icon
158
Linde
LIN
$222B
$34.1M 0.11%
129,256
-51,276
-28% -$12.6M
EWBC icon
159
East-West Bancorp
EWBC
$18.5B
$33.5M 0.11%
659,693
+284,661
+76% +$12.1M
CDNS icon
160
Cadence Design Systems
CDNS
$88.9B
$33.3M 0.11%
243,890
-66,714
-21% -$7.83M
LPLA icon
161
LPL Financial
LPLA
$29.7B
$33.1M 0.11%
317,393
+23,572
+8% +$2.12M
PLOW icon
162
Douglas Dynamics
PLOW
$973M
$33M 0.11%
770,807
+61,229
+9% +$2.35M
HCAT icon
163
Health Catalyst
HCAT
$135M
$32.8M 0.11%
754,437
+74,195
+11% +$2.74M
CRL icon
164
Charles River Laboratories
CRL
$13.7B
$32.7M 0.11%
130,946
-34,866
-21% -$8.3M
NEE icon
165
NextEra Energy
NEE
$179B
$32.5M 0.11%
421,457
-93,311
-18% -$6.98M
LMT icon
166
Lockheed Martin
LMT
$141B
$32.2M 0.11%
90,798
-24,008
-21% -$8.83M
TRHC
167
DELISTED
Tabula Rasa HealthCare, Inc. Common Stock
TRHC
$31.8M 0.11%
741,891
+264,674
+55% +$10M
IAA
168
DELISTED
IAA, Inc. Common Stock
IAA
$31.1M 0.1%
477,890
+34,762
+8% +$2.08M
CDNA icon
169
CareDx
CDNA
$2.45B
$30.1M 0.1%
415,421
-105,194
-20% -$6.1M
MAR icon
170
Marriott International
MAR
$92.8B
$29.8M 0.1%
225,611
-24,275
-10% -$2.77M
PAE
171
DELISTED
PAE Incorporated Class A Common Stock
PAE
$29.7M 0.1%
3,232,430
+319,315
+11% +$2.95M
ALGN icon
172
Align Technology
ALGN
$12.4B
$29.4M 0.1%
54,998
-15,043
-21% -$6.76M
BALL icon
173
Ball Corp
BALL
$16.5B
$29.3M 0.1%
314,002
-287,889
-48% -$26.6M
DLB icon
174
Dolby
DLB
$5.75B
$29M 0.1%
298,971
-131,680
-31% -$10.9M
LAD icon
175
Lithia Motors
LAD
$8.36B
$28.9M 0.1%
98,602
-16,531
-14% -$4.52M
5 6
7
8 9

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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.