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William Blair Investment Management

William Blair Investment Management Portfolio holdings

AUM $30.3B
1-Year Est. Return 33.75%
This Fund
S&P 500
This Quarter Est. Return
+25.48%
1 Year Est. Return
+33.75%
3 Year Est. Return
+108.55%
5 Year Est. Return
+126.9%
10 Year Est. Return
+788.31%
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
TSM icon
1
TSMC
TSM
$2.18T
$1.33B 4.44%
12,232,121
-1,098,832
-8% -$104M
SPY icon
2
State Street SPDR S&P 500 ETF Trust
SPY
$823B
$638M 2.12%
1,706,990
-148,610
-8% -$52.7M
MELI icon
3
Mercado Libre
MELI
$92.3B
$578M 1.92%
344,891
+187
+0.1% +$264K
BWXT icon
4
BWX Technologies
BWXT
$15.6B
$445M 1.48%
7,386,872
-125,360
-2% -$7.22M
SE icon
5
Sea Limited
SE
$69.5B
$415M 1.38%
2,083,794
-58,778
-3% -$10.5M
AMZN icon
6
Amazon
AMZN
$2.96T
$393M 1.31%
2,410,760
-308,180
-11% -$49.2M
EHC icon
7
Encompass Health
EHC
$12.4B
$386M 1.28%
5,865,791
-10,880
-0.2% -$640K
HZNP
8
DELISTED
Horizon Therapeutics Public Limited Company Ordinary Shares
HZNP
$384M 1.28%
5,253,998
-599,224
-10% -$44.5M
LOPE icon
9
Grand Canyon Education
LOPE
$3.98B
$380M 1.27%
4,081,286
+26,095
+0.6% +$2.23M
BCO icon
10
Brink's
BCO
$4.62B
$378M 1.26%
5,248,720
+410,115
+8% +$23.9M
MSFT icon
11
Microsoft
MSFT
$3.71T
$374M 1.25%
1,682,146
+213,201
+15% +$45.8M
NICE icon
12
Nice
NICE
$5.97B
$362M 1.2%
1,276,160
-32,873
-3% -$7.99M
P
13
Everpure Inc
P
$29.9B
$355M 1.18%
15,709,115
-423,947
-3% -$8.12M
ETSY icon
14
Etsy
ETSY
$7.85B
$355M 1.18%
1,992,801
-28,499
-1% -$4.29M
CNI icon
15
Canadian National Railway
CNI
$76.6B
$352M 1.17%
3,199,468
-158,957
-5% -$17.2M
MLM icon
16
Martin Marietta Materials
MLM
$33B
$330M 1.1%
1,161,160
-15,255
-1% -$4.06M
TAL icon
17
TAL Education Group
TAL
$6.87B
$329M 1.09%
4,595,357
-165,868
-3% -$12M
CCK icon
18
Crown Holdings
CCK
$13.1B
$310M 1.03%
3,092,037
-49,526
-2% -$4.55M
ALRM icon
19
Alarm.com
ALRM
$2.85B
$297M 0.99%
2,868,630
-97,928
-3% -$7.11M
EEFT icon
20
Euronet Worldwide
EEFT
$2.7B
$291M 0.97%
2,004,890
-29,319
-1% -$3.41M
MRCY icon
21
Mercury Systems
MRCY
$6.52B
$286M 0.95%
3,249,564
+487,709
+18% +$37.1M
GOOGL icon
22
Alphabet (Google) Class A
GOOGL
$4.33T
$285M 0.95%
3,253,460
-325,520
-9% -$27.4M
NBIS
23
Nebius Group N.V.
NBIS
$47.7B
$285M 0.95%
4,094,008
-120,355
-3% -$7.68M
LULU icon
24
lululemon athletica
LULU
$14.6B
$280M 0.93%
804,427
-39,143
-5% -$13.6M
RBA icon
25
RB Global
RBA
$17.5B
$277M 0.92%
3,979,808
-197,563
-5% -$13.1M
1
2 3 4 5

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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.