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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
TME icon
76
Tencent Music
TME
$13.8B
$157M 0.52%
8,151,828
-133,099
-2% -$2.16M
GWRE icon
77
Guidewire Software
GWRE
$14.4B
$155M 0.52%
1,206,639
-130,277
-10% -$14.9M
VIRT icon
78
Virtu Financial
VIRT
$5.01B
$154M 0.51%
6,137,691
-83,376
-1% -$1.93M
WAL icon
79
Western Alliance Bancorporation
WAL
$9.03B
$151M 0.5%
2,512,849
+1,722,432
+218% +$83.8M
ADBE icon
80
Adobe
ADBE
$102B
$150M 0.5%
299,991
-66,696
-18% -$32.2M
NKE icon
81
Nike
NKE
$60.4B
$148M 0.49%
1,047,264
-170,736
-14% -$22.6M
ENTG icon
82
Entegris
ENTG
$24.7B
$147M 0.49%
1,534,011
-42,133
-3% -$3.68M
TMX
83
DELISTED
Terminix Global Holdings, Inc.
TMX
$144M 0.48%
2,823,913
+2,605,953
+1,196% +$126M
CRM icon
84
Salesforce
CRM
$157B
$141M 0.47%
635,752
+42,104
+7% +$10.2M
LECO icon
85
Lincoln Electric
LECO
$15.7B
$141M 0.47%
1,216,839
+8,936
+0.7% +$979K
NFE icon
86
New Fortress Energy
NFE
$93M
$138M 0.46%
2,584,086
+2,356,153
+1,034% +$108M
ACHC icon
87
Acadia Healthcare
ACHC
$2.97B
$136M 0.45%
+2,706,740
New +$108M
BAH icon
88
Booz Allen Hamilton
BAH
$9.43B
$132M 0.44%
1,512,427
-806,760
-35% -$68.6M
PFPT
89
DELISTED
Proofpoint, Inc.
PFPT
$128M 0.43%
937,307
-11,165
-1% -$1.22M
INSM icon
90
Insmed
INSM
$29B
$123M 0.41%
3,703,626
+1,316,630
+55% +$48.1M
CPRT icon
91
Copart
CPRT
$26.9B
$121M 0.4%
3,794,640
-762,396
-17% -$22.2M
NOVT icon
92
Novanta
NOVT
$6.39B
$120M 0.4%
1,015,206
+4,625
+0.5% +$540K
MASI
93
DELISTED
Masimo
MASI
$118M 0.39%
439,444
-5,744
-1% -$1.43M
EL icon
94
Estee Lauder
EL
$31.9B
$116M 0.39%
436,246
-49,421
-10% -$11.9M
STEM icon
95
Stem
STEM
$50.2M
$112M 0.37%
+274,692
New +$69.2M
HEI.A icon
96
HEICO Corp Class A
HEI.A
$37.9B
$111M 0.37%
946,065
-9,205
-1% -$1M
BAP icon
97
Credicorp
BAP
$29.8B
$111M 0.37%
674,259
+88,018
+15% +$12.2M
BPMC
98
DELISTED
Blueprint Medicines
BPMC
$110M 0.37%
+982,814
New +$104M
TWST icon
99
Twist Bioscience
TWST
$7.78B
$106M 0.35%
751,255
+454,483
+153% +$50.4M
ZTS icon
100
Zoetis
ZTS
$30.4B
$105M 0.35%
637,297
-103,935
-14% -$16.9M
2 3
4
5 6

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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.