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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
HALO icon
26
Halozyme
HALO
$11.6B
$272M 0.9%
6,362,344
-158,182
-2% -$5.69M
TREX icon
27
Trex
TREX
$5.07B
$265M 0.88%
3,169,429
-669,298
-17% -$51.2M
SEDG icon
28
SolarEdge
SEDG
$2.05B
$265M 0.88%
829,337
-203,541
-20% -$56.3M
BJ icon
29
BJs Wholesale Club
BJ
$12B
$265M 0.88%
7,096,457
+421,105
+6% +$16.8M
AZTA icon
30
Azenta
AZTA
$1.46B
$261M 0.87%
3,839,521
-9,234
-0.2% -$576K
VCYT icon
31
Veracyte
VCYT
$3.73B
$255M 0.85%
5,207,939
-473,150
-8% -$21.9M
HQY icon
32
HealthEquity
HQY
$8.83B
$255M 0.85%
3,654,363
+4,274
+0.1% +$266K
CABO icon
33
Cable One
CABO
$192M
$243M 0.81%
109,133
-3,275
-3% -$6.48M
PEN icon
34
Penumbra
PEN
$12.9B
$234M 0.78%
1,336,263
+108,878
+9% +$23.9M
LYV icon
35
Live Nation Entertainment
LYV
$42.7B
$234M 0.78%
3,182,250
-126,699
-4% -$8M
TECH icon
36
Bio-Techne
TECH
$11.2B
$232M 0.77%
+2,923,168
New +$212M
PODD icon
37
Insulet
PODD
$10B
$231M 0.77%
905,235
-31,604
-3% -$7.84M
RAMP icon
38
LiveRamp
RAMP
$2.3B
$231M 0.77%
3,155,880
+514,428
+19% +$32.8M
STE icon
39
Steris
STE
$23.2B
$229M 0.76%
1,206,877
-32,507
-3% -$6.07M
BLDR icon
40
Builders FirstSource
BLDR
$8.08B
$223M 0.74%
5,462,733
+2,150,702
+65% +$76.2M
AXON
41
Axon Enterprise
AXON
$51.7B
$222M 0.74%
1,808,503
+73,683
+4% +$8.45M
MA icon
42
Mastercard
MA
$492B
$220M 0.73%
617,530
-80,848
-12% -$26.9M
AMED
43
DELISTED
Amedisys
AMED
$220M 0.73%
750,513
-9,552
-1% -$2.45M
HELE icon
44
Helen of Troy
HELE
$682M
$218M 0.73%
983,032
+72,590
+8% +$15M
PYPL icon
45
PayPal
PYPL
$50.5B
$213M 0.71%
908,697
-152,075
-14% -$31.5M
BFAM icon
46
Bright Horizons
BFAM
$3.76B
$213M 0.71%
1,229,172
-316,602
-20% -$51.8M
AVLR
47
DELISTED
Avalara, Inc.
AVLR
$212M 0.71%
1,287,977
-13,042
-1% -$2.09M
GDDY icon
48
GoDaddy
GDDY
$11.5B
$211M 0.7%
2,541,286
+16,686
+0.7% +$1.31M
TEAM icon
49
Atlassian
TEAM
$39.1B
$209M 0.7%
895,475
-65,614
-7% -$13.9M
CCJ icon
50
Cameco
CCJ
$43B
$207M 0.69%
15,410,690
-19,784
-0.1% -$211K
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.