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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
MDB icon
51
MongoDB
MDB
$35.3B
$205M 0.68%
572,166
-24,894
-4% -$6.95M
AAP icon
52
Advance Auto Parts
AAP
$3.23B
$205M 0.68%
1,301,101
-74,238
-5% -$11.5M
TFX icon
53
Teleflex
TFX
$5.91B
$203M 0.68%
493,633
-34,446
-7% -$12.7M
LGND icon
54
Ligand Pharmaceuticals
LGND
$5.83B
$203M 0.68%
3,271,795
+233,510
+8% +$13.3M
VRNS icon
55
Varonis Systems
VRNS
$4.81B
$203M 0.67%
3,714,999
-133,629
-3% -$5.8M
AZPN
56
DELISTED
ASPEN TECHNOLOGY INC
AZPN
$200M 0.67%
1,536,148
-39,220
-2% -$5.11M
GLOB icon
57
Globant
GLOB
$1.65B
$198M 0.66%
911,633
-182,937
-17% -$35.4M
ZD icon
58
Ziff Davis
ZD
$1.89B
$198M 0.66%
2,327,508
-33,511
-1% -$2.43M
ZNGA
59
DELISTED
ZYNGA INC. CL A COMMON
ZNGA
$193M 0.64%
19,590,062
-5,693,562
-23% -$51.2M
GNRC icon
60
Generac Holdings
GNRC
$13.1B
$191M 0.63%
838,600
-225,836
-21% -$48.6M
MMSI icon
61
Merit Medical Systems
MMSI
$5.4B
$188M 0.63%
3,387,365
+2,414,401
+248% +$125M
ABMD
62
DELISTED
Abiomed Inc
ABMD
$184M 0.61%
566,714
-1,496
-0.3% -$414K
TXG icon
63
10x Genomics
TXG
$7.44B
$182M 0.6%
+1,282,261
New +$186M
HDB icon
64
HDFC Bank
HDB
$119B
$178M 0.59%
4,916,780
+223,862
+5% +$7.14M
TDY icon
65
Teledyne Technologies
TDY
$31.7B
$177M 0.59%
452,442
-153,962
-25% -$55.2M
EYE icon
66
National Vision
EYE
$1.62B
$176M 0.59%
3,890,597
-714,356
-16% -$31.1M
FSV icon
67
FirstService
FSV
$6.2B
$175M 0.58%
1,278,033
-57,559
-4% -$7.75M
WOLF icon
68
Wolfspeed
WOLF
$1.66B
$174M 0.58%
1,647,107
-375,831
-19% -$30.2M
UNH icon
69
UnitedHealth
UNH
$363B
$174M 0.58%
495,111
-74,227
-13% -$24.9M
ARES icon
70
Ares Management
ARES
$31.9B
$173M 0.58%
3,685,378
-51,413
-1% -$2.33M
FCFS icon
71
FirstCash
FCFS
$9.22B
$164M 0.55%
2,343,115
+37,023
+2% +$2.35M
ULTA icon
72
Ulta Beauty
ULTA
$23.1B
$161M 0.54%
561,664
-59,153
-10% -$15M
NATI
73
DELISTED
National Instruments Corp
NATI
$159M 0.53%
3,609,062
-45,274
-1% -$1.69M
BURL icon
74
Burlington
BURL
$22.3B
$158M 0.53%
605,192
-20,436
-3% -$4.55M
ZEN
75
DELISTED
ZENDESK INC
ZEN
$158M 0.53%
1,105,653
+975,127
+747% +$121M
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.