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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
+1.57%
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
$23.4B
AUM Growth
-$452M
Cap. Flow
-$478M
Cap. Flow %
-2.05%
Top 10 Hldgs %
20.73%
Holding
398
New
26
Increased
153
Reduced
172
Closed
41

Top Buys

Rank Stock Value
1
IAA
IAA, Inc. Common Stock
IAA
+$134M
2
SPY icon
State Street SPDR S&P 500 ETF Trust
SPY
+$128M
3
WWE
World Wrestling Entertainment
WWE
+$112M
4
PFPT
Proofpoint, Inc.
PFPT
+$102M
5
PRSP
Perspecta Inc. Common Stock
PRSP
+$97.8M

Top Sells

Rank Stock Value
1
RCI icon
Rogers Communications
RCI
+$201M
2
CSGP icon
CoStar Group
CSGP
+$173M
3
CPRT icon
Copart
CPRT
+$156M
4
GWR
Genesee & Wyoming Inc.
GWR
+$147M
5
DPZ icon
Domino's
DPZ
+$137M

Sector Composition

Rank Sector Weight
1 Technology 20.24%
2 Healthcare 13.8%
3 Consumer Discretionary 13.77%
4 Industrials 13.46%
5 Financials 13.14%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
GKOS icon
51
Glaukos
GKOS
$10.7B
$150M 0.64%
2,393,059
-19,963
-0.8% -$1.41M
FSV icon
52
FirstService
FSV
$6.33B
$150M 0.64%
1,458,292
+32,065
+2% +$3.27M
MSFT icon
53
Microsoft
MSFT
$3.72T
$148M 0.63%
1,064,148
-31,934
-3% -$4.39M
NBIS
54
Nebius Group N.V.
NBIS
$48.3B
$145M 0.62%
4,146,436
+241,107
+6% +$9.1M
MA icon
55
Mastercard
MA
$495B
$145M 0.62%
533,334
-53,993
-9% -$14.9M
RBA icon
56
RB Global
RBA
$16.8B
$138M 0.59%
3,470,567
+29,992
+0.9% +$1.11M
ABMD
57
DELISTED
Abiomed Inc
ABMD
$133M 0.57%
748,807
-66,717
-8% -$14.4M
LGND icon
58
Ligand Pharmaceuticals
LGND
$5.78B
$133M 0.57%
2,141,837
+703,353
+49% +$44.2M
AMED
59
DELISTED
Amedisys
AMED
$133M 0.57%
1,012,582
+24,049
+2% +$3.13M
HCSG icon
60
Healthcare Services Group
HCSG
$1.46B
$132M 0.56%
5,438,007
+1,274,062
+31% +$32.2M
UNH icon
61
UnitedHealth
UNH
$367B
$131M 0.56%
603,357
+20,660
+4% +$4.99M
HEI.A icon
62
HEICO Corp Class A
HEI.A
$36.9B
$131M 0.56%
1,341,129
-210,836
-14% -$22.3M
AVLR
63
DELISTED
Avalara, Inc.
AVLR
$130M 0.56%
1,931,019
+45,825
+2% +$3.71M
VIRT icon
64
Virtu Financial
VIRT
$4.93B
$126M 0.54%
7,678,308
+1,910,471
+33% +$38.2M
IAA
65
DELISTED
IAA, Inc. Common Stock
IAA
$124M 0.53%
+2,969,390
New +$134M
W icon
66
Wayfair
W
$14.2B
$121M 0.52%
1,078,483
+348,322
+48% +$44.6M
ECPG icon
67
Encore Capital Group
ECPG
$1.98B
$114M 0.49%
3,406,256
+83,361
+3% +$2.93M
ROG icon
68
Rogers Corp
ROG
$2.39B
$112M 0.48%
818,941
-363,135
-31% -$53.5M
WWE
69
DELISTED
World Wrestling Entertainment
WWE
$112M 0.48%
+1,567,918
New +$112M
ICE icon
70
Intercontinental Exchange
ICE
$84.6B
$110M 0.47%
1,187,126
-13,677
-1% -$1.25M
PFPT
71
DELISTED
Proofpoint, Inc.
PFPT
$108M 0.46%
+837,311
New +$102M
SBNY
72
DELISTED
Signature Bank
SBNY
$108M 0.46%
903,754
+21,779
+2% +$2.64M
CP icon
73
Canadian Pacific Kansas City
CP
$80.5B
$106M 0.45%
2,388,330
-56,640
-2% -$2.66M
PRSP
74
DELISTED
Perspecta Inc. Common Stock
PRSP
$104M 0.45%
+3,997,899
New +$97.8M
ZTS icon
75
Zoetis
ZTS
$31.1B
$104M 0.45%
837,348
-67,196
-7% -$8.11M
1 2
3
4 5

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William Blair Investment Management's Q3 2019 Portfolio in Review

As of Q3 2019, William Blair Investment Management held 398 positions worth $23.4B, down 1.9% from $23.8B the previous quarter. Its ten largest holdings account for 21% of the portfolio.

William Blair Investment Management's Q3 2019 filing shows 26 new, 153 increased, 172 reduced and 41 closed positions. Its largest new stake was IAA, Inc. Common Stock: 2,969,390 shares worth $124M. The largest sale was Rogers Communications, an estimated $201M.

By sector, the portfolio is most concentrated in Technology at 20% of assets, up from 18% a quarter earlier, followed by Healthcare and Consumer Discretionary.

  • William Blair Investment Management's largest Q3 2019 buy was IAA, Inc. Common Stock: 2,969,390 shares worth $124M.
  • William Blair Investment Management added most to State Street SPDR S&P 500 ETF Trust in Q3 2019, an estimated $128M increase.
  • William Blair Investment Management's biggest Q3 2019 reduction was CoStar Group, cutting an estimated $173M.
  • William Blair Investment Management fully exited Rogers Communications in Q3 2019, selling an estimated $201M.
  • William Blair Investment Management's ten largest holdings make up 21% of its $23.4B portfolio in Q3 2019.
  • William Blair Investment Management opened 26 new positions and closed 41 in Q3 2019.
  • William Blair Investment Management's portfolio value fell 1.9% quarter-over-quarter to $23.4B.

Based on William Blair Investment Management's 13F filing for Q3 2019, filed 12 Nov 2019.