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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
+9.46%
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
$25.1B
AUM Growth
+$1.71B
Cap. Flow
-$116M
Cap. Flow %
-0.46%
Top 10 Hldgs %
21.8%
Holding
389
New
32
Increased
133
Reduced
187
Closed
33

Top Buys

Rank Stock Value
1
ZNGA
ZYNGA INC. CL A COMMON
ZNGA
+$140M
2
OLLI icon
Ollie's Bargain Outlet
OLLI
+$120M
3
PLNT icon
Planet Fitness
PLNT
+$101M
4
ETSY icon
Etsy
ETSY
+$98.5M
5
IRTC icon
iRhythm Holdings
IRTC
+$83.7M

Top Sells

Rank Stock Value
1
CVSA
Covista Inc
CVSA
+$163M
2
EWBC icon
East-West Bancorp
EWBC
+$155M
3
MIDD icon
Middleby
MIDD
+$155M
4
IAA
IAA, Inc. Common Stock
IAA
+$124M
5
CBOE icon
Cboe Global Markets
CBOE
+$98.6M

Sector Composition

Rank Sector Weight
1 Technology 22.67%
2 Healthcare 14.68%
3 Consumer Discretionary 14.55%
4 Industrials 12.39%
5 Financials 11.76%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
JLL icon
51
Jones Lang LaSalle
JLL
$16.7B
$148M 0.59%
852,026
+317,757
+59% +$50M
AAP icon
52
Advance Auto Parts
AAP
$3.34B
$148M 0.59%
926,038
+369,905
+67% +$59.3M
AVLR
53
DELISTED
Avalara, Inc.
AVLR
$148M 0.59%
2,021,605
+90,586
+5% +$6.58M
LGND icon
54
Ligand Pharmaceuticals
LGND
$5.78B
$148M 0.59%
2,271,211
+129,374
+6% +$8.65M
BAP icon
55
Credicorp
BAP
$30B
$147M 0.59%
691,944
-62,095
-8% -$13M
ZNGA
56
DELISTED
ZYNGA INC. CL A COMMON
ZNGA
$140M 0.56%
22,861,876
+22,697,372
+13,797% +$140M
LULU icon
57
lululemon athletica
LULU
$14.2B
$140M 0.56%
603,340
+275,613
+84% +$58.7M
HCSG icon
58
Healthcare Services Group
HCSG
$1.46B
$138M 0.55%
5,681,592
+243,585
+4% +$6.03M
CBOE icon
59
Cboe Global Markets
CBOE
$29.6B
$136M 0.54%
1,129,865
-840,814
-43% -$98.6M
VIRT icon
60
Virtu Financial
VIRT
$4.93B
$130M 0.52%
8,114,972
+436,664
+6% +$7.2M
WWE
61
DELISTED
World Wrestling Entertainment
WWE
$128M 0.51%
1,968,038
+400,120
+26% +$25.3M
FSV icon
62
FirstService
FSV
$6.32B
$128M 0.51%
1,372,158
-86,134
-6% -$8.11M
SITE icon
63
SiteOne Landscape Supply
SITE
$4.36B
$127M 0.51%
1,402,542
+71,107
+5% +$6.03M
NBIS
64
Nebius Group N.V.
NBIS
$48.3B
$126M 0.5%
2,897,547
-1,248,889
-30% -$46.6M
OLLI icon
65
Ollie's Bargain Outlet
OLLI
$4.81B
$124M 0.49%
+1,892,527
New +$120M
ADBE icon
66
Adobe
ADBE
$106B
$123M 0.49%
372,297
+30,307
+9% +$8.92M
HEI.A icon
67
HEICO Corp Class A
HEI.A
$37B
$123M 0.49%
1,371,165
+30,036
+2% +$2.86M
SBNY
68
DELISTED
Signature Bank
SBNY
$122M 0.48%
890,052
-13,702
-2% -$1.71M
CP icon
69
Canadian Pacific Kansas City
CP
$80.5B
$119M 0.47%
2,326,020
-62,310
-3% -$2.92M
ECPG icon
70
Encore Capital Group
ECPG
$1.96B
$118M 0.47%
3,323,897
-82,359
-2% -$2.88M
PRSP
71
DELISTED
Perspecta Inc. Common Stock
PRSP
$114M 0.46%
4,325,776
+327,877
+8% +$8.73M
HALO icon
72
Halozyme
HALO
$11.7B
$112M 0.45%
6,331,530
+915,535
+17% +$15.9M
PLNT icon
73
Planet Fitness
PLNT
$3.62B
$112M 0.45%
+1,500,864
New +$101M
PFPT
74
DELISTED
Proofpoint, Inc.
PFPT
$111M 0.44%
968,249
+130,938
+16% +$15.6M
VRNS icon
75
Varonis Systems
VRNS
$4.85B
$111M 0.44%
4,268,301
+3,382,176
+382% +$80.3M
1 2
3
4 5

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William Blair Investment Management's Q4 2019 Portfolio in Review

As of Q4 2019, William Blair Investment Management held 389 positions worth $25.1B, up 7.3% from $23.4B the previous quarter. Its ten largest holdings account for 22% of the portfolio.

William Blair Investment Management's Q4 2019 filing shows 32 new, 133 increased, 187 reduced and 33 closed positions. Its largest new stake was Ollie's Bargain Outlet: 1,892,527 shares worth $124M. The largest sale was Covista Inc, an estimated $163M.

By sector, the portfolio is most concentrated in Technology at 23% of assets, up from 20% a quarter earlier, followed by Healthcare and Consumer Discretionary.

  • William Blair Investment Management's largest Q4 2019 buy was Ollie's Bargain Outlet: 1,892,527 shares worth $124M.
  • William Blair Investment Management added most to ZYNGA INC. CL A COMMON in Q4 2019, an estimated $140M increase.
  • William Blair Investment Management's biggest Q4 2019 reduction was Middleby, cutting an estimated $155M.
  • William Blair Investment Management fully exited Covista Inc in Q4 2019, selling an estimated $163M.
  • William Blair Investment Management's ten largest holdings make up 22% of its $25.1B portfolio in Q4 2019.
  • William Blair Investment Management opened 32 new positions and closed 33 in Q4 2019.
  • William Blair Investment Management's portfolio value rose 7.3% quarter-over-quarter to $25.1B.

Based on William Blair Investment Management's 13F filing for Q4 2019, filed 12 Feb 2020.