We are live on ! Find out more
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
SIVB
351
DELISTED
SVB Financial Group
SIVB
$766K ﹤0.01%
1,975
-98,781
-98% -$32M
EFA icon
352
iShares MSCI EAFE ETF
EFA
$80.2B
$470K ﹤0.01%
+6,438
New +$440K
IWP icon
353
iShares Russell Mid-Cap Growth ETF
IWP
$21B
$184K ﹤0.01%
1,790
-780
-30% -$74.2K
ELD icon
354
WisdomTree Emerging Markets Local Debt Fund
ELD
$143M
$54K ﹤0.01%
1,540
+70
+5% +$2.33K
EMB icon
355
iShares JPMorgan USD Emerging Markets Bond ETF
EMB
$14.9B
$51K ﹤0.01%
440
+20
+5% +$2.27K
IWF icon
356
iShares Russell 1000 Growth ETF
IWF
$128B
$20K ﹤0.01%
+332
New +$18.9K
BN icon
357
Brookfield
BN
$110B
– –
-6,304,433
Closed -$112M
IRTC icon
358
iRhythm Holdings
IRTC
$4.13B
– –
-1,071,182
Closed -$255M
JPM icon
359
JPMorgan Chase
JPM
$971B
– –
-467,224
Closed -$45M
LW icon
360
Lamb Weston
LW
$7.3B
– –
-1,251,286
Closed -$82.9M
QDEL icon
361
QuidelOrtho
QDEL
$1.02B
– –
-17,322
Closed -$3.8M
ROG icon
362
Rogers Corp
ROG
$2.48B
– –
-609,017
Closed -$59.7M
ROST icon
363
Ross Stores
ROST
$79.6B
– –
-164,265
Closed -$15.3M
SAP icon
364
SAP
SAP
$236B
– –
-33,941
Closed -$5.29M
STEP icon
365
StepStone Group
STEP
$3.96B
– –
-519,417
Closed -$13.8M
TALO icon
366
Talos Energy
TALO
$2.59B
– –
-348,172
Closed -$2.25M
TRU icon
367
TransUnion
TRU
$15.2B
– –
-1,975,946
Closed -$166M
WEX icon
368
WEX
WEX
$6.48B
– –
-82,698
Closed -$11.5M
WLDN icon
369
Willdan Group
WLDN
$1.29B
– –
-363,580
Closed -$9.28M
TXNM
370
TXNM Energy Inc
TXNM
$5.91B
– –
-318,926
Closed -$13.2M
INVX
371
Innovex International
INVX
$2.13B
– –
-94,785
Closed -$2.35M
JBTM
372
JBT Marel
JBTM
$6.15B
– –
-187,305
Closed -$17.2M
IPHI
373
DELISTED
INPHI CORPORATION
IPHI
– –
-255,403
Closed -$28.7M
DNKN
374
DELISTED
Dunkin' Brands Group, Inc.
DNKN
– –
-195,405
Closed -$16M
AAN.A
375
DELISTED
The Aaron's Company Inc Class A
AAN.A
– –
-697,195
Closed -$39.5M
11 12 13 14
15

Similar funds

BAMCO Inc
BAMCO Inc New York $33.1B AUM 11.16% 1-Year Est. Return
GAM
Gotham Asset Management New York $32.7B AUM 27.65% 1-Year Est. Return
Kayne Anderson Rudnick Investment Management
Kayne Anderson Rudnick Investment Management Los Angeles, California $34B AUM 6.31% 1-Year Est. Return
Hotchkis & Wiley Capital Management
Hotchkis & Wiley Capital Management Los Angeles, California $32.4B AUM 17.21% 1-Year Est. Return
Public Sector Pension Investment Board (PSP Investments)
Public Sector Pension Investment Board (PSP Investments) Montreal, Quebec, Canada $32.1B AUM 31.84% 1-Year Est. Return
VIA
Vanguard Investments Australia Victoria, Australia $34.6B AUM
Chevy Chase Trust
Chevy Chase Trust Bethesda, Maryland $34.7B AUM 29.45% 1-Year Est. Return
Treasurer of the State of North Carolina
Treasurer of the State of North Carolina Raleigh, North Carolina $31.8B AUM 28.93% 1-Year Est. Return

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.