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William Blair & Company

William Blair & Company Portfolio holdings

AUM $34.9B
1-Year Est. Return 18.88%
This Fund
S&P 500
This Quarter Est. Return
+8.27%
1 Year Est. Return
+18.88%
3 Year Est. Return
+73.84%
5 Year Est. Return
+90.13%
10 Year Est. Return
+563.35%
AUM
$31.9B
AUM Growth
+$2.51B
Cap. Flow
+$830M
Cap. Flow %
2.6%
Top 10 Hldgs %
23.75%
Holding
2,051
New
174
Increased
889
Reduced
606
Closed
88

Top Buys

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$66.8M
2
PODD icon
Insulet
PODD
+$47M
3
XMTR icon
Xometry
XMTR
+$44.1M
4
SPY icon
State Street SPDR S&P 500 ETF Trust
SPY
+$43.7M
5
AON icon
Aon
AON
+$36.1M

Top Sells

Rank Stock Value
1
PYPL icon
PayPal
PYPL
+$73.8M
2
ATVI
Activision Blizzard
ATVI
+$46.9M
3
OSH
Oak Street Health, Inc.
OSH
+$43.6M
4
DIS icon
Walt Disney
DIS
+$34M
5
PGR icon
Progressive
PGR
+$32.6M

Sector Composition

Rank Sector Weight
1 Technology 26.2%
2 Healthcare 19.21%
3 Financials 10.7%
4 Consumer Discretionary 10.6%
5 Industrials 10.38%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
Z icon
2001
Zillow
Z
$7.56B
– –
-2,642
Closed -$233K
ZG icon
2002
Zillow
ZG
$7.63B
– –
-253
Closed -$22K
ZIP icon
2003
ZipRecruiter
ZIP
$423M
– –
-10,950
Closed -$302K
PMD
2004
DELISTED
Psychemedics Corporation
PMD
– –
-13,500
Closed -$113K
TRVN
2005
DELISTED
Trevena, Inc.
TRVN
– –
-40
Closed -$31K
BFX
2006
DELISTED
BowFlex Inc.
BFX
– –
-34,050
Closed -$317K
ARAV
2007
DELISTED
Aravive, Inc. Common Stock
ARAV
– –
-43,000
Closed -$160K
TDW.WS.A
2008
DELISTED
Tidewater Inc. Series A Warrants to purchase shares of common stock (expiring July 31, 2023)
TDW.WS.A
– –
-43
Closed –
TDW.WS.B
2009
DELISTED
Tidewater Inc. Series B Warrants to purchase shares of common stock (expiring July 31, 2023)
TDW.WS.B
– –
-46
Closed –
AERI
2010
DELISTED
Aerie Pharmaceuticals
AERI
– –
-13,623
Closed -$155K
MANT
2011
DELISTED
Mantech International Corp
MANT
– –
-8,204
Closed -$623K
AGT
2012
DELISTED
iShares MSCI Argentina and Global Exposure ETF
AGT
– –
-40
Closed -$1K
DISCK
2013
DELISTED
Discovery, Inc. Series C Common Stock
DISCK
– –
-5,432
Closed -$132K
ASTRW
2014
DELISTED
Astra Space, Inc. Warrant
ASTRW
– –
-131,447
Closed -$312K
LMRK
2015
DELISTED
Landmark Infrastructure Partners LP Common Units
LMRK
– –
-20,900
Closed -$342K
KSU
2016
DELISTED
Kansas City Southern
KSU
– –
-4,564
Closed -$1.24M
MDP
2017
DELISTED
Meredith Corporation
MDP
– –
-6,000
Closed -$334K
DDMX
2018
DELISTED
DD3 Acquisition Corp. II Class A Common Stock
DDMX
– –
-153,768
Closed -$1.52M
XLRN
2019
DELISTED
Acceleron Pharma
XLRN
– –
-1,323
Closed -$228K
FLXN
2020
DELISTED
Flexion Therapeutics, Inc.
FLXN
– –
-160,399
Closed -$978K
TRIL
2021
DELISTED
Trillium Therapeutics Inc.
TRIL
– –
-25,150
Closed -$442K
MDLA
2022
DELISTED
Medallia, Inc.
MDLA
– –
-157,491
Closed -$5.33M
IBDM
2023
DELISTED
iShares iBonds Dec 2021 Term Corporate ETF
IBDM
– –
-50,825
Closed -$1.26M
IBMJ
2024
DELISTED
iShares iBonds Dec 2021 Term Muni Bond ETF
IBMJ
– –
-7,950
Closed -$203K
CIT
2025
DELISTED
CIT Group Inc.
CIT
– –
-28,044
Closed -$1.46M
78 79 80
81
82

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William Blair & Company's Q4 2021 Portfolio in Review

As of Q4 2021, William Blair & Company held 2,051 positions worth $31.9B, up 8.5% from $29.4B the previous quarter. Its ten largest holdings account for 24% of the portfolio.

William Blair & Company's Q4 2021 filing shows 174 new, 889 increased, 606 reduced and 88 closed positions. Its largest new stake was Portillo's: 759,814 shares worth $28.5M. The largest sale was PayPal, an estimated $73.8M.

By sector, the portfolio is most concentrated in Technology at 26% of assets, up from 26% a quarter earlier, followed by Healthcare and Financials.

  • William Blair & Company's largest Q4 2021 buy was Portillo's: 759,814 shares worth $28.5M.
  • William Blair & Company added most to Amazon in Q4 2021, an estimated $66.8M increase.
  • William Blair & Company's biggest Q4 2021 reduction was PayPal, cutting an estimated $73.8M.
  • William Blair & Company fully exited Asana in Q4 2021, selling an estimated $6.06M.
  • William Blair & Company's ten largest holdings make up 24% of its $31.9B portfolio in Q4 2021.
  • William Blair & Company opened 174 new positions and closed 88 in Q4 2021.
  • William Blair & Company's portfolio value rose 8.5% quarter-over-quarter to $31.9B.

Based on William Blair & Company's 13F filing for Q4 2021, filed 14 Feb 2022.