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William Blair & Company

William Blair & Company Portfolio holdings

AUM $38.4B
1-Year Est. Return 25.71%
This Fund
S&P 500
This Quarter Est. Return
+13.98%
1 Year Est. Return
+25.71%
3 Year Est. Return
+88.7%
5 Year Est. Return
+104.53%
10 Year Est. Return
+665.86%
AUM
$27.3B
AUM Growth
+$3.7B
Cap. Flow
+$865M
Cap. Flow %
3.17%
Top 10 Hldgs %
25.38%
Holding
1,900
New
178
Increased
749
Reduced
623
Closed
72

Top Buys

Rank Stock Value
1
SPLK
Splunk Inc
SPLK
+$77.8M
2
GD icon
General Dynamics
GD
+$49.6M
3
ROK icon
Rockwell Automation
ROK
+$43.3M
4
LMBS icon
First Trust Exchange-Traded Fund IV First Trust Low Duration Opportunities ETF
LMBS
+$32.3M
5
JPM icon
JPMorgan Chase
JPM
+$30.6M

Top Sells

Rank Stock Value
1
WORK
Slack Technologies, Inc.
WORK
+$24.2M
2
NTRS icon
Northern Trust
NTRS
+$24.1M
3
BKNG icon
Booking.com
BKNG
+$22.5M
4
EXEL icon
Exelixis
EXEL
+$17.5M
5
DOCU
DocuSign
DOCU
+$15M

Sector Composition

Rank Sector Weight
1 Technology 27.82%
2 Healthcare 18.6%
3 Financials 11.15%
4 Consumer Discretionary 10.38%
5 Industrials 8.96%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
TQQQ icon
1601
ProShares UltraPro QQQ
TQQQ
$37.4B
$51K ﹤0.01%
+2,240
New +$42.3K
CQQQ icon
1602
Invesco China Technology ETF
CQQQ
$3.24B
$50K ﹤0.01%
613
+43
+8% +$3.3K
FV icon
1603
First Trust Dorsey Wright Focus 5 ETF
FV
$3.8B
$50K ﹤0.01%
1,234
-3,316
-73% -$124K
HDSN
1604
Hudson Technologies
HDSN
$236M
$50K ﹤0.01%
45,900
– –
FBT icon
1605
First Trust NYSE Arca Biotechnology Index Fund
FBT
$2.81B
$49K ﹤0.01%
293
-29
-9% -$4.71K
BGC icon
1606
BGC Group
BGC
$5.12B
$48K ﹤0.01%
+11,956
New +$41.8K
IAT icon
1607
iShares US Regional Banks ETF
IAT
$687M
$48K ﹤0.01%
1,050
– –
DTH icon
1608
WisdomTree International High Dividend Fund
DTH
$659M
$47K ﹤0.01%
1,258
-110
-8% -$3.87K
GBF icon
1609
iShares Government/Credit Bond ETF
GBF
$128M
$47K ﹤0.01%
370
+100
+37% +$12.5K
IGHG icon
1610
ProShares Investment Grade-Interest Rate Hedged
IGHG
$329M
$46K ﹤0.01%
+604
New +$44.7K
VNM icon
1611
VanEck Vietnam ETF
VNM
$514M
$45K ﹤0.01%
2,555
+72
+3% +$1.14K
GLDG
1612
GoldMining Inc
GLDG
$223M
$44K ﹤0.01%
+20,000
New +$45.9K
EES icon
1613
WisdomTree US SmallCap Earnings Fund
EES
$730M
$43K ﹤0.01%
1,111
– –
IFGL icon
1614
iShares International Developed Real Estate ETF
IFGL
$82.2M
$43K ﹤0.01%
1,600
– –
PBW icon
1615
Invesco WilderHill Clean Energy ETF
PBW
$458M
$41K ﹤0.01%
+400
New +$32.4K
VDE icon
1616
Vanguard Energy ETF
VDE
$10.4B
$40K ﹤0.01%
778
+330
+74% +$15.4K
IBDP
1617
DELISTED
iShares iBonds Dec 2024 Term Corporate ETF
IBDP
$40K ﹤0.01%
+1,500
New +$39.7K
ILCG icon
1618
iShares Morningstar Growth ETF
ILCG
$3.28B
$39K ﹤0.01%
+665
New +$36.9K
PPA icon
1619
Invesco Aerospace & Defense ETF
PPA
$8.74B
$39K ﹤0.01%
580
-500
-46% -$31.1K
BATRK icon
1620
Atlanta Braves Holdings Series B
BATRK
$3.4B
$38K ﹤0.01%
1,534
– –
IGLB icon
1621
iShares 10+ Year Investment Grade Corporate Bond ETF
IGLB
$2.78B
$38K ﹤0.01%
524
– –
IQLT icon
1622
iShares MSCI Intl Quality Factor ETF
IQLT
$14.3B
$37K ﹤0.01%
1,039
– –
ITB icon
1623
iShares US Home Construction ETF
ITB
$2.34B
$37K ﹤0.01%
662
-557
-46% -$31.4K
FCVT icon
1624
First Trust SSI Strategic Convertible Securities ETF
FCVT
$103M
$36K ﹤0.01%
743
– –
ISCG icon
1625
iShares Morningstar Small-Cap Growth ETF
ISCG
$1.02B
$36K ﹤0.01%
720
– –
63 64
65
66 67

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William Blair & Company's Q4 2020 Portfolio in Review

As of Q4 2020, William Blair & Company held 1,900 positions worth $27.3B, up 16% from $23.6B the previous quarter. Its ten largest holdings account for 25% of the portfolio.

William Blair & Company deployed $865M of net new capital in Q4 2020, opening 178 new positions and adding to 749 existing holdings. Its largest new stake was Seagen Inc. Common Stock: 91,539 shares worth $16M.

By sector, the portfolio is most concentrated in Technology at 28% of assets, up from 27% a quarter earlier, followed by Healthcare and Financials.

On the sell side, the largest reduction was Slack Technologies, Inc., an estimated $24.2M trimmed.

  • William Blair & Company's largest Q4 2020 buy was Seagen Inc. Common Stock: 91,539 shares worth $16M.
  • William Blair & Company added most to Splunk Inc in Q4 2020, an estimated $77.8M increase.
  • William Blair & Company's biggest Q4 2020 reduction was Slack Technologies, Inc., cutting an estimated $24.2M.
  • William Blair & Company fully exited Dunkin' Brands Group, Inc. in Q4 2020, selling an estimated $12.1M.
  • William Blair & Company's ten largest holdings make up 25% of its $27.3B portfolio in Q4 2020.
  • William Blair & Company opened 178 new positions and closed 72 in Q4 2020.
  • William Blair & Company's portfolio value rose 16% quarter-over-quarter to $27.3B.

Based on William Blair & Company's 13F filing for Q4 2020, filed 9 Feb 2021.