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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
WPC icon
476
W.P. Carey
WPC
$16.3B
$4.04M 0.01%
58,498
+87
+0.1% +$5.81K
MKTX icon
477
MarketAxess Holdings
MKTX
$5.72B
$4.03M 0.01%
7,063
-816
-10% -$444K
CP icon
478
Canadian Pacific Kansas City
CP
$82.4B
$3.97M 0.01%
57,265
-3,055
-5% -$199K
CACC icon
479
Credit Acceptance
CACC
$6.03B
$3.95M 0.01%
11,416
-249
-2% -$81.3K
PDP icon
480
Invesco Dorsey Wright Momentum ETF
PDP
$1.53B
$3.89M 0.01%
44,360
-40
-0.1% -$3.28K
URI icon
481
United Rentals
URI
$69.7B
$3.89M 0.01%
16,780
+1,393
+9% +$294K
LHX icon
482
L3Harris
LHX
$54B
$3.89M 0.01%
20,579
+380
+2% +$69.5K
D icon
483
Dominion Energy
D
$60B
$3.88M 0.01%
51,639
-10,984
-18% -$873K
OEF icon
484
iShares S&P 100 ETF
OEF
$20.6B
$3.88M 0.01%
22,594
+12,710
+129% +$2.08M
MDLA
485
DELISTED
Medallia, Inc.
MDLA
$3.88M 0.01%
116,731
+14,635
+14% +$467K
LUV icon
486
Southwest Airlines
LUV
$22B
$3.88M 0.01%
83,158
+736
+0.9% +$31.9K
DLR icon
487
Digital Realty Trust
DLR
$73.5B
$3.87M 0.01%
27,739
-1,422
-5% -$203K
MELI icon
488
Mercado Libre
MELI
$93.9B
$3.87M 0.01%
2,308
-199
-8% -$281K
ES icon
489
Eversource Energy
ES
$27.2B
$3.85M 0.01%
44,485
-251
-0.6% -$22.4K
VTWO icon
490
Vanguard Russell 2000 ETF
VTWO
$17.5B
$3.85M 0.01%
48,586
+28
+0.1% +$1.98K
MPWR icon
491
Monolithic Power Systems
MPWR
$70B
$3.84M 0.01%
10,475
+237
+2% +$76K
GM icon
492
General Motors
GM
$76B
$3.83M 0.01%
92,030
+740
+0.8% +$28.8K
IGSB icon
493
iShares 1-5 Year Investment Grade Corporate Bond ETF
IGSB
$23.4B
$3.82M 0.01%
69,257
+9,485
+16% +$521K
OBDC icon
494
Blue Owl Capital
OBDC
$5.82B
$3.8M 0.01%
300,044
+267,457
+821% +$3.39M
TBF icon
495
ProShares Short 20+ Year Treasury ETF
TBF
$106M
$3.79M 0.01%
240,490
+1,735
+0.7% +$27.3K
IHI icon
496
iShares US Medical Devices ETF
IHI
$3.49B
$3.74M 0.01%
68,532
+3,636
+6% +$190K
DGX icon
497
Quest Diagnostics
DGX
$26.4B
$3.73M 0.01%
31,341
+1,532
+5% +$187K
XLY icon
498
State Street Consumer Discretionary Select Sector SPDR ETF
XLY
$23.6B
$3.73M 0.01%
46,364
+10,346
+29% +$798K
PFF icon
499
iShares Preferred and Income Securities ETF
PFF
$13.3B
$3.72M 0.01%
96,673
+33,063
+52% +$1.24M
ADI icon
500
Analog Devices
ADI
$189B
$3.72M 0.01%
25,175
+2,526
+11% +$335K
18 19
20
21 22

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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.