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Simplex Trading

Simplex Trading Portfolio holdings

AUM $149B
1-Year Est. Return 62.07%
 

Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.

This Fund
S&P 500
This Quarter Est. Return
+3.04%
1 Year Est. Return
+62.07%
3 Year Est. Return
+116.86%
5 Year Est. Return
+116.02%
10 Year Est. Return
+774.44%
AUM
$2.27B
AUM Growth
-$49.2M
Cap. Flow
-$210M
Cap. Flow %
-9.24%
Top 10 Hldgs %
17.82%
Holding
7,591
New
1,643
Increased
2,060
Reduced
2,267
Closed
1,502

Top Buys

Rank Stock Value
1
TSLA icon
Tesla
TSLA
+$33.5M
2
NFLX icon
Netflix
NFLX
+$22.8M
3
DIA icon
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
+$20.9M
4
TWX
Time Warner Inc
TWX
+$18.3M
5
BABA icon
Alibaba
BABA
+$15.2M

Top Sells

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$71.1M
2
MU icon
Micron Technology
MU
+$43.8M
3
GOOG icon
Alphabet (Google) Class C
GOOG
+$26.3M
4
BKNG icon
Booking.com
BKNG
+$22.2M
5
BA icon
Boeing
BA
+$21.6M

Sector Composition

Rank Sector Weight
1 Consumer Discretionary 7.87%
2 Communication Services 7.14%
3 Technology 6.23%
4 Financials 5.5%
5 Healthcare 5.2%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
BOOM icon
6151
CALL
DMC Global
BOOM
$121M
– –
-23
Closed -$6K
BOOT icon
6152
Boot Barn
BOOT
$4.55B
– –
-10,856
Closed -$196K
BP icon
6153
BP
BP
$113B
– –
-17,107
Closed -$644K
BPMC
6154
DELISTED
Blueprint Medicines
BPMC
– –
-1,284
Closed -$111K
BR icon
6155
Broadridge
BR
$17.2B
– –
-1,835
Closed -$182K
BRC icon
6156
Brady Corp
BRC
$4.45B
– –
-141
Closed -$5K
BRFS
6157
DELISTED
BRF SA
BRFS
– –
-4,055
Closed -$39.2K
BSET icon
6158
CALL
Bassett Furniture
BSET
$169M
– –
-15
Closed -$1K
BSET icon
6159
Bassett Furniture
BSET
$169M
– –
-125
Closed -$4K
BSX icon
6160
Boston Scientific
BSX
$65.8B
– –
-2,486
Closed -$67.6K
BTE icon
6161
CALL
Baytex Energy
BTE
$3.08B
– –
-529
Closed -$1K
BTG icon
6162
CALL
B2Gold
BTG
$5.16B
– –
-53
Closed -$2K
BVN icon
6163
Compañía de Minas Buenaventura
BVN
$7.85B
– –
-2,223
Closed -$33.7K
BVN icon
6164
PUT
Compañía de Minas Buenaventura
BVN
$7.85B
– –
-140
Closed -$2K
BWX icon
6165
State Street SPDR Bloomberg International Treasury Bond ETF
BWX
$1.32B
– –
-16
Closed –
BXP icon
6166
CALL
Boston Properties
BXP
$11B
– –
-8
Closed -$1K
BXP icon
6167
PUT
Boston Properties
BXP
$11B
– –
-25
Closed -$1K
BYD icon
6168
Boyd Gaming
BYD
$6.47B
– –
-4,227
Closed -$151K
BBBY
6169
Bed Bath & Beyond
BBBY
$473M
– –
-2,378
Closed -$111K
BZUN
6170
Baozun
BZUN
$144M
– –
-13,591
Closed -$534K
C icon
6171
Citigroup
C
$222B
– –
-263,767
Closed -$19.8M
CAF
6172
CALL
Morgan Stanley China A Share Fund
CAF
$334M
– –
-4
Closed -$1K
CAPL icon
6173
CrossAmerica Partners
CAPL
$830M
– –
-347
Closed -$8.02K
CASY icon
6174
Casey's General Stores
CASY
$31.9B
– –
-2,674
Closed -$309K
CATY icon
6175
CALL
Cathay General Bancorp
CATY
$4.2B
– –
-20
Closed -$6K
245 246
247
248 249

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Simplex Trading's Q1 2018 Portfolio in Review

As of Q1 2018, Simplex Trading held 7,591 positions worth $2.27B, down 2.1% from $2.32B the previous quarter. Its ten largest holdings account for 18% of the portfolio.

Simplex Trading withdrew a net $210M in Q1 2018, closing 1,502 positions and reducing 2,267 holdings. Its most notable exit was Alphabet (Google) Class C, an estimated $26.3M position sold in full.

By sector, the portfolio is most concentrated in Consumer Discretionary at 7.9% of assets, down from 11% a quarter earlier, followed by Communication Services and Technology.

Against the trend, Simplex Trading opened a new position in Tesla worth $27.1M.

  • Simplex Trading's largest Q1 2018 buy was Tesla: 1,525,035 shares worth $27.1M.
  • Simplex Trading added most to Netflix in Q1 2018, an estimated $22.8M increase.
  • Simplex Trading's biggest Q1 2018 reduction was Amazon, cutting an estimated $71.1M.
  • Simplex Trading fully exited Alphabet (Google) Class C in Q1 2018, selling an estimated $26.3M.
  • Simplex Trading's ten largest holdings make up 18% of its $2.27B portfolio in Q1 2018.
  • Simplex Trading opened 1,643 new positions and closed 1,502 in Q1 2018.
  • Simplex Trading's portfolio value fell 2.1% quarter-over-quarter to $2.27B.

Based on Simplex Trading's 13F filing for Q1 2018, filed 26 Apr 2018.