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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
CTRA
6251
DELISTED
Coterra Energy
CTRA
– –
-36,489
Closed -$938K
CTSO icon
6252
PUT
Cytosorbents Corp
CTSO
$22.6M
– –
-47
Closed -$1K
CUBE icon
6253
CALL
CubeSmart
CUBE
$9.53B
– –
-62
Closed -$2K
CVGI icon
6254
Commercial Vehicle Group
CVGI
$157M
– –
-4,645
Closed -$49.4K
CWB icon
6255
State Street SPDR Bloomberg Convertible Securities ETF
CWB
$5.64B
– –
-161
Closed -$8K
CWEN icon
6256
CALL
Clearway Energy Class C
CWEN
$5B
– –
-234
Closed -$8K
CYD icon
6257
China Yuchai International
CYD
$1.69B
– –
-4,304
Closed -$104K
CYD icon
6258
PUT
China Yuchai International
CYD
$1.69B
– –
-29
Closed -$1K
CYBR
6259
DELISTED
CyberArk
CYBR
– –
-16,594
Closed -$772K
CYRX icon
6260
CryoPort
CYRX
$775M
– –
-3,924
Closed -$34.7K
CYTK icon
6261
CALL
Cytokinetics
CYTK
$11B
– –
-99
Closed -$6K
DAR icon
6262
Darling Ingredients
DAR
$9.93B
– –
-5,004
Closed -$90.9K
DBC icon
6263
PUT
Invesco DB Commodity Index Tracking Fund
DBC
$1.73B
– –
-133
Closed -$2K
DBB icon
6264
Invesco DB Base Metals Fund
DBB
$306M
– –
-4,558
Closed -$86.8K
DBRG icon
6265
CALL
DigitalBridge
DBRG
$2.94B
– –
-95
Closed -$1K
DBVT
6266
CALL
DBV Technologies
DBVT
$807M
– –
-2
Closed -$2K
DBVT
6267
PUT
DBV Technologies
DBVT
$807M
– –
-7
Closed -$6K
DCI icon
6268
CALL
Donaldson
DCI
$10.8B
– –
-171
Closed -$10K
DCI icon
6269
Donaldson
DCI
$10.8B
$0 ﹤0.01%
+12
New +$575
DCO icon
6270
PUT
Ducommun
DCO
$2.68B
– –
-9
Closed -$1K
DECK icon
6271
Deckers Outdoor
DECK
$13.3B
– –
-9,450
Closed -$142K
DHC
6272
PUT
Diversified Healthcare Trust
DHC
$2.26B
– –
-33
Closed -$1K
DIG icon
6273
ProShares Ultra Energy
DIG
$71.1M
– –
-1,486
Closed -$73K
DINO icon
6274
HF Sinclair
DINO
$15.9B
– –
-8,424
Closed -$401K
DIOD icon
6275
Diodes
DIOD
$4B
– –
-441
Closed -$13.2K
249 250
251
252 253

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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.