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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
DIOD icon
6276
PUT
Diodes
DIOD
$4B
– –
-5
Closed -$3K
DKL icon
6277
CALL
Delek Logistics
DKL
$3.04B
– –
-14
Closed -$3K
DKS icon
6278
Dick's Sporting Goods
DKS
$18.4B
– –
-41,389
Closed -$1.35M
DLTH icon
6279
Duluth Holdings
DLTH
$160M
– –
-9,283
Closed -$166K
DLX icon
6280
CALL
Deluxe
DLX
$1.19B
– –
-20
Closed -$1K
DLX icon
6281
Deluxe
DLX
$1.19B
– –
-691
Closed -$51.1K
DMRC icon
6282
CALL
Digimarc Corp
DMRC
$133M
– –
-10
Closed -$1K
DNN icon
6283
PUT
Denison Mines
DNN
$2.63B
– –
-25
Closed -$4K
DOC icon
6284
CALL
Healthpeak Properties
DOC
$15.4B
– –
-56
Closed -$2K
DPZ icon
6285
Domino's
DPZ
$11B
– –
-6,615
Closed -$1.44M
DRH icon
6286
Diamondrock Hospitality Co
DRH
$2.63B
– –
-96
Closed -$1K
DRN icon
6287
Direxion Daily Real Estate Bull 3X ETF
DRN
$51.4M
– –
-4,042
Closed -$92K
DSS icon
6288
DSS Inc
DSS
$5.52M
– –
-20
Closed -$19K
DSS icon
6289
PUT
DSS Inc
DSS
$5.52M
– –
0
– -$27K
DVY icon
6290
iShares Select Dividend ETF
DVY
$24B
– –
-15,626
Closed -$1.54M
EA icon
6291
Electronic Arts
EA
$52.4B
– –
-8,124
Closed -$985K
EBS icon
6292
Emergent Biosolutions
EBS
$375M
– –
-622
Closed -$31K
ECPG icon
6293
Encore Capital Group
ECPG
$1.93B
– –
-4,809
Closed -$206K
ECPG icon
6294
PUT
Encore Capital Group
ECPG
$1.93B
– –
-147
Closed -$34K
EEFT icon
6295
Euronet Worldwide
EEFT
$3.02B
– –
-338
Closed -$29.8K
EEM icon
6296
iShares MSCI Emerging Markets ETF
EEM
$28B
– –
-348,592
Closed -$16.4M
EEMV icon
6297
iShares MSCI Emerging Markets Min Vol Factor ETF
EEMV
$3.45B
– –
-12,766
Closed -$775K
EG icon
6298
Everest Group
EG
$15.2B
– –
-7,180
Closed -$1.72M
EG icon
6299
PUT
Everest Group
EG
$15.2B
– –
-139
Closed -$71K
EGBN icon
6300
CALL
Eagle Bancorp
EGBN
$867M
– –
-301
Closed -$35K
250 251
252
253 254

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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.