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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
GIFI
6376
CALL
DELISTED
Gulf Island Fabrication
GIFI
– –
-60
Closed -$11K
GIFI
6377
DELISTED
Gulf Island Fabrication
GIFI
– –
-5,976
Closed -$66.4K
GIFI
6378
PUT
DELISTED
Gulf Island Fabrication
GIFI
– –
-191
Closed -$2K
GILD icon
6379
Gilead Sciences
GILD
$161B
– –
-78,525
Closed -$6.24M
GKOS icon
6380
Glaukos
GKOS
$9.02B
– –
-200
Closed -$5K
GKOS icon
6381
PUT
Glaukos
GKOS
$9.02B
– –
-2
Closed -$2K
GL icon
6382
CALL
Globe Life
GL
$13.5B
– –
-4
Closed -$2K
GL icon
6383
Globe Life
GL
$13.5B
– –
-1,337
Closed -$117K
GLAD icon
6384
Gladstone Capital
GLAD
$425M
$0 ﹤0.01%
45
-43
-49% -$773
GLDD
6385
CALL
DELISTED
Great Lakes Dredge & Dock
GLDD
– –
-186
Closed -$11K
GLOB icon
6386
Globant
GLOB
$1.35B
– –
-138
Closed -$6.76K
GLOB icon
6387
PUT
Globant
GLOB
$1.35B
– –
-15
Closed -$2K
LKFT
6388
Lakefront Biotherapeutics American Depositary Shares
LKFT
$1.82B
– –
-98
Closed -$10.6K
LKFT
6389
PUT
Lakefront Biotherapeutics American Depositary Shares
LKFT
$1.82B
– –
-2
Closed -$1K
CBIO
6390
PUT
Crescent Biopharma
CBIO
$602M
– –
0
– -$1K
GNL icon
6391
CALL
Global Net Lease
GNL
$1.87B
– –
-243
Closed -$4K
GNRC icon
6392
CALL
Generac Holdings
GNRC
$11.9B
– –
-11
Closed -$1K
GNRC icon
6393
Generac Holdings
GNRC
$11.9B
– –
-4,717
Closed -$224K
GNRC icon
6394
PUT
Generac Holdings
GNRC
$11.9B
– –
-43
Closed -$4K
GNSS icon
6395
Genasys
GNSS
$75.6M
$0 ﹤0.01%
209
+109
+109% +$249
GOGL
6396
PUT
DELISTED
Golden Ocean Group
GOGL
– –
-48
Closed -$2K
GOGO icon
6397
CALL
Gogo Inc
GOGO
$515M
– –
-99
Closed -$4K
GOGO icon
6398
Gogo Inc
GOGO
$515M
– –
-11,548
Closed -$111K
B
6399
Barrick Mining
B
$62.2B
– –
-29,544
Closed -$393K
GOOG icon
6400
Alphabet (Google) Class C
GOOG
$3.9T
– –
-502,780
Closed -$26.3M
254 255
256
257 258

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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.