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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
WDFC icon
6951
WD-40
WDFC
$3.13B
– –
-46
Closed -$5.8K
WEAT icon
6952
Teucrium Wheat Fund
WEAT
$322M
– –
-4,066
Closed -$121K
WEN icon
6953
Wendy's
WEN
$1.37B
– –
-96,835
Closed -$1.61M
WES icon
6954
CALL
Western Midstream Partners
WES
$19.7B
– –
-100
Closed -$2K
WES icon
6955
Western Midstream Partners
WES
$19.7B
– –
-1,843
Closed -$70.2K
WES icon
6956
PUT
Western Midstream Partners
WES
$19.7B
– –
-100
Closed -$9K
WEX icon
6957
WEX
WEX
$5.68B
– –
-1,844
Closed -$277K
WEX icon
6958
PUT
WEX
WEX
$5.68B
– –
-72
Closed -$2K
WIX icon
6959
WIX.com
WIX
$2B
– –
-19,566
Closed -$1.37M
WK icon
6960
Workiva
WK
$2.86B
– –
-3,352
Closed -$77.1K
WK icon
6961
PUT
Workiva
WK
$2.86B
– –
-17
Closed -$2K
WLK icon
6962
Westlake Corp
WLK
$9.84B
– –
-3,297
Closed -$367K
WLKP icon
6963
CALL
Westlake Chemical Partners
WLKP
$775M
– –
-25
Closed -$3K
WMS icon
6964
CALL
Advanced Drainage Systems
WMS
$10.7B
– –
-94
Closed -$14K
WNC icon
6965
CALL
Wabash National
WNC
$567M
– –
-53
Closed -$9K
WNC icon
6966
PUT
Wabash National
WNC
$567M
– –
-44
Closed -$2K
WOR icon
6967
CALL
Worthington Enterprises
WOR
$2.7B
– –
-128
Closed -$4K
WPRT
6968
Westport Fuel Systems
WPRT
$36.3M
– –
-512
Closed -$15.5K
WRLD icon
6969
World Acceptance Corp
WRLD
$849M
– –
-2,079
Closed -$214K
WTFC icon
6970
Wintrust Financial
WTFC
$10.5B
– –
-11
Closed –
WTRG icon
6971
CALL
Essential Utilities
WTRG
$11.3B
– –
-45
Closed -$6K
WYNN icon
6972
Wynn Resorts
WYNN
$9.93B
– –
-41,348
Closed -$7.15M
XES icon
6973
State Street SPDR S&P Oil & Gas Equipment & Services ETF
XES
$396M
– –
-4,167
Closed -$713K
XIN
6974
DELISTED
Xinyuan Real Estate
XIN
– –
-2,420
Closed -$162K
XPO icon
6975
XPO
XPO
$25B
– –
-9,692
Closed -$323K
277 278
279
280 281

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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.