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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
UGA icon
6901
PUT
United States Gasoline Fund
UGA
$145M
– –
-83
Closed -$2K
UIS icon
6902
PUT
Unisys
UIS
$237M
– –
-170
Closed -$7K
ULTA icon
6903
Ulta Beauty
ULTA
$20.6B
– –
-8,514
Closed -$1.84M
UMH
6904
CALL
UMH Properties
UMH
$1.31B
– –
-68
Closed -$1K
UNM icon
6905
Unum
UNM
$13.7B
– –
-352
Closed -$18.4K
UNP icon
6906
Union Pacific
UNP
$181B
– –
-76,245
Closed -$10.3M
UPS icon
6907
United Parcel Service
UPS
$97.2B
– –
-13,957
Closed -$1.61M
URI icon
6908
United Rentals
URI
$72.5B
– –
-1,560
Closed -$277K
USAC icon
6909
CALL
USA Compression Partners
USAC
$3.91B
– –
-98
Closed -$17K
USFD icon
6910
PUT
US Foods
USFD
$20.9B
– –
-387
Closed -$2K
USMV icon
6911
iShares MSCI USA Min Vol Factor ETF
USMV
$23B
– –
-17,617
Closed -$929K
UTHR icon
6912
United Therapeutics
UTHR
$26.4B
– –
-12,372
Closed -$1.57M
UTI icon
6913
Universal Technical Institute
UTI
$2.07B
– –
-1
Closed –
UTSI icon
6914
CALL
UTStarcom
UTSI
$23M
– –
-8
Closed -$2K
UTSI icon
6915
UTStarcom
UTSI
$23M
$0 ﹤0.01%
19
-39
-67% -$881
UUUU icon
6916
Energy Fuels
UUUU
$3B
$0 ﹤0.01%
3
-298
-99% -$489
UVE icon
6917
Universal Insurance Holdings
UVE
$1.05B
– –
-313
Closed -$9.41K
V icon
6918
Visa
V
$667B
– –
-96,387
Closed -$11.7M
VANI icon
6919
Vivani Medical
VANI
$116M
$0 ﹤0.01%
7
-109
-94% -$4.85K
VC icon
6920
Visteon
VC
$2.66B
– –
-181
Closed -$22.6K
VCR icon
6921
CALL
Vanguard Consumer Discretionary ETF
VCR
$5.81B
– –
-35
Closed -$5K
VEA icon
6922
Vanguard FTSE Developed Markets ETF
VEA
$226B
– –
-8,055
Closed -$365K
VEEV icon
6923
Veeva Systems
VEEV
$29.3B
– –
-28,403
Closed -$1.84M
VET icon
6924
CALL
Vermilion Energy
VET
$1.73B
– –
-38
Closed -$4K
VGK icon
6925
Vanguard FTSE Europe ETF
VGK
$29.7B
– –
-18,551
Closed -$1.11M
275 276
277
278 279

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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.