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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
GTLS
5626
PUT
DELISTED
Chart Industries
GTLS
$1K ﹤0.01%
+7
New +$377
GTN icon
5627
CALL
Gray Television
GTN
$407M
$1K ﹤0.01%
92
-711
-89% -$10.7K
GVA icon
5628
CALL
Granite Construction
GVA
$5.45B
$1K ﹤0.01%
+2
New +$123
GVA icon
5629
Granite Construction
GVA
$5.45B
$1K ﹤0.01%
19
-900
-98% -$55.5K
GVA icon
5630
PUT
Granite Construction
GVA
$5.45B
$1K ﹤0.01%
+7
New +$431
HEI.A icon
5631
PUT
HEICO Corp Class A
HEI.A
$35.4B
$1K ﹤0.01%
18
-198
-92% -$10.7K
HGV icon
5632
CALL
Hilton Grand Vacations
HGV
$3.84B
$1K ﹤0.01%
+4
New +$175
HLX icon
5633
PUT
Helix Energy Solutions
HLX
$1.46B
$1K ﹤0.01%
+6
New +$42
HMC icon
5634
CALL
Honda
HMC
$36.5B
$1K ﹤0.01%
+40
New +$1.41K
HMY icon
5635
CALL
Harmony Gold Mining
HMY
$9.92B
$1K ﹤0.01%
10
-54
-84% -$108
HMY icon
5636
PUT
Harmony Gold Mining
HMY
$9.92B
$1K ﹤0.01%
27
-127
-82% -$253
HOV icon
5637
PUT
Hovnanian Enterprises
HOV
$785M
$1K ﹤0.01%
1
-1
-50% -$58
HRI icon
5638
PUT
Herc Holdings
HRI
$5.43B
$1K ﹤0.01%
7
-44
-86% -$2.87K
HWC icon
5639
PUT
Hancock Whitney
HWC
$6.13B
$1K ﹤0.01%
+5
New +$267
HXL icon
5640
PUT
Hexcel
HXL
$8.32B
$1K ﹤0.01%
+15
New +$988
IAU icon
5641
CALL
iShares Gold Trust
IAU
$63B
$1K ﹤0.01%
11
– –
IBUY icon
5642
CALL
Amplify Online Retail ETF
IBUY
$106M
$1K ﹤0.01%
+50
New +$2.25K
ICLR icon
5643
PUT
Icon
ICLR
$12.8B
$1K ﹤0.01%
+125
New +$14.3K
ICUI icon
5644
ICU Medical
ICUI
$3.93B
$1K ﹤0.01%
+7
New +$1.65K
IEP icon
5645
CALL
Icahn Enterprises
IEP
$5.17B
$1K ﹤0.01%
+40
New +$2.28K
IMMR icon
5646
CALL
Immersion
IMMR
$216M
$1K ﹤0.01%
39
+10
+34% +$101
IMNN icon
5647
CALL
Imunon
IMNN
$6.35M
– –
0
– –
ING icon
5648
PUT
ING
ING
$93.8B
$1K ﹤0.01%
+22
New +$407
INGN icon
5649
CALL
Inogen
INGN
$167M
$1K ﹤0.01%
+4
New +$488
INGN icon
5650
PUT
Inogen
INGN
$167M
$1K ﹤0.01%
+10
New +$1.22K
224 225
226
227 228

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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.