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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
IPI icon
5651
PUT
Intrepid Potash
IPI
$460M
$1K ﹤0.01%
+4
New +$155
IRT icon
5652
CALL
Independence Realty Trust
IRT
$3.92B
$1K ﹤0.01%
26
-34
-57% -$308
ITT icon
5653
PUT
ITT
ITT
$17.5B
$1K ﹤0.01%
38
+3
+9% +$158
JAKK icon
5654
Jakks Pacific
JAKK
$280M
$1K ﹤0.01%
92
+40
+77% +$946
JBGS
5655
PUT
JBG SMITH
JBGS
$846M
$1K ﹤0.01%
+37
New +$1.23K
JBSS icon
5656
CALL
John B. Sanfilippo & Son
JBSS
$949M
$1K ﹤0.01%
+5
New +$302
JKHY icon
5657
CALL
Jack Henry & Associates
JKHY
$10.7B
$1K ﹤0.01%
+6
New +$730
JLL icon
5658
CALL
Jones Lang LaSalle
JLL
$15.1B
$1K ﹤0.01%
+1
New +$161
JLL icon
5659
PUT
Jones Lang LaSalle
JLL
$15.1B
$1K ﹤0.01%
+17
New +$2.73K
JOE icon
5660
CALL
St. Joe Company
JOE
$3.57B
$1K ﹤0.01%
+10
New +$185
KALA icon
5661
KALA BIO
KALA
$11.8M
– –
0
– –
KALA icon
5662
PUT
KALA BIO
KALA
$11.8M
– –
0
– –
KEP icon
5663
Korea Electric Power
KEP
$15.5B
$1K ﹤0.01%
100
-404
-80% -$6.4K
KLIC icon
5664
PUT
Kulicke & Soffa
KLIC
$5.3B
$1K ﹤0.01%
36
-18
-33% -$434
KNOP icon
5665
CALL
KNOT Offshore Partners
KNOP
$355M
$1K ﹤0.01%
39
+18
+86% +$373
KOPN icon
5666
CALL
Kopin
KOPN
$663M
$1K ﹤0.01%
+69
New +$232
KOPN icon
5667
PUT
Kopin
KOPN
$663M
$1K ﹤0.01%
+67
New +$226
KOS icon
5668
CALL
Kosmos Energy
KOS
$1.56B
$1K ﹤0.01%
47
-223
-83% -$1.4K
KRG icon
5669
PUT
Kite Realty
KRG
$5.95B
$1K ﹤0.01%
+10
New +$162
KTCC icon
5670
CALL
Key Tronic
KTCC
$40.3M
$1K ﹤0.01%
+46
New +$326
KTCC icon
5671
PUT
Key Tronic
KTCC
$40.3M
$1K ﹤0.01%
20
– –
LNN icon
5672
PUT
Lindsay Corp
LNN
$1.16B
$1K ﹤0.01%
20
-58
-74% -$5.27K
LOB icon
5673
CALL
Live Oak Bancshares
LOB
$1.95B
$1K ﹤0.01%
+25
New +$660
LPL icon
5674
PUT
LG Display
LPL
$3.17B
$1K ﹤0.01%
50
-28
-36% -$387
LPLA icon
5675
CALL
LPL Financial
LPLA
$26.3B
$1K ﹤0.01%
21
-54
-72% -$3.35K
225 226
227
228 229

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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.