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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
LGMK
5001
CALL
DELISTED
LogicMark
LGMK
– –
0
– –
LIVN icon
5002
PUT
LivaNova
LIVN
$4.41B
$3K ﹤0.01%
+37
New +$3.15K
LTC
5003
PUT
LTC Properties
LTC
$2.15B
$3K ﹤0.01%
9
-1
-10% -$39
LYG icon
5004
CALL
Lloyds Banking Group
LYG
$88.5B
$3K ﹤0.01%
212
+139
+190% +$538
MANH icon
5005
PUT
Manhattan Associates
MANH
$9.61B
$3K ﹤0.01%
+33
New +$1.54K
MCY icon
5006
PUT
Mercury Insurance
MCY
$6B
$3K ﹤0.01%
+6
New +$286
MD icon
5007
PUT
Pediatrix Medical
MD
$2.16B
$3K ﹤0.01%
+53
New +$2.9K
MDB icon
5008
PUT
MongoDB
MDB
$25.2B
$3K ﹤0.01%
+209
New +$6.75K
MFC icon
5009
PUT
Manulife Financial
MFC
$72.9B
$3K ﹤0.01%
26
+1
+4% +$20
MG icon
5010
PUT
Mistras Group
MG
$490M
$3K ﹤0.01%
101
-99
-50% -$2.04K
KG
5011
PUT
Kestrel Group
KG
$69.8M
$3K ﹤0.01%
+8
New +$1.11K
MMSI icon
5012
PUT
Merit Medical Systems
MMSI
$4.56B
$3K ﹤0.01%
70
+15
+27% +$679
MOV icon
5013
PUT
Movado Group
MOV
$831M
$3K ﹤0.01%
+48
New +$1.53K
MSB
5014
CALL
Mesabi Trust
MSB
$293M
$3K ﹤0.01%
+104
New +$2.79K
NCMI icon
5015
PUT
National CineMedia
NCMI
$364M
$3K ﹤0.01%
6
+5
+500% +$330
NG icon
5016
CALL
NovaGold Resources
NG
$2.6B
$3K ﹤0.01%
111
-281
-72% -$1.13K
NGD
5017
PUT
DELISTED
New Gold Inc
NGD
$3K ﹤0.01%
+180
New +$506
NRP icon
5018
PUT
Natural Resource Partners
NRP
$1.3B
$3K ﹤0.01%
12
+3
+33% +$90
OMF icon
5019
PUT
OneMain Financial
OMF
$7.03B
$3K ﹤0.01%
11
-136
-93% -$4.32K
ONB icon
5020
Old National Bancorp
ONB
$10.1B
$3K ﹤0.01%
+178
New +$3.13K
ONTO icon
5021
PUT
Onto Innovation
ONTO
$12.8B
$3K ﹤0.01%
+50
New +$1.34K
PCYO icon
5022
CALL
Pure Cycle
PCYO
$258M
$3K ﹤0.01%
7
-3
-30% -$26
PFGC icon
5023
Performance Food Group
PFGC
$17.9B
$3K ﹤0.01%
+118
New +$3.78K
PFX icon
5024
PUT
PhenixFIN
PFX
$84.1M
$3K ﹤0.01%
2
+1
+100% +$92
PGRE
5025
PUT
DELISTED
Paramount Group
PGRE
$3K ﹤0.01%
+44
New +$641
199 200
201
202 203

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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.