Simplex Trading Portfolio holdings
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.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Tesla
TSLA
|
+$33.5M |
| 2 |
Netflix
NFLX
|
+$22.8M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$20.9M |
| 4 |
TWX
Time Warner Inc
TWX
|
+$18.3M |
| 5 |
Alibaba
BABA
|
+$15.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$71.1M |
| 2 |
Micron Technology
MU
|
+$43.8M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$26.3M |
| 4 |
Booking.com
BKNG
|
+$22.2M |
| 5 |
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 | |
|---|---|---|---|---|---|---|
1001
CALL
Stellantis
STLA
$16.5B
| $292K | 0.01% |
1,004
-630
| -39% | -$13.8K |
|
1002
CALL
BJ's Restaurants
BJRI
$1.41B
| $291K | 0.01% |
469
+259
| +123% | +$10.4K |
|
1003
Nexstar Media Group
NXST
$5.6B
| $290K | 0.01% |
4,369
-3,353
| -43% | -$247K |
|
1004
PUT
Papa John's
PZZA
$999M
| $290K | 0.01% |
812
+760
| +1,462% | +$45.5K |
|
1005
PUT
Mondelez International
MDLZ
$77.7B
| $288K | 0.01% |
1,142
-1,919
| -63% | -$83.4K |
|
|
ACOR
1006
DELISTED
Acorda Therapeutics
ACOR
| $288K | 0.01% |
102
+85
| +500% | +$255K |
|
|
TYNS
1007
CALL
DELISTED
Direxion Daily 7-10 Year Treasury Bear 1X Shares
TYNS
| $288K | 0.01% |
684
-718
| -51% | -$20.8K |
|
1008
CALL
Comcast
CMCSA
$79.1B
| $287K | 0.01% |
2,015
-1,717
| -46% | -$66.6K |
|
1009
Fate Therapeutics
FATE
$281M
| $287K | 0.01% |
29,462
+25,468
| +638% | +$244K |
|
1010
The Greenbrier Companies
GBX
$1.61B
| $287K | 0.01% |
5,731
-4,407
| -43% | -$224K |
|
|
LAYN
1011
DELISTED
Layne Christensen Co
LAYN
| $287K | 0.01% |
+19,294
| New | +$279K |
|
1012
PUT
Cognizant
CTSH
$21.5B
| $286K | 0.01% |
926
-183
| -17% | -$14.5K |
|
1013
Landstar System
LSTR
$6.8B
| $286K | 0.01% |
+2,616
| New | +$287K |
|
1014
CALL
Procter & Gamble
PG
$343B
| $286K | 0.01% |
2,460
-330
| -12% | -$27.5K |
|
|
SRCL
1015
CALL
DELISTED
Stericycle Inc
SRCL
| $284K | 0.01% |
4,834
+4,737
| +4,884% | +$321K |
|
1016
PUT
Martin Marietta Materials
MLM
$33.6B
| $283K | 0.01% |
152
+111
| +271% | +$24.1K |
|
1017
CALL
Wells Fargo
WFC
$261B
| $283K | 0.01% |
2,756
-4,003
| -59% | -$238K |
|
|
MIC
1018
PUT
DELISTED
Macquarie Infrastructure Holdings, LLC
MIC
| $283K | 0.01% |
477
+69
| +17% | +$3.72K |
|
1019
CALL
Johnson & Johnson
JNJ
$635B
| $282K | 0.01% |
1,782
-366
| -17% | -$49.5K |
|
|
JWN
1020
CALL
DELISTED
Nordstrom
JWN
| $282K | 0.01% |
734
-347
| -32% | -$17.3K |
|
1021
ProShares VIX Mid-Term Futures ETF
VIXM
$40M
| $282K | 0.01% |
10,671
+9,769
| +1,083% | +$230K |
|
1022
Alcoa
AA
$11.7B
| $281K | 0.01% |
6,265
-5,909
| -49% | -$293K |
|
1023
Valvoline
VVV
$4.97B
| $281K | 0.01% |
12,703
-1,041
| -8% | -$24.8K |
|
|
HDS
1024
PUT
DELISTED
HD Supply Holdings, Inc.
HDS
| $281K | 0.01% |
989
+657
| +198% | +$24.7K |
|
|
STMP
1025
CALL
DELISTED
Stamps.com, Inc.
STMP
| $281K | 0.01% |
93
-93
| -50% | -$18.2K |
|
Similar funds
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.