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
| 1 |
Apple
AAPL
|
$35.2M |
| 2 |
Micron Technology
MU
|
$32.9M |
| 3 |
Berkshire Hathaway Class B
BRK.B
|
$29.5M |
| 4 |
NVIDIA
NVDA
|
$22.9M |
| 5 |
SPDR Dow Jones Industrial Average ETF Trust
DIA
|
$22M |
Top Sells
| 1 |
TWX
Time Warner Inc
TWX
|
$34.8M |
| 2 |
Amazon
AMZN
|
$33.4M |
| 3 |
Tesla
TSLA
|
$19.8M |
| 4 |
Netflix
NFLX
|
$17.7M |
| 5 |
TWTR
Twitter, Inc.
TWTR
|
$13.5M |
Sector Composition
| 1 | Technology | 20.43% |
| 2 | Consumer Discretionary | 15.24% |
| 3 | Communication Services | 12% |
| 4 | Financials | 10.18% |
| 5 | Industrials | 9.87% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
126
Walt Disney
DIS
$211B
| $2.43M | 0.01% |
23,182
+12,339
| +114% | +$1.29M |
|
127
General Mills
GIS
$26.6B
| $2.41M | 0.01% |
54,529
+24,598
| +82% | +$1.09M |
|
128
Stellantis
STLA
$26.4B
| $2.37M | 0.01% |
+125,372
| New | +$2.37M |
|
129
T-Mobile US
TMUS
$284B
| $2.34M | 0.01% |
39,243
+14,557
| +59% | +$869K |
|
|
FDC
130
DELISTED
First Data Corporation
FDC
| $2.34M | 0.01% |
111,962
+111,272
| +16,126% | +$2.33M |
|
131
Papa John's
PZZA
$1.58B
| $2.32M | 0.01% |
45,814
+14,068
| +44% | +$713K |
|
132
Blackstone
BX
$131B
| $2.32M | 0.01% |
71,999
-50,947
| -41% | -$1.64M |
|
133
Fidelity National Information Services
FIS
$35.6B
| $2.3M | 0.01% |
+21,690
| New | +$2.3M |
|
134
Consumers Staples Select Sector SPDR Fund
XLP
$15.8B
| $2.27M | 0.01% |
44,003
-8,249
| -16% | -$425K |
|
|
CZR
135
DELISTED
Caesars Entertainment Corporation
CZR
| $2.25M | 0.01% |
+210,631
| New | +$2.25M |
|
136
Marriott Vacations Worldwide
VAC
$2.69B
| $2.25M | 0.01% |
19,923
+17,940
| +905% | +$2.03M |
|
137
Delek US
DK
$1.92B
| $2.24M | 0.01% |
44,697
+27,878
| +166% | +$1.4M |
|
|
CXO
138
DELISTED
CONCHO RESOURCES INC.
CXO
| $2.24M | 0.01% |
16,177
+7,405
| +84% | +$1.02M |
|
139
Agilent Technologies
A
$35.5B
| $2.24M | 0.01% |
+36,172
| New | +$2.24M |
|
140
Sarepta Therapeutics
SRPT
$1.98B
| $2.24M | 0.01% |
16,920
-459
| -3% | -$60.7K |
|
141
Autoliv
ALV
$9.56B
| $2.2M | 0.01% |
15,355
+14,048
| +1,075% | +$2.01M |
|
142
Marvell Technology
MRVL
$53.7B
| $2.18M | 0.01% |
101,886
+34,966
| +52% | +$750K |
|
143
Royal Caribbean
RCL
$96.4B
| $2.17M | 0.01% |
20,937
+20,896
| +50,966% | +$2.16M |
|
144
SAP
SAP
$316B
| $2.15M | 0.01% |
18,578
-4,579
| -20% | -$529K |
|
|
X
145
DELISTED
US Steel
X
| $2.1M | 0.01% |
60,466
-20,319
| -25% | -$706K |
|
146
Mohawk Industries
MHK
$8.11B
| $2.09M | 0.01% |
9,735
+4,647
| +91% | +$995K |
|
147
Agios Pharmaceuticals
AGIO
$2.36B
| $2.08M | 0.01% |
24,678
+8,444
| +52% | +$711K |
|
148
TechnipFMC
FTI
$15.7B
| $2.07M | 0.01% |
65,347
+20,159
| +45% | +$640K |
|
149
KKR & Co
KKR
$120B
| $2.07M | 0.01% |
83,234
+37,690
| +83% | +$936K |
|
150
Assurant
AIZ
$10.8B
| $2.06M | 0.01% |
19,890
+11,546
| +138% | +$1.19M |
|