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 |
Boeing
BA
|
$49.5M |
| 2 |
Pinduoduo
PDD
|
$45.3M |
| 3 |
Microsoft
MSFT
|
$42.5M |
| 4 |
Apple
AAPL
|
$33.3M |
| 5 |
Direxion Daily Semiconductor Bull 3X Shares
SOXL
|
$25.4M |
Top Sells
| 1 |
Broadcom
AVGO
|
$95.4M |
| 2 |
Citigroup
C
|
$57.9M |
| 3 |
Pfizer
PFE
|
$55.9M |
| 4 |
TSMC
TSM
|
$40.4M |
| 5 |
Starbucks
SBUX
|
$40.4M |
Sector Composition
| 1 | Technology | 23.11% |
| 2 | Consumer Discretionary | 16.53% |
| 3 | Healthcare | 8.58% |
| 4 | Industrials | 7.58% |
| 5 | Financials | 7.29% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
51
Valero Energy
VLO
$47.2B
| $11.7M | 0.01% | 86,473 -11,197 | -11% | -$1.51M |
|
52
Carnival Corp
CCL
$43.2B
| $11.6M | 0.01% | 627,189 -321,128 | -34% | -$5.93M |
|
53
iShares MSCI Brazil ETF
EWZ
$5.45B
| $11.5M | 0.01% | 389,145 -695,805 | -64% | -$20.5M |
|
54
Novavax
NVAX
$1.21B
| $11.4M | 0.01% | 898,820 +631,389 | +236% | +$7.97M |
|
55
Vistra
VST
$64.1B
| $11.1M | 0.01% | +93,922 | New | +$11.1M |
|
56
iShares National Muni Bond ETF
MUB
$38.6B
| $11M | 0.01% | 101,353 +98,770 | +3,824% | +$10.7M |
|
57
Steel Dynamics
STLD
$19.3B
| $10.6M | 0.01% | 84,163 +56,258 | +202% | +$7.09M |
|
58
Union Pacific
UNP
$133B
| $10.6M | 0.01% | 43,010 +31,781 | +283% | +$7.83M |
|
59
Upstart Holdings
UPST
$7.05B
| $10.6M | 0.01% | 264,883 +211,154 | +393% | +$8.45M |
|
60
Micron Technology
MU
$133B
| $10.6M | 0.01% | 102,047 +46,385 | +83% | +$4.81M |
|
61
Marathon Digital Holdings
MARA
$5.92B
| $10.4M | 0.01% | 641,165 -723,251 | -53% | -$11.7M |
|
62
Eaton
ETN
$136B
| $10.4M | 0.01% | +31,262 | New | +$10.4M |
|
63
Biogen
BIIB
$19.4B
| $10.3M | 0.01% | 53,118 +32,405 | +156% | +$6.28M |
|
64
Newmont
NEM
$81.7B
| $10.2M | 0.01% | 190,777 -633,374 | -77% | -$33.9M |
|
65
Iris Energy
IREN
$6.4B
| $10M | 0.01% | 1,185,323 +177,192 | +18% | +$1.5M |
|
66
SoFi Technologies
SOFI
$30.6B
| $9.89M | 0.01% | 1,257,779 -560,019 | -31% | -$4.4M |
|
67
Workday
WDAY
$61.6B
| $9.79M | 0.01% | +40,042 | New | +$9.79M |
|
68
Celsius Holdings
CELH
$16.2B
| $9.73M | 0.01% | 310,192 +3,342 | +1% | +$105K |
|
69
Las Vegas Sands
LVS
$39.6B
| $9.69M | 0.01% | 192,572 +77,978 | +68% | +$3.93M |
|
70
Analog Devices
ADI
$124B
| $9.64M | 0.01% | 41,868 +2,799 | +7% | +$644K |
|
71
SiriusXM
SIRI
$7.96B
| $9.45M | 0.01% | 399,428 -229,489 | -36% | -$5.43M |
|
72
Amazon
AMZN
$2.44T
| $9.35M | 0.01% | 50,202 -138,465 | -73% | -$25.8M |
|
73
Direxion Daily FTSE China Bull 3X Shares
YINN
$1.21B
| $9.28M | 0.01% | 251,177 +175,170 | +230% | +$6.47M |
|
74
Energy Transfer Partners
ET
$60.8B
| $9M | 0.01% | 560,682 +57,128 | +11% | +$917K |
|
75
Fortinet
FTNT
$60.4B
| $8.75M | 0.01% | 112,855 -172,763 | -60% | -$13.4M |
|