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 |
SPDR Dow Jones Industrial Average ETF Trust
DIA
|
$32.1M |
| 2 |
PARA
Paramount Global Class B
PARA
|
$23.3M |
| 3 |
Pinduoduo
PDD
|
$17.3M |
| 4 |
Pfizer
PFE
|
$16.8M |
| 5 |
American Airlines Group
AAL
|
$14.5M |
Top Sells
| 1 |
Amazon
AMZN
|
$64.4M |
| 2 |
Alphabet (Google) Class C
GOOG
|
$38.1M |
| 3 |
AutoZone
AZO
|
$32.2M |
| 4 |
SPDR S&P 500 ETF Trust
SPY
|
$25.3M |
| 5 |
Apple
AAPL
|
$22.5M |
Sector Composition
| 1 | Technology | 20.25% |
| 2 | Consumer Discretionary | 15.22% |
| 3 | Healthcare | 10.03% |
| 4 | Financials | 9.2% |
| 5 | Industrials | 9.11% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
126
SPDR S&P Metals & Mining ETF
XME
$2.28B
| $3.13M | 0.01% |
+78,509
| New | +$3.13M |
|
127
Harley-Davidson
HOG
$3.57B
| $3.07M | 0.01% |
+76,538
| New | +$3.07M |
|
128
iShares Select Dividend ETF
DVY
$20.6B
| $3.06M | 0.01% |
26,814
-3,465
| -11% | -$395K |
|
129
Lemonade
LMND
$3.68B
| $3.03M | 0.01% |
32,584
+9,928
| +44% | +$924K |
|
|
KRA
130
DELISTED
Kraton Corporation
KRA
| $3M | 0.01% |
81,937
+9,031
| +12% | +$330K |
|
131
Materials Select Sector SPDR Fund
XLB
$5.46B
| $2.95M | 0.01% |
37,463
+16,382
| +78% | +$1.29M |
|
|
TIGR
132
UP Fintech Holding
TIGR
$2.31B
| $2.95M | 0.01% |
165,765
+66,336
| +67% | +$1.18M |
|
133
Wynn Resorts
WYNN
$13.1B
| $2.95M | 0.01% |
23,493
+14,301
| +156% | +$1.79M |
|
134
DuPont de Nemours
DD
$31.6B
| $2.92M | 0.01% |
+37,815
| New | +$2.92M |
|
135
Stellantis
STLA
$26.4B
| $2.86M | 0.01% |
160,602
+144,391
| +891% | +$2.57M |
|
136
Direxion Daily S&P Biotech Bull 3X Shares
LABU
$727M
| $2.85M | 0.01% |
36,095
+20,908
| +138% | +$1.65M |
|
137
Direxion Daily 20+ Year Treasury Bear 3X Shares
TMV
$177M
| $2.82M | 0.01% |
34,560
+33,172
| +2,390% | +$2.7M |
|
138
Vanguard FTSE Europe ETF
VGK
$26.6B
| $2.78M | 0.01% |
+44,132
| New | +$2.78M |
|
139
Foot Locker
FL
$2.3B
| $2.76M | 0.01% |
48,981
+41,273
| +535% | +$2.32M |
|
140
Builders FirstSource
BLDR
$15.1B
| $2.71M | ﹤0.01% |
58,359
+54,998
| +1,636% | +$2.55M |
|
141
Zillow
Z
$20.2B
| $2.68M | ﹤0.01% |
+20,709
| New | +$2.68M |
|
|
SAGE
142
DELISTED
Sage Therapeutics
SAGE
| $2.66M | ﹤0.01% |
35,473
+31,751
| +853% | +$2.38M |
|
143
Fluor
FLR
$6.93B
| $2.63M | ﹤0.01% |
113,726
-156,545
| -58% | -$3.61M |
|
144
ARK Innovation ETF
ARKK
$7.43B
| $2.61M | ﹤0.01% |
21,794
+15,151
| +228% | +$1.82M |
|
145
Centene
CNC
$14.8B
| $2.61M | ﹤0.01% |
40,912
-11,081
| -21% | -$708K |
|
146
RingCentral
RNG
$2.74B
| $2.6M | ﹤0.01% |
8,734
-6,929
| -44% | -$2.06M |
|
|
XYZ
147
Block, Inc.
XYZ
$46.2B
| $2.59M | ﹤0.01% |
11,386
+11,349
| +30,673% | +$2.58M |
|
148
Celanese
CE
$4.89B
| $2.57M | ﹤0.01% |
17,146
+9,959
| +139% | +$1.49M |
|
149
GSK
GSK
$79.3B
| $2.54M | ﹤0.01% |
71,245
-33,912
| -32% | -$1.21M |
|
150
Intuit
INTU
$187B
| $2.54M | ﹤0.01% |
6,622
+3,518
| +113% | +$1.35M |
|