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 |
Tesla
TSLA
|
$27.1M |
| 2 |
Netflix
NFLX
|
$24.7M |
| 3 |
SPDR Dow Jones Industrial Average ETF Trust
DIA
|
$20.1M |
| 4 |
TWX
Time Warner Inc
TWX
|
$18.3M |
| 5 |
Alibaba
BABA
|
$14.8M |
Top Sells
| 1 |
Amazon
AMZN
|
$71.9M |
| 2 |
Micron Technology
MU
|
$47.7M |
| 3 |
Alphabet (Google) Class C
GOOG
|
$26.3M |
| 4 |
Boeing
BA
|
$21M |
| 5 |
Citigroup
C
|
$19.6M |
Sector Composition
| 1 | Consumer Discretionary | 15.64% |
| 2 | Communication Services | 14.16% |
| 3 | Technology | 12.46% |
| 4 | Financials | 10.94% |
| 5 | Healthcare | 10.33% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
126
iShares Expanded Tech-Software Sector ETF
IGV
$9.77B
| $1.66M | 0.07% |
48,965
+20,900
| +74% | +$709K |
|
127
iShares Russell 2000 ETF
IWM
$66.6B
| $1.63M | 0.07% |
10,730
-61,658
| -85% | -$9.36M |
|
128
L3Harris
LHX
$51.1B
| $1.58M | 0.07% |
+9,782
| New | +$1.58M |
|
|
ANDV
129
DELISTED
Andeavor
ANDV
| $1.58M | 0.07% |
15,678
-38,198
| -71% | -$3.84M |
|
|
MNDT
130
DELISTED
Mandiant, Inc. Common Stock
MNDT
| $1.57M | 0.07% |
92,840
-41,697
| -31% | -$706K |
|
131
ProShares Ultra QQQ
QLD
$8.89B
| $1.56M | 0.07% |
+81,688
| New | +$1.56M |
|
132
Take-Two Interactive
TTWO
$44.1B
| $1.56M | 0.07% |
15,923
-25,084
| -61% | -$2.45M |
|
133
Essex Property Trust
ESS
$16.8B
| $1.55M | 0.07% |
6,436
+5,617
| +686% | +$1.35M |
|
134
Eastman Chemical
EMN
$7.76B
| $1.53M | 0.07% |
+14,450
| New | +$1.53M |
|
|
SINA
135
DELISTED
Sina Corp
SINA
| $1.52M | 0.07% |
14,587
+5,442
| +60% | +$567K |
|
136
T-Mobile US
TMUS
$284B
| $1.51M | 0.07% |
24,686
+6,004
| +32% | +$366K |
|
137
Restaurant Brands International
QSR
$20.5B
| $1.5M | 0.07% |
26,361
+26,260
| +26,000% | +$1.49M |
|
138
United Airlines
UAL
$34.4B
| $1.5M | 0.07% |
21,528
-137,165
| -86% | -$9.53M |
|
139
KraneShares CSI China Internet ETF
KWEB
$8.51B
| $1.49M | 0.07% |
24,206
-5,320
| -18% | -$327K |
|
140
Direxion Daily Financial Bull 3x Shares
FAS
$2.66B
| $1.47M | 0.06% |
+22,920
| New | +$1.47M |
|
141
ServiceNow
NOW
$191B
| $1.46M | 0.06% |
+8,846
| New | +$1.46M |
|
|
ILG
142
DELISTED
ILG, Inc Common Stock
ILG
| $1.42M | 0.06% |
45,562
+21,945
| +93% | +$683K |
|
143
Marvell Technology
MRVL
$53.7B
| $1.41M | 0.06% |
66,920
+35,990
| +116% | +$756K |
|
144
Cardinal Health
CAH
$36B
| $1.38M | 0.06% |
+22,086
| New | +$1.38M |
|
145
TransDigm Group
TDG
$72B
| $1.38M | 0.06% |
+4,503
| New | +$1.38M |
|
146
RTX Corp
RTX
$212B
| $1.38M | 0.06% |
+17,447
| New | +$1.38M |
|
147
CoStar Group
CSGP
$37.2B
| $1.38M | 0.06% |
37,940
+36,150
| +2,020% | +$1.31M |
|
148
SolarEdge
SEDG
$1.97B
| $1.38M | 0.06% |
+26,147
| New | +$1.38M |
|
149
Simon Property Group
SPG
$58.7B
| $1.36M | 0.06% |
8,808
-3,460
| -28% | -$534K |
|
150
General Mills
GIS
$26.6B
| $1.35M | 0.06% |
29,931
+10,314
| +53% | +$465K |
|