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 | +$216M | |
| 2 | +$159M | |
| 3 | +$128M | |
| 4 |
Booking.com
BKNG
|
+$62.2M |
| 5 |
SPDR S&P 500 ETF Trust
SPY
|
+$61.9M |
Top Sells
| 1 | +$141M | |
| 2 | +$53.1M | |
| 3 | +$45.7M | |
| 4 |
Netflix
NFLX
|
+$45.3M |
| 5 |
Pfizer
PFE
|
+$38.3M |
Sector Composition
| 1 | Technology | 34.74% |
| 2 | Communication Services | 9% |
| 3 | Consumer Discretionary | 8.67% |
| 4 | Healthcare | 8.07% |
| 5 | Financials | 6.38% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
176
Gilead Sciences
GILD
$153B
| $2.95M | ﹤0.01% |
+26,577
|
|
||
177
Norwegian Cruise Line
NCLH
$8.62B
| $2.92M | ﹤0.01% |
+143,802
|
|
||
178
monday.com
MNDY
$8.2B
| $2.9M | ﹤0.01% |
9,234
+7,112
|
|
||
179
EQT Corp
EQT
$38B
| $2.87M | ﹤0.01% |
+49,291
|
|
||
180
Planet Fitness
PLNT
$8.61B
| $2.87M | ﹤0.01% |
26,363
+13,314
|
|
||
181
Novartis
NVS
$254B
| $2.87M | ﹤0.01% |
+23,703
|
|
||
182
Robert Half
RHI
$2.8B
| $2.85M | ﹤0.01% |
+69,468
|
|
||
183
Ally Financial
ALLY
$12.4B
| $2.81M | ﹤0.01% |
+72,167
|
|
||
184
Sempra
SRE
$60.4B
| $2.77M | ﹤0.01% |
36,497
+28,429
|
|
||
185
Viking Therapeutics
VKTX
$4.61B
| $2.75M | ﹤0.01% |
103,820
-18,935
|
|
||
186
Energy Fuels
UUUU
$3.75B
| $2.75M | ﹤0.01% |
477,576
+90,337
|
|
||
187
Marathon Petroleum
MPC
$59.2B
| $2.74M | ﹤0.01% |
16,498
-2,128
|
|
||
188
Civitas Resources
CIVI
$2.38B
| $2.69M | ﹤0.01% |
97,895
+79,347
|
|
||
|
FLG
189
Flagstar Bank National Association
FLG
$4.59B
| $2.69M | ﹤0.01% |
254,125
+92,238
|
|
||
190
Vanguard FTSE Europe ETF
VGK
$28.1B
| $2.67M | ﹤0.01% |
34,405
+24,903
|
|
||
191
Tenet Healthcare
THC
$17.6B
| $2.66M | ﹤0.01% |
15,110
+11,346
|
|
||
192
BJs Wholesale Club
BJ
$12.3B
| $2.6M | ﹤0.01% |
24,081
+15,812
|
|
||
193
Mirion Technologies
MIR
$6.68B
| $2.56M | ﹤0.01% |
118,949
+87,579
|
|
||
194
Norfolk Southern
NSC
$64.3B
| $2.55M | ﹤0.01% |
9,961
+7,621
|
|
||
195
UroGen Pharma
URGN
$1.18B
| $2.53M | ﹤0.01% |
185,030
+184,698
|
|
||
196
DexCom
DXCM
$23.2B
| $2.49M | ﹤0.01% |
28,566
-5,247
|
|
||
197
Solventum
SOLV
$12.8B
| $2.49M | ﹤0.01% |
32,783
+25,237
|
|
||
198
ACM Research
ACMR
$2.19B
| $2.48M | ﹤0.01% |
95,710
-14,418
|
|
||
199
Kyndryl
KD
$6.01B
| $2.47M | ﹤0.01% |
58,798
-26,215
|
|
||
200
Teck Resources
TECK
$21.3B
| $2.46M | ﹤0.01% |
61,003
-19,302
|
|