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 | |
|---|---|---|---|---|---|---|
251
NexGen Energy
NXE
$5.54B
| $1.94M | ﹤0.01% |
280,171
-29,787
|
|
||
252
Edison International
EIX
$22.6B
| $1.93M | ﹤0.01% |
37,487
-139,393
|
|
||
|
SNDK
253
Sandisk
SNDK
$41.5B
| $1.92M | ﹤0.01% |
42,337
+21,184
|
|
||
254
Hecla Mining
HL
$10.4B
| $1.92M | ﹤0.01% |
319,855
+81,994
|
|
||
255
Akamai
AKAM
$13B
| $1.91M | ﹤0.01% |
+23,968
|
|
||
|
PONY
256
Pony AI Inc
PONY
$6B
| $1.9M | ﹤0.01% |
+144,207
|
|
||
257
Golar LNG
GLNG
$3.9B
| $1.9M | ﹤0.01% |
46,102
+1,780
|
|
||
258
Enovix
ENVX
$1.8B
| $1.9M | ﹤0.01% |
209,678
-343,748
|
|
||
|
ARI
259
Apollo Commercial Real Estate
ARI
$1.37B
| $1.9M | ﹤0.01% |
195,979
-1,018
|
|
||
260
NCR Voyix
VYX
$1.55B
| $1.89M | ﹤0.01% |
161,388
+117,634
|
|
||
261
Conagra Brands
CAG
$8.29B
| $1.88M | ﹤0.01% |
91,812
+51,578
|
|
||
262
Darling Ingredients
DAR
$5.46B
| $1.88M | ﹤0.01% |
49,433
+2,163
|
|
||
263
DoorDash
DASH
$84.7B
| $1.87M | ﹤0.01% |
7,577
-58,394
|
|
||
|
EH
264
EHang Holdings
EH
$1.16B
| $1.84M | ﹤0.01% |
106,291
-13,908
|
|
||
265
Noble Corp
NE
$4.7B
| $1.83M | ﹤0.01% |
69,143
-3,418
|
|
||
266
Blackstone Mortgage Trust
BXMT
$3.09B
| $1.81M | ﹤0.01% |
94,078
+3,940
|
|
||
267
Targa Resources
TRGP
$36.6B
| $1.81M | ﹤0.01% |
+10,377
|
|
||
268
Magna International
MGA
$14.2B
| $1.8M | ﹤0.01% |
46,586
-8,032
|
|
||
269
Kodak
KODK
$809M
| $1.79M | ﹤0.01% |
317,851
+87,703
|
|
||
270
iShares US Aerospace & Defense ETF
ITA
$11.5B
| $1.79M | ﹤0.01% |
9,514
-389
|
|
||
271
Direxion Daily S&P 500 Bull 3x Shares
SPXL
$5.96B
| $1.78M | ﹤0.01% |
+10,277
|
|
||
272
ASP Isotopes
ASPI
$981M
| $1.77M | ﹤0.01% |
240,150
+237,572
|
|
||
273
Bath & Body Works
BBWI
$4.62B
| $1.76M | ﹤0.01% |
58,755
+18,731
|
|
||
274
HubSpot
HUBS
$20.7B
| $1.74M | ﹤0.01% |
3,128
+2,364
|
|
||
275
Merck
MRK
$227B
| $1.74M | ﹤0.01% |
+21,992
|
|