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 | |
|---|---|---|---|---|---|---|
201
Arista Networks
ANET
$170B
| $2.46M | ﹤0.01% |
+24,044
|
|
||
202
Blackstone
BX
$112B
| $2.43M | ﹤0.01% |
16,222
-66,115
|
|
||
203
Cinemark Holdings
CNK
$3.53B
| $2.42M | ﹤0.01% |
+80,181
|
|
||
204
QuantumScape
QS
$8.8B
| $2.41M | ﹤0.01% |
358,479
-268,770
|
|
||
205
Hasbro
HAS
$11.1B
| $2.4M | ﹤0.01% |
+32,561
|
|
||
206
Bitwise Bitcoin ETF
BITB
$3.9B
| $2.4M | ﹤0.01% |
41,000
+32,547
|
|
||
207
Vanguard Real Estate ETF
VNQ
$33.9B
| $2.38M | ﹤0.01% |
+26,777
|
|
||
208
Avantor
AVTR
$7.87B
| $2.38M | ﹤0.01% |
+176,909
|
|
||
209
PPG Industries
PPG
$21.9B
| $2.38M | ﹤0.01% |
+20,932
|
|
||
210
United Rentals
URI
$54.8B
| $2.27M | ﹤0.01% |
+3,010
|
|
||
211
Semler Scientific
SMLR
$390M
| $2.25M | ﹤0.01% |
57,994
+46,337
|
|
||
|
EXK
212
Endeavour Silver
EXK
$2.4B
| $2.22M | ﹤0.01% |
+451,500
|
|
||
213
Wynn Resorts
WYNN
$13B
| $2.2M | ﹤0.01% |
23,488
-33,142
|
|
||
214
The Mosaic Company
MOS
$8.08B
| $2.2M | ﹤0.01% |
60,217
+18,084
|
|
||
215
Fastenal
FAST
$47B
| $2.19M | ﹤0.01% |
52,181
-5,831
|
|
||
216
RB Global
RBA
$18.9B
| $2.19M | ﹤0.01% |
+20,635
|
|
||
217
NextDecade
NEXT
$1.62B
| $2.17M | ﹤0.01% |
243,834
-185,488
|
|
||
218
Transmedics
TMDX
$4.07B
| $2.16M | ﹤0.01% |
16,149
-492
|
|
||
219
Stanley Black & Decker
SWK
$10.6B
| $2.15M | ﹤0.01% |
31,770
+5,020
|
|
||
220
Eldorado Gold
EGO
$5.81B
| $2.14M | ﹤0.01% |
105,375
+49,512
|
|
||
221
Harley-Davidson
HOG
$2.98B
| $2.14M | ﹤0.01% |
90,680
-10,471
|
|
||
222
Intuitive Machines
LUNR
$1.11B
| $2.12M | ﹤0.01% |
195,433
-64,921
|
|
||
223
Vanguard Long-Term Treasury ETF
VGLT
$10.2B
| $2.12M | ﹤0.01% |
37,837
+13,791
|
|
||
|
FL
224
DELISTED
Foot Locker
FL
| $2.12M | ﹤0.01% |
86,486
+38,129
|
|
||
225
Archer Aviation
ACHR
$5.63B
| $2.11M | ﹤0.01% |
194,914
-357,327
|
|