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 | |
|---|---|---|---|---|---|---|
51
Newmont
NEM
$102B
| $11.4M | 0.01% |
196,522
-131,879
|
|
||
52
PG&E
PCG
$36.9B
| $11.2M | 0.01% |
+799,868
|
|
||
53
AST SpaceMobile
ASTS
$17.9B
| $10.9M | 0.01% |
233,885
-75,213
|
|
||
54
Humana
HUM
$28.9B
| $10.9M | 0.01% |
44,637
-17,035
|
|
||
55
Target
TGT
$41.8B
| $10.8M | 0.01% |
109,894
+31,793
|
|
||
56
SLB Ltd
SLB
$53.9B
| $10.8M | 0.01% |
318,601
+58,562
|
|
||
57
Baidu
BIDU
$44.3B
| $10.7M | 0.01% |
124,357
-204,568
|
|
||
58
Moderna
MRNA
$10.4B
| $10.5M | 0.01% |
381,787
+190,557
|
|
||
59
Mercado Libre
MELI
$107B
| $10.5M | 0.01% |
4,010
+214
|
|
||
60
Citigroup
C
$184B
| $10.5M | 0.01% |
123,006
-396,031
|
|
||
61
Marvell Technology
MRVL
$77B
| $9.97M | 0.01% |
+128,883
|
|
||
62
Adobe
ADBE
$141B
| $9.91M | 0.01% |
+25,630
|
|
||
63
Direxion Daily TSLA Bull 2X Shares
TSLL
$7.38B
| $9.64M | 0.01% |
816,632
+544,253
|
|
||
64
American Airlines Group
AAL
$8.88B
| $9.55M | 0.01% |
851,320
+373,085
|
|
||
65
Delta Air Lines
DAL
$39.5B
| $9.35M | 0.01% |
+190,017
|
|
||
66
Crown Castle
CCI
$40.8B
| $9.31M | 0.01% |
90,620
+28,088
|
|
||
67
NRG Energy
NRG
$32.4B
| $9.31M | 0.01% |
57,955
+15,575
|
|
||
68
Amazon
AMZN
$2.61T
| $8.55M | ﹤0.01% |
38,978
-242,180
|
|
||
69
NextEra Energy
NEE
$179B
| $8.38M | ﹤0.01% |
120,670
+95,806
|
|
||
70
Qualcomm
QCOM
$189B
| $8.03M | ﹤0.01% |
+50,398
|
|
||
71
Dell
DELL
$94.3B
| $7.9M | ﹤0.01% |
64,474
-189,459
|
|
||
72
Centene
CNC
$17.8B
| $7.7M | ﹤0.01% |
141,894
+136,020
|
|
||
73
Kenvue
KVUE
$31.9B
| $7.66M | ﹤0.01% |
366,113
+189,525
|
|
||
74
Materials Select Sector SPDR Fund
XLB
$5.45B
| $7.63M | ﹤0.01% |
86,906
+14,961
|
|
||
75
TransDigm Group
TDG
$73.7B
| $7.55M | ﹤0.01% |
4,966
+4,718
|
|