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 | |
|---|---|---|---|---|---|---|
726
Archrock
AROC
$4.35B
| $160K | 0.01% |
+18,304
| New | +$160K |
|
727
ProShares UltraShort Energy
DUG
$10.6M
| $160K | 0.01% |
+199
| New | +$160K |
|
728
MasterCraft Boat Holdings
MCFT
$366M
| $159K | 0.01% |
+6,335
| New | +$159K |
|
729
Supernus Pharmaceuticals
SUPN
$2.59B
| $159K | 0.01% |
3,474
-2,777
| -44% | -$127K |
|
730
BlackRock TCP Capital
TCPC
$602M
| $159K | 0.01% |
11,195
+8,360
| +295% | +$119K |
|
|
CTRL
731
DELISTED
Control4 Corporation
CTRL
| $159K | 0.01% |
7,443
+7,216
| +3,179% | +$154K |
|
732
Heidrick & Struggles
HSII
$1.02B
| $158K | 0.01% |
+5,076
| New | +$158K |
|
733
Super Micro Computer
SMCI
$26.1B
| $158K | 0.01% |
93,450
+64,420
| +222% | +$109K |
|
734
Telephone and Data Systems
TDS
$4.45B
| $158K | 0.01% |
5,659
+3,986
| +238% | +$111K |
|
735
ProShares UltraPro Dow 30
UDOW
$714M
| $158K | 0.01% |
3,744
+2,726
| +268% | +$115K |
|
736
Adtran
ADTN
$828M
| $157K | 0.01% |
10,115
+8,806
| +673% | +$137K |
|
|
STI
737
DELISTED
SunTrust Banks, Inc.
STI
| $157K | 0.01% |
+2,309
| New | +$157K |
|
|
GPT
738
DELISTED
Gramercy Property Trust
GPT
| $157K | 0.01% |
7,248
+7,214
| +21,218% | +$156K |
|
|
CNR
739
Core Natural Resources, Inc.
CNR
$3.74B
| $156K | 0.01% |
+5,390
| New | +$156K |
|
740
Mercury Systems
MRCY
$4.3B
| $155K | 0.01% |
+3,210
| New | +$155K |
|
741
ZTO Express
ZTO
$15.4B
| $154K | 0.01% |
10,320
+3,257
| +46% | +$48.6K |
|
|
CAI
742
DELISTED
CAI International, Inc.
CAI
| $154K | 0.01% |
7,284
+1,420
| +24% | +$30K |
|
743
Sibanye-Stillwater
SBSW
$6.11B
| $153K | 0.01% |
39,956
+28,144
| +238% | +$108K |
|
744
Skyworks Solutions
SWKS
$10.9B
| $153K | 0.01% |
1,534
-47,885
| -97% | -$4.78M |
|
745
Autohome
ATHM
$3.4B
| $152K | 0.01% |
+1,769
| New | +$152K |
|
746
Coherus Oncology, Inc. Common Stock
CHRS
$152M
| $152K | 0.01% |
13,833
-11,140
| -45% | -$122K |
|
747
FTAI Aviation
FTAI
$17.2B
| $152K | 0.01% |
11,231
+11,167
| +17,448% | +$151K |
|
|
DYN
748
DELISTED
Dynegy, Inc.
DYN
| $152K | 0.01% |
11,277
-67,940
| -86% | -$916K |
|
749
AeroVironment
AVAV
$12.3B
| $151K | 0.01% |
+3,334
| New | +$151K |
|
|
AVEO
750
DELISTED
AVEO Pharmaceuticals, Inc.
AVEO
| $151K | 0.01% |
5,237
+5,171
| +7,835% | +$149K |
|