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 |
LNKD
LinkedIn Corporation
LNKD
|
$29.3M |
| 2 |
SPDR Gold Trust
GLD
|
$18.1M |
| 3 |
QIHU
QIHOO 360 TECHNOLOGY CO LTD ADS RPSTG 3 CL A SHS
QIHU
|
$14.9M |
| 4 |
Biogen
BIIB
|
$13.7M |
| 5 |
Visa
V
|
$13.3M |
Top Sells
| 1 |
Broadcom
AVGO
|
$37.4M |
| 2 |
Alphabet (Google) Class C
GOOG
|
$20.1M |
| 3 |
iShares MSCI Emerging Markets ETF
EEM
|
$15.8M |
| 4 |
Citigroup
C
|
$13.9M |
| 5 |
SPDR S&P MidCap 400 ETF Trust
MDY
|
$12.9M |
Sector Composition
| 1 | Communication Services | 12.51% |
| 2 | Healthcare | 12.38% |
| 3 | Technology | 12.22% |
| 4 | Consumer Discretionary | 8.59% |
| 5 | Financials | 8.53% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
176
Aon
AON
$79.9B
| $903K | 0.06% |
+8,276
| New | +$903K |
|
177
Idexx Laboratories
IDXX
$51.4B
| $903K | 0.06% |
9,725
+9,473
| +3,759% | +$880K |
|
|
B
178
Barrick Mining Corporation
B
$48.5B
| $900K | 0.06% |
+42,199
| New | +$900K |
|
|
EGN
179
DELISTED
Energen
EGN
| $894K | 0.06% |
18,564
+493
| +3% | +$23.7K |
|
|
HTWR
180
DELISTED
HEARTWARE INTERNATIONAL INC COM STK (DE)
HTWR
| $894K | 0.06% |
15,483
+13,598
| +721% | +$785K |
|
181
Spectrum Brands
SPB
$1.38B
| $890K | 0.06% |
7,464
+4,594
| +160% | +$548K |
|
182
Motorola Solutions
MSI
$79.8B
| $886K | 0.06% |
+13,442
| New | +$886K |
|
|
GAS
183
DELISTED
AGL RESOURCES INC (HOLDING CO)
GAS
| $884K | 0.06% |
13,401
+5,339
| +66% | +$352K |
|
184
Rockwell Automation
ROK
$38.2B
| $869K | 0.06% |
7,575
+2,914
| +63% | +$334K |
|
185
Weibo
WB
$2.87B
| $869K | 0.06% |
30,620
+23,152
| +310% | +$657K |
|
186
GameStop
GME
$10.1B
| $866K | 0.06% |
+130,380
| New | +$866K |
|
187
Bank of New York Mellon
BK
$73.1B
| $857K | 0.06% |
22,063
+20,655
| +1,467% | +$802K |
|
188
Mohawk Industries
MHK
$8.65B
| $855K | 0.06% |
4,509
-150
| -3% | -$28.4K |
|
189
CME Group
CME
$94.4B
| $852K | 0.06% |
+8,752
| New | +$852K |
|
190
Televisa
TV
$1.56B
| $851K | 0.06% |
32,713
+31,561
| +2,740% | +$821K |
|
191
Aptiv
APTV
$17.5B
| $849K | 0.06% |
13,577
+13,139
| +3,000% | +$822K |
|
|
BBBY
192
DELISTED
Bed Bath & Beyond Inc
BBBY
| $848K | 0.06% |
19,628
+19,154
| +4,041% | +$828K |
|
193
Foot Locker
FL
$2.29B
| $843K | 0.06% |
+15,368
| New | +$843K |
|
|
SAGE
194
DELISTED
Sage Therapeutics
SAGE
| $842K | 0.06% |
+27,970
| New | +$842K |
|
|
IHS
195
DELISTED
IHS INC CL-A COM STK
IHS
| $842K | 0.06% |
+7,290
| New | +$842K |
|
196
Acadia Healthcare
ACHC
$2.19B
| $830K | 0.06% |
14,998
+12,995
| +649% | +$719K |
|
197
Suncor Energy
SU
$48.5B
| $826K | 0.06% |
+29,791
| New | +$826K |
|
|
ALR
198
DELISTED
Alere Inc
ALR
| $825K | 0.06% |
19,799
-2,413
| -11% | -$101K |
|
199
Alnylam Pharmaceuticals
ALNY
$59.2B
| $818K | 0.05% |
14,750
+7,648
| +108% | +$424K |
|
|
SOHU
200
Sohu.com
SOHU
$467M
| $818K | 0.05% |
21,611
+9,661
| +81% | +$366K |
|