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 |
Alphabet (Google) Class C
GOOG
|
$54.1M |
| 2 |
Apple
AAPL
|
$28.6M |
| 3 |
Meta Platforms (Facebook)
META
|
$16.5M |
| 4 |
IBM
IBM
|
$13.4M |
| 5 |
Baidu
BIDU
|
$10.3M |
Top Sells
| 1 |
SPDR S&P 500 ETF Trust
SPY
|
$9.89M |
| 2 |
McDonald's
MCD
|
$8.52M |
| 3 |
Ralph Lauren
RL
|
$5.22M |
| 4 |
Intel
INTC
|
$4.74M |
| 5 |
WBA
Walgreens Boots Alliance
WBA
|
$4.67M |
Sector Composition
| 1 | Communication Services | 22.01% |
| 2 | Technology | 15.83% |
| 3 | Healthcare | 11.95% |
| 4 | Consumer Discretionary | 9.73% |
| 5 | Financials | 7.98% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
|
SUNE
226
DELISTED
SUNEDISON, INC COM
SUNE
| $580K | 0.05% |
19,406
+41
| +0.2% | +$1.23K |
|
227
Trinity Industries
TRN
$2.31B
| $571K | 0.05% |
30,039
+15,884
| +112% | +$302K |
|
|
WUBA
228
DELISTED
58.COM INC
WUBA
| $569K | 0.05% |
+8,887
| New | +$569K |
|
229
Puma Biotechnology
PBYI
$253M
| $562K | 0.05% |
4,814
+3,110
| +183% | +$363K |
|
230
Alaska Air
ALK
$7.28B
| $556K | 0.05% |
8,642
+2,782
| +47% | +$179K |
|
231
iShare MSCI Eurozone ETF
EZU
$7.85B
| $549K | 0.05% |
+14,639
| New | +$549K |
|
|
DMND
232
DELISTED
DIAMOND FOODS, INC.
DMND
| $549K | 0.05% |
17,502
+16,195
| +1,239% | +$508K |
|
233
International Paper
IP
$25.7B
| $545K | 0.05% |
+12,094
| New | +$545K |
|
234
KLA
KLAC
$119B
| $545K | 0.05% |
9,700
-9,550
| -50% | -$537K |
|
|
ALXN
235
DELISTED
Alexion Pharmaceuticals Inc
ALXN
| $542K | 0.05% |
3,002
+133
| +5% | +$24K |
|
|
INXN
236
DELISTED
Interxion Holding N.V.
INXN
| $534K | 0.04% |
19,328
+16,272
| +532% | +$450K |
|
237
Domino's
DPZ
$15.7B
| $531K | 0.04% |
4,691
+4,088
| +678% | +$463K |
|
238
JetBlue
JBLU
$1.85B
| $529K | 0.04% |
25,512
+17,940
| +237% | +$372K |
|
239
Sealed Air
SEE
$4.82B
| $522K | 0.04% |
10,174
+4,895
| +93% | +$251K |
|
240
CACI
CACI
$10.4B
| $513K | 0.04% |
+6,351
| New | +$513K |
|
|
QLTY
241
DELISTED
QUALITY DISTR INC FLA
QLTY
| $509K | 0.04% |
+32,943
| New | +$509K |
|
242
United Airlines
UAL
$34.5B
| $503K | 0.04% |
+9,498
| New | +$503K |
|
243
Microchip Technology
MCHP
$35.6B
| $496K | 0.04% |
+20,934
| New | +$496K |
|
244
Kroger
KR
$44.8B
| $492K | 0.04% |
13,584
+8,304
| +157% | +$301K |
|
|
CHL
245
DELISTED
China Mobile Limited
CHL
| $491K | 0.04% |
7,662
+6,802
| +791% | +$436K |
|
246
Acadia Healthcare
ACHC
$2.19B
| $488K | 0.04% |
6,241
+5,585
| +851% | +$437K |
|
247
Banco Santander
SAN
$141B
| $488K | 0.04% |
+73,372
| New | +$488K |
|
248
Dynavax Technologies
DVAX
$1.18B
| $487K | 0.04% |
+20,798
| New | +$487K |
|
|
P
249
DELISTED
Pandora Media Inc
P
| $483K | 0.04% |
31,136
+25,724
| +475% | +$399K |
|
250
iShares MSCI Japan Small-Cap ETF
SCJ
$147M
| $481K | 0.04% |
+8,155
| New | +$481K |
|