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
|
$41.4M |
| 2 |
Berkshire Hathaway Class B
BRK.B
|
$12.3M |
| 3 |
SPDR S&P 500 ETF Trust
SPY
|
$9.89M |
| 4 |
Alibaba
BABA
|
$9.66M |
| 5 |
Intel
INTC
|
$9.11M |
Top Sells
| 1 |
Apple
AAPL
|
$36.8M |
| 2 |
Gilead Sciences
GILD
|
$31.2M |
| 3 |
Booking.com
BKNG
|
$29M |
| 4 |
Amazon
AMZN
|
$25.6M |
| 5 |
Baidu
BIDU
|
$12.9M |
Sector Composition
| 1 | Communication Services | 13.31% |
| 2 | Consumer Discretionary | 13.07% |
| 3 | Healthcare | 12.41% |
| 4 | Technology | 11.91% |
| 5 | Financials | 8.28% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
276
Prothena Corp
PRTA
$460M
| $345K | 0.04% |
9,060
+505
| +6% | +$19.2K |
|
277
Packaging Corp of America
PKG
$19.8B
| $344K | 0.04% |
4,403
-1,052
| -19% | -$82.2K |
|
|
278
Apple
AAPL
$3.56T
| $342K | 0.04% |
11,000
-1,182,152
| -99% | -$36.8M |
|
279
Kimberly-Clark
KMB
$43.1B
| $342K | 0.04% |
3,197
-533
| -14% | -$57K |
|
|
CERN
280
DELISTED
Cerner Corp
CERN
| $339K | 0.04% |
+4,632
| New | +$339K |
|
281
Agilent Technologies
A
$36.5B
| $338K | 0.04% |
+8,156
| New | +$338K |
|
282
Advanced Micro Devices
AMD
$245B
| $338K | 0.04% |
+126,412
| New | +$338K |
|
283
Bank of Montreal
BMO
$90.3B
| $338K | 0.04% |
5,638
+3,499
| +164% | +$210K |
|
284
Meritage Homes
MTH
$5.89B
| $336K | 0.04% |
+13,826
| New | +$336K |
|
|
ICON
285
DELISTED
Iconix Brand Group, Inc.
ICON
| $335K | 0.04% |
996
-724
| -42% | -$244K |
|
286
SPDR Euro Stoxx 50 ETF
FEZ
$4.52B
| $334K | 0.04% |
8,610
+6,006
| +231% | +$233K |
|
287
Incyte
INCY
$16.9B
| $334K | 0.04% |
3,651
+1,282
| +54% | +$117K |
|
288
Ciena
CIEN
$16.5B
| $333K | 0.04% |
17,250
+10,336
| +149% | +$200K |
|
|
GFIG
289
DELISTED
GFI GROUP INC
GFIG
| $333K | 0.04% |
56,215
+53,461
| +1,941% | +$317K |
|
|
ATML
290
DELISTED
ATMEL CORP
ATML
| $331K | 0.04% |
40,300
+1,044
| +3% | +$8.58K |
|
291
NCR Voyix
VYX
$1.84B
| $328K | 0.04% |
18,160
-6,802
| -27% | -$123K |
|
|
ASPX
292
DELISTED
AUSPEX PHARMACEUTICALS INC COM STK (DE)
ASPX
| $328K | 0.04% |
+3,272
| New | +$328K |
|
|
GWPH
293
DELISTED
GW Pharmaceuticals Plc American Depositary Shares
GWPH
| $327K | 0.04% |
+3,589
| New | +$327K |
|
294
DaVita
DVA
$9.86B
| $325K | 0.04% |
4,002
+1,396
| +54% | +$113K |
|
295
Devon Energy
DVN
$22.1B
| $325K | 0.04% |
5,403
-51,477
| -91% | -$3.1M |
|
296
Targa Resources
TRGP
$34.9B
| $325K | 0.04% |
+3,400
| New | +$325K |
|
297
Cheniere Energy
LNG
$51.8B
| $322K | 0.04% |
4,165
-29,278
| -88% | -$2.26M |
|
298
Antero Resources
AR
$10.1B
| $321K | 0.04% |
9,110
-961
| -10% | -$33.9K |
|
299
Dover
DOV
$24.4B
| $320K | 0.04% |
5,742
+2,120
| +59% | +$118K |
|
300
HF Sinclair
DINO
$9.56B
| $319K | 0.04% |
7,937
-3,509
| -31% | -$141K |
|