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 |
Apple
AAPL
|
+$35.2M |
| 2 |
Micron Technology
MU
|
+$32.9M |
| 3 |
Berkshire Hathaway Class B
BRK.B
|
+$29.5M |
| 4 |
NVIDIA
NVDA
|
+$22.9M |
| 5 |
SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$22M |
Top Sells
| 1 |
TWX
Time Warner Inc
TWX
|
+$34.8M |
| 2 |
Amazon
AMZN
|
+$33.4M |
| 3 |
Tesla
TSLA
|
+$19.8M |
| 4 |
Netflix
NFLX
|
+$17.7M |
| 5 |
TWTR
Twitter, Inc.
TWTR
|
+$13.5M |
Sector Composition
| 1 | Technology | 20.43% |
| 2 | Consumer Discretionary | 15.24% |
| 3 | Communication Services | 12% |
| 4 | Financials | 10.18% |
| 5 | Industrials | 9.87% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
726
Ionis Pharmaceuticals
IONS
$10.3B
| $208K | ﹤0.01% |
5,015
-12,072
| -71% | -$501K |
|
|
NFX
727
DELISTED
Newfield Exploration
NFX
| $208K | ﹤0.01% |
6,894
-22,024
| -76% | -$664K |
|
728
Aurinia Pharmaceuticals
AUPH
$1.63B
| $207K | ﹤0.01% |
36,768
+20,162
| +121% | +$114K |
|
729
iShares US Medical Devices ETF
IHI
$4.35B
| $206K | ﹤0.01% |
6,174
+5,382
| +680% | +$180K |
|
730
Rapid7
RPD
$1.32B
| $206K | ﹤0.01% |
+7,323
| New | +$206K |
|
731
ProShares Ultra Silver
AGQ
$889M
| $204K | ﹤0.01% |
6,909
+911
| +15% | +$26.9K |
|
|
DSKE
732
DELISTED
Daseke, Inc. Common Stock
DSKE
| $204K | ﹤0.01% |
20,591
+12,531
| +155% | +$124K |
|
733
Veeco
VECO
$1.49B
| $203K | ﹤0.01% |
+14,312
| New | +$203K |
|
|
RAD
734
DELISTED
Rite Aid Corporation
RAD
| $203K | ﹤0.01% |
5,877
-3,114
| -35% | -$108K |
|
|
TRTN
735
DELISTED
Triton International Limited
TRTN
| $203K | ﹤0.01% |
6,639
-7,616
| -53% | -$233K |
|
|
JNCE
736
DELISTED
Jounce Therapeutics, Inc. Common Stock
JNCE
| $203K | ﹤0.01% |
26,528
+22,754
| +603% | +$174K |
|
737
Avis
CAR
$5.56B
| $202K | ﹤0.01% |
+6,238
| New | +$202K |
|
738
Logitech
LOGI
$15.9B
| $202K | ﹤0.01% |
+4,607
| New | +$202K |
|
739
Toll Brothers
TOL
$14B
| $202K | ﹤0.01% |
5,475
-6,577
| -55% | -$243K |
|
|
CAI
740
DELISTED
CAI International, Inc.
CAI
| $202K | ﹤0.01% |
8,718
+1,434
| +20% | +$33.2K |
|
741
Cognex
CGNX
$7.45B
| $201K | ﹤0.01% |
+4,523
| New | +$201K |
|
742
Permian Resources
PR
$9.66B
| $200K | ﹤0.01% |
11,119
+6,306
| +131% | +$113K |
|
|
ALDR
743
DELISTED
Alder Biopharmaceuticals, Inc.
ALDR
| $199K | ﹤0.01% |
+12,614
| New | +$199K |
|
744
Calix
CALX
$4.03B
| $198K | ﹤0.01% |
25,392
-39,790
| -61% | -$310K |
|
745
Fossil Group
FOSL
$159M
| $198K | ﹤0.01% |
+7,403
| New | +$198K |
|
|
EBIX
746
DELISTED
Ebix Inc
EBIX
| $198K | ﹤0.01% |
+2,608
| New | +$198K |
|
747
Canadian National Railway
CNI
$58.2B
| $197K | ﹤0.01% |
+2,418
| New | +$197K |
|
748
Stitch Fix
SFIX
$761M
| $197K | ﹤0.01% |
7,203
-8,828
| -55% | -$241K |
|
|
FSCT
749
DELISTED
ForeScout Technologies, Inc. Common Stock
FSCT
| $197K | ﹤0.01% |
+5,775
| New | +$197K |
|
750
Suburban Propane Partners
SPH
$1.2B
| $195K | ﹤0.01% |
8,322
+5,799
| +230% | +$136K |
|