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 |
Invesco QQQ Trust
QQQ
|
$92M |
| 2 |
Walt Disney
DIS
|
$25.4M |
| 3 |
Alphabet (Google) Class A
GOOGL
|
$12.8M |
| 4 |
Baidu
BIDU
|
$12.2M |
| 5 |
RHT
Red Hat Inc
RHT
|
$11.6M |
Top Sells
| 1 |
iShares Russell 2000 ETF
IWM
|
$61.4M |
| 2 |
Amazon
AMZN
|
$59.6M |
| 3 |
Alphabet (Google) Class C
GOOG
|
$35.5M |
| 4 |
Apple
AAPL
|
$19.6M |
| 5 |
Financial Select Sector SPDR Fund
XLF
|
$18.2M |
Sector Composition
| 1 | Communication Services | 16.98% |
| 2 | Technology | 12.42% |
| 3 | Healthcare | 10.02% |
| 4 | Consumer Discretionary | 8.53% |
| 5 | Industrials | 6.02% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
426
nLIGHT
LASR
$1.44B
| $462K | ﹤0.01% |
20,755
+14,720
| +244% | +$328K |
|
|
WBT
427
DELISTED
Welbilt, Inc.
WBT
| $460K | ﹤0.01% |
28,104
-29,188
| -51% | -$478K |
|
428
Digital Turbine
APPS
$483M
| $459K | ﹤0.01% |
131,366
+126,807
| +2,781% | +$443K |
|
429
Inspire Medical Systems
INSP
$2.56B
| $458K | ﹤0.01% |
+8,075
| New | +$458K |
|
430
Mitek Systems
MITK
$448M
| $457K | ﹤0.01% |
+37,413
| New | +$457K |
|
431
Equifax
EFX
$30.8B
| $455K | ﹤0.01% |
3,847
+2,561
| +199% | +$303K |
|
432
iShares Core S&P Total US Stock Market ETF
ITOT
$75.5B
| $454K | ﹤0.01% |
7,056
+2,738
| +63% | +$176K |
|
433
ASGN Inc
ASGN
$2.32B
| $453K | ﹤0.01% |
+7,140
| New | +$453K |
|
434
Antero Midstream
AM
$8.73B
| $451K | ﹤0.01% |
32,768
+32,289
| +6,741% | +$444K |
|
435
BioMarin Pharmaceuticals
BMRN
$11.1B
| $448K | ﹤0.01% |
5,051
+381
| +8% | +$33.8K |
|
436
MBIA
MBI
$377M
| $445K | ﹤0.01% |
+46,750
| New | +$445K |
|
437
Ecolab
ECL
$77.6B
| $440K | ﹤0.01% |
+2,497
| New | +$440K |
|
438
GDS Holdings
GDS
$6.35B
| $440K | ﹤0.01% |
12,349
+2,777
| +29% | +$98.9K |
|
|
TBCH
439
Turtle Beach Corporation Common Stock
TBCH
$305M
| $439K | ﹤0.01% |
38,708
+38,425
| +13,578% | +$436K |
|
|
PFPT
440
DELISTED
Proofpoint, Inc.
PFPT
| $438K | ﹤0.01% |
3,609
-3,873
| -52% | -$470K |
|
441
Global X Uranium ETF
URA
$4.17B
| $437K | ﹤0.01% |
35,048
-2,246
| -6% | -$28K |
|
442
Simpson Manufacturing
SSD
$8.15B
| $434K | ﹤0.01% |
7,323
+3,960
| +118% | +$235K |
|
|
BLUE
443
DELISTED
bluebird bio
BLUE
| $432K | ﹤0.01% |
212
-469
| -69% | -$956K |
|
|
FRC
444
DELISTED
First Republic Bank
FRC
| $432K | ﹤0.01% |
+4,302
| New | +$432K |
|
445
ProShares UltraShort MSCI Brazil Capped
BZQ
$5.55M
| $430K | ﹤0.01% |
+3,725
| New | +$430K |
|
|
GG
446
DELISTED
Goldcorp Inc
GG
| $429K | ﹤0.01% |
37,535
-35,691
| -49% | -$408K |
|
|
REV
447
DELISTED
Revlon, Inc.
REV
| $427K | ﹤0.01% |
22,047
+19,589
| +797% | +$379K |
|
|
NPTN
448
DELISTED
NEOPHOTONICS CORP
NPTN
| $425K | ﹤0.01% |
67,626
+19,251
| +40% | +$121K |
|
|
WMGI
449
DELISTED
Wright Medical Group Inc
WMGI
| $425K | ﹤0.01% |
13,530
+6,152
| +83% | +$193K |
|
450
Direxion Daily 20+ Year Treasury Bear 3X Shares
TMV
$166M
| $424K | ﹤0.01% |
10,594
-10,444
| -50% | -$418K |
|