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 | |
|---|---|---|---|---|---|---|
1501
ATI
ATI
$10.5B
| $22K | ﹤0.01% |
905
+799
| +754% | +$19.4K |
|
1502
CBIZ
CBZ
$3.01B
| $22K | ﹤0.01% |
+994
| New | +$22K |
|
1503
ClearSign Technologies
CLIR
$29.7M
| $22K | ﹤0.01% |
11,289
+3,576
| +46% | +$6.97K |
|
1504
WisdomTree Emerging Markets SmallCap Dividend Fund
DGS
$1.68B
| $22K | ﹤0.01% |
478
-597
| -56% | -$27.5K |
|
1505
LG Display
LPL
$4.33B
| $22K | ﹤0.01% |
+2,695
| New | +$22K |
|
1506
nVent Electric
NVT
$15.3B
| $22K | ﹤0.01% |
+904
| New | +$22K |
|
|
ADAM
1507
Adamas Trust, Inc. Common Stock
ADAM
$653M
| $22K | ﹤0.01% |
921
+621
| +207% | +$14.8K |
|
1508
Perdoceo Education
PRDO
$2.16B
| $22K | ﹤0.01% |
1,419
-2,306
| -62% | -$35.8K |
|
1509
ProShares Trust UltraShort Lehman 7-10 Year Treasury
PST
$13.1M
| $22K | ﹤0.01% |
+976
| New | +$22K |
|
1510
REV Group
REVG
$3.06B
| $22K | ﹤0.01% |
+1,340
| New | +$22K |
|
1511
Skywest
SKYW
$4.37B
| $22K | ﹤0.01% |
442
-2,269
| -84% | -$113K |
|
1512
Teleflex
TFX
$5.76B
| $22K | ﹤0.01% |
83
-4,992
| -98% | -$1.32M |
|
|
VNTR
1513
DELISTED
Venator Materials PLC
VNTR
| $22K | ﹤0.01% |
1,365
-2,263
| -62% | -$36.5K |
|
|
MSGN
1514
DELISTED
MSG Networks Inc.
MSGN
| $22K | ﹤0.01% |
958
+819
| +589% | +$18.8K |
|
|
AYR
1515
DELISTED
Aircastle Limited
AYR
| $22K | ﹤0.01% |
1,101
-1,061
| -49% | -$21.2K |
|
|
WES
1516
DELISTED
Western Gas Partners Lp
WES
| $22K | ﹤0.01% |
468
-1,283
| -73% | -$60.3K |
|
1517
CoreCivic
CXW
$2.18B
| $21K | ﹤0.01% |
914
-9,683
| -91% | -$222K |
|
1518
Vaalco Energy
EGY
$416M
| $21K | ﹤0.01% |
+7,971
| New | +$21K |
|
1519
Inovio Pharmaceuticals
INO
$140M
| $21K | ﹤0.01% |
456
+216
| +90% | +$9.95K |
|
1520
Oceaneering
OII
$2.45B
| $21K | ﹤0.01% |
850
-8,475
| -91% | -$209K |
|
1521
Select Medical
SEM
$1.54B
| $21K | ﹤0.01% |
+2,170
| New | +$21K |
|
1522
VanEck Steel ETF
SLX
$83M
| $21K | ﹤0.01% |
483
+33
| +7% | +$1.44K |
|
1523
Titan International
TWI
$546M
| $21K | ﹤0.01% |
+2,031
| New | +$21K |
|
|
CALA
1524
DELISTED
Calithera Biosciences, Inc
CALA
| $21K | ﹤0.01% |
217
-456
| -68% | -$44.1K |
|
|
MCEP
1525
DELISTED
Mid-Con Energy Partners, LP
MCEP
| $21K | ﹤0.01% |
648
-1,536
| -70% | -$49.8K |
|