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 | |
|---|---|---|---|---|---|---|
1451
RLI Corp
RLI
$6.15B
| $26K | ﹤0.01% |
+796
| New | +$26K |
|
1452
SIGA Technologies
SIGA
$649M
| $26K | ﹤0.01% |
+4,384
| New | +$26K |
|
|
TSS
1453
DELISTED
Total System Services, Inc.
TSS
| $26K | ﹤0.01% |
+314
| New | +$26K |
|
1454
Andersons Inc
ANDE
$1.4B
| $25K | ﹤0.01% |
737
+231
| +46% | +$7.84K |
|
1455
Chord Energy
CHRD
$6B
| $25K | ﹤0.01% |
1,982
-6,127
| -76% | -$77.3K |
|
1456
Costamare
CMRE
$1.47B
| $25K | ﹤0.01% |
+3,211
| New | +$25K |
|
1457
Freshpet
FRPT
$2.6B
| $25K | ﹤0.01% |
+916
| New | +$25K |
|
1458
Cedar Fair
FUN
$2.2B
| $25K | ﹤0.01% |
401
-638
| -61% | -$39.8K |
|
1459
Genesis Energy
GEL
$2.02B
| $25K | ﹤0.01% |
+1,151
| New | +$25K |
|
1460
Pediatrix Medical
MD
$1.48B
| $25K | ﹤0.01% |
599
-2,409
| -80% | -$101K |
|
1461
Oaktree Specialty Lending
OCSL
$1.22B
| $25K | ﹤0.01% |
1,802
+460
| +34% | +$6.38K |
|
1462
Silicon Laboratories
SLAB
$4.45B
| $25K | ﹤0.01% |
+258
| New | +$25K |
|
1463
Tri Pointe Homes
TPH
$3.18B
| $25K | ﹤0.01% |
1,569
+1,194
| +318% | +$19K |
|
|
CHS
1464
DELISTED
Chicos FAS, Inc.
CHS
| $25K | ﹤0.01% |
3,127
+990
| +46% | +$7.92K |
|
|
NPTN
1465
DELISTED
NEOPHOTONICS CORP
NPTN
| $25K | ﹤0.01% |
4,136
-6,073
| -59% | -$36.7K |
|
|
DGL
1466
DELISTED
Invesco DB Gold Fund
DGL
| $25K | ﹤0.01% |
650
-1,757
| -73% | -$67.6K |
|
1467
Artivion
AORT
$2B
| $24K | ﹤0.01% |
886
+678
| +326% | +$18.4K |
|
1468
Arcturus Therapeutics
ARCT
$490M
| $24K | ﹤0.01% |
2,910
+1,460
| +101% | +$12K |
|
1469
TopBuild
BLD
$12B
| $24K | ﹤0.01% |
316
+2
| +0.6% | +$152 |
|
1470
Santander
BSBR
$40.7B
| $24K | ﹤0.01% |
+3,353
| New | +$24K |
|
1471
ZW Data Action Technologies
CNET
$4.44M
| $24K | ﹤0.01% |
491
+321
| +189% | +$15.7K |
|
1472
H.B. Fuller
FUL
$3.44B
| $24K | ﹤0.01% |
460
+359
| +355% | +$18.7K |
|
1473
Hovnanian Enterprises
HOV
$917M
| $24K | ﹤0.01% |
601
-734
| -55% | -$29.3K |
|
1474
Kforce
KFRC
$583M
| $24K | ﹤0.01% |
703
+694
| +7,711% | +$23.7K |
|
1475
Kura Oncology
KURA
$766M
| $24K | ﹤0.01% |
+1,330
| New | +$24K |
|