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 |
Goldman Sachs
GS
|
+$38.4M |
| 2 |
Micron Technology
MU
|
+$23.7M |
| 3 |
NVIDIA
NVDA
|
+$23.6M |
| 4 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$21.7M |
| 5 |
Wells Fargo
WFC
|
+$20.4M |
Top Sells
| 1 |
Citigroup
C
|
+$21.6M |
| 2 |
Apple
AAPL
|
+$17.2M |
| 3 |
Invesco QQQ Trust
QQQ
|
+$13.3M |
| 4 |
Eli Lilly
LLY
|
+$9.69M |
| 5 |
Mastercard
MA
|
+$8.27M |
Sector Composition
| 1 | Technology | 14.2% |
| 2 | Communication Services | 13.46% |
| 3 | Consumer Discretionary | 12.76% |
| 4 | Healthcare | 12.43% |
| 5 | Financials | 10.75% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
426
IQVIA
IQV
$32.3B
| $534K | 0.02% |
6,634
+4,663
| +237% | +$375K |
|
|
SIOX
427
DELISTED
Sio Gene Therapies Inc. Common Stock
SIOX
| $531K | 0.02% |
4,443
+2,274
| +105% | +$272K |
|
428
ON Semiconductor
ON
$21.2B
| $530K | 0.02% |
34,217
-9,781
| -22% | -$152K |
|
429
Zebra Technologies
ZBRA
$16.4B
| $529K | 0.02% |
+5,806
| New | +$529K |
|
430
Shutterstock
SSTK
$775M
| $528K | 0.02% |
+12,789
| New | +$528K |
|
|
IPXL
431
DELISTED
Impax Laboratories, Inc.
IPXL
| $528K | 0.02% |
41,750
+35,529
| +571% | +$449K |
|
|
DBVT
432
DBV Technologies
DBVT
$262M
| $526K | 0.02% |
+1,495
| New | +$526K |
|
433
Masco
MAS
$15.3B
| $521K | 0.02% |
15,352
+9,769
| +175% | +$332K |
|
434
Ambac
AMBC
$423M
| $519K | 0.02% |
27,543
-9,027
| -25% | -$170K |
|
435
Trinity Industries
TRN
$2.31B
| $519K | 0.02% |
27,176
-19,294
| -42% | -$368K |
|
436
Post Holdings
POST
$5.64B
| $510K | 0.02% |
8,908
-466
| -5% | -$26.7K |
|
437
Boston Scientific
BSX
$146B
| $506K | 0.02% |
20,384
-139,419
| -87% | -$3.46M |
|
|
SN
438
DELISTED
Sanchez Energy Corporation
SN
| $505K | 0.02% |
52,978
+47,910
| +945% | +$457K |
|
|
BSFT
439
DELISTED
BroadSoft, Inc.
BSFT
| $505K | 0.02% |
12,569
+12,548
| +59,752% | +$504K |
|
|
SWC
440
DELISTED
Stillwater Mining Co
SWC
| $505K | 0.02% |
29,255
+20,574
| +237% | +$355K |
|
|
KANG
441
DELISTED
iKang Healthcare Group, Inc.
KANG
| $500K | 0.02% |
34,301
-141,317
| -80% | -$2.06M |
|
442
Comstock Resources
CRK
$5B
| $499K | 0.02% |
54,084
+37,686
| +230% | +$348K |
|
|
CS
443
DELISTED
Credit Suisse Group
CS
| $498K | 0.02% |
33,568
+32,322
| +2,594% | +$480K |
|
|
CALA
444
DELISTED
Calithera Biosciences, Inc
CALA
| $498K | 0.02% |
2,158
+1,960
| +990% | +$452K |
|
|
BWLD
445
DELISTED
Buffalo Wild Wings, Inc.
BWLD
| $495K | 0.02% |
+3,243
| New | +$495K |
|
|
WPX
446
DELISTED
WPX Energy, Inc.
WPX
| $493K | 0.02% |
+36,876
| New | +$493K |
|
447
Apogee Enterprises
APOG
$917M
| $489K | 0.02% |
+8,212
| New | +$489K |
|
448
Lexicon Pharmaceuticals
LXRX
$443M
| $489K | 0.02% |
34,131
+27,104
| +386% | +$388K |
|
449
Suncor Energy
SU
$51.8B
| $489K | 0.02% |
+15,918
| New | +$489K |
|
450
Zillow
Z
$21.8B
| $489K | 0.02% |
+14,524
| New | +$489K |
|