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 |
Tesla
TSLA
|
+$27.1M |
| 2 |
Netflix
NFLX
|
+$24.7M |
| 3 |
SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$20.1M |
| 4 |
TWX
Time Warner Inc
TWX
|
+$18.3M |
| 5 |
Alibaba
BABA
|
+$14.8M |
Top Sells
| 1 |
Amazon
AMZN
|
+$71.9M |
| 2 |
Micron Technology
MU
|
+$47.7M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$26.3M |
| 4 |
Boeing
BA
|
+$21M |
| 5 |
Citigroup
C
|
+$19.6M |
Sector Composition
| 1 | Consumer Discretionary | 15.64% |
| 2 | Communication Services | 14.16% |
| 3 | Technology | 12.46% |
| 4 | Financials | 10.94% |
| 5 | Healthcare | 10.33% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
|
RDFN
426
DELISTED
Redfin
RDFN
| $426K | 0.02% |
18,676
+12,121
| +185% | +$276K |
|
427
Carvana
CVNA
$50.6B
| $424K | 0.02% |
18,519
+14,165
| +325% | +$324K |
|
428
ProShares Ultra NASDAQ Biotechnology
BIB
$55.6M
| $423K | 0.02% |
7,688
+5,350
| +229% | +$294K |
|
|
ABB
429
DELISTED
ABB Ltd.
ABB
| $423K | 0.02% |
+17,840
| New | +$423K |
|
|
FMI
430
DELISTED
Foundation Medicine, Inc.
FMI
| $423K | 0.02% |
+5,378
| New | +$423K |
|
431
Aflac
AFL
$56.8B
| $419K | 0.02% |
9,593
-34,091
| -78% | -$1.49M |
|
432
ProShares Short 20+ Year Treasury ETF
TBF
$69.4M
| $415K | 0.02% |
+18,322
| New | +$415K |
|
433
Crown Holdings
CCK
$10.9B
| $414K | 0.02% |
8,176
+2,886
| +55% | +$146K |
|
|
TGI
434
DELISTED
Triumph Group
TGI
| $414K | 0.02% |
+16,464
| New | +$414K |
|
435
Novanta
NOVT
$4.12B
| $412K | 0.02% |
7,914
+1,475
| +23% | +$76.8K |
|
|
CLDT
436
Chatham Lodging
CLDT
$347M
| $411K | 0.02% |
+21,497
| New | +$411K |
|
437
Boston Beer
SAM
$2.37B
| $406K | 0.02% |
2,150
-1,540
| -42% | -$291K |
|
|
ATSG
438
DELISTED
Air Transport Services Group, Inc.
ATSG
| $406K | 0.02% |
17,440
+5,442
| +45% | +$127K |
|
|
ONCE
439
DELISTED
Spark Therapeutics, Inc. Common Stock
ONCE
| $406K | 0.02% |
6,106
-10,490
| -63% | -$698K |
|
440
Deutsche Bank
DB
$69.7B
| $405K | 0.02% |
28,985
-84,419
| -74% | -$1.18M |
|
441
Lockheed Martin
LMT
$108B
| $405K | 0.02% |
1,200
-23,819
| -95% | -$8.04M |
|
442
American Coastal Insurance
ACIC
$530M
| $404K | 0.02% |
21,129
+5,202
| +33% | +$99.5K |
|
443
BlackLine
BL
$3.38B
| $404K | 0.02% |
+10,312
| New | +$404K |
|
|
TGH
444
DELISTED
Textainer Group Holdings limited
TGH
| $401K | 0.02% |
23,662
+13,850
| +141% | +$235K |
|
445
VeriSign
VRSN
$26.6B
| $397K | 0.02% |
+3,356
| New | +$397K |
|
446
Brixmor Property Group
BRX
$8.53B
| $396K | 0.02% |
25,981
+22,067
| +564% | +$336K |
|
447
Yum China
YUMC
$16.2B
| $396K | 0.02% |
+9,545
| New | +$396K |
|
|
RDUS
448
DELISTED
Radius Health, Inc.
RDUS
| $394K | 0.02% |
+10,975
| New | +$394K |
|
449
Philips
PHG
$27B
| $393K | 0.02% |
13,048
+3,411
| +35% | +$103K |
|
450
NETSCOUT
NTCT
$1.81B
| $392K | 0.02% |
14,887
+13,320
| +850% | +$351K |
|