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
|
$80M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
$45.3M |
| 3 |
Alphabet (Google) Class C
GOOG
|
$38.8M |
| 4 |
Amazon
AMZN
|
$38.6M |
| 5 |
Tesla
TSLA
|
$36M |
Top Sells
| 1 |
Alibaba
BABA
|
$46.4M |
| 2 |
Boeing
BA
|
$29.8M |
| 3 |
SPDR Gold Trust
GLD
|
$18.2M |
| 4 |
Biogen
BIIB
|
$15.8M |
| 5 |
NVIDIA
NVDA
|
$14.3M |
Sector Composition
| 1 | Technology | 22.73% |
| 2 | Consumer Discretionary | 17.54% |
| 3 | Communication Services | 10.03% |
| 4 | Healthcare | 9.29% |
| 5 | Industrials | 5.63% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
426
Dave & Buster's
PLAY
$820M
| $550K | ﹤0.01% |
13,701
+8,675
| +173% | +$348K |
|
|
AVYA
427
DELISTED
Avaya Holdings Corp. Common Stock
AVYA
| $550K | ﹤0.01% |
40,775
-31,977
| -44% | -$431K |
|
|
CPE
428
DELISTED
Callon Petroleum Company
CPE
| $549K | ﹤0.01% |
11,381
+11,016
| +3,018% | +$531K |
|
429
Invesco Senior Loan ETF
BKLN
$6.98B
| $546K | ﹤0.01% |
+23,951
| New | +$546K |
|
|
MLNX
430
DELISTED
Mellanox Technologies, Ltd.
MLNX
| $546K | ﹤0.01% |
4,667
+4,567
| +4,567% | +$534K |
|
431
Ultragenyx Pharmaceutical
RARE
$3.07B
| $545K | ﹤0.01% |
12,772
+1,659
| +15% | +$70.8K |
|
432
Harmony Gold Mining
HMY
$8.78B
| $544K | ﹤0.01% |
150,061
-7,756
| -5% | -$28.1K |
|
433
Marvell Technology
MRVL
$54.6B
| $544K | ﹤0.01% |
20,483
+1,849
| +10% | +$49.1K |
|
434
Natera
NTRA
$23.1B
| $544K | ﹤0.01% |
16,157
+13,898
| +615% | +$468K |
|
|
LCI
435
DELISTED
Lannett Company, Inc.
LCI
| $544K | ﹤0.01% |
+15,438
| New | +$544K |
|
436
Knight Transportation
KNX
$7B
| $542K | ﹤0.01% |
+15,146
| New | +$542K |
|
437
Penumbra
PEN
$11B
| $542K | ﹤0.01% |
3,303
-4,080
| -55% | -$670K |
|
438
Brown-Forman Class B
BF.B
$13.7B
| $538K | ﹤0.01% |
7,962
+6,133
| +335% | +$414K |
|
439
Radware
RDWR
$1.07B
| $537K | ﹤0.01% |
20,831
-18,105
| -46% | -$467K |
|
|
LTHM
440
DELISTED
Livent Corporation
LTHM
| $536K | ﹤0.01% |
62,741
+56,029
| +835% | +$479K |
|
441
Domo
DOMO
$603M
| $533K | ﹤0.01% |
+24,583
| New | +$533K |
|
442
Kinross Gold
KGC
$26.9B
| $532K | ﹤0.01% |
112,257
+92,640
| +472% | +$439K |
|
443
Masco
MAS
$15.9B
| $532K | ﹤0.01% |
11,105
-27,084
| -71% | -$1.3M |
|
|
PDCE
444
DELISTED
PDC Energy, Inc.
PDCE
| $532K | ﹤0.01% |
20,363
+19,123
| +1,542% | +$500K |
|
445
iShares MSCI Spain ETF
EWP
$1.36B
| $530K | ﹤0.01% |
18,341
+11,655
| +174% | +$337K |
|
446
Tactile Systems Technology
TCMD
$300M
| $530K | ﹤0.01% |
+7,851
| New | +$530K |
|
|
NUAN
447
DELISTED
Nuance Communications, Inc.
NUAN
| $530K | ﹤0.01% |
29,760
+24,708
| +489% | +$440K |
|
448
QuidelOrtho
QDEL
$1.95B
| $526K | ﹤0.01% |
7,014
-7,637
| -52% | -$573K |
|
449
CBRE Group
CBRE
$48.9B
| $524K | ﹤0.01% |
+8,559
| New | +$524K |
|
450
Eversource Energy
ES
$23.6B
| $522K | ﹤0.01% |
+6,145
| New | +$522K |
|