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 | |
|---|---|---|---|---|---|---|
|
1
Amazon
AMZN
$2.44T
| $45M | 0.18% | 26,472 -19,665 | -43% | -$33.4M |
|
|
2
Micron Technology
MU
$133B
| $45M | 0.18% | 857,462 +627,573 | +273% | +$32.9M |
|
|
3
Apple
AAPL
$3.45T
| $44.4M | 0.17% | 239,925 +190,181 | +382% | +$35.2M |
|
|
4
Berkshire Hathaway Class B
BRK.B
$1.09T
| $43.2M | 0.17% | 231,691 +158,231 | +215% | +$29.5M |
|
|
5
SPDR Dow Jones Industrial Average ETF Trust
DIA
$39.9B
| $42.2M | 0.17% | 173,733 +90,620 | +109% | +$22M |
|
|
6
Netflix
NFLX
$513B
| $35.1M | 0.14% | 89,753 -45,343 | -34% | -$17.7M |
|
7
Boeing
BA
$177B
| $25M | 0.1% | 74,606 +62,446 | +514% | +$21M |
|
|
8
NVIDIA
NVDA
$4.24T
| $24.9M | 0.1% | 105,043 +96,702 | +1,159% | +$22.9M |
|
9
Adobe
ADBE
$151B
| $21M | 0.08% | 86,165 +41,406 | +93% | +$10.1M |
|
|
TFCFA
10
DELISTED
Twenty-First Century Fox, Inc. Class A
TFCFA
| $21M | 0.08% | 421,923 +415,218 | +6,193% | +$20.6M |
|
11
Caterpillar
CAT
$196B
| $19.7M | 0.08% | 145,200 +84,482 | +139% | +$11.5M |
|
12
Alphabet (Google) Class A
GOOGL
$2.57T
| $18M | 0.07% | 15,917 -1,931 | -11% | -$2.18M |
|
|
13
Alphabet (Google) Class C
GOOG
$2.58T
| $16.3M | 0.06% | +14,593 | New | +$16.3M |
|
14
Meta Platforms (Facebook)
META
$1.86T
| $15.7M | 0.06% | 80,705 -17,166 | -18% | -$3.34M |
|
15
Alibaba
BABA
$322B
| $15.3M | 0.06% | 82,609 +1,840 | +2% | +$341K |
|
16
IBM
IBM
$227B
| $15.3M | 0.06% | 109,350 +65,396 | +149% | +$9.14M |
|
|
17
Tesla
TSLA
$1.08T
| $15.1M | 0.06% | 44,075 -57,594 | -57% | -$19.8M |
|
18
Morgan Stanley
MS
$240B
| $14M | 0.06% | 295,989 +246,653 | +500% | +$11.7M |
|
19
Exxon Mobil
XOM
$487B
| $13.4M | 0.05% | 161,921 +98,154 | +154% | +$8.12M |
|
20
McDonald's
MCD
$224B
| $12.2M | 0.05% | 77,996 +36,234 | +87% | +$5.68M |
|
21
Deere & Co
DE
$129B
| $12.2M | 0.05% | 87,301 +67,914 | +350% | +$9.49M |
|
22
SPDR Gold Trust
GLD
$107B
| $11.8M | 0.05% | +99,473 | New | +$11.8M |
|
23
Baidu
BIDU
$32.8B
| $11.3M | 0.04% | 46,438 +12,487 | +37% | +$3.03M |
|
|
XYZ
24
Block, Inc.
XYZ
$48.5B
| $11.1M | 0.04% | 179,662 +167,325 | +1,356% | +$10.3M |
|
25
Applied Materials
AMAT
$128B
| $10.6M | 0.04% | +230,449 | New | +$10.6M |
|