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 | |
|---|---|---|---|---|---|---|
|
1
Amazon
AMZN
$2.44T
| $66.8M | 2.94% | 46,137 -49,684 | -52% | -$71.9M |
|
|
2
Netflix
NFLX
$513B
| $39.9M | 1.75% | 135,096 +83,625 | +162% | +$24.7M |
|
|
TWX
3
DELISTED
Time Warner Inc
TWX
| $34.8M | 1.53% | 367,986 +193,736 | +111% | +$18.3M |
|
|
4
Tesla
TSLA
$1.08T
| $27.1M | 1.19% | +101,669 | New | +$27.1M |
|
|
5
SPDR Dow Jones Industrial Average ETF Trust
DIA
$39.9B
| $20.1M | 0.88% | +83,113 | New | +$20.1M |
|
|
6
Alphabet (Google) Class A
GOOGL
$2.57T
| $18.5M | 0.81% | 17,848 -7,270 | -29% | -$7.54M |
|
7
Meta Platforms (Facebook)
META
$1.86T
| $15.6M | 0.69% | 97,871 +52,860 | +117% | +$8.45M |
|
8
Mastercard
MA
$538B
| $15.5M | 0.68% | 88,617 +5,418 | +7% | +$949K |
|
|
9
Alibaba
BABA
$322B
| $14.8M | 0.65% | 80,769 +80,616 | +52,690% | +$14.8M |
|
10
Berkshire Hathaway Class B
BRK.B
$1.09T
| $14.7M | 0.64% | 73,460 +8,821 | +14% | +$1.76M |
|
|
11
Micron Technology
MU
$133B
| $12M | 0.53% | 229,889 -914,544 | -80% | -$47.7M |
|
12
Qualcomm
QCOM
$173B
| $11.6M | 0.51% | 209,004 +187,363 | +866% | +$10.4M |
|
13
Schlumberger
SLB
$55B
| $10.9M | 0.48% | 168,323 +149,648 | +801% | +$9.69M |
|
14
American International
AIG
$45.1B
| $10.2M | 0.45% | +188,009 | New | +$10.2M |
|
15
Advanced Micro Devices
AMD
$264B
| $10.2M | 0.45% | 1,014,115 +698,706 | +222% | +$7.02M |
|
16
Adobe
ADBE
$151B
| $9.67M | 0.43% | +44,759 | New | +$9.67M |
|
17
JPMorgan Chase
JPM
$829B
| $9.33M | 0.41% | +84,819 | New | +$9.33M |
|
|
TWTR
18
DELISTED
Twitter, Inc.
TWTR
| $9.08M | 0.4% | +313,108 | New | +$9.08M |
|
19
Consumer Discretionary Select Sector SPDR Fund
XLY
$23.2B
| $9.01M | 0.4% | +88,939 | New | +$9.01M |
|
20
Caterpillar
CAT
$196B
| $8.95M | 0.39% | 60,718 +39,002 | +180% | +$5.75M |
|
21
MetLife
MET
$54.1B
| $8.76M | 0.39% | 190,954 +174,159 | +1,037% | +$7.99M |
|
22
Expedia Group
EXPE
$26.6B
| $8.69M | 0.38% | +78,716 | New | +$8.69M |
|
|
CELG
23
DELISTED
Celgene Corp
CELG
| $8.36M | 0.37% | 93,724 -186,470 | -67% | -$16.6M |
|
24
Apple
AAPL
$3.45T
| $8.35M | 0.37% | 49,744 -35,350 | -42% | -$5.93M |
|
25
AT&T
T
$209B
| $8.01M | 0.35% | 224,719 -74,460 | -25% | -$2.65M |
|