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 |
Alphabet (Google) Class C
GOOG
|
$54.6M |
| 2 |
iShares Russell 2000 ETF
IWM
|
$52.5M |
| 3 |
SPDR S&P 500 ETF Trust
SPY
|
$40.9M |
| 4 |
Apple
AAPL
|
$16.5M |
| 5 |
Visa
V
|
$12M |
Top Sells
| 1 |
Amazon
AMZN
|
$98.7M |
| 2 |
Meta Platforms (Facebook)
META
|
$70.7M |
| 3 |
Invesco QQQ Trust
QQQ
|
$33.4M |
| 4 |
Goldman Sachs
GS
|
$30.2M |
| 5 |
Boeing
BA
|
$26.5M |
Sector Composition
| 1 | Communication Services | 14.71% |
| 2 | Consumer Discretionary | 14.32% |
| 3 | Technology | 11.86% |
| 4 | Financials | 7.38% |
| 5 | Industrials | 6.44% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
|
1
Alphabet (Google) Class C
GOOG
$2.58T
| $82.3M | 0.24% | 79,457 +52,770 | +198% | +$54.6M |
|
|
2
iShares Russell 2000 ETF
IWM
$67B
| $69.5M | 0.2% | 519,225 +391,973 | +308% | +$52.5M |
|
|
3
Amazon
AMZN
$2.44T
| $59.6M | 0.17% | 39,659 -65,710 | -62% | -$98.7M |
|
|
4
SPDR S&P 500 ETF Trust
SPY
$658B
| $40.9M | 0.12% | +163,699 | New | +$40.9M |
|
5
Netflix
NFLX
$513B
| $26M | 0.08% | 97,163 -2,561 | -3% | -$685K |
|
|
6
Invesco QQQ Trust
QQQ
$364B
| $24M | 0.07% | 155,534 -216,272 | -58% | -$33.4M |
|
|
7
Apple
AAPL
$3.45T
| $19.6M | 0.06% | 124,132 +104,860 | +544% | +$16.5M |
|
8
Financial Select Sector SPDR Fund
XLF
$54.1B
| $18.2M | 0.05% | 762,502 +486,634 | +176% | +$11.6M |
|
|
XYZ
9
Block, Inc.
XYZ
$48.5B
| $14.1M | 0.04% | 250,964 +28,385 | +13% | +$1.59M |
|
|
10
Visa
V
$683B
| $12M | 0.04% | +91,061 | New | +$12M |
|
11
SPDR S&P Oil & Gas Exploration & Production ETF
XOP
$1.9B
| $10.5M | 0.03% | 395,956 +364,867 | +1,174% | +$9.68M |
|
12
Wynn Resorts
WYNN
$13.2B
| $9.6M | 0.03% | 97,069 +52,398 | +117% | +$5.18M |
|
13
VanEck Semiconductor ETF
SMH
$27B
| $8.45M | 0.02% | 96,819 +65,159 | +206% | +$5.69M |
|
14
NVIDIA
NVDA
$4.24T
| $8.38M | 0.02% | 62,783 -51,707 | -45% | -$6.9M |
|
15
Electronic Arts
EA
$43B
| $8.3M | 0.02% | 105,132 +67,026 | +176% | +$5.29M |
|
16
Schlumberger
SLB
$55B
| $7.96M | 0.02% | 220,580 +54,683 | +33% | +$1.97M |
|
17
Roku
ROKU
$14.2B
| $7.51M | 0.02% | 245,080 +26,183 | +12% | +$802K |
|
18
Invesco CurrencyShares Euro Currency Trust
FXE
$529M
| $7.11M | 0.02% | 64,911 +31,038 | +92% | +$3.4M |
|
|
RDS.A
19
DELISTED
Royal Dutch Shell PLC ADS Class A
RDS.A
| $6.94M | 0.02% | 119,172 +86,165 | +261% | +$5.02M |
|
20
Delta Air Lines
DAL
$40.3B
| $6.64M | 0.02% | 132,989 +77,535 | +140% | +$3.87M |
|
|
TFCFA
21
DELISTED
Twenty-First Century Fox, Inc. Class A
TFCFA
| $6.44M | 0.02% | +133,770 | New | +$6.44M |
|
22
iShares MSCI Brazil ETF
EWZ
$5.45B
| $6.25M | 0.02% | +163,714 | New | +$6.25M |
|
23
iShares Russell 2000 Growth ETF
IWO
$12.4B
| $6.19M | 0.02% | 36,828 +31,401 | +579% | +$5.28M |
|
24
GE Aerospace
GE
$292B
| $6.06M | 0.02% | 800,474 +476,437 | +147% | +$3.61M |
|
25
Consumers Staples Select Sector SPDR Fund
XLP
$15.8B
| $5.97M | 0.02% | 117,621 +39,383 | +50% | +$2M |
|