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
|
$41.4M |
| 2 |
Berkshire Hathaway Class B
BRK.B
|
$12.3M |
| 3 |
SPDR S&P 500 ETF Trust
SPY
|
$9.89M |
| 4 |
Alibaba
BABA
|
$9.66M |
| 5 |
Intel
INTC
|
$9.11M |
Top Sells
| 1 |
Apple
AAPL
|
$36.8M |
| 2 |
Gilead Sciences
GILD
|
$31.2M |
| 3 |
Booking.com
BKNG
|
$29M |
| 4 |
Amazon
AMZN
|
$25.6M |
| 5 |
Baidu
BIDU
|
$12.9M |
Sector Composition
| 1 | Communication Services | 13.31% |
| 2 | Consumer Discretionary | 13.07% |
| 3 | Healthcare | 12.41% |
| 4 | Technology | 11.91% |
| 5 | Financials | 8.28% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
|
1
Alphabet (Google) Class C
GOOG
$2.58T
| $41.4M | 4.81% | +74,674 | New | +$41.4M |
|
|
2
Berkshire Hathaway Class B
BRK.B
$1.09T
| $12.3M | 1.43% | +85,180 | New | +$12.3M |
|
|
3
Alibaba
BABA
$322B
| $9.92M | 1.15% | 119,193 +116,013 | +3,648% | +$9.66M |
|
|
4
SPDR S&P 500 ETF Trust
SPY
$658B
| $9.89M | 1.15% | +47,905 | New | +$9.89M |
|
|
5
Intel
INTC
$107B
| $9.11M | 1.06% | +291,383 | New | +$9.11M |
|
6
McDonald's
MCD
$224B
| $8.52M | 0.99% | +87,434 | New | +$8.52M |
|
7
Goldman Sachs
GS
$226B
| $7.25M | 0.84% | 38,591 +19,040 | +97% | +$3.58M |
|
8
Walmart
WMT
$774B
| $6.48M | 0.75% | +78,814 | New | +$6.48M |
|
9
Procter & Gamble
PG
$368B
| $5.95M | 0.69% | +72,651 | New | +$5.95M |
|
|
CTRX
10
DELISTED
CATAMARAN CORP COM STK (CDA)
CTRX
| $5.5M | 0.64% | 92,291 +91,329 | +9,494% | +$5.44M |
|
11
Ralph Lauren
RL
$18B
| $5.22M | 0.61% | 39,679 +37,116 | +1,448% | +$4.88M |
|
12
Micron Technology
MU
$133B
| $4.75M | 0.55% | 174,992 -152,787 | -47% | -$4.14M |
|
|
CELG
13
DELISTED
Celgene Corp
CELG
| $4.75M | 0.55% | 41,185 +15,114 | +58% | +$1.74M |
|
|
WBA
14
DELISTED
Walgreens Boots Alliance
WBA
| $4.67M | 0.54% | 55,207 +45,853 | +490% | +$3.88M |
|
|
APC
15
DELISTED
Anadarko Petroleum
APC
| $4.08M | 0.47% | +49,250 | New | +$4.08M |
|
|
TRW
16
DELISTED
TRW AUTOMOTIVE HOLDINGS CORP
TRW
| $3.75M | 0.44% | 35,777 +1,249 | +4% | +$131K |
|
17
Skyworks Solutions
SWKS
$11.1B
| $3.75M | 0.44% | 38,154 +2,623 | +7% | +$258K |
|
18
SPDR S&P MidCap 400 ETF Trust
MDY
$23.7B
| $3.7M | 0.43% | +13,341 | New | +$3.7M |
|
19
AbbVie
ABBV
$372B
| $3.69M | 0.43% | +63,011 | New | +$3.69M |
|
20
Illumina
ILMN
$15.8B
| $3.58M | 0.42% | 19,269 +8,255 | +75% | +$1.53M |
|
21
Chipotle Mexican Grill
CMG
$56.5B
| $3.46M | 0.4% | 5,326 -15,834 | -75% | -$10.3M |
|
22
Schlumberger
SLB
$55B
| $3.37M | 0.39% | +40,409 | New | +$3.37M |
|
23
Qualcomm
QCOM
$173B
| $3.34M | 0.39% | 48,185 +27,801 | +136% | +$1.93M |
|
24
Netflix
NFLX
$513B
| $3.17M | 0.37% | 7,603 +7,333 | +2,716% | +$3.06M |
|
|
LNKD
25
DELISTED
LinkedIn Corporation
LNKD
| $3.16M | 0.37% | +12,655 | New | +$3.16M |
|