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
| Rank | Stock | Value |
|---|---|---|
| 1 |
Gilead Sciences
GILD
|
+$33M |
| 2 |
Apple
AAPL
|
+$32.5M |
| 3 |
Booking.com
BKNG
|
+$28.7M |
| 4 |
Amazon
AMZN
|
+$25.7M |
| 5 |
Baidu
BIDU
|
+$16.3M |
Top Sells
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 13.8% |
| 2 | Technology | 11.13% |
| 3 | Healthcare | 8.34% |
| 4 | Energy | 5.42% |
| 5 | Communication Services | 4.79% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
1
Apple
AAPL
$4.81T
| $32.9M | 3.99% |
+1,193,152
| New | +$32.5M |
|
|
2
Gilead Sciences
GILD
$162B
| $30.1M | 3.65% |
+319,426
| New | +$33M |
|
|
3
Booking.com
BKNG
$139B
| $29M | 3.51% |
+635,050
| New | +$28.7M |
|
|
4
Amazon
AMZN
$2.66T
| $25.6M | 3.1% |
+1,650,300
| New | +$25.7M |
|
|
5
Baidu
BIDU
$36.8B
| $16.2M | 1.96% |
+70,928
| New | +$16.3M |
|
6
Chipotle Mexican Grill
CMG
$42.7B
| $14.5M | 1.75% |
+1,058,000
| New | +$13.8M |
|
7
CALL
Tesla
TSLA
$1.42T
| $12.7M | 1.54% |
+55,440
| New | +$866K |
|
8
Micron Technology
MU
$1.1T
| $11.5M | 1.39% |
+327,779
| New | +$10.9M |
|
9
Microsoft
MSFT
$2.95T
| $8.44M | 1.02% |
+181,622
| New | +$8.53M |
|
10
Mastercard
MA
$476B
| $8.27M | 1% |
+96,023
| New | +$7.84M |
|
|
11
CALL
Gilead Sciences
GILD
$162B
| $8.16M | 0.99% |
+6,894
| New | +$713K |
|
|
TWTR
12
DELISTED
Twitter, Inc.
TWTR
| $7.55M | 0.91% |
+210,507
| New | +$8.96M |
|
13
IBM
IBM
$198B
| $6.77M | 0.82% |
+44,162
| New | +$7.03M |
|
14
CALL
American Airlines Group
AAL
$10.1B
| $6.75M | 0.82% |
+7,206
| New | +$310K |
|
15
CALL
Alphabet (Google) Class C
GOOG
$4.22T
| $6.58M | 0.8% |
+102,140
| New | +$2.74M |
|
|
CELG
16
CALL
DELISTED
Celgene Corp
CELG
| $6.12M | 0.74% |
+3,469
| New | +$366K |
|
17
PUT
GoPro
GPRO
$125M
| $6.04M | 0.73% |
+5,282
| New | +$389K |
|
|
18
PUT
Alphabet (Google) Class C
GOOG
$4.22T
| $5.52M | 0.67% |
+71,736
| New | +$1.92M |
|
19
PUT
State Street SPDR NYSE Technology ETF
XNTK
$2.16B
| $5.26M | 0.64% |
+20,720
| New | +$1.01M |
|
20
PUT
Netflix
NFLX
$286B
| $4.56M | 0.55% |
+110,880
| New | +$595K |
|
|
VXX
21
CALL
DELISTED
iPath S&P 500 VIX Short-Term Futures ETN due 1/30/2019
VXX
| $4.44M | 0.54% |
+429
| New | +$211K |
|
|
22
CALL
Booking.com
BKNG
$139B
| $4.36M | 0.53% |
+35,350
| New | +$1.6M |
|
|
23
PUT
Gilead Sciences
GILD
$162B
| $4.04M | 0.49% |
+7,844
| New | +$811K |
|
|
YHOO
24
DELISTED
Yahoo Inc
YHOO
| $4M | 0.49% |
+79,298
| New | +$3.73M |
|
25
WisdomTree Japan Hedged Equity Fund
DXJ
$7.21B
| $4M | 0.48% |
+81,285
| New | +$4.24M |
|
Similar funds
Simplex Trading's Q4 2014 Portfolio in Review
Q4 2014 is the first quarter with a 13F filing on record for Simplex Trading, which disclosed 4,682 positions worth $826M. Its ten largest holdings account for 23% of the portfolio.
Its largest position is Gilead Sciences: 319,426 shares worth $30.1M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 14% of assets, followed by Technology and Healthcare.
- Simplex Trading's largest Q4 2014 buy was Gilead Sciences: 319,426 shares worth $30.1M.
- Simplex Trading's ten largest holdings make up 23% of its $826M portfolio in Q4 2014.
- Simplex Trading disclosed 4,682 positions in Q4 2014, its first 13F filing on record.
Based on Simplex Trading's 13F filing for Q4 2014, filed 4 Mar 2015.