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 | |
|---|---|---|---|---|---|---|
26
CALL
Micron Technology
MU
$1.1T
| $3.83M | 0.46% |
+4,487
| New | +$149K |
|
27
Goldman Sachs
GS
$320B
| $3.79M | 0.46% |
+19,551
| New | +$3.67M |
|
28
PUT
Tesla
TSLA
$1.42T
| $3.6M | 0.44% |
+69,030
| New | +$1.08M |
|
29
Meta Platforms (Facebook)
META
$1.63T
| $3.58M | 0.43% |
+45,819
| New | +$3.5M |
|
|
TRW
30
DELISTED
TRW AUTOMOTIVE HOLDINGS CORP
TRW
| $3.55M | 0.43% |
+34,528
| New | +$3.53M |
|
|
AGN
31
DELISTED
Allergan plc
AGN
| $3.53M | 0.43% |
+13,717
| New | +$3.43M |
|
32
Las Vegas Sands
LVS
$30.1B
| $3.49M | 0.42% |
+60,051
| New | +$3.62M |
|
33
Devon Energy
DVN
$50.9B
| $3.48M | 0.42% |
+56,880
| New | +$3.45M |
|
|
YHOO
34
CALL
DELISTED
Yahoo Inc
YHOO
| $3.48M | 0.42% |
+4,502
| New | +$212K |
|
35
Delta Air Lines
DAL
$55.7B
| $3.38M | 0.41% |
+68,778
| New | +$2.89M |
|
36
Coca-Cola
KO
$353B
| $3.21M | 0.39% |
+76,030
| New | +$3.25M |
|
37
Dollar General
DG
$27.2B
| $3.18M | 0.39% |
+44,960
| New | +$2.93M |
|
38
CALL
Alibaba
BABA
$283B
| $3.16M | 0.38% |
+8,133
| New | +$835K |
|
|
39
PUT
Booking.com
BKNG
$139B
| $3.13M | 0.38% |
+37,700
| New | +$1.7M |
|
|
40
PUT
Alibaba
BABA
$283B
| $2.99M | 0.36% |
+4,325
| New | +$444K |
|
41
TripAdvisor
TRIP
$1.61B
| $2.96M | 0.36% |
+39,665
| New | +$3.1M |
|
|
CELG
42
DELISTED
Celgene Corp
CELG
| $2.92M | 0.35% |
+26,071
| New | +$2.75M |
|
43
CALL
Mastercard
MA
$476B
| $2.74M | 0.33% |
+1,823
| New | +$149K |
|
44
CALL
Regeneron Pharmaceuticals
REGN
$70.8B
| $2.73M | 0.33% |
+549
| New | +$216K |
|
|
VMW
45
DELISTED
VMware, Inc
VMW
| $2.7M | 0.33% |
+32,709
| New | +$2.79M |
|
46
PUT
VanEck Gold Miners ETF
GDX
$22.7B
| $2.69M | 0.33% |
+6,003
| New | +$116K |
|
47
Kinder Morgan
KMI
$72B
| $2.6M | 0.31% |
+61,402
| New | +$2.42M |
|
48
Skyworks Solutions
SWKS
$9.47B
| $2.58M | 0.31% |
+35,531
| New | +$2.2M |
|
|
49
CALL
Meta Platforms (Facebook)
META
$1.63T
| $2.58M | 0.31% |
+4,351
| New | +$333K |
|
50
CALL
Biogen
BIIB
$30B
| $2.57M | 0.31% |
+929
| New | +$301K |
|
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.