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 | |
|---|---|---|---|---|---|---|
|
LNKD
76
CALL
DELISTED
LinkedIn Corporation
LNKD
| $1.92M | 0.23% |
+893
| New | +$194K |
|
77
PUT
iShares MSCI Australia ETF
EWA
$1.34B
| $1.89M | 0.23% |
+8,683
| New | +$207K |
|
|
TWTR
78
PUT
DELISTED
Twitter, Inc.
TWTR
| $1.89M | 0.23% |
+3,332
| New | +$142K |
|
79
Capri Holdings
CPRI
$1.83B
| $1.89M | 0.23% |
+25,095
| New | +$1.87M |
|
80
PUT
Herbalife
HLF
$1.27B
| $1.85M | 0.22% |
+5,354
| New | +$115K |
|
81
CALL
GoPro
GPRO
$125M
| $1.82M | 0.22% |
+4,084
| New | +$301K |
|
|
PXD
82
PUT
DELISTED
Pioneer Natural Resource Co.
PXD
| $1.75M | 0.21% |
+456
| New | +$75.3K |
|
|
CBST
83
DELISTED
CUBIST PHARMACEUTICALS INC
CBST
| $1.74M | 0.21% |
+17,324
| New | +$1.35M |
|
84
Boeing
BA
$161B
| $1.68M | 0.2% |
+12,900
| New | +$1.64M |
|
85
Costco
COST
$412B
| $1.64M | 0.2% |
+11,589
| New | +$1.58M |
|
|
X
86
PUT
DELISTED
US Steel
X
| $1.62M | 0.2% |
+2,113
| New | +$70.5K |
|
87
CALL
iShares S&P 100 ETF
OEF
$20.2B
| $1.61M | 0.2% |
+586
| New | +$52.4K |
|
88
Blackstone
BX
$152B
| $1.61M | 0.19% |
+48,365
| New | +$1.51M |
|
|
EMC
89
DELISTED
EMC CORPORATION
EMC
| $1.53M | 0.19% |
+51,576
| New | +$1.5M |
|
|
SDRL
90
PUT
DELISTED
Seadrill Limited Common Stock
SDRL
| $1.52M | 0.18% |
+6
| New | +$30.1K |
|
91
Qualcomm
QCOM
$183B
| $1.51M | 0.18% |
+20,384
| New | +$1.49M |
|
|
MNDT
92
DELISTED
Mandiant, Inc. Common Stock
MNDT
| $1.51M | 0.18% |
+47,775
| New | +$1.47M |
|
93
Vanguard Real Estate ETF
VNQ
$39.4B
| $1.47M | 0.18% |
+18,111
| New | +$1.42M |
|
|
DISH
94
DELISTED
DISH Network Corp.
DISH
| $1.46M | 0.18% |
+20,023
| New | +$1.35M |
|
95
Ross Stores
ROST
$75.6B
| $1.44M | 0.17% |
+30,536
| New | +$1.29M |
|
96
Yum! Brands
YUM
$40.6B
| $1.42M | 0.17% |
+27,148
| New | +$1.41M |
|
97
Stratasys
SSYS
$701M
| $1.42M | 0.17% |
+17,102
| New | +$1.75M |
|
98
CALL
Delta Air Lines
DAL
$55.7B
| $1.36M | 0.17% |
+2,107
| New | +$88.7K |
|
|
SUNE
99
DELISTED
SUNEDISON, INC COM
SUNE
| $1.34M | 0.16% |
+68,931
| New | +$1.31M |
|
100
PUT
IBM
IBM
$198B
| $1.34M | 0.16% |
+2,207
| New | +$351K |
|
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.