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 | |
|---|---|---|---|---|---|---|
701
CoreCivic
CXW
$3.13B
| $148K | 0.02% |
+4,086
| New | +$147K |
|
702
Dick's Sporting Goods
DKS
$18.3B
| $148K | 0.02% |
+2,990
| New | +$140K |
|
|
GDP
703
PUT
DELISTED
GOODRICH PETROLEUM CORP(NEW)
GDP
| $148K | 0.02% |
+103
| New | +$802 |
|
704
CALL
Danaher
DHR
$135B
| $147K | 0.02% |
+150
| New | +$8.14K |
|
705
PUT
Capri Holdings
CPRI
$1.78B
| $145K | 0.02% |
+454
| New | +$33.8K |
|
706
Lear
LEA
$7.14B
| $145K | 0.02% |
+1,479
| New | +$136K |
|
707
Microchip Technology
MCHP
$44.2B
| $145K | 0.02% |
+6,446
| New | +$140K |
|
|
XONE
708
DELISTED
The ExOne Company
XONE
| $145K | 0.02% |
+8,604
| New | +$173K |
|
|
STJ
709
CALL
DELISTED
St Jude Medical
STJ
| $144K | 0.02% |
+271
| New | +$17.5K |
|
710
CALL
Agilent Technologies
A
$39.5B
| $143K | 0.02% |
+690
| New | +$27.8K |
|
711
Sprouts Farmers Market
SFM
$6.91B
| $143K | 0.02% |
+4,219
| New | +$129K |
|
712
CALL
Sherwin-Williams
SHW
$76.6B
| $143K | 0.02% |
+132
| New | +$10.4K |
|
|
RCPT
713
CALL
DELISTED
RECEPTOS INC COM STK (DE)
RCPT
| $143K | 0.02% |
+49
| New | +$4.96K |
|
714
PUT
FedEx
FDX
$74.7B
| $142K | 0.02% |
+483
| New | +$81.7K |
|
|
CEO
715
PUT
DELISTED
CNOOC Limited
CEO
| $142K | 0.02% |
+69
| New | +$10.3K |
|
716
PUT
GSK
GSK
$102B
| $141K | 0.02% |
+227
| New | +$12.7K |
|
717
CALL
Neurocrine Biosciences
NBIX
$17.5B
| $141K | 0.02% |
+285
| New | +$5.4K |
|
718
SM Energy
SM
$8.03B
| $141K | 0.02% |
+3,657
| New | +$183K |
|
719
AGCO
AGCO
$8.49B
| $140K | 0.02% |
+3,101
| New | +$137K |
|
720
PUT
Intuitive Surgical
ISRG
$119B
| $140K | 0.02% |
+1,593
| New | +$88.7K |
|
721
CALL
Microsoft
MSFT
$2.83T
| $140K | 0.02% |
+1,308
| New | +$61.4K |
|
|
AET
722
DELISTED
Aetna Inc
AET
| $140K | 0.02% |
+1,580
| New | +$133K |
|
723
PUT
Synaptics
SYNA
$4.59B
| $139K | 0.02% |
+187
| New | +$12.5K |
|
724
TG Therapeutics
TGTX
$8.5B
| $139K | 0.02% |
+8,776
| New | +$114K |
|
725
PUT
VirnetX Holding Corp
VHC
$52.1M
| $139K | 0.02% |
+8
| New | +$829 |
|
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.