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 | |
|---|---|---|---|---|---|---|
|
SRCI
501
DELISTED
SRC Energy Inc
SRCI
| $237K | 0.03% |
+18,871
| New | +$214K |
|
502
Neurocrine Biosciences
NBIX
$17.5B
| $236K | 0.03% |
+10,573
| New | +$200K |
|
503
PUT
Deere & Co
DE
$165B
| $235K | 0.03% |
+923
| New | +$79.7K |
|
504
CALL
Equinix
EQIX
$102B
| $235K | 0.03% |
+77
| New | +$16.6K |
|
505
Raymond James Financial
RJF
$32.4B
| $235K | 0.03% |
+6,152
| New | +$226K |
|
506
Delek US
DK
$3.97B
| $234K | 0.03% |
+8,574
| New | +$259K |
|
507
PUT
AbbVie
ABBV
$454B
| $233K | 0.03% |
+1,597
| New | +$101K |
|
508
Home Depot
HD
$324B
| $233K | 0.03% |
+2,221
| New | +$216K |
|
509
O'Reilly Automotive
ORLY
$71.4B
| $233K | 0.03% |
+18,180
| New | +$213K |
|
510
CALL
Viatris
VTRS
$20.1B
| $233K | 0.03% |
+294
| New | +$15.8K |
|
511
Entergy
ETR
$54B
| $232K | 0.03% |
+5,310
| New | +$220K |
|
512
PUT
iShares S&P 100 ETF
OEF
$19.8B
| $232K | 0.03% |
+905
| New | +$81K |
|
|
PRXL
513
DELISTED
Parexel International Corp
PRXL
| $232K | 0.03% |
+4,167
| New | +$240K |
|
514
Hain Celestial
HAIN
$49.1M
| $231K | 0.03% |
+3,970
| New | +$215K |
|
|
PTRY
515
DELISTED
PANTRY INC (THE)
PTRY
| $230K | 0.03% |
+6,214
| New | +$168K |
|
|
DISH
516
CALL
DELISTED
DISH Network Corp.
DISH
| $230K | 0.03% |
+243
| New | +$16.4K |
|
517
CALL
Costco
COST
$411B
| $229K | 0.03% |
+257
| New | +$34.9K |
|
518
PUT
Herc Holdings
HRI
$5.45B
| $229K | 0.03% |
+433
| New | +$29.3K |
|
519
NetEase
NTES
$76.9B
| $228K | 0.03% |
+11,510
| New | +$220K |
|
520
Cenovus Energy
CVE
$55.4B
| $227K | 0.03% |
+10,999
| New | +$253K |
|
521
Ubiquiti
UI
$32B
| $227K | 0.03% |
+7,651
| New | +$244K |
|
|
VNET
522
VNET Group
VNET
$2.21B
| $226K | 0.03% |
+14,587
| New | +$269K |
|
|
BID
523
DELISTED
Sotheby's
BID
| $224K | 0.03% |
+5,187
| New | +$205K |
|
|
TWX
524
CALL
DELISTED
Time Warner Inc
TWX
| $224K | 0.03% |
+304
| New | +$24.2K |
|
|
SEE
525
CALL
DELISTED
Sealed Air
SEE
| $223K | 0.03% |
+392
| New | +$14.7K |
|
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.