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 | |
|---|---|---|---|---|---|---|
276
PUT
SLB Ltd
SLB
$70.7B
| $471K | 0.06% |
+1,400
| New | +$129K |
|
277
CALL
Citigroup
C
$221B
| $469K | 0.06% |
+1,661
| New | +$88.2K |
|
278
PUT
Philip Morris
PM
$296B
| $468K | 0.06% |
+852
| New | +$73.2K |
|
279
CALL
eBay
EBAY
$48.5B
| $467K | 0.06% |
+3,355
| New | +$76.1K |
|
|
XONE
280
PUT
DELISTED
The ExOne Company
XONE
| $464K | 0.06% |
+282
| New | +$5.67K |
|
281
Parker-Hannifin
PH
$123B
| $463K | 0.06% |
+3,592
| New | +$441K |
|
282
CALL
Qualcomm
QCOM
$178B
| $460K | 0.06% |
+1,103
| New | +$80.7K |
|
283
Danaher
DHR
$134B
| $459K | 0.06% |
+7,970
| New | +$432K |
|
284
CALL
Occidental Petroleum
OXY
$57.5B
| $455K | 0.06% |
+2,025
| New | +$168K |
|
285
Regeneron Pharmaceuticals
REGN
$68.2B
| $455K | 0.06% |
+1,110
| New | +$437K |
|
286
CALL
Lowe's Companies
LOW
$113B
| $454K | 0.06% |
+287
| New | +$17.2K |
|
287
PUT
Yelp
YELP
$1.35B
| $454K | 0.06% |
+519
| New | +$30.7K |
|
288
FirstEnergy
FE
$28.7B
| $453K | 0.05% |
+11,606
| New | +$426K |
|
289
PUT
GameStop
GME
$9.58B
| $446K | 0.05% |
+2,796
| New | +$27K |
|
290
NCR Voyix
VYX
$1.05B
| $446K | 0.05% |
+24,962
| New | +$438K |
|
291
Apollo Global Management
APO
$68.7B
| $445K | 0.05% |
+18,892
| New | +$436K |
|
|
BLUE
292
CALL
DELISTED
bluebird bio
BLUE
| $439K | 0.05% |
+11
| New | +$7.35K |
|
293
Strategy Inc
MSTR
$34.6B
| $439K | 0.05% |
+27,010
| New | +$427K |
|
|
BWLD
294
CALL
DELISTED
Buffalo Wild Wings, Inc.
BWLD
| $439K | 0.05% |
+144
| New | +$22.4K |
|
295
Clorox
CLX
$11.3B
| $438K | 0.05% |
+4,199
| New | +$420K |
|
|
P
296
DELISTED
Pandora Media Inc
P
| $437K | 0.05% |
+24,501
| New | +$484K |
|
|
RDC
297
DELISTED
Rowan Companies Plc
RDC
| $435K | 0.05% |
+18,646
| New | +$431K |
|
|
TLM
298
CALL
DELISTED
TALISMAN ENERGY INC
TLM
| $435K | 0.05% |
+1,509
| New | +$9.48K |
|
299
Thermo Fisher Scientific
TMO
$213B
| $433K | 0.05% |
+3,452
| New | +$420K |
|
|
PAY
300
CALL
DELISTED
Verifone Systems Inc
PAY
| $433K | 0.05% |
+363
| New | +$12.8K |
|
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.