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 |
Alphabet (Google) Class C
GOOG
|
+$40.1M |
| 2 |
Berkshire Hathaway Class B
BRK.B
|
+$12.5M |
| 3 |
Alibaba
BABA
|
+$10.5M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$9.89M |
| 5 |
Intel
INTC
|
+$9.83M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$35.7M |
| 2 |
Gilead Sciences
GILD
|
+$32.3M |
| 3 |
Amazon
AMZN
|
+$29M |
| 4 |
Booking.com
BKNG
|
+$28.4M |
| 5 |
Baidu
BIDU
|
+$13.3M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 7.76% |
| 2 | Consumer Discretionary | 7.62% |
| 3 | Healthcare | 7.24% |
| 4 | Technology | 6.95% |
| 5 | Financials | 4.83% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
WW
326
PUT
DELISTED
WW International
WW
| $510K | 0.06% |
505
+153
| +43% | +$2.26K |
|
327
Workday
WDAY
$32.9B
| $505K | 0.06% |
5,993
-510
| -8% | -$43.1K |
|
328
PUT
Yelp
YELP
$1.35B
| $503K | 0.06% |
632
+113
| +22% | +$5.59K |
|
329
PUT
Zillow
ZG
$7.19B
| $503K | 0.06% |
1,650
+648
| +65% | +$22.9K |
|
330
PUT
AbbVie
ABBV
$447B
| $502K | 0.06% |
1,872
+275
| +17% | +$16.6K |
|
331
Comcast
CMCSA
$84.1B
| $499K | 0.06% |
17,678
+3,846
| +28% | +$111K |
|
|
GRMN
332
Garmin
GRMN
$46.5B
| $497K | 0.06% |
10,460
+2,388
| +30% | +$122K |
|
|
ALXN
333
DELISTED
Alexion Pharmaceuticals
ALXN
| $497K | 0.06% |
2,869
+1,821
| +174% | +$330K |
|
334
CALL
Marathon Petroleum
MPC
$93B
| $490K | 0.06% |
922
-550
| -37% | -$26.4K |
|
335
Las Vegas Sands
LVS
$30.1B
| $485K | 0.06% |
8,829
-51,222
| -85% | -$2.85M |
|
336
CALL
Costco
COST
$409B
| $484K | 0.06% |
551
+294
| +114% | +$43.1K |
|
|
XLNX
337
DELISTED
Xilinx Inc
XLNX
| $483K | 0.06% |
+11,437
| New | +$469K |
|
|
CIE
338
DELISTED
Cobalt International Energy, Inc
CIE
| $482K | 0.06% |
3,422
-768
| -18% | -$104K |
|
339
PUT
Regeneron Pharmaceuticals
REGN
$68.5B
| $477K | 0.06% |
353
-50
| -12% | -$21.2K |
|
340
PUT
Halliburton
HAL
$27.5B
| $472K | 0.05% |
+723
| New | +$30.1K |
|
341
ProShares UltraShort QQQ
QID
$250M
| $470K | 0.05% |
+159
| New | +$481K |
|
342
CALL
Precigen
PGEN
$1.89B
| $464K | 0.05% |
207
+157
| +314% | +$5.64K |
|
|
SUNE
343
DELISTED
SUNEDISON, INC COM
SUNE
| $464K | 0.05% |
19,365
-49,566
| -72% | -$1.07M |
|
344
Hershey
HSY
$34.8B
| $463K | 0.05% |
+4,594
| New | +$479K |
|
345
Viatris
VTRS
$19.9B
| $463K | 0.05% |
7,816
+285
| +4% | +$16.2K |
|
346
Fossil Group
FOSL
$244M
| $462K | 0.05% |
5,610
+4,113
| +275% | +$378K |
|
347
PUT
Microsoft
MSFT
$2.89T
| $462K | 0.05% |
1,097
-318
| -22% | -$13.8K |
|
348
Consolidated Edison
ED
$41.1B
| $461K | 0.05% |
7,569
+3,790
| +100% | +$246K |
|
349
CALL
IBM
IBM
$193B
| $461K | 0.05% |
1,327
+578
| +77% | +$87.7K |
|
|
ESPR
350
CALL
DELISTED
Esperion Therapeutics
ESPR
| $460K | 0.05% |
220
+180
| +450% | +$11.6K |
|
Similar funds
Simplex Trading's Q1 2015 Portfolio in Review
As of Q1 2015, Simplex Trading held 6,670 positions worth $860M, up 4.2% from $826M the previous quarter. Its ten largest holdings account for 15% of the portfolio.
Simplex Trading's Q1 2015 filing shows 1,973 new, 1,386 increased, 1,513 reduced and 1,643 closed positions. Its largest new stake was Alphabet (Google) Class C: 1,497,580 shares worth $41.4M. The largest sale was Apple, an estimated $35.7M.
By sector, the portfolio is most concentrated in Communication Services at 7.8% of assets, up from 4.8% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q1 2015 buy was Alphabet (Google) Class C: 1,497,580 shares worth $41.4M.
- Simplex Trading added most to Alibaba in Q1 2015, an estimated $10.5M increase.
- Simplex Trading's biggest Q1 2015 reduction was Apple, cutting an estimated $35.7M.
- Simplex Trading fully exited Amazon in Q1 2015, selling an estimated $29M.
- Simplex Trading's ten largest holdings make up 15% of its $860M portfolio in Q1 2015.
- Simplex Trading opened 1,973 new positions and closed 1,643 in Q1 2015.
- Simplex Trading's portfolio value rose 4.2% quarter-over-quarter to $860M.
Based on Simplex Trading's 13F filing for Q1 2015, filed 21 Apr 2015.