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 |
Apple
AAPL
|
+$34.5M |
| 2 |
Micron Technology
MU
|
+$33.9M |
| 3 |
Berkshire Hathaway Class B
BRK.B
|
+$30.8M |
| 4 |
NVIDIA
NVDA
|
+$23.5M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$22.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
TWX
Time Warner Inc
TWX
|
+$34.8M |
| 2 |
Amazon
AMZN
|
+$31.2M |
| 3 |
Tesla
TSLA
|
+$17.6M |
| 4 |
Netflix
NFLX
|
+$15.5M |
| 5 |
Advanced Micro Devices
AMD
|
+$12.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 1.23% |
| 2 | Consumer Discretionary | 0.92% |
| 3 | Communication Services | 0.73% |
| 4 | Financials | 0.62% |
| 5 | Industrials | 0.6% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
226
PUT
Wayfair
W
$11.3B
| $15.7M | 0.06% |
1,318
+904
| +218% | +$78.5K |
|
227
CALL
Southwest Airlines
LUV
$23.5B
| $15.6M | 0.06% |
3,072
-197
| -6% | -$10.4K |
|
228
PUT
Electronic Arts
EA
$52.4B
| $15.5M | 0.06% |
1,101
-370
| -25% | -$48.1K |
|
229
PUT
ConocoPhillips
COP
$145B
| $15.5M | 0.06% |
2,222
+1,097
| +98% | +$73.1K |
|
230
PUT
Prudential Financial
PRU
$41.3B
| $15.4M | 0.06% |
1,646
+983
| +148% | +$99.3K |
|
231
CALL
Blackrock
BLK
$161B
| $15.4M | 0.06% |
308
+64
| +26% | +$33.8K |
|
232
Alibaba
BABA
$279B
| $15.3M | 0.06% |
82,609
+1,840
| +2% | +$351K |
|
233
IBM
IBM
$197B
| $15.3M | 0.06% |
114,380
+68,404
| +149% | +$9.54M |
|
|
234
CALL
Advanced Micro Devices
AMD
$909B
| $15.2M | 0.06% |
10,142
+7,980
| +369% | +$101K |
|
235
PUT
General Motors
GM
$74.7B
| $15.2M | 0.06% |
3,856
+695
| +22% | +$27.4K |
|
|
236
Tesla
TSLA
$1.42T
| $15.1M | 0.06% |
661,125
-863,910
| -57% | -$17.6M |
|
237
CALL
Oracle
ORCL
$363B
| $15.1M | 0.06% |
3,430
-1,777
| -34% | -$81.9K |
|
238
CALL
Universal Display
OLED
$3.86B
| $15.1M | 0.06% |
1,750
+273
| +18% | +$26K |
|
239
CALL
Autodesk
ADSK
$43.1B
| $15M | 0.06% |
1,142
+55
| +5% | +$7.29K |
|
|
XYZ
240
CALL
Block Inc
XYZ
$46.2B
| $14.8M | 0.06% |
2,395
-1,982
| -45% | -$109K |
|
241
PUT
Philip Morris
PM
$304B
| $14.7M | 0.06% |
1,824
+80
| +5% | +$6.79K |
|
242
PUT
ProShares UltraShort Health Care
RXD
$3.35M
| $14.7M | 0.06% |
1,020
+497
| +95% | +$57.5K |
|
|
VMW
243
PUT
DELISTED
VMware, Inc
VMW
| $14.6M | 0.06% |
993
-15
| -1% | -$2.07K |
|
244
CALL
ServiceNow
NOW
$99.6B
| $14.3M | 0.06% |
4,155
+1,260
| +44% | +$43.7K |
|
|
UWC
245
CALL
DELISTED
PROSHARES TR ULTRA RUSSELL3000
UWC
| $14.3M | 0.06% |
2,584
+1,656
| +178% | +$9.18M |
|
|
ATVI
246
PUT
DELISTED
Activision Blizzard
ATVI
| $14.2M | 0.06% |
1,861
-751
| -29% | -$53.1K |
|
247
CALL
Sarepta Therapeutics
SRPT
$1.7B
| $14.1M | 0.06% |
1,068
+823
| +336% | +$77.6K |
|
248
PUT
Expedia Group
EXPE
$31.8B
| $14.1M | 0.06% |
1,174
-1,171
| -50% | -$135K |
|
249
CALL
Eli Lilly
LLY
$1.04T
| $14.1M | 0.06% |
1,653
-310
| -16% | -$25.5K |
|
250
Morgan Stanley
MS
$344B
| $14M | 0.06% |
295,989
+246,653
| +500% | +$12.9M |
|
Similar funds
Simplex Trading's Q2 2018 Portfolio in Review
As of Q2 2018, Simplex Trading held 8,400 positions worth $25.5B, up 1,022% from $2.27B the previous quarter. Its ten largest holdings account for 29% of the portfolio.
Simplex Trading's Q2 2018 filing shows 2,282 new, 2,314 increased, 2,591 reduced and 1,035 closed positions. Its largest new stake was Alphabet (Google) Class C: 291,860 shares worth $16.3M. The largest sale was Time Warner Inc, an estimated $34.8M.
By sector, the portfolio is most concentrated in Technology at 1.2% of assets, down from 6.2% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q2 2018 buy was Alphabet (Google) Class C: 291,860 shares worth $16.3M.
- Simplex Trading added most to Apple in Q2 2018, an estimated $34.5M increase.
- Simplex Trading's biggest Q2 2018 reduction was Amazon, cutting an estimated $31.2M.
- Simplex Trading fully exited Time Warner Inc in Q2 2018, selling an estimated $34.8M.
- Simplex Trading's ten largest holdings make up 29% of its $25.5B portfolio in Q2 2018.
- Simplex Trading opened 2,282 new positions and closed 1,035 in Q2 2018.
- Simplex Trading's portfolio value rose 1,022% quarter-over-quarter to $25.5B.
Based on Simplex Trading's 13F filing for Q2 2018, filed 30 Jul 2018.