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 | |
|---|---|---|---|---|---|---|
376
PUT
Cintas
CTAS
$80.6B
| $9.03M | 0.04% |
1,952
+1,664
| +578% | +$74.9K |
|
377
PUT
Estee Lauder
EL
$29.9B
| $9.02M | 0.04% |
632
+285
| +82% | +$42.2K |
|
378
CALL
Illumina
ILMN
$28.9B
| $8.99M | 0.04% |
331
+149
| +82% | +$37.9K |
|
379
Philip Morris
PM
$303B
| $8.85M | 0.03% |
109,635
+70,943
| +183% | +$6.02M |
|
380
PUT
Marathon Petroleum
MPC
$92.2B
| $8.85M | 0.03% |
1,261
+405
| +47% | +$30.9K |
|
381
PUT
Devon Energy
DVN
$51.8B
| $8.84M | 0.03% |
2,010
-333
| -14% | -$12.9K |
|
382
PUT
Five Below
FIVE
$11.3B
| $8.81M | 0.03% |
902
+629
| +230% | +$50.5K |
|
|
SCHW
383
CALL
Charles Schwab
SCHW
$175B
| $8.77M | 0.03% |
1,716
+1,021
| +147% | +$56.6K |
|
|
WLL
384
PUT
DELISTED
Whiting Petroleum Corporation
WLL
| $8.72M | 0.03% |
22
+7
| +47% | +$24.2K |
|
385
CALL
Nexstar Media Group
NXST
$5.55B
| $8.69M | 0.03% |
1,184
+1,061
| +863% | +$71.7K |
|
386
PUT
Phillips 66
PSX
$84.8B
| $8.67M | 0.03% |
772
+5
| +0.7% | +$562 |
|
387
Comcast
CMCSA
$84B
| $8.66M | 0.03% |
263,994
+202,877
| +332% | +$6.61M |
|
388
PUT
Vertex Pharmaceuticals
VRTX
$120B
| $8.65M | 0.03% |
509
+321
| +171% | +$49.8K |
|
|
ATHN
389
PUT
DELISTED
Athenahealth, Inc.
ATHN
| $8.64M | 0.03% |
543
+472
| +665% | +$70K |
|
390
CALL
General Dynamics
GD
$101B
| $8.61M | 0.03% |
462
+253
| +121% | +$51.8K |
|
391
CALL
XPO
XPO
$25.1B
| $8.59M | 0.03% |
2,478
-17,753
| -88% | -$644K |
|
|
392
CALL
Devon Energy
DVN
$51.8B
| $8.55M | 0.03% |
1,945
+1,054
| +118% | +$40.8K |
|
|
APC
393
CALL
DELISTED
Anadarko Petroleum
APC
| $8.53M | 0.03% |
1,165
-208
| -15% | -$14.1K |
|
394
PUT
Markel Group
MKL
$24.3B
| $8.46M | 0.03% |
+78
| New | +$88.1K |
|
395
CALL
Cummins
CMI
$91.2B
| $8.45M | 0.03% |
635
-5,168
| -89% | -$774K |
|
396
PUT
Dropbox
DBX
$6.69B
| $8.35M | 0.03% |
+2,576
| New | +$80.6K |
|
397
Walmart Inc
WMT
$870B
| $8.26M | 0.03% |
289,347
+157,221
| +119% | +$4.47M |
|
398
PUT
Martin Marietta Materials
MLM
$33.1B
| $8.2M | 0.03% |
367
+215
| +141% | +$45.9K |
|
399
PUT
Skyworks Solutions
SWKS
$9.5B
| $8.16M | 0.03% |
844
+230
| +37% | +$22.4K |
|
400
PUT
Medtronic
MDT
$105B
| $8.13M | 0.03% |
950
-382
| -29% | -$31.9K |
|
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.