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 | |
|---|---|---|---|---|---|---|
351
JD.com
JD
$40.7B
| $9.79M | 0.04% |
251,247
+244,904
| +3,861% | +$9.44M |
|
|
ALXN
352
CALL
DELISTED
Alexion Pharmaceuticals
ALXN
| $9.76M | 0.04% |
786
-336
| -30% | -$39.3K |
|
353
CALL
Vertex Pharmaceuticals
VRTX
$120B
| $9.72M | 0.04% |
572
-15
| -3% | -$2.33K |
|
|
RDS.A
354
PUT
DELISTED
Royal Dutch Shell PLC ADS Class A
RDS.A
| $9.7M | 0.04% |
1,397
-1,179
| -46% | -$81.7K |
|
355
PUT
Dollar Tree
DLTR
$23.5B
| $9.65M | 0.04% |
1,135
+250
| +28% | +$23.1K |
|
|
356
CALL
Dollar Tree
DLTR
$23.5B
| $9.6M | 0.04% |
1,129
+732
| +184% | +$67.5K |
|
357
CALL
Best Buy
BBY
$18.4B
| $9.56M | 0.04% |
1,282
-186
| -13% | -$13.7K |
|
|
FMI
358
CALL
DELISTED
Foundation Medicine, Inc.
FMI
| $9.5M | 0.04% |
695
+436
| +168% | +$39.6K |
|
359
PUT
Coca-Cola
KO
$354B
| $9.48M | 0.04% |
2,161
+789
| +58% | +$34.1K |
|
|
RHT
360
CALL
DELISTED
Red Hat Inc
RHT
| $9.47M | 0.04% |
705
+308
| +78% | +$49.7K |
|
361
CALL
PG&E
PCG
$39.9B
| $9.41M | 0.04% |
2,211
-99,795
| -98% | -$4.33M |
|
|
JNPR
362
CALL
DELISTED
Juniper Networks
JNPR
| $9.4M | 0.04% |
3,429
+1,501
| +78% | +$39.1K |
|
363
PUT
Delek US
DK
$4.06B
| $9.38M | 0.04% |
1,870
+655
| +54% | +$32.6K |
|
364
CALL
MGM Resorts International
MGM
$11.6B
| $9.37M | 0.04% |
3,228
+1,767
| +121% | +$57.1K |
|
365
PUT
ProShares Ultra S&P500
SSO
$8.02B
| $9.33M | 0.04% |
8,624
-3,824
| -31% | -$52.7K |
|
366
CALL
Norfolk Southern
NSC
$74.3B
| $9.32M | 0.04% |
618
-67
| -10% | -$9.79K |
|
|
367
PG&E
PCG
$39.9B
| $9.32M | 0.04% |
+219,024
| New | +$9.5M |
|
368
CALL
Kohl's
KSS
$2.16B
| $9.32M | 0.04% |
1,278
+237
| +23% | +$15.8K |
|
369
PUT
Automatic Data Processing
ADP
$97.2B
| $9.31M | 0.04% |
694
+411
| +145% | +$52.1K |
|
|
HES
370
PUT
DELISTED
Hess
HES
| $9.28M | 0.04% |
1,388
-182
| -12% | -$10.9K |
|
371
CALL
Direxion Daily Technology Bull 3x ETF
TECL
$5.56B
| $9.26M | 0.04% |
13,220
-25,540
| -66% | -$332K |
|
372
CALL
Darden Restaurants
DRI
$22.2B
| $9.24M | 0.04% |
863
+793
| +1,133% | +$72.6K |
|
|
373
PUT
MGM Resorts International
MGM
$11.6B
| $9.23M | 0.04% |
3,180
+1,558
| +96% | +$50.3K |
|
374
CALL
Diamondback Energy
FANG
$57.1B
| $9.13M | 0.04% |
694
+432
| +165% | +$53.6K |
|
375
CALL
CoStar Group
CSGP
$11.3B
| $9.04M | 0.04% |
2,190
+2,050
| +1,464% | +$78.9K |
|
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.