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 | |
|---|---|---|---|---|---|---|
1701
PUT
Strategic Education
STRA
$1.71B
| $1.11M | ﹤0.01% |
98
+7
| +8% | +$749 |
|
1702
CALL
EPAM Systems
EPAM
$4.69B
| $1.11M | ﹤0.01% |
89
+28
| +46% | +$3.37K |
|
1703
CALL
Roper Technologies
ROP
$36.3B
| $1.1M | ﹤0.01% |
40
-27
| -40% | -$7.45K |
|
1704
CALL
Cimpress
CMPR
$2.37B
| $1.1M | ﹤0.01% |
76
+16
| +27% | +$2.31K |
|
1705
PUT
Canadian Solar
CSIQ
$906M
| $1.1M | ﹤0.01% |
900
+502
| +126% | +$7.54K |
|
1706
Puma Biotechnology
PBYI
$406M
| $1.1M | ﹤0.01% |
+18,629
| New | +$1.08M |
|
|
NVO
1707
Novo Nordisk
NVO
$216B
| $1.1M | ﹤0.01% |
47,664
+26,958
| +130% | +$641K |
|
1708
CALL
Leggett & Platt
LEG
$1.52B
| $1.1M | ﹤0.01% |
+246
| New | +$10.6K |
|
1709
CALL
Tapestry
TPR
$28.8B
| $1.1M | ﹤0.01% |
235
-24,375
| -99% | -$1.17M |
|
1710
CALL
Southern Copper
SCCO
$141B
| $1.1M | ﹤0.01% |
252
+134
| +114% | +$6.43K |
|
1711
PUT
Saia
SAIA
$11.3B
| $1.09M | ﹤0.01% |
+135
| New | +$10.4K |
|
1712
PUT
Corning
GLW
$126B
| $1.09M | ﹤0.01% |
396
+14
| +4% | +$387 |
|
|
AAWW
1713
CALL
DELISTED
Atlas Air Worldwide Holdings, Inc.
AAWW
| $1.09M | ﹤0.01% |
152
+105
| +223% | +$7.09K |
|
1714
CALL
YPF
YPF
$20.2B
| $1.09M | ﹤0.01% |
800
-53,422
| -99% | -$1.04M |
|
1715
BGC Group
BGC
$5.58B
| $1.08M | ﹤0.01% |
148,918
+107,518
| +260% | +$860K |
|
1716
PUT
Itaú Unibanco
ITUB
$91.3B
| $1.08M | ﹤0.01% |
2,154
+1,406
| +188% | +$8.74K |
|
1717
PUT
Lumentum
LITE
$59.4B
| $1.08M | ﹤0.01% |
187
-31
| -14% | -$1.85K |
|
1718
CALL
Coherent
COHR
$55.2B
| $1.08M | ﹤0.01% |
249
+123
| +98% | +$5.43K |
|
|
UN
1719
CALL
DELISTED
Unilever NV New York Registry Shares
UN
| $1.08M | ﹤0.01% |
194
-8
| -4% | -$447 |
|
1720
CALL
STMicroelectronics
STM
$46B
| $1.08M | ﹤0.01% |
488
+11
| +2% | +$256 |
|
1721
ProShares Short 20+ Year Treasury ETF
TBF
$84.9M
| $1.08M | ﹤0.01% |
47,660
+29,338
| +160% | +$678K |
|
|
CEO
1722
CALL
DELISTED
CNOOC Limited
CEO
| $1.08M | ﹤0.01% |
63
+47
| +294% | +$7.81K |
|
1723
PUT
Ross Stores
ROST
$76.6B
| $1.08M | ﹤0.01% |
127
-136
| -52% | -$11.1K |
|
|
PRSP
1724
PUT
DELISTED
Perspecta Inc. Common Stock
PRSP
| $1.08M | ﹤0.01% |
+524
| New | +$11.7K |
|
1725
PUT
Brinker International
EAT
$8.02B
| $1.07M | ﹤0.01% |
226
+95
| +73% | +$4.21K |
|
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.