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 | |
|---|---|---|---|---|---|---|
|
MRNS
2301
CALL
DELISTED
Marinus Pharmaceuticals, Inc
MRNS
| $586K | ﹤0.01% |
207
+43
| +26% | +$953 |
|
|
ATH
2302
DELISTED
Athene Holding Ltd. Class A Common Shares
ATH
| $586K | ﹤0.01% |
13,383
+3,624
| +37% | +$170K |
|
2303
HP
HPQ
$23.5B
| $585K | ﹤0.01% |
+25,788
| New | +$575K |
|
|
VISN
2304
CALL
Vistance Networks Inc
VISN
$2.66B
| $584K | ﹤0.01% |
200
-55
| -22% | -$1.81K |
|
|
RDUS
2305
DELISTED
Radius Health, Inc.
RDUS
| $584K | ﹤0.01% |
19,829
+8,854
| +81% | +$280K |
|
2306
PUT
Welltower
WELL
$178B
| $583K | ﹤0.01% |
93
-33
| -26% | -$1.84K |
|
2307
PUT
Western Union
WU
$2.57B
| $583K | ﹤0.01% |
287
+188
| +190% | +$3.74K |
|
2308
CALL
National Vision
EYE
$1.6B
| $581K | ﹤0.01% |
+159
| New | +$5.54K |
|
2309
PUT
DexCom
DXCM
$27.6B
| $579K | ﹤0.01% |
244
+128
| +110% | +$2.71K |
|
2310
PUT
Transocean
RIG
$5.92B
| $579K | ﹤0.01% |
431
+21
| +5% | +$258 |
|
|
LL
2311
CALL
DELISTED
LL Flooring Holdings, Inc.
LL
| $579K | ﹤0.01% |
238
-169
| -42% | -$3.87K |
|
2312
CALL
Vuzix
VUZI
$190M
| $578K | ﹤0.01% |
776
+439
| +130% | +$2.78K |
|
|
CASA
2313
CALL
DELISTED
Casa Systems, Inc. Common Stock
CASA
| $578K | ﹤0.01% |
+354
| New | +$8.05K |
|
2314
PUT
Cal-Maine
CALM
$4.28B
| $577K | ﹤0.01% |
126
+111
| +740% | +$5.36K |
|
2315
iShares MSCI Pacific ex Japan ETF
EPP
$2.18B
| $577K | ﹤0.01% |
12,561
-108
| -0.9% | -$5.1K |
|
2316
CALL
RPM International
RPM
$13.7B
| $577K | ﹤0.01% |
99
-220
| -69% | -$11K |
|
2317
CALL
Sunrun
RUN
$2.37B
| $577K | ﹤0.01% |
439
+228
| +108% | +$2.48K |
|
|
XLRN
2318
PUT
DELISTED
Acceleron Pharma
XLRN
| $577K | ﹤0.01% |
119
+79
| +198% | +$2.88K |
|
2319
PUT
Barclays
BCS
$94.1B
| $576K | ﹤0.01% |
601
-216
| -26% | -$2.34K |
|
2320
PUT
AstraZeneca
AZN
$263B
| $575K | ﹤0.01% |
82
-21
| -20% | -$1.51K |
|
2321
CALL
Ryder
R
$10.3B
| $574K | ﹤0.01% |
80
+49
| +158% | +$3.44K |
|
2322
Helmerich & Payne
HP
$3.53B
| $573K | ﹤0.01% |
8,999
+5,784
| +180% | +$394K |
|
2323
CALL
Zebra Technologies
ZBRA
$12.4B
| $573K | ﹤0.01% |
40
-157
| -80% | -$23.1K |
|
2324
PUT
Canadian National Railway
CNI
$78.3B
| $572K | ﹤0.01% |
70
+63
| +900% | +$5.01K |
|
2325
ConocoPhillips
COP
$147B
| $572K | ﹤0.01% |
8,225
+5,853
| +247% | +$390K |
|
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.