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 | |
|---|---|---|---|---|---|---|
426
PUT
Lennar Class B
LEN.B
$19.4B
| $7.32M | 0.03% |
1,481
-109
| -7% | -$4.51K |
|
427
PUT
Texas Instruments
TXN
$268B
| $7.29M | 0.03% |
661
-1,177
| -64% | -$127K |
|
|
SPLK
428
PUT
DELISTED
Splunk Inc
SPLK
| $7.28M | 0.03% |
735
+351
| +91% | +$38.1K |
|
429
CALL
Ulta Beauty
ULTA
$20.8B
| $7.28M | 0.03% |
312
-1,080
| -78% | -$261K |
|
430
CALL
Mercado Libre
MELI
$91.2B
| $7.23M | 0.03% |
242
-7,166
| -97% | -$2.26M |
|
431
PUT
Invesco CurrencyShares Euro Currency Trust
FXE
$332M
| $7.22M | 0.03% |
644
+513
| +392% | +$58.7K |
|
|
STMP
432
CALL
DELISTED
Stamps.com, Inc.
STMP
| $7.21M | 0.03% |
285
+192
| +206% | +$46.3K |
|
433
PUT
American International
AIG
$41.5B
| $7.19M | 0.03% |
1,357
-749
| -36% | -$40.5K |
|
434
PUT
Autodesk
ADSK
$43B
| $7.18M | 0.03% |
548
-559
| -50% | -$74.1K |
|
435
Prudential Financial
PRU
$41.3B
| $7.17M | 0.03% |
+76,719
| New | +$7.75M |
|
436
PUT
Best Buy
BBY
$18.4B
| $7.16M | 0.03% |
960
+235
| +32% | +$17.4K |
|
437
CALL
TJX Companies
TJX
$172B
| $7.15M | 0.03% |
1,502
-464
| -24% | -$20.4K |
|
438
CALL
CME Group
CME
$90.1B
| $7.15M | 0.03% |
436
-108
| -20% | -$17.6K |
|
|
439
PUT
TJX Companies
TJX
$172B
| $7.13M | 0.03% |
1,498
-86
| -5% | -$3.77K |
|
|
PPLC
440
CALL
DELISTED
PortfolioPlus S&P 500 ETF
PPLC
| $7.13M | 0.03% |
3,210
-1,051
| -25% | -$38.4K |
|
441
PUT
ASML
ASML
$692B
| $7.13M | 0.03% |
360
+169
| +88% | +$33.9K |
|
|
ALXN
442
PUT
DELISTED
Alexion Pharmaceuticals
ALXN
| $7.13M | 0.03% |
574
-518
| -47% | -$60.5K |
|
|
PPLI
443
CALL
People Inc
PPLI
$3.23B
| $7.12M | 0.03% |
2,613
-83,702
| -97% | -$2.29M |
|
|
444
CALL
Invesco CurrencyShares Euro Currency Trust
FXE
$332M
| $7.09M | 0.03% |
633
-93
| -13% | -$10.6K |
|
445
CALL
TransDigm Group
TDG
$66.8B
| $7.08M | 0.03% |
205
+21
| +11% | +$6.9K |
|
|
NBIS
446
PUT
Nebius Group N.V.
NBIS
$55.4B
| $7.07M | 0.03% |
1,968
+181
| +10% | +$6.31K |
|
447
PUT
Burlington
BURL
$22.3B
| $7.04M | 0.03% |
468
+122
| +35% | +$17.4K |
|
448
Goldman Sachs
GS
$324B
| $7.02M | 0.03% |
31,815
+4,369
| +16% | +$1.04M |
|
|
HES
449
CALL
DELISTED
Hess
HES
| $7.02M | 0.03% |
1,049
+527
| +101% | +$31.5K |
|
450
Weibo
WB
$1.93B
| $6.95M | 0.03% |
+78,308
| New | +$8.52M |
|
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.