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 |
iShares Russell 2000 ETF
IWM
|
+$58.5M |
| 2 |
Alphabet (Google) Class C
GOOG
|
+$56.5M |
| 3 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$44.1M |
| 4 |
Apple
AAPL
|
+$20.3M |
| 5 |
State Street SPDR S&P Oil & Gas Exploration & Production ETF
XOP
|
+$12.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$109M |
| 2 |
Meta Platforms (Facebook)
META
|
+$62.3M |
| 3 |
Invesco QQQ Trust
QQQ
|
+$36.2M |
| 4 |
Goldman Sachs
GS
|
+$27.1M |
| 5 |
Boeing
BA
|
+$24.7M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 0.49% |
| 2 | Consumer Discretionary | 0.48% |
| 3 | Technology | 0.4% |
| 4 | Financials | 0.25% |
| 5 | Industrials | 0.22% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1876
PUT
Melco Resorts & Entertainment
MLCO
$2.1B
| $754K | ﹤0.01% |
428
-358
| -46% | -$6.38K |
|
1877
PUT
Ares Capital
ARCC
$13.5B
| $752K | ﹤0.01% |
483
-115
| -19% | -$1.9K |
|
1878
PUT
Booz Allen Hamilton
BAH
$8.7B
| $752K | ﹤0.01% |
167
+144
| +626% | +$7.07K |
|
1879
PUT
Okta
OKTA
$24.1B
| $752K | ﹤0.01% |
118
-176
| -60% | -$10.4K |
|
1880
CALL
Sonos
SONO
$1.75B
| $752K | ﹤0.01% |
766
+283
| +59% | +$3.55K |
|
1881
PUT
Cracker Barrel
CBRL
$1.2B
| $751K | ﹤0.01% |
47
-118
| -72% | -$19.4K |
|
|
DVAX
1882
PUT
DELISTED
Dynavax Technologies
DVAX
| $751K | ﹤0.01% |
821
-368
| -31% | -$4.07K |
|
1883
Target
TGT
$62.1B
| $751K | ﹤0.01% |
+11,366
| New | +$875K |
|
1884
MarketAxess Holdings
MKTX
$4.15B
| $750K | ﹤0.01% |
3,551
+3,268
| +1,155% | +$676K |
|
1885
PUT
Viasat
VSAT
$9.79B
| $748K | ﹤0.01% |
127
+28
| +28% | +$1.82K |
|
1886
ConocoPhillips
COP
$147B
| $746K | ﹤0.01% |
11,973
-23,247
| -66% | -$1.58M |
|
1887
Radware
RDWR
$1.24B
| $746K | ﹤0.01% |
32,881
-49,417
| -60% | -$1.14M |
|
1888
CALL
GDS Holdings
GDS
$6.34B
| $745K | ﹤0.01% |
323
+159
| +97% | +$4.14K |
|
|
UCTT
1889
Ultra Clean Holdings
UCTT
$4.16B
| $743K | ﹤0.01% |
87,792
+74,034
| +538% | +$724K |
|
1890
CALL
Urban Outfitters
URBN
$5.99B
| $743K | ﹤0.01% |
224
-130
| -37% | -$4.86K |
|
1891
PUT
Liberty Media Series A
FWONA
$22.3B
| $741K | ﹤0.01% |
211
-139
| -40% | -$4.11K |
|
|
MFGP
1892
CALL
DELISTED
Micro Focus International plc. American Depositary Shares, each representing One Ordinary Share
MFGP
| $741K | ﹤0.01% |
356
+72
| +25% | +$1.54K |
|
1893
PUT
Ascendis Pharma A/S
ASND
$16.7B
| $739K | ﹤0.01% |
118
+68
| +136% | +$4.27K |
|
1894
PUT
National Beverage
FIZZ
$2.87B
| $739K | ﹤0.01% |
206
-254
| -55% | -$11.7K |
|
|
CHL
1895
PUT
DELISTED
China Mobile Limited
CHL
| $739K | ﹤0.01% |
154
+18
| +13% | +$867 |
|
1896
CALL
Globe Life
GL
$13.5B
| $737K | ﹤0.01% |
99
+84
| +560% | +$6.98K |
|
1897
CALL
Toll Brothers
TOL
$14B
| $737K | ﹤0.01% |
224
+64
| +40% | +$2.06K |
|
|
AXON
1898
PUT
Axon Enterprise
AXON
$40.5B
| $735K | ﹤0.01% |
168
-427
| -72% | -$22.2K |
|
1899
CALL
NMI Holdings
NMIH
$3.25B
| $735K | ﹤0.01% |
+412
| New | +$8.02K |
|
1900
PUT
Scotiabank
BNS
$106B
| $733K | ﹤0.01% |
147
+34
| +30% | +$1.83K |
|
Similar funds
Simplex Trading's Q4 2018 Portfolio in Review
As of Q4 2018, Simplex Trading held 8,576 positions worth $34.1B, up 9.5% from $31.1B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading's Q4 2018 filing shows 1,199 new, 2,701 increased, 2,877 reduced and 1,573 closed positions. Its largest new stake was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M. The largest sale was Amazon, an estimated $109M.
By sector, the portfolio is most concentrated in Communication Services at 0.49% of assets, down from 0.89% a quarter earlier, followed by Consumer Discretionary and Technology.
- Simplex Trading's largest Q4 2018 buy was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q4 2018, an estimated $58.5M increase.
- Simplex Trading's biggest Q4 2018 reduction was Amazon, cutting an estimated $109M.
- Simplex Trading fully exited Meta Platforms (Facebook) in Q4 2018, selling an estimated $62.3M.
- Simplex Trading's ten largest holdings make up 43% of its $34.1B portfolio in Q4 2018.
- Simplex Trading opened 1,199 new positions and closed 1,573 in Q4 2018.
- Simplex Trading's portfolio value rose 9.5% quarter-over-quarter to $34.1B.
Based on Simplex Trading's 13F filing for Q4 2018, filed 16 Jan 2019.