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 |
Invesco QQQ Trust
QQQ
|
+$86.9M |
| 2 |
Walt Disney
DIS
|
+$25.5M |
| 3 |
Baidu
BIDU
|
+$12.3M |
| 4 |
Alphabet (Google) Class A
GOOGL
|
+$12.3M |
| 5 |
RHT
Red Hat Inc
RHT
|
+$11.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$66M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$60.3M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$33.9M |
| 4 |
Apple
AAPL
|
+$21.1M |
| 5 |
State Street Financial Select Sector SPDR ETF
XLF
|
+$18.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 0.58% |
| 2 | Technology | 0.42% |
| 3 | Healthcare | 0.34% |
| 4 | Consumer Discretionary | 0.29% |
| 5 | Industrials | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2101
PUT
Ameriprise Financial
AMP
$46.8B
| $883K | ﹤0.01% |
69
-16
| -19% | -$1.99K |
|
2102
CALL
GrafTech
EAF
$194M
| $882K | ﹤0.01% |
69
+65
| +1,625% | +$8.63K |
|
2103
PUT
Lithia Motors
LAD
$7.78B
| $881K | ﹤0.01% |
95
+66
| +228% | +$5.74K |
|
2104
CALL
Mattel
MAT
$4.17B
| $881K | ﹤0.01% |
678
+179
| +36% | +$2.39K |
|
|
WMGI
2105
CALL
DELISTED
Wright Medical Group Inc
WMGI
| $880K | ﹤0.01% |
280
+268
| +2,233% | +$8.14K |
|
2106
CALL
Chord Energy
CHRD
$7.79B
| $879K | ﹤0.01% |
1,456
+1,035
| +246% | +$6.2K |
|
|
HTZ
2107
PUT
DELISTED
Hertz Global Holdings, Inc.
HTZ
| $878K | ﹤0.01% |
582
-480
| -45% | -$6.98K |
|
|
X
2108
DELISTED
US Steel
X
| $877K | ﹤0.01% |
+45,008
| New | +$957K |
|
2109
Yelp
YELP
$1.38B
| $877K | ﹤0.01% |
25,441
-34,212
| -57% | -$1.24M |
|
|
CLDR
2110
CALL
DELISTED
Cloudera, Inc.
CLDR
| $877K | ﹤0.01% |
802
+716
| +833% | +$9.21K |
|
|
AXDX
2111
CALL
DELISTED
Accelerate Diagnostics
AXDX
| $876K | ﹤0.01% |
42
+27
| +180% | +$5.06K |
|
|
SMAR
2112
CALL
DELISTED
Smartsheet Inc.
SMAR
| $876K | ﹤0.01% |
215
+125
| +139% | +$4.32K |
|
2113
ProShares UltraPro Dow 30
UDOW
$849M
| $875K | ﹤0.01% |
+36,292
| New | +$806K |
|
2114
CALL
BJ's Restaurants
BJRI
$1.41B
| $874K | ﹤0.01% |
185
+76
| +70% | +$3.81K |
|
|
TIVO
2115
PUT
DELISTED
Tivo Inc
TIVO
| $871K | ﹤0.01% |
935
+314
| +51% | +$3.25K |
|
2116
CALL
Encompass Health
EHC
$11.2B
| $870K | ﹤0.01% |
187
+78
| +72% | +$3.95K |
|
|
TECD
2117
PUT
DELISTED
Tech Data Corp
TECD
| $870K | ﹤0.01% |
85
-21
| -20% | -$2.05K |
|
2118
CALL
Saic
SAIC
$5.03B
| $869K | ﹤0.01% |
113
+100
| +769% | +$7.04K |
|
2119
PUT
Melco Resorts & Entertainment
MLCO
$2.1B
| $867K | ﹤0.01% |
384
-44
| -10% | -$956 |
|
|
BOLD
2120
CALL
DELISTED
Audentes Therapeutics, Inc
BOLD
| $866K | ﹤0.01% |
222
+221
| +22,100% | +$6.34K |
|
2121
CALL
Hexcel
HXL
$8.32B
| $864K | ﹤0.01% |
125
+109
| +681% | +$7.33K |
|
|
MRSH
2122
CALL
Marsh
MRSH
$86.3B
| $863K | ﹤0.01% |
92
-30
| -25% | -$2.65K |
|
2123
Immersion
IMMR
$216M
| $860K | ﹤0.01% |
102,018
+58,611
| +135% | +$537K |
|
2124
PUT
Bruker
BRKR
$9.2B
| $857K | ﹤0.01% |
+223
| New | +$8.05K |
|
2125
CALL
Koppers
KOP
$966M
| $857K | ﹤0.01% |
330
+253
| +329% | +$5.95K |
|
Similar funds
Simplex Trading's Q1 2019 Portfolio in Review
As of Q1 2019, Simplex Trading held 8,479 positions worth $36B, up 5.5% from $34.1B the previous quarter. Its ten largest holdings account for 35% of the portfolio.
Simplex Trading's Q1 2019 filing shows 1,472 new, 3,049 increased, 2,419 reduced and 1,324 closed positions. Its largest new stake was Walt Disney: 228,471 shares worth $25.4M. The largest sale was Amazon, an estimated $66M.
By sector, the portfolio is most concentrated in Communication Services at 0.58% of assets, up from 0.49% a quarter earlier, followed by Technology and Healthcare.
- Simplex Trading's largest Q1 2019 buy was Walt Disney: 228,471 shares worth $25.4M.
- Simplex Trading added most to Invesco QQQ Trust in Q1 2019, an estimated $86.9M increase.
- Simplex Trading's biggest Q1 2019 reduction was iShares Russell 2000 ETF, cutting an estimated $60.3M.
- Simplex Trading fully exited Amazon in Q1 2019, selling an estimated $66M.
- Simplex Trading's ten largest holdings make up 35% of its $36B portfolio in Q1 2019.
- Simplex Trading opened 1,472 new positions and closed 1,324 in Q1 2019.
- Simplex Trading's portfolio value rose 5.5% quarter-over-quarter to $36B.
Based on Simplex Trading's 13F filing for Q1 2019, filed 18 Apr 2019.