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 |
AMC Entertainment Holdings
AMC
|
+$39.3M |
| 2 |
AT&T
T
|
+$29.8M |
| 3 |
NVIDIA
NVDA
|
+$28.3M |
| 4 |
Micron Technology
MU
|
+$22.9M |
| 5 |
Baidu
BIDU
|
+$22.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Invesco QQQ Trust
QQQ
|
+$36.1M |
| 2 |
Tesla
TSLA
|
+$35.2M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$25.9M |
| 4 |
Palantir
PLTR
|
+$25.7M |
| 5 |
Wells Fargo
WFC
|
+$20.4M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.47% |
| 2 | Consumer Discretionary | 0.39% |
| 3 | Communication Services | 0.27% |
| 4 | Healthcare | 0.26% |
| 5 | Financials | 0.25% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
5151
PUT
CarGurus
CARG
$3.25B
| $272K | ﹤0.01% |
10,400
+10,329
| +14,548% | +$268K |
|
5152
PUT
Deluxe
DLX
$1.19B
| $272K | ﹤0.01% |
5,700
+5,665
| +16,186% | +$255K |
|
|
MITT
5153
TPG Mortgage Investment Trust
MITT
$225M
| $272K | ﹤0.01% |
21,308
-10,389
| -33% | -$130K |
|
|
SEI
5154
PUT
Solaris Energy Infrastructure
SEI
$3.14B
| $272K | ﹤0.01% |
28,000
+27,697
| +9,141% | +$293K |
|
|
CASA
5155
PUT
DELISTED
Casa Systems, Inc. Common Stock
CASA
| $272K | ﹤0.01% |
30,700
+29,983
| +4,182% | +$266K |
|
5156
PUT
B2Gold
BTG
$5.13B
| $271K | ﹤0.01% |
64,500
+63,288
| +5,222% | +$309K |
|
|
RPAI
5157
PUT
DELISTED
RETAIL PROPERTIES OF AMERICA, INC.
RPAI
| $271K | ﹤0.01% |
23,700
+23,155
| +4,249% | +$271K |
|
5158
CALL
Amplify Energy
AMPY
$155M
| $270K | ﹤0.01% |
66,700
+65,252
| +4,506% | +$217K |
|
5159
PUT
Curis
CRIS
$9.67M
| $270K | ﹤0.01% |
84
+80
| +2,000% | +$361K |
|
5160
CALL
Eagle Materials
EXP
$6.35B
| $270K | ﹤0.01% |
1,900
+1,898
| +94,900% | +$273K |
|
5161
CALL
LSB Industries
LXU
$794M
| $270K | ﹤0.01% |
58,110
+57,208
| +6,342% | +$272K |
|
|
ACH
5162
PUT
Accendra Health
ACH
$256M
| $270K | ﹤0.01% |
+6,400
| New | +$249K |
|
5163
PUT
ProQR Therapeutics
PRQR
$251M
| $270K | ﹤0.01% |
40,200
+39,308
| +4,407% | +$253K |
|
5164
Tenaris
TS
$28.6B
| $270K | ﹤0.01% |
+12,373
| New | +$280K |
|
5165
Western Midstream Partners
WES
$19.6B
| $270K | ﹤0.01% |
12,620
-2,180
| -15% | -$45.2K |
|
|
DS
5166
DELISTED
Drive Shack Inc.
DS
| $270K | ﹤0.01% |
81,647
-150,245
| -65% | -$481K |
|
5167
CALL
Alkermes
ALKS
$8.39B
| $269K | ﹤0.01% |
+11,000
| New | +$245K |
|
5168
PUT
Essential Utilities
WTRG
$11.4B
| $269K | ﹤0.01% |
5,900
+5,830
| +8,329% | +$274K |
|
|
INFN
5169
PUT
DELISTED
Infinera Corporation Common Stock
INFN
| $269K | ﹤0.01% |
26,400
+26,076
| +8,048% | +$253K |
|
|
GENE
5170
PUT
DELISTED
Genetic Technologies Ltd.
GENE
| $269K | ﹤0.01% |
12,700
+12,643
| +22,181% | +$255K |
|
|
RDUS
5171
CALL
DELISTED
Radius Health, Inc.
RDUS
| $269K | ﹤0.01% |
14,800
+14,755
| +32,789% | +$293K |
|
5172
PUT
Ingersoll Rand
IR
$33B
| $268K | ﹤0.01% |
5,500
+5,333
| +3,193% | +$262K |
|
5173
PUT
monday.com
MNDY
$3.73B
| $268K | ﹤0.01% |
+1,200
| New | +$261K |
|
5174
Navigator Holdings
NVGS
$1.37B
| $268K | ﹤0.01% |
24,566
+12,592
| +105% | +$133K |
|
|
5175
PUT
Navigator Holdings
NVGS
$1.37B
| $268K | ﹤0.01% |
24,500
+24,473
| +90,641% | +$259K |
|
Similar funds
Simplex Trading's Q2 2021 Portfolio in Review
As of Q2 2021, Simplex Trading held 11,184 positions worth $104B, up 86% from $55.7B the previous quarter. Its ten largest holdings account for 40% of the portfolio.
Simplex Trading deployed $97.5B of net new capital in Q2 2021, opening 2,250 new positions and adding to 6,673 existing holdings. Its largest new stake was AT&T: 1,311,180 shares worth $28.5M.
By sector, the portfolio is most concentrated in Technology at 0.47% of assets, down from 0.65% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, an estimated $25.9M trimmed.
- Simplex Trading's largest Q2 2021 buy was AT&T: 1,311,180 shares worth $28.5M.
- Simplex Trading added most to AMC Entertainment Holdings in Q2 2021, an estimated $39.3M increase.
- Simplex Trading's biggest Q2 2021 reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, cutting an estimated $25.9M.
- Simplex Trading fully exited Invesco QQQ Trust in Q2 2021, selling an estimated $36.1M.
- Simplex Trading's ten largest holdings make up 40% of its $104B portfolio in Q2 2021.
- Simplex Trading opened 2,250 new positions and closed 1,197 in Q2 2021.
- Simplex Trading's portfolio value rose 86% quarter-over-quarter to $104B.
Based on Simplex Trading's 13F filing for Q2 2021, filed 12 Aug 2021.