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 | |
|---|---|---|---|---|---|---|
8526
Ceco Environmental
CECO
$4.18B
| $21K | ﹤0.01% |
+2,938
| New | +$22.7K |
|
|
DESP
8527
PUT
DELISTED
Despegar.com
DESP
| $21K | ﹤0.01% |
1,600
+1,551
| +3,165% | +$20.9K |
|
|
DRRX
8528
PUT
DELISTED
DURECT Corp
DRRX
| $21K | ﹤0.01% |
1,340
+1,321
| +6,953% | +$23K |
|
8529
CALL
Driven Brands
DRVN
$2.34B
| $21K | ﹤0.01% |
700
+680
| +3,400% | +$19.2K |
|
|
8530
PUT
Driven Brands
DRVN
$2.34B
| $21K | ﹤0.01% |
700
+683
| +4,018% | +$19.2K |
|
8531
PUT
DoubleVerify
DV
$1.7B
| $21K | ﹤0.01% |
+500
| New | +$17.8K |
|
8532
PUT
Ecopetrol
EC
$32.7B
| $21K | ﹤0.01% |
1,500
+408
| +37% | +$5.2K |
|
|
ELP
8533
CALL
DELISTED
Companhia Paranaense de Energia (COPEL)
ELP
| $21K | ﹤0.01% |
4,625
+4,620
| +92,400% | +$21.2K |
|
8534
PUT
Fortress Biotech
FBIO
$108M
| $21K | ﹤0.01% |
+400
| New | +$24.1K |
|
8535
Funko
FNKO
$341M
| $21K | ﹤0.01% |
+1,000
| New | +$22.8K |
|
8536
CALL
Gaia
GAIA
$48.4M
| $21K | ﹤0.01% |
2,000
+1,998
| +99,900% | +$22.7K |
|
8537
PUT
Globus Maritime Ltd
GLBS
$63.2M
| $21K | ﹤0.01% |
+5,500
| New | +$25K |
|
8538
Quadratic Interest Rate Volatility and Inflation Hedge ETF
IVOL
$271M
| $21K | ﹤0.01% |
776
-38,461
| -98% | -$1.09M |
|
8539
CALL
Liberty Energy
LBRT
$2.82B
| $21K | ﹤0.01% |
1,500
+1,491
| +16,567% | +$20.1K |
|
8540
LifeVantage
LFVN
$79.6M
| $21K | ﹤0.01% |
2,887
+2,871
| +17,944% | +$23.4K |
|
|
LGHL
8541
PUT
Lion Group Holding
LGHL
$1.07M
| – | – |
0
| – | – |
|
8542
CALL
Malibu Boats
MBUU
$552M
| $21K | ﹤0.01% |
300
+242
| +417% | +$19.3K |
|
|
ONT
8543
CALL
Onterris Inc
ONT
$718M
| $21K | ﹤0.01% |
400
+390
| +3,900% | +$20.5K |
|
8544
Mitsubishi UFJ Financial
MUFG
$259B
| $21K | ﹤0.01% |
3,900
-10,682
| -73% | -$59.4K |
|
8545
Nautilus Biotechnolgy
NAUT
$212M
| $21K | ﹤0.01% |
+2,140
| New | +$23.2K |
|
8546
O-I Glass
OI
$1.43B
| $21K | ﹤0.01% |
1,332
-16,341
| -92% | -$277K |
|
|
OPRA
8547
Opera Ltd
OPRA
$1.7B
| $21K | ﹤0.01% |
2,081
-4,328
| -68% | -$45.9K |
|
|
PBPB
8548
CALL
DELISTED
Potbelly
PBPB
| $21K | ﹤0.01% |
2,700
+2,463
| +1,039% | +$17.3K |
|
|
AIXC
8549
PUT
AIxCrypto Holdings Inc
AIXC
$16.9M
| $21K | ﹤0.01% |
22
+20
| +1,000% | +$20.3K |
|
8550
RCM Technologies
RCMT
$198M
| $21K | ﹤0.01% |
5,259
-190
| -3% | -$698 |
|
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.