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 | |
|---|---|---|---|---|---|---|
9351
Dana Inc
DAN
$2.91B
| $6K | ﹤0.01% |
258
-3,313
| -93% | -$85.9K |
|
9352
CALL
DHI Group
DHX
$166M
| $6K | ﹤0.01% |
1,900
+1,885
| +12,567% | +$5.97K |
|
9353
PUT
Dynagas LNG Partners
DLNG
$131M
| $6K | ﹤0.01% |
2,100
+2,008
| +2,183% | +$5.72K |
|
9354
CALL
DXP Enterprises
DXPE
$2.62B
| $6K | ﹤0.01% |
200
+139
| +228% | +$4.29K |
|
9355
iShares MSCI Emerging Markets Min Vol Factor ETF
EEMV
$3.45B
| $6K | ﹤0.01% |
95
+21
| +28% | +$1.34K |
|
9356
Emcor
EME
$33.1B
| $6K | ﹤0.01% |
52
-200
| -79% | -$24.4K |
|
9357
Direxion Daily Energy Bear 2X ETF
ERY
$37.5M
| $6K | ﹤0.01% |
+49
| New | +$7.83K |
|
9358
CALL
First Trust Global Wind Energy ETF
FAN
$281M
| $6K | ﹤0.01% |
290
+240
| +480% | +$5.23K |
|
9359
PUT
Fidus Investment
FDUS
$737M
| $6K | ﹤0.01% |
400
+353
| +751% | +$6K |
|
9360
Goldman Sachs Innovate Equity ETF
GINN
$199M
| $6K | ﹤0.01% |
101
+100
| +10,000% | +$5.94K |
|
9361
PUT
Genie Energy
GNE
$378M
| $6K | ﹤0.01% |
1,000
+990
| +9,900% | +$6.07K |
|
9362
PUT
Good Times Restaurants
GTIM
$14.7M
| $6K | ﹤0.01% |
1,600
+1,524
| +2,005% | +$6.61K |
|
9363
Hope Bancorp
HOPE
$1.72B
| $6K | ﹤0.01% |
429
+80
| +23% | +$1.21K |
|
|
HTBK
9364
PUT
DELISTED
Heritage Commerce
HTBK
| $6K | ﹤0.01% |
+600
| New | +$7.13K |
|
9365
CALL
Heartland Express
HTLD
$1.11B
| $6K | ﹤0.01% |
400
+354
| +770% | +$6.54K |
|
9366
IGC Pharma
IGC
$27.6M
| $6K | ﹤0.01% |
3,703
-83,113
| -96% | -$127K |
|
9367
Disc Medicine
IRON
$2.83B
| $6K | ﹤0.01% |
35
-1,639
| -98% | -$539K |
|
9368
CALL
Kforce
KFRC
$983M
| $6K | ﹤0.01% |
100
+96
| +2,400% | +$5.68K |
|
9369
Kodiak Sciences
KOD
$2.59B
| $6K | ﹤0.01% |
70
-25
| -26% | -$2.4K |
|
9370
CALL
Krystal Biotech
KRYS
$9.88B
| $6K | ﹤0.01% |
100
+69
| +223% | +$4.82K |
|
9371
PUT
KVH Industries
KVHI
$177M
| $6K | ﹤0.01% |
500
+495
| +9,900% | +$6.69K |
|
9372
Lifecore Biomedical
LFCR
$162M
| $6K | ﹤0.01% |
+619
| New | +$7.13K |
|
9373
Lakeland Financial Corp
LKFN
$1.52B
| $6K | ﹤0.01% |
111
-100
| -47% | -$6.4K |
|
9374
CALL
LeMaitre Vascular
LMAT
$2.18B
| $6K | ﹤0.01% |
100
+99
| +9,900% | +$5.26K |
|
9375
CALL
Monarch Casino & Resort
MCRI
$2.14B
| $6K | ﹤0.01% |
100
+97
| +3,233% | +$6.7K |
|
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.