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 | |
|---|---|---|---|---|---|---|
8276
CALL
Cadiz
CDZI
$259M
| $28K | ﹤0.01% |
2,100
+2,060
| +5,150% | +$24.7K |
|
8277
Coherus Oncology
CHRS
$225M
| $28K | ﹤0.01% |
2,088
-6,680
| -76% | -$94.6K |
|
|
DHC
8278
CALL
Diversified Healthcare Trust
DHC
$2.28B
| $28K | ﹤0.01% |
6,700
+6,584
| +5,676% | +$27.2K |
|
8279
CALL
Duluth Holdings
DLTH
$162M
| $28K | ﹤0.01% |
1,400
+1,291
| +1,184% | +$21.3K |
|
8280
PUT
Evolution Petroleum
EPM
$129M
| $28K | ﹤0.01% |
5,800
+5,768
| +18,025% | +$22.7K |
|
8281
CALL
Grid Dynamics Holdings
GDYN
$514M
| $28K | ﹤0.01% |
1,900
+1,898
| +94,900% | +$29.7K |
|
8282
KKR & Co
KKR
$91.3B
| $28K | ﹤0.01% |
488
-5,302
| -92% | -$294K |
|
8283
Liquidia Corp
LQDA
$7.51B
| $28K | ﹤0.01% |
+9,836
| New | +$27.2K |
|
8284
PUT
Oil States International
OIS
$512M
| $28K | ﹤0.01% |
+3,600
| New | +$24.1K |
|
8285
Prothena Corp
PRTA
$455M
| $28K | ﹤0.01% |
562
-8,175
| -94% | -$255K |
|
8286
PUT
Resources Connection
RGP
$133M
| $28K | ﹤0.01% |
2,000
+1,939
| +3,179% | +$28K |
|
8287
CALL
Spire
SR
$4.87B
| $28K | ﹤0.01% |
400
+386
| +2,757% | +$28.7K |
|
8288
PUT
Titan International
TWI
$519M
| $28K | ﹤0.01% |
3,400
+2,979
| +708% | +$29K |
|
8289
Vanguard Consumer Staples ETF
VDC
$7.98B
| $28K | ﹤0.01% |
+155
| New | +$28.3K |
|
8290
PUT
Wipro
WIT
$18.9B
| $28K | ﹤0.01% |
7,200
+7,124
| +9,374% | +$26.6K |
|
|
B
8291
DELISTED
Barnes Group Inc.
B
| $28K | ﹤0.01% |
+556
| New | +$28.8K |
|
|
GLOP
8292
CALL
DELISTED
GASLOG PARTNERS LP
GLOP
| $28K | ﹤0.01% |
7,600
+7,313
| +2,548% | +$22.1K |
|
|
OTIC
8293
DELISTED
Otonomy, Inc.
OTIC
| $28K | ﹤0.01% |
12,646
-77,779
| -86% | -$180K |
|
|
TMX
8294
CALL
DELISTED
Terminix Global Holdings, Inc.
TMX
| $28K | ﹤0.01% |
600
+570
| +1,900% | +$28K |
|
|
ACH
8295
CALL
DELISTED
Alum Corp of China Ltd
ACH
| $28K | ﹤0.01% |
1,900
+1,746
| +1,134% | +$23.6K |
|
|
HRC
8296
DELISTED
HILL-ROM HOLDINGS, INC.
HRC
| $28K | ﹤0.01% |
255
+29
| +13% | +$3.25K |
|
|
MACK
8297
CALL
DELISTED
Merrimack Pharmaceuticals, Inc.
MACK
| $28K | ﹤0.01% |
4,400
+4,176
| +1,864% | +$27.6K |
|
8298
CALL
Allegion
ALLE
$13.4B
| $27K | ﹤0.01% |
200
+198
| +9,900% | +$27.1K |
|
8299
PUT
Arcutis Biotherapeutics
ARQT
$3.48B
| $27K | ﹤0.01% |
1,000
+991
| +11,011% | +$27.9K |
|
8300
JPMorgan BetaBuilders Canada ETF
BBCA
$10.9B
| $27K | ﹤0.01% |
+420
| New | +$26.7K |
|
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.