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 | |
|---|---|---|---|---|---|---|
7351
PUT
Altisource Portfolio Solutions
ASPS
$58.4M
| $63K | ﹤0.01% |
888
+887
| +88,700% | +$51.4K |
|
7352
PUT
Compass Diversified
CODI
$752M
| $63K | ﹤0.01% |
2,500
+2,445
| +4,445% | +$61.8K |
|
7353
CALL
Donaldson
DCI
$10.7B
| $63K | ﹤0.01% |
1,000
+932
| +1,371% | +$57.6K |
|
7354
Equity Lifestyle Properties
ELS
$13.1B
| $63K | ﹤0.01% |
854
-816
| -49% | -$57.7K |
|
7355
CALL
Entera Bio
ENTX
$148M
| $63K | ﹤0.01% |
+10,600
| New | +$39.2K |
|
7356
CALL
Four Corners Property Trust
FCPT
$2.89B
| $63K | ﹤0.01% |
2,300
+2,269
| +7,319% | +$64.1K |
|
7357
GSK
GSK
$107B
| $63K | ﹤0.01% |
1,266
-55,730
| -98% | -$2.68M |
|
7358
iShares Global Energy ETF
IXC
$2.75B
| $63K | ﹤0.01% |
2,389
+2,089
| +696% | +$54.3K |
|
7359
PUT
MeiraGTx Holdings
MGTX
$1.08B
| $63K | ﹤0.01% |
4,100
+4,089
| +37,173% | +$58.4K |
|
|
MSB
7360
Mesabi Trust
MSB
$296M
| $63K | ﹤0.01% |
1,791
-6,427
| -78% | -$232K |
|
|
MVO
7361
CALL
DELISTED
MV Oil Trust
MVO
| $63K | ﹤0.01% |
7,500
+7,422
| +9,515% | +$45.1K |
|
7362
CALL
Newmark Group
NMRK
$2.64B
| $63K | ﹤0.01% |
5,300
+4,540
| +597% | +$54.4K |
|
7363
PUT
NatWest
NWG
$69.9B
| $63K | ﹤0.01% |
10,493
+10,226
| +3,830% | +$61.8K |
|
7364
CALL
Patria Investments
PAX
$1.72B
| $63K | ﹤0.01% |
3,600
+3,599
| +359,900% | +$57.4K |
|
7365
Super League Enterprise
SLE
$4.44M
| $63K | ﹤0.01% |
+1
| New | +$51.3K |
|
7366
CALL
Viavi Solutions
VIAV
$7.95B
| $63K | ﹤0.01% |
3,600
+3,497
| +3,395% | +$59K |
|
|
BKI
7367
DELISTED
Black Knight, Inc. Common Stock
BKI
| $63K | ﹤0.01% |
819
-806
| -50% | -$59.6K |
|
|
IVC
7368
CALL
DELISTED
Invacare Corporation
IVC
| $63K | ﹤0.01% |
7,900
+7,728
| +4,493% | +$64.4K |
|
|
ECOM
7369
PUT
DELISTED
CHANNELADVISOR CORPORATION
ECOM
| $63K | ﹤0.01% |
2,600
+2,552
| +5,317% | +$61.3K |
|
|
HR
7370
PUT
DELISTED
Healthcare Realty Trust Incorporated
HR
| $63K | ﹤0.01% |
2,100
+2,093
| +29,900% | +$65.2K |
|
|
CIO
7371
CALL
DELISTED
City Office REIT
CIO
| $62K | ﹤0.01% |
5,000
+4,950
| +9,900% | +$57.3K |
|
7372
Foster
FSTR
$421M
| $62K | ﹤0.01% |
3,330
+219
| +7% | +$3.85K |
|
7373
CALL
Future FinTech Group
FTFT
$1.74M
| $62K | ﹤0.01% |
25
+24
| +2,400% | +$68.7K |
|
7374
Geospace Technologies
GEOS
$84M
| $62K | ﹤0.01% |
7,751
-755
| -9% | -$6.21K |
|
|
HOFV
7375
PUT
DELISTED
Hall of Fame Resort & Entertainment Co
HOFV
| $62K | ﹤0.01% |
+718
| New | +$62.1K |
|
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.