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 | |
|---|---|---|---|---|---|---|
|
SHYF
8001
PUT
DELISTED
The Shyft Group
SHYF
| $37K | ﹤0.01% |
1,000
+883
| +755% | +$33.3K |
|
|
UMH
8002
PUT
UMH Properties
UMH
$1.34B
| $37K | ﹤0.01% |
1,700
+1,554
| +1,064% | +$33.1K |
|
8003
Veracyte
VCYT
$4.44B
| $37K | ﹤0.01% |
939
-4,751
| -83% | -$203K |
|
|
XNET
8004
Xunlei
XNET
$334M
| $37K | ﹤0.01% |
8,285
-73,637
| -90% | -$376K |
|
|
ONIT
8005
CALL
Onity Group
ONIT
$341M
| $37K | ﹤0.01% |
1,200
+1,193
| +17,043% | +$36.3K |
|
|
NARI
8006
PUT
DELISTED
Inari Medical, Inc. Common Stock
NARI
| $37K | ﹤0.01% |
400
+398
| +19,900% | +$38.6K |
|
|
HOLI
8007
PUT
DELISTED
Hollsys Automation Technologies INTERNATIONAL, LTD. COMMON (British Virgin Island)
HOLI
| $37K | ﹤0.01% |
2,500
+2,484
| +15,525% | +$33.5K |
|
|
KBAL
8008
DELISTED
Kimball International
KBAL
| $37K | ﹤0.01% |
2,838
+1,706
| +151% | +$23.2K |
|
|
ASAP
8009
DELISTED
Waitr Holdings Inc. Common Stock
ASAP
| $37K | ﹤0.01% |
+1,066
| New | +$48.3K |
|
|
PBCT
8010
PUT
DELISTED
People's United Financial Inc
PBCT
| $37K | ﹤0.01% |
2,200
+2,112
| +2,400% | +$38.6K |
|
8011
CALL
AnaptysBio
ANAB
$1.54B
| $36K | ﹤0.01% |
1,400
+1,372
| +4,900% | +$32.9K |
|
8012
ATN International
ATNI
$370M
| $36K | ﹤0.01% |
+800
| New | +$38.1K |
|
8013
AudioCodes
AUDC
$249M
| $36K | ﹤0.01% |
1,103
-39,303
| -97% | -$1.26M |
|
8014
PUT
American Vanguard Corp
AVD
$74.1M
| $36K | ﹤0.01% |
2,100
+2,079
| +9,900% | +$39.5K |
|
|
CKPT
8015
DELISTED
Checkpoint Therapeutics
CKPT
| $36K | ﹤0.01% |
1,246
+1,036
| +493% | +$28.7K |
|
8016
PUT
Celestica
CLS
$40.3B
| $36K | ﹤0.01% |
4,700
+4,678
| +21,264% | +$39K |
|
|
CMCM
8017
CALL
Cheetah Mobile
CMCM
$90.6M
| $36K | ﹤0.01% |
+3,120
| New | +$35K |
|
8018
PUT
Precision BioSciences
DTIL
$185M
| $36K | ﹤0.01% |
97
+92
| +1,840% | +$27.6K |
|
8019
CALL
Emcor
EME
$31.4B
| $36K | ﹤0.01% |
300
+298
| +14,900% | +$36.4K |
|
8020
1-800-Flowers.com
FLWS
$254M
| $36K | ﹤0.01% |
1,144
-10,326
| -90% | -$322K |
|
8021
Fuel Tech
FTEK
$45.2M
| $36K | ﹤0.01% |
15,415
+4,380
| +40% | +$10.2K |
|
8022
PUT
CGI
GIB
$15B
| $36K | ﹤0.01% |
400
+399
| +39,900% | +$35.4K |
|
8023
CALL
Global Industrial
GIC
$1.39B
| $36K | ﹤0.01% |
+1,000
| New | +$38K |
|
8024
Galmed Pharmaceuticals
GLMD
$4.41M
| $36K | ﹤0.01% |
+67
| New | +$36.4K |
|
8025
PUT
Gold Royalty Corp
GROY
$598M
| $36K | ﹤0.01% |
+6,900
| New | +$33.7K |
|
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.