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 | |
|---|---|---|---|---|---|---|
|
BERY
4101
PUT
DELISTED
Berry Global Group, Inc.
BERY
| $521K | ﹤0.01% |
8,712
+8,453
| +3,264% | +$509K |
|
|
PTRA
4102
PUT
DELISTED
Proterra Inc. Common Stock
PTRA
| $521K | ﹤0.01% |
30,500
+30,006
| +6,074% | +$504K |
|
|
VLDR
4103
DELISTED
Velodyne Lidar, Inc. Common Stock
VLDR
| $521K | ﹤0.01% |
+49,003
| New | +$579K |
|
4104
iShares US Telecommunications ETF
IYZ
$1.19B
| $520K | ﹤0.01% |
15,671
+4,239
| +37% | +$141K |
|
|
MESO
4105
PUT
Mesoblast
MESO
$1.87B
| $520K | ﹤0.01% |
34,800
+34,774
| +133,746% | +$546K |
|
4106
United Microelectronic
UMC
$43.6B
| $520K | ﹤0.01% |
55,034
-41,974
| -43% | -$393K |
|
4107
PUT
United Therapeutics
UTHR
$26.1B
| $520K | ﹤0.01% |
+2,900
| New | +$552K |
|
|
TCS
4108
PUT
DELISTED
THE CONTAINER STORE GROUP, INC.
TCS
| $520K | ﹤0.01% |
+2,660
| New | +$553K |
|
4109
CALL
Cirrus Logic
CRUS
$6.87B
| $519K | ﹤0.01% |
6,100
+5,910
| +3,111% | +$474K |
|
4110
CALL
Intellicheck
IDN
$73.7M
| $519K | ﹤0.01% |
62,100
+61,888
| +29,192% | +$508K |
|
4111
The Beachbody Company
BODI
$78.4M
| $519K | ﹤0.01% |
999
-2,406
| -71% | -$1.22M |
|
4112
PUT
Extreme Networks
EXTR
$3.92B
| $518K | ﹤0.01% |
46,500
+45,925
| +7,987% | +$487K |
|
4113
MicroSectors FANG+ ETNs due Jan 8 2038
FNGS
$543M
| $518K | ﹤0.01% |
16,267
+2,078
| +15% | +$61.3K |
|
4114
PUT
Vermilion Energy
VET
$1.59B
| $518K | ﹤0.01% |
59,300
+58,951
| +16,891% | +$461K |
|
4115
PUT
Fortune Brands Innovations
FBIN
$6.09B
| $517K | ﹤0.01% |
6,084
+6,070
| +43,357% | +$531K |
|
4116
TechnipFMC
FTI
$28.9B
| $516K | ﹤0.01% |
57,024
+21,128
| +59% | +$178K |
|
4117
PUT
AEye
LIDR
$49.6M
| $516K | ﹤0.01% |
1,717
+1,689
| +6,032% | +$507K |
|
|
MDRX
4118
CALL
DELISTED
Veradigm Inc. Common Stock
MDRX
| $516K | ﹤0.01% |
+27,900
| New | +$470K |
|
4119
PUT
Trimble
TRMB
$13.6B
| $515K | ﹤0.01% |
6,300
+6,223
| +8,082% | +$495K |
|
4120
PUT
IonQ
IONQ
$12.6B
| $514K | ﹤0.01% |
48,100
+47,786
| +15,218% | +$495K |
|
4121
Pitney Bowes
PBI
$2.41B
| $514K | ﹤0.01% |
58,715
-27,160
| -32% | -$226K |
|
|
SOS
4122
SOS Limited
SOS
$17.8M
| $514K | ﹤0.01% |
207
+172
| +491% | +$504K |
|
4123
PUT
Hain Celestial
HAIN
$44.8M
| $513K | ﹤0.01% |
12,800
+12,728
| +17,678% | +$525K |
|
4124
CALL
Build-A-Bear
BBW
$443M
| $512K | ﹤0.01% |
29,600
+29,448
| +19,374% | +$350K |
|
4125
CALL
California Resources
CRC
$4.38B
| $512K | ﹤0.01% |
17,000
+16,898
| +16,567% | +$465K |
|
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.