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 | |
|---|---|---|---|---|---|---|
8701
CALL
CVR Energy
CVI
$3.36B
| $17K | ﹤0.01% |
2,900
+2,857
| +6,644% | +$59K |
|
8702
Donegal Group Class A
DGICA
$695M
| $17K | ﹤0.01% |
1,213
+319
| +36% | +$4.88K |
|
8703
PUT
The Ensign Group
ENSG
$10.1B
| $17K | ﹤0.01% |
200
+179
| +852% | +$15.5K |
|
8704
Comfort Systems
FIX
$61B
| $17K | ﹤0.01% |
223
-1,254
| -85% | -$102K |
|
8705
PUT
Fuel Tech
FTEK
$48.2M
| $17K | ﹤0.01% |
7,500
+7,243
| +2,818% | +$16.8K |
|
8706
CALL
Griffon
GFF
$4.16B
| $17K | ﹤0.01% |
700
+669
| +2,158% | +$17.9K |
|
|
HDSN
8707
PUT
Hudson Technologies
HDSN
$267M
| $17K | ﹤0.01% |
5,100
+5,049
| +9,900% | +$12.2K |
|
8708
PUT
Hess Midstream
HESM
$5.22B
| $17K | ﹤0.01% |
700
+575
| +460% | +$13.9K |
|
|
JFIN
8709
PUT
Jiayin Group
JFIN
$113M
| $17K | ﹤0.01% |
+3,400
| New | +$20.9K |
|
8710
Kayne Anderson Energy Infrastructure Fund
KYN
$2.52B
| $17K | ﹤0.01% |
1,922
-5,780
| -75% | -$46.4K |
|
8711
CALL
Grand Canyon Education
LOPE
$3.71B
| $17K | ﹤0.01% |
200
+188
| +1,567% | +$18.6K |
|
8712
CALL
Medallion Financial
MFIN
$226M
| $17K | ﹤0.01% |
2,000
+1,668
| +502% | +$14.4K |
|
8713
CALL
NETSCOUT
NTCT
$2.86B
| $17K | ﹤0.01% |
600
+582
| +3,233% | +$16.5K |
|
8714
Nuvation Bio
NUVB
$2.24B
| $17K | ﹤0.01% |
+1,827
| New | +$20.8K |
|
|
NVEE
8715
DELISTED
NV5 Global
NVEE
| $17K | ﹤0.01% |
756
-1,120
| -60% | -$25.5K |
|
8716
PUT
Ocean Power Technologies
OPTT
$38.3M
| $17K | ﹤0.01% |
7,100
+6,811
| +2,357% | +$16.9K |
|
8717
Park Aerospace
PKE
$745M
| $17K | ﹤0.01% |
1,141
-150
| -12% | -$2.16K |
|
8718
CALL
Sonic Automotive
SAH
$3.15B
| $17K | ﹤0.01% |
+400
| New | +$19.4K |
|
|
SCHV
8719
Schwab US Large-Cap Value ETF
SCHV
$15.8B
| $17K | ﹤0.01% |
771
-4,089
| -84% | -$92.8K |
|
8720
PUT
Singularity Future Technology
SGLY
$241K
| $17K | ﹤0.01% |
+39
| New | +$22.6K |
|
8721
PUT
Stewart Information Services
STC
$2.05B
| $17K | ﹤0.01% |
300
+297
| +9,900% | +$17.3K |
|
8722
CALL
StepStone Group
STEP
$3.48B
| $17K | ﹤0.01% |
500
+486
| +3,471% | +$16.2K |
|
8723
Team
TISI
$77.7M
| $17K | ﹤0.01% |
268
-7,223
| -96% | -$657K |
|
|
TOUR
8724
PUT
Tuniu
TOUR
$55.4M
| $17K | ﹤0.01% |
730
+711
| +3,742% | +$19.4K |
|
8725
CALL
TTM Technologies
TTMI
$13.6B
| $17K | ﹤0.01% |
1,200
+957
| +394% | +$14.3K |
|
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.