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 | |
|---|---|---|---|---|---|---|
|
UMPQ
7926
PUT
DELISTED
Umpqua Holdings Corp
UMPQ
| $40K | ﹤0.01% |
2,200
+2,039
| +1,266% | +$37.9K |
|
7927
Adtran
ADTN
$730M
| $39K | ﹤0.01% |
+1,902
| New | +$36.8K |
|
7928
PUT
Airgain
AIRG
$71.9M
| $39K | ﹤0.01% |
1,900
+1,876
| +7,817% | +$38.6K |
|
|
AKRO
7929
CALL
DELISTED
Akero Therapeutics
AKRO
| $39K | ﹤0.01% |
1,600
+1,571
| +5,417% | +$44.1K |
|
7930
PUT
Aware
AWRE
$24.2M
| $39K | ﹤0.01% |
10,700
+10,571
| +8,195% | +$38.9K |
|
7931
PUT
Black Hills Corp
BKH
$5.69B
| $39K | ﹤0.01% |
600
+583
| +3,429% | +$39.6K |
|
7932
CytomX Therapeutics
CTMX
$701M
| $39K | ﹤0.01% |
+6,168
| New | +$48K |
|
7933
PUT
DXP Enterprises
DXPE
$2.49B
| $39K | ﹤0.01% |
1,200
+1,199
| +119,900% | +$37K |
|
|
FARM
7934
CALL
DELISTED
Farmer Brothers
FARM
| $39K | ﹤0.01% |
+3,100
| New | +$33.8K |
|
7935
CALL
Five Point Holdings
FPH
$395M
| $39K | ﹤0.01% |
4,900
+4,858
| +11,567% | +$36.8K |
|
7936
PUT
Flotek Industries
FTK
$856M
| $39K | ﹤0.01% |
3,817
+3,807
| +38,070% | +$41K |
|
|
HEPA
7937
PUT
DELISTED
Hepion Pharmaceuticals
HEPA
| $39K | ﹤0.01% |
+20
| New | +$36.6K |
|
7938
CALL
HNI Corp
HNI
$3.17B
| $39K | ﹤0.01% |
900
+899
| +89,900% | +$39K |
|
|
KW
7939
PUT
DELISTED
Kennedy-Wilson Holdings
KW
| $39K | ﹤0.01% |
2,000
+1,995
| +39,900% | +$40.3K |
|
7940
PUT
Kayne Anderson Energy Infrastructure Fund
KYN
$2.43B
| $39K | ﹤0.01% |
4,400
+4,355
| +9,678% | +$34.9K |
|
7941
CALL
New Jersey Resources
NJR
$6.04B
| $39K | ﹤0.01% |
1,000
+992
| +12,400% | +$41.9K |
|
7942
CALL
Ooma
OOMA
$608M
| $39K | ﹤0.01% |
2,100
+2,087
| +16,054% | +$37.8K |
|
7943
PUT
PennantPark Floating Rate Capital
PFLT
$705M
| $39K | ﹤0.01% |
3,100
+3,094
| +51,567% | +$39.1K |
|
7944
PUT
Cartesian Therapeutics
RNAC
$225M
| $39K | ﹤0.01% |
317
+313
| +7,825% | +$37.3K |
|
7945
Rackspace Technology
RXT
$967M
| $39K | ﹤0.01% |
2,008
-1,674
| -45% | -$37.1K |
|
7946
PUT
SLM Corp
SLM
$4.74B
| $39K | ﹤0.01% |
+1,900
| New | +$37.4K |
|
7947
State Street SPDR Portfolio TIPS ETF
SPIP
$1.01B
| $39K | ﹤0.01% |
+1,279
| New | +$39.5K |
|
7948
PUT
Vera Bradley
VRA
$104M
| $39K | ﹤0.01% |
3,200
+3,143
| +5,514% | +$35.9K |
|
7949
CALL
WidePoint Corp
WYY
$99.6M
| $39K | ﹤0.01% |
+5,500
| New | +$43.3K |
|
|
EQC
7950
PUT
DELISTED
Equity Commonwealth
EQC
| $39K | ﹤0.01% |
1,500
+1,280
| +582% | +$35.6K |
|
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.