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 | |
|---|---|---|---|---|---|---|
6426
Comstock Resources
CRK
$3.89B
| $123K | ﹤0.01% |
18,590
+6,094
| +49% | +$35.1K |
|
6427
Ituran Location and Control
ITRN
$1.09B
| $123K | ﹤0.01% |
4,552
+3,062
| +206% | +$72.8K |
|
6428
PUT
IZEA Worldwide
IZEA
$60.6M
| $123K | ﹤0.01% |
12,150
+12,055
| +12,689% | +$158K |
|
|
LPRO
6429
Open Lending Corp
LPRO
| $123K | ﹤0.01% |
+2,859
| New | +$110K |
|
6430
Modine Manufacturing
MOD
$10.7B
| $123K | ﹤0.01% |
7,433
+3,093
| +71% | +$50.6K |
|
6431
Motorola Solutions
MSI
$72.3B
| $123K | ﹤0.01% |
+571
| New | +$114K |
|
6432
CALL
Retractable Technologies
RVP
$19.8M
| $123K | ﹤0.01% |
10,700
+9,920
| +1,272% | +$104K |
|
6433
CALL
Steris
STE
$22.3B
| $123K | ﹤0.01% |
600
+522
| +669% | +$105K |
|
|
YSG
6434
Yatsen Holding
YSG
$322M
| $123K | ﹤0.01% |
2,628
-4,503
| -63% | -$233K |
|
|
EIGR
6435
PUT
DELISTED
Eiger BioPharmaceuticals, Inc.
EIGR
| $123K | ﹤0.01% |
483
+481
| +24,050% | +$120K |
|
|
CPUH
6436
CALL
DELISTED
Compute Health Acquisition Corp.
CPUH
| $123K | ﹤0.01% |
+12,600
| New | +$124K |
|
|
BSMX
6437
PUT
DELISTED
Banco Santander México, S, A., Institución de Banca Múltiple, Grupo Financiero Santander México
BSMX
| $123K | ﹤0.01% |
19,700
+19,523
| +11,030% | +$115K |
|
6438
CALL
DNOW Inc
DNOW
$2.58B
| $122K | ﹤0.01% |
12,900
+12,667
| +5,436% | +$131K |
|
6439
Flowserve
FLS
$9.71B
| $122K | ﹤0.01% |
3,031
-1,800
| -37% | -$74.4K |
|
6440
Liberty Energy
LBRT
$3.05B
| $122K | ﹤0.01% |
8,676
-13,014
| -60% | -$176K |
|
|
MREO
6441
PUT
Mereo BioPharma
MREO
$54.7M
| $122K | ﹤0.01% |
38,600
+38,045
| +6,855% | +$128K |
|
|
NVEE
6442
PUT
DELISTED
NV5 Global
NVEE
| $122K | ﹤0.01% |
5,200
+5,092
| +4,715% | +$116K |
|
6443
CALL
Organogenesis Holdings
ORGO
$305M
| $122K | ﹤0.01% |
7,400
+7,395
| +147,900% | +$138K |
|
6444
PUT
WPP
WPP
$4.36B
| $122K | ﹤0.01% |
1,800
+1,770
| +5,900% | +$121K |
|
|
APEN
6445
CALL
DELISTED
Apollo Endosurgery, Inc.
APEN
| $122K | ﹤0.01% |
15,100
+15,083
| +88,724% | +$103K |
|
|
HAAC
6446
DELISTED
Health Assurance Acquisition Corp. Class A Common Stock
HAAC
| $122K | ﹤0.01% |
12,264
-87,608
| -88% | -$894K |
|
|
FBC
6447
PUT
DELISTED
Flagstar Bancorp, Inc. New
FBC
| $122K | ﹤0.01% |
2,900
+2,874
| +11,054% | +$130K |
|
6448
Badger Meter
BMI
$3.89B
| $121K | ﹤0.01% |
1,234
-201
| -14% | -$19K |
|
6449
Cullen/Frost Bankers
CFR
$10.3B
| $121K | ﹤0.01% |
1,084
-8,915
| -89% | -$1.04M |
|
6450
CALL
China Yuchai International
CYD
$1.77B
| $121K | ﹤0.01% |
7,600
+7,546
| +13,974% | +$122K |
|
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.