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 | |
|---|---|---|---|---|---|---|
8026
iShares Europe ETF
IEV
$1.64B
| $36K | ﹤0.01% |
687
-115
| -14% | -$6.17K |
|
8027
Immunic
IMUX
$182M
| $36K | ﹤0.01% |
298
-185
| -38% | -$25.6K |
|
8028
PUT
Independence Realty Trust
IRT
$3.93B
| $36K | ﹤0.01% |
2,000
+1,958
| +4,662% | +$33.2K |
|
8029
Coca-Cola Femsa
KOF
$22.8B
| $36K | ﹤0.01% |
+693
| New | +$34.1K |
|
8030
Netflix
NFLX
$301B
| $36K | ﹤0.01% |
700
| – | – |
|
8031
Nkarta
NKTX
$159M
| $36K | ﹤0.01% |
+1,166
| New | +$33.6K |
|
8032
PUT
Insperity
NSP
$2.01B
| $36K | ﹤0.01% |
400
+366
| +1,076% | +$32.7K |
|
8033
NETSCOUT
NTCT
$2.89B
| $36K | ﹤0.01% |
1,268
+811
| +177% | +$23K |
|
8034
PUT
Orthofix Medical
OFIX
$496M
| $36K | ﹤0.01% |
900
+889
| +8,082% | +$37.6K |
|
|
OGI
8035
CALL
Organigram Holdings
OGI
$134M
| $36K | ﹤0.01% |
3,150
+3,069
| +3,789% | +$34.9K |
|
8036
CALL
Onto Innovation
ONTO
$12B
| $36K | ﹤0.01% |
500
+440
| +733% | +$30.2K |
|
8037
PUT
Pacira BioSciences
PCRX
$1.05B
| $36K | ﹤0.01% |
600
+569
| +1,835% | +$36K |
|
8038
CALL
Pricesmart
PSMT
$5.9B
| $36K | ﹤0.01% |
400
+399
| +39,900% | +$35.6K |
|
|
RBOT
8039
DELISTED
Vicarious Surgical
RBOT
| $36K | ﹤0.01% |
+122
| New | +$36.3K |
|
8040
CALL
Relay Therapeutics
RLAY
$3.99B
| $36K | ﹤0.01% |
1,000
+995
| +19,900% | +$32.8K |
|
8041
PUT
Tidewater
TDW
$3.71B
| $36K | ﹤0.01% |
3,000
+2,885
| +2,509% | +$38.3K |
|
8042
PUT
Interface
TILE
$2B
| $36K | ﹤0.01% |
2,400
+2,318
| +2,827% | +$33.4K |
|
|
TMQ
8043
Trilogy Metals
TMQ
$517M
| $36K | ﹤0.01% |
14,464
+4,065
| +39% | +$10.2K |
|
8044
CALL
Tetra Tech
TTEK
$8.7B
| $36K | ﹤0.01% |
1,500
+1,495
| +29,900% | +$37.6K |
|
|
AD
8045
CALL
Array Digital Infrastructure
AD
$3.03B
| $36K | ﹤0.01% |
1,000
+991
| +11,011% | +$36.8K |
|
8046
CALL
VEON
VEON
$3.57B
| $36K | ﹤0.01% |
804
+740
| +1,156% | +$32.7K |
|
8047
CALL
Voyager Therapeutics
VYGR
$184M
| $36K | ﹤0.01% |
8,800
+8,750
| +17,500% | +$39.7K |
|
8048
Expro Ltd
XPRO
$1.75B
| $36K | ﹤0.01% |
+2,028
| New | +$41.9K |
|
|
CSCI
8049
PUT
DELISTED
COSCIENS Biopharma Inc. Common Stock
CSCI
| $36K | ﹤0.01% |
420
+417
| +13,900% | +$39.7K |
|
|
ALTR
8050
DELISTED
Altair Engineering Inc
ALTR
| $36K | ﹤0.01% |
535
+37
| +7% | +$2.43K |
|
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.