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 | |
|---|---|---|---|---|---|---|
6226
CALL
Schneider National
SNDR
$6.26B
| $141K | ﹤0.01% |
6,500
+6,431
| +9,320% | +$156K |
|
6227
CALL
Universal Insurance Holdings
UVE
$1.22B
| $141K | ﹤0.01% |
10,200
+10,124
| +13,321% | +$142K |
|
|
ACOR
6228
CALL
DELISTED
Acorda Therapeutics
ACOR
| $141K | ﹤0.01% |
1,530
+1,492
| +3,926% | +$130K |
|
|
CSOD
6229
DELISTED
Cornerstone OnDemand, Inc.
CSOD
| $141K | ﹤0.01% |
2,744
+1,517
| +124% | +$70.3K |
|
|
AHRT
6230
PUT
AH Realty Trust
AHRT
$529M
| $140K | ﹤0.01% |
10,600
+10,196
| +2,524% | +$137K |
|
6231
CALL
International Seaways
INSW
$4.76B
| $140K | ﹤0.01% |
7,300
+7,282
| +40,456% | +$142K |
|
6232
PUT
Innoviva
INVA
$1.55B
| $140K | ﹤0.01% |
10,500
+10,466
| +30,782% | +$131K |
|
6233
CALL
Laureate Education
LAUR
$5.28B
| $140K | ﹤0.01% |
9,700
+9,401
| +3,144% | +$133K |
|
6234
CALL
Lear
LEA
$6.54B
| $140K | ﹤0.01% |
800
+756
| +1,718% | +$140K |
|
|
OPI
6235
CALL
DELISTED
Office Properties Income Trust
OPI
| $140K | ﹤0.01% |
4,800
+4,369
| +1,014% | +$125K |
|
6236
PUT
PROG Holdings
PRG
$1.75B
| $140K | ﹤0.01% |
3,200
+3,112
| +3,536% | +$155K |
|
6237
CALL
Rogers Corp
ROG
$2.21B
| $140K | ﹤0.01% |
700
+698
| +34,900% | +$133K |
|
|
VOXX
6238
CALL
DELISTED
VOXX International Corporation Class A
VOXX
| $140K | ﹤0.01% |
10,000
+9,947
| +18,768% | +$161K |
|
6239
Alpha and Omega Semiconductor
AOSL
$950M
| $139K | ﹤0.01% |
4,598
+3,137
| +215% | +$96.4K |
|
6240
PUT
Ares Management
ARES
$28.9B
| $139K | ﹤0.01% |
2,200
+2,189
| +19,900% | +$122K |
|
6241
Fomento Económico Mexicano
FMX
$43.6B
| $139K | ﹤0.01% |
+1,649
| New | +$135K |
|
6242
PUT
Gladstone Investment Corp
GAIN
$643M
| $139K | ﹤0.01% |
9,700
+9,651
| +19,696% | +$135K |
|
6243
CALL
Galectin Therapeutics
GALT
$196M
| $139K | ﹤0.01% |
43,700
+43,417
| +15,342% | +$155K |
|
|
GAN
6244
DELISTED
GAN Ltd
GAN
| $139K | ﹤0.01% |
+8,489
| New | +$150K |
|
6245
Global X Video Games & Esports ETF
HERO
$64.5M
| $139K | ﹤0.01% |
4,318
+1,092
| +34% | +$35K |
|
6246
iShares US Broker-Dealers & Securities Exchanges ETF
IAI
$1.36B
| $139K | ﹤0.01% |
+1,366
| New | +$135K |
|
6247
CALL
Kodiak Sciences
KOD
$2.6B
| $139K | ﹤0.01% |
1,500
+1,478
| +6,718% | +$142K |
|
6248
PUT
Koppers
KOP
$943M
| $139K | ﹤0.01% |
4,300
+4,268
| +13,338% | +$144K |
|
6249
Kura Oncology
KURA
$800M
| $139K | ﹤0.01% |
6,667
+3,969
| +147% | +$98.5K |
|
|
TGI
6250
PUT
DELISTED
Triumph Group
TGI
| $139K | ﹤0.01% |
6,700
+6,632
| +9,753% | +$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.