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 |
iShares Russell 2000 ETF
IWM
|
+$146M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$108M |
| 3 |
Apple
AAPL
|
+$62.9M |
| 4 |
Tesla
TSLA
|
+$51.9M |
| 5 |
Micron Technology
MU
|
+$39.5M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$108M |
| 2 |
Meta Platforms (Facebook)
META
|
+$104M |
| 3 |
Advanced Micro Devices
AMD
|
+$92.1M |
| 4 |
Amazon
AMZN
|
+$90.3M |
| 5 |
TSMC
TSM
|
+$82.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.28% |
| 2 | Technology | 0.76% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Communication Services | 0.19% |
| 5 | Healthcare | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
CEPU
4176
PUT
Central Puerto
CEPU
$1.81B
| $312K | ﹤0.01% |
+21,000
| New | +$317K |
|
4177
PUT
ChargePoint
CHPT
$238M
| $312K | ﹤0.01% |
52,800
-16,600
| -24% | -$109K |
|
4178
PUT
Oceaneering
OII
$4.49B
| $312K | ﹤0.01% |
7,700
+4,500
| +141% | +$170K |
|
|
TGR
4179
CALL
DELISTED
ISHARES TARGET DATE RETIREMENT INCOME ETF
TGR
| $312K | ﹤0.01% |
8,900
+3,200
| +56% | +$112K |
|
4180
PUT
Weibo
WB
$1.57B
| $311K | ﹤0.01% |
42,900
-8,400
| -16% | -$68.6K |
|
|
CHYM
4181
PUT
Chime Financial
CHYM
$9.95B
| $311K | ﹤0.01% |
15,200
+9,400
| +162% | +$182K |
|
4182
GoPro
GPRO
$272M
| $311K | ﹤0.01% |
400,088
-3,995
| -1% | -$4.22K |
|
|
ESPR
4183
CALL
DELISTED
Esperion Therapeutics
ESPR
| $311K | ﹤0.01% |
98,500
-194,200
| -66% | -$543K |
|
4184
PUT
Sunoco
SUN
$13.8B
| $311K | ﹤0.01% |
4,600
-2,400
| -34% | -$160K |
|
4185
CALL
Cathay General Bancorp
CATY
$4.07B
| $310K | ﹤0.01% |
5,000
+4,900
| +4,900% | +$278K |
|
4186
CALL
Delek US
DK
$4.07B
| $310K | ﹤0.01% |
6,100
-48,200
| -89% | -$2.14M |
|
|
DCH
4187
Dauch Corp
DCH
$1.22B
| $310K | ﹤0.01% |
+57,163
| New | +$347K |
|
|
SUPV
4188
CALL
Grupo Supervielle
SUPV
$613M
| $309K | ﹤0.01% |
32,000
+8,500
| +36% | +$78.7K |
|
4189
CALL
Grindr
GRND
$2.73B
| $309K | ﹤0.01% |
21,500
+14,700
| +216% | +$190K |
|
4190
PUT
Integer Holdings
ITGR
$4.29B
| $308K | ﹤0.01% |
3,300
+700
| +27% | +$62.1K |
|
4191
PUT
Qfin Holdings
QFIN
$838M
| $308K | ﹤0.01% |
19,500
-61,500
| -76% | -$863K |
|
4192
PUT
Chegg
CHGG
$80M
| $308K | ﹤0.01% |
305,100
-13,200
| -4% | -$14.5K |
|
4193
LendingTree
TREE
$338M
| $308K | ﹤0.01% |
6,955
+6,473
| +1,343% | +$262K |
|
4194
PUT
EPR Properties
EPR
$4.38B
| $307K | ﹤0.01% |
5,300
-500
| -9% | -$28.4K |
|
4195
Fidelity MSCI Energy Index ETF
FENY
$2.05B
| $307K | ﹤0.01% |
10,376
+8,785
| +552% | +$280K |
|
|
PDS
4196
CALL
Precision Drilling
PDS
$997M
| $307K | ﹤0.01% |
4,000
-15,400
| -79% | -$1.41M |
|
4197
CALL
Diebold Nixdorf
DBD
$2.08B
| $306K | ﹤0.01% |
3,600
+1,900
| +112% | +$153K |
|
4198
AdvisorShares Psychedelics ETF
PSIL
$53.3M
| $306K | ﹤0.01% |
+12,709
| New | +$255K |
|
4199
Applovin
APP
$102B
| $306K | ﹤0.01% |
593
-7,021
| -92% | -$3.39M |
|
4200
Contango Silver & Gold Inc
CTGO
$569M
| $305K | ﹤0.01% |
19,326
+3,751
| +24% | +$77.3K |
|
Similar funds
Simplex Trading's Q2 2026 Portfolio in Review
As of Q2 2026, Simplex Trading held 10,638 positions worth $171B, up 14% from $149B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q2 2026 filing shows 1,714 new, 3,712 increased, 3,486 reduced and 1,487 closed positions. Its largest new stake was Micron Technology: 52,682 shares worth $60.8M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $108M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q2 2026 buy was Micron Technology: 52,682 shares worth $60.8M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q2 2026, an estimated $146M increase.
- Simplex Trading's biggest Q2 2026 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $108M.
- Simplex Trading fully exited Intel in Q2 2026, selling an estimated $76.6M.
- Simplex Trading's ten largest holdings make up 50% of its $171B portfolio in Q2 2026.
- Simplex Trading opened 1,714 new positions and closed 1,487 in Q2 2026.
- Simplex Trading's portfolio value rose 14% quarter-over-quarter to $171B.
Based on Simplex Trading's 13F filing for Q2 2026, filed 12 Aug 2026.