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 | Held Since | |
|---|---|---|---|---|---|---|---|
9126
PUT
Enlivex Ltd
ENLV
$3.97M
| $54 | ﹤0.01% |
7
| – | – |
2025 Q4
2 quarters
|
|
9127
Sensus Healthcare
SRTS
$47.2M
| $51 | ﹤0.01% |
+17
| New | +$60 |
2026 Q2
0 quarters
|
|
|
SLAI
9128
CALL
DELISTED
SOLAI Ltd ADS
SLAI
| $45 | ﹤0.01% |
14
| – | – |
2026 Q1
1 quarter
|
|
9129
Covenant Logistics
CVLG
$755M
| $44 | ﹤0.01% |
+1
| New | +$36 |
2026 Q2
0 quarters
|
|
9130
Kurv Yield Premium Strategy Google (GOOGL) ETF
GOOP
$24.5M
| $40 | ﹤0.01% |
1
-253
| -100% | -$10.6K |
2026 Q1
1 quarter
|
|
9131
INmune Bio
INMB
$42.7M
| $37 | ﹤0.01% |
23
-3,343
| -99% | -$4.62K |
2025 Q1
5 quarters
|
|
9132
PUT
Mereo BioPharma
MREO
$45.9M
| $31 | ﹤0.01% |
100
-53,300
| -100% | -$16K |
2023 Q2
12 quarters
|
|
9133
DELISTED
Bitwise Ethereum Strategy
AETH
| $29 | ﹤0.01% |
1
| – | – |
2026 Q1
1 quarter
|
|
9134
KVH Industries
KVHI
$120M
| $29 | ﹤0.01% |
+3
| New | +$29 |
2026 Q2
0 quarters
|
|
9135
VanEck Africa Index ETF
AFK
$92.4M
| $25 | ﹤0.01% |
1
-34
| -97% | -$923 |
2026 Q1
1 quarter
|
|
9136
HF Foods Group
HFFG
$81.7M
| $25 | ﹤0.01% |
18
-102
| -85% | -$197 |
2026 Q1
1 quarter
|
|
9137
CALL
DELISTED
Clearwater Analytics
CWAN
| $23 | ﹤0.01% |
236,400
-212,400
| -47% | -$5.15M |
2026 Q1
1 quarter
|
|
9138
Zhihu
ZH
$283M
| $21 | ﹤0.01% |
7
-219
| -97% | -$704 |
2023 Q3
11 quarters
|
|
9139
PUT
DELISTED
Sleep Number
SNBR
| $19 | ﹤0.01% |
800
+600
| +300% | +$1K |
2021 Q2
20 quarters
|
|
|
OPEG
9140
DELISTED
Leverage Shares 2X Long OPEN Daily ETF
OPEG
| $17 | ﹤0.01% |
+4
| New | +$21 |
2026 Q2
0 quarters
|
|
9141
OneWater Marine
ONEW
$159M
| $11 | ﹤0.01% |
1
-138
| -99% | -$1.48K |
2026 Q1
1 quarter
|
|
9142
SurgePays
SURG
$7.29M
| $10 | ﹤0.01% |
29
-80
| -73% | -$44 |
2024 Q1
9 quarters
|
|
9143
TPG RE Finance Trust
TRTX
$478M
| $8 | ﹤0.01% |
+1
| New | +$8 |
2026 Q2
0 quarters
|
|
9144
PUT
International Bancshares
IBOC
$4.18B
| $6 | ﹤0.01% |
600
| – | – |
2026 Q1
1 quarter
|
|
9145
PUT
DELISTED
Inotiv
NOTV
| $6 | ﹤0.01% |
+600
| New | +$157 |
2026 Q2
0 quarters
|
|
|
9146
PUT
DELISTED
Clearwater Analytics
CWAN
| $3 | ﹤0.01% |
35,700
-11,900
| -25% | -$289K |
2026 Q1
1 quarter
|
|
9147
Goldman Sachs Physical Gold ETF Shares
AAAU
$2.43B
| – | – |
-8,000
| Closed | -$356K | – |
|
9148
T-Rex 2X Long Apple Daily Target ETF
AAPX
$9.5M
| – | – |
-148
| Closed | -$3.77K | – |
|
9149
American Assets Trust
AAT
$1.31B
| – | – |
-613
| Closed | -$13.4K | – |
|
|
9150
PUT
American Assets Trust
AAT
$1.31B
| – | – |
-3,000
| Closed | -$55.2K | – |
|
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.