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 | |
|---|---|---|---|---|---|---|---|
8226
T-REX 2X Long GME Daily Target ETF
GMEU
$27.6M
| $4.56K | ﹤0.01% |
549
+322
| +142% | +$3.08K |
2025 Q2
4 quarters
|
|
8227
CALL
Applied Aerospace & Defense Inc
AADX
$1.7B
| $4.56K | ﹤0.01% |
+200
| New | +$3.93K |
2026 Q2
0 quarters
|
|
8228
Core Laboratories
CLB
$432M
| $4.54K | ﹤0.01% |
+390
| New | +$5.57K |
2026 Q2
0 quarters
|
|
8229
T-Rex 2X Inverse Bitcoin Daily Target ETF
BTCZ
$16.2M
| $4.52K | ﹤0.01% |
681
-3,356
| -83% | -$16.2K |
2026 Q1
1 quarter
|
|
|
NVA
8230
Nova Minerals Corp
NVA
$122M
| $4.52K | ﹤0.01% |
958
-1,006
| -51% | -$6.1K |
2026 Q1
1 quarter
|
|
8231
CALL
Opus Genetics
IRD
$328M
| $4.52K | ﹤0.01% |
1,100
-22,200
| -95% | -$104K |
2025 Q4
2 quarters
|
|
8232
PUT
ZenaTech Inc
ZENA
$198M
| $4.5K | ﹤0.01% |
3,000
-400
| -12% | -$717 |
2025 Q2
4 quarters
|
|
8233
iShares MSCI Intl Momentum Factor ETF
IMTM
$4.13B
| $4.48K | ﹤0.01% |
84
+55
| +190% | +$2.87K |
2025 Q3
3 quarters
|
|
8234
PUT
Gencor Industries
GENC
$259M
| $4.48K | ﹤0.01% |
300
| – | – |
2026 Q1
1 quarter
|
|
8235
CALL
China Automotive Systems
CAAS
$133M
| $4.47K | ﹤0.01% |
1,000
| – | – |
2026 Q1
1 quarter
|
|
8236
PUT
Materialise
MTLS
$489M
| $4.46K | ﹤0.01% |
600
| – | – |
2025 Q4
2 quarters
|
|
8237
PUT
Afya
AFYA
$1.33B
| $4.45K | ﹤0.01% |
300
+200
| +200% | +$2.9K |
2026 Q1
1 quarter
|
|
8238
CALL
Jade Biosciences
JBIO
$950M
| $4.44K | ﹤0.01% |
200
-200
| -50% | -$4.17K |
2025 Q4
2 quarters
|
|
8239
INVE Technologies, Inc. Common Stock
INVE
$66.6M
| $4.44K | ﹤0.01% |
+1,761
| New | +$7.07K |
2026 Q2
0 quarters
|
|
8240
PUT
Canary XRP ETF
XRPC
$303M
| $4.43K | ﹤0.01% |
400
+100
| +33% | +$1.39K |
2026 Q1
1 quarter
|
|
8241
PUT
Zevia
ZVIA
$89.4M
| $4.4K | ﹤0.01% |
2,700
+2,600
| +2,600% | +$3.53K |
2025 Q4
2 quarters
|
|
8242
TaskUs
TASK
$800M
| $4.4K | ﹤0.01% |
+940
| New | +$5.7K |
2026 Q2
0 quarters
|
|
8243
Chaince Digital Holdings
CD
$877M
| $4.4K | ﹤0.01% |
1,006
+952
| +1,763% | +$5.6K |
2026 Q1
1 quarter
|
|
8244
Strive 500 ETF
STXF
$1.16B
| $4.4K | ﹤0.01% |
+91
| New | +$4.26K |
2026 Q2
0 quarters
|
|
8245
CALL
Nomura Holdings
NMR
$26.5B
| $4.39K | ﹤0.01% |
+500
| New | +$4.16K |
2026 Q2
0 quarters
|
|
8246
PUT
Universal Health Realty Income Trust
UHT
$524M
| $4.39K | ﹤0.01% |
100
| – | – |
2026 Q1
1 quarter
|
|
8247
Invesco KBW Premium Yield Equity REIT ETF
KBWY
$286M
| $4.38K | ﹤0.01% |
+236
| New | +$4.05K |
2026 Q2
0 quarters
|
|
8248
State Street SPDR Portfolio Long Term Treasury ETF
SPTL
$11.7B
| $4.38K | ﹤0.01% |
167
-2,253
| -93% | -$58.7K |
2025 Q3
3 quarters
|
|
8249
CALL
Health Catalyst
HCAT
$132M
| $4.38K | ﹤0.01% |
2,200
-800
| -27% | -$1.16K |
2025 Q2
4 quarters
|
|
8250
PUT
Univest Financial
UVSP
$1.17B
| $4.38K | ﹤0.01% |
+100
| New | +$3.92K |
2026 Q2
0 quarters
|
|
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.