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 | |
|---|---|---|---|---|---|---|---|
6726
Yext
YEXT
$719M
| $31K | ﹤0.01% |
6,636
-70,186
| -91% | -$272K |
2024 Q4
6 quarters
|
|
6727
CALL
MasterCraft Boat Holdings
MCFT
$479M
| $31K | ﹤0.01% |
1,200
+300
| +33% | +$6.98K |
2025 Q4
2 quarters
|
|
6728
PUT
WPP
WPP
$5.67B
| $31K | ﹤0.01% |
2,000
-13,300
| -87% | -$237K |
2023 Q3
11 quarters
|
|
6729
PUT
National Fuel Gas
NFG
$7.72B
| $30.9K | ﹤0.01% |
400
+100
| +33% | +$8.28K |
2019 Q1
29 quarters
|
|
6730
Cellebrite
CLBT
$3.03B
| $30.9K | ﹤0.01% |
2,114
-14,921
| -88% | -$197K |
2025 Q2
4 quarters
|
|
6731
Roundhill Bitcoin Covered Call Strategy ETF
YBTC
$137M
| $30.8K | ﹤0.01% |
1,866
+113
| +6% | +$2.32K |
2025 Q4
2 quarters
|
|
6732
Quanterix
QTRX
$135M
| $30.8K | ﹤0.01% |
+7,127
| New | +$23.1K |
2026 Q2
0 quarters
|
|
6733
CALL
Blend Labs
BLND
$272M
| $30.8K | ﹤0.01% |
18,000
-17,200
| -49% | -$27.4K |
2023 Q2
12 quarters
|
|
6734
CALL
ProShares Ultra SpaceX
SPCF
$74.7M
| $30.8K | ﹤0.01% |
+1,200
| New | +$32.1K |
2026 Q2
0 quarters
|
|
6735
Infinity Natural Resources
INR
$267M
| $30.6K | ﹤0.01% |
+2,412
| New | +$35.9K |
2026 Q2
0 quarters
|
|
6736
CALL
FTAI Infrastructure
FIP
$292M
| $30.6K | ﹤0.01% |
6,600
-5,500
| -45% | -$27.4K |
2023 Q2
12 quarters
|
|
6737
CALL
Ocean Power Technologies
OPTT
$5.85M
| $30.6K | ﹤0.01% |
3,893
-294
| -7% | -$2.99K |
2024 Q3
7 quarters
|
|
6738
CALL
Farmers & Merchants Bancorp
FMAO
$510M
| $30.6K | ﹤0.01% |
+1,000
| New | +$27.6K |
2026 Q2
0 quarters
|
|
6739
Embecta
EMBC
$385M
| $30.6K | ﹤0.01% |
9,377
+1,984
| +27% | +$10.8K |
2026 Q1
1 quarter
|
|
6740
PUT
Pulse Biosciences
PLSE
$3.79B
| $30.5K | ﹤0.01% |
1,100
+1,000
| +1,000% | +$23.6K |
2026 Q1
1 quarter
|
|
6741
PUT
Cohen & Steers
CNS
$3.68B
| $30.5K | ﹤0.01% |
+400
| New | +$28.3K |
2026 Q2
0 quarters
|
|
6742
CALL
Eledon Pharmaceuticals
ELDN
$183M
| $30.3K | ﹤0.01% |
7,700
-1,100
| -13% | -$4K |
2025 Q2
4 quarters
|
|
6743
NerdWallet
NRDS
$683M
| $30.3K | ﹤0.01% |
+3,275
| New | +$30.6K |
2026 Q2
0 quarters
|
|
6744
PUT
Cartesian Therapeutics
RNAC
$188M
| $30.2K | ﹤0.01% |
2,900
+2,400
| +480% | +$17.8K |
2025 Q4
2 quarters
|
|
6745
CALL
Nerdy
NRDY
$48.4M
| $30K | ﹤0.01% |
2,187
-5,886
| -73% | -$76.9K |
2025 Q4
2 quarters
|
|
6746
Centerra Gold
CGAU
$3.97B
| $30K | ﹤0.01% |
1,892
-10,856
| -85% | -$190K |
2024 Q4
6 quarters
|
|
6747
PUT
Ascent Solar Technologies
ASTI
$16.1M
| $30K | ﹤0.01% |
+6,000
| New | +$32.4K |
2026 Q2
0 quarters
|
|
6748
PUT
GCT Semiconductor Holding
GCTS
$120M
| $30K | ﹤0.01% |
+10,100
| New | +$21.5K |
2026 Q2
0 quarters
|
|
6749
Simplify Managed Futures Strategy ETF
CTA
$1.39B
| $30K | ﹤0.01% |
1,156
-544
| -32% | -$16.1K |
2026 Q1
1 quarter
|
|
6750
GraniteShares 2x Long IONQ Daily ETF
IONL
$39.8M
| $30K | ﹤0.01% |
1,107
+1,016
| +1,116% | +$29.6K |
2026 Q1
1 quarter
|
|
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.