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 | |
|---|---|---|---|---|---|---|---|
7201
PUT
Virtu Financial
VIRT
$4.94B
| $17.9K | ﹤0.01% |
300
+200
| +200% | +$10.5K |
2018 Q2
32 quarters
|
|
7202
CALL
Nexstar Media Group
NXST
$5.16B
| $17.9K | ﹤0.01% |
100
-100
| -50% | -$18.7K |
2021 Q1
21 quarters
|
|
7203
Key Tronic
KTCC
$23.5M
| $17.8K | ﹤0.01% |
4,312
+4,095
| +1,887% | +$13.4K |
2025 Q4
2 quarters
|
|
7204
SIGA Technologies
SIGA
$224M
| $17.8K | ﹤0.01% |
4,885
+402
| +9% | +$1.8K |
2023 Q1
13 quarters
|
|
7205
Leverage Shares 2X Long GEV Daily ETF
GEVG
$8.48M
| $17.8K | ﹤0.01% |
486
+289
| +147% | +$8.48K |
2026 Q1
1 quarter
|
|
7206
Leverage Shares 2X Long HUT Daily ETF
HUTG
$1.56M
| $17.8K | ﹤0.01% |
+578
| New | +$14.5K |
2026 Q2
0 quarters
|
|
7207
DELISTED
Leslie's
LESL
| $17.8K | ﹤0.01% |
+1,750
| New | +$6.86K |
2026 Q2
0 quarters
|
|
7208
PUT
Ventas
VTR
$44.5B
| $17.8K | ﹤0.01% |
200
-7,000
| -97% | -$597K |
2016 Q3
39 quarters
|
|
7209
Streamex Corp
STEX
$51.2M
| $17.8K | ﹤0.01% |
+20,878
| New | +$21.6K |
2026 Q2
0 quarters
|
|
7210
CALL
RLI Corp
RLI
$5.95B
| $17.7K | ﹤0.01% |
300
-800
| -73% | -$42.9K |
2025 Q1
5 quarters
|
|
7211
PUT
Ingles Markets
IMKTA
$1.67B
| $17.7K | ﹤0.01% |
+200
| New | +$17.9K |
2026 Q2
0 quarters
|
|
7212
CALL
Quanterix
QTRX
$135M
| $17.7K | ﹤0.01% |
4,100
-1,800
| -31% | -$5.84K |
2025 Q3
3 quarters
|
|
7213
CALL
Acadia Pharmaceuticals
ACAD
$3.4B
| $17.7K | ﹤0.01% |
700
-30,000
| -98% | -$660K |
2021 Q1
21 quarters
|
|
7214
CALL
Mesabi Trust
MSB
$239M
| $17.7K | ﹤0.01% |
700
-300
| -30% | -$8.25K |
2023 Q1
13 quarters
|
|
7215
CALL
Mach Natural Resources
MNR
$1.81B
| $17.7K | ﹤0.01% |
1,400
-16,200
| -92% | -$216K |
2025 Q4
2 quarters
|
|
7216
Leverage Shares 2X Long OKTA Daily ETF
OKTG
$4.28M
| $17.7K | ﹤0.01% |
616
+478
| +346% | +$7.37K |
2026 Q1
1 quarter
|
|
7217
Lightbridge
LTBR
$179M
| $17.6K | ﹤0.01% |
2,005
-4,258
| -68% | -$48K |
2025 Q3
3 quarters
|
|
7218
PUT
Senseonics Holdings Inc
SENS
$397M
| $17.6K | ﹤0.01% |
3,100
-100
| -3% | -$641 |
2020 Q3
23 quarters
|
|
7219
3D Systems Corp
DDD
$505M
| $17.6K | ﹤0.01% |
5,829
-28,910
| -83% | -$78.8K |
2025 Q3
3 quarters
|
|
7220
CALL
DiaMedica Therapeutics
DMAC
$470M
| $17.6K | ﹤0.01% |
2,500
-1,200
| -32% | -$7.37K |
2025 Q2
4 quarters
|
|
7221
Sprott Uranium Miners ETF
URNM
$1.64B
| $17.6K | ﹤0.01% |
334
-15,963
| -98% | -$987K |
2025 Q4
2 quarters
|
|
7222
PUT
NeoGenomics
NEO
$2.13B
| $17.5K | ﹤0.01% |
1,200
-100
| -8% | -$965 |
2025 Q1
5 quarters
|
|
7223
KFA Mount Lucas Managed Futures Index Strategy ETF
KMLM
$571M
| $17.5K | ﹤0.01% |
+636
| New | +$18.2K |
2026 Q2
0 quarters
|
|
7224
PUT
Fidelity Enhanced Large Cap Value ETF
FELV
$3.52B
| $17.5K | ﹤0.01% |
400
-800
| -67% | -$30.6K |
2025 Q3
3 quarters
|
|
7225
Star Holdings Shares of Beneficial Interest
STHO
$90.7M
| $17.5K | ﹤0.01% |
+1,915
| New | +$16.5K |
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.