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 | |
|---|---|---|---|---|---|---|---|
7726
CALL
Perdoceo Education
PRDO
$2.1B
| $9.6K | ﹤0.01% |
300
+200
| +200% | +$6.86K |
2025 Q4
2 quarters
|
|
7727
PUT
Invivyd
IVVD
$177M
| $9.6K | ﹤0.01% |
11,000
+2,900
| +36% | +$3.64K |
2025 Q1
5 quarters
|
|
7728
SonicShares Global Shipping ETF
BOAT
$130M
| $9.6K | ﹤0.01% |
+252
| New | +$10.4K |
2026 Q2
0 quarters
|
|
7729
CALL
Oaktree Specialty Lending
OCSL
$1B
| $9.6K | ﹤0.01% |
800
-15,700
| -95% | -$189K |
2026 Q1
1 quarter
|
|
7730
Ionic Inflation Protection ETF
CPII
$11.5M
| $9.5K | ﹤0.01% |
+500
| New | +$9.6K |
2026 Q2
0 quarters
|
|
|
7731
PUT
Ionic Inflation Protection ETF
CPII
$11.5M
| $9.5K | ﹤0.01% |
+500
| New | +$9.6K |
2026 Q2
0 quarters
|
|
|
NVX
7732
CALL
NOVONIX
NVX
$50.6M
| $9.48K | ﹤0.01% |
2,060
-180
| -8% | -$1.2K |
2024 Q4
6 quarters
|
|
7733
PUT
Inhibrx
INBX
$1.38B
| $9.48K | ﹤0.01% |
100
-800
| -89% | -$80.2K |
2025 Q3
3 quarters
|
|
7734
YieldMax NFLX Option Income Strategy ETF
NFLY
$32.5M
| $9.48K | ﹤0.01% |
1,201
-1,844
| -61% | -$17.9K |
2025 Q4
2 quarters
|
|
7735
ProShares UltraShort Real Estate
SRS
$16.1M
| $9.46K | ﹤0.01% |
+235
| New | +$9.7K |
2026 Q2
0 quarters
|
|
7736
iShares MSCI USA Size Factor ETF
SIZE
$431M
| $9.45K | ﹤0.01% |
+53
| New | +$9.09K |
2026 Q2
0 quarters
|
|
7737
CALL
Goldman Sachs ActiveBeta International Equity ETF
GSIE
$5.9B
| $9.44K | ﹤0.01% |
+100
| New | +$4.54K |
2026 Q2
0 quarters
|
|
7738
CALL
National Beverage
FIZZ
$3.37B
| $9.36K | ﹤0.01% |
300
-200
| -40% | -$6.97K |
2021 Q2
20 quarters
|
|
7739
Dime Commercial Bancshares
DCOM
$1.88B
| $9.35K | ﹤0.01% |
230
-2,272
| -91% | -$84.5K |
2026 Q1
1 quarter
|
|
7740
PUT
NETGEAR
NTGR
$611M
| $9.34K | ﹤0.01% |
400
-22,000
| -98% | -$548K |
2018 Q2
32 quarters
|
|
7741
CALL
Supernus Pharmaceuticals
SUPN
$2.34B
| $9.3K | ﹤0.01% |
200
+100
| +100% | +$4.8K |
2026 Q1
1 quarter
|
|
7742
PUT
Silgan Holdings
SLGN
$4.19B
| $9.28K | ﹤0.01% |
200
-200
| -50% | -$7.99K |
2025 Q3
3 quarters
|
|
7743
PUT
Transcat
TRNS
$771M
| $9.28K | ﹤0.01% |
100
| – | – |
2026 Q1
1 quarter
|
|
7744
Otter Tail
OTTR
$3.78B
| $9.27K | ﹤0.01% |
103
+88
| +587% | +$7.78K |
2025 Q3
3 quarters
|
|
7745
Fortrea Holdings
FTRE
$2.24B
| $9.26K | ﹤0.01% |
+532
| New | +$7.18K |
2026 Q2
0 quarters
|
|
7746
Kontoor Brands
KTB
$4.14B
| $9.25K | ﹤0.01% |
111
-56
| -34% | -$4.08K |
2026 Q1
1 quarter
|
|
7747
CALL
Pliant Therapeutics
PLRX
$52.4M
| $9.23K | ﹤0.01% |
8,100
-1,600
| -16% | -$1.95K |
2025 Q4
2 quarters
|
|
7748
Foghorn Therapeutics
FHTX
$119M
| $9.23K | ﹤0.01% |
1,892
+1,826
| +2,767% | +$8.1K |
2026 Q1
1 quarter
|
|
7749
CALL
Business First Bancshares
BFST
$1.04B
| $9.22K | ﹤0.01% |
300
+200
| +200% | +$5.65K |
2026 Q1
1 quarter
|
|
7750
PUT
BRC Inc
BRCC
$161M
| $9.21K | ﹤0.01% |
830
-80
| -9% | -$990 |
2022 Q1
17 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.