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 | |
|---|---|---|---|---|---|---|---|
8476
CALL
Constellium
CSTM
$3.27B
| $2.81K | ﹤0.01% |
+500
| New | +$16.1K |
2026 Q2
0 quarters
|
|
8477
CALL
Lyell Immunopharma
LYEL
$233M
| $2.81K | ﹤0.01% |
+200
| New | +$3.62K |
2026 Q2
0 quarters
|
|
8478
ProShares UltraShort Health Care
RXD
$3.1M
| $2.8K | ﹤0.01% |
+165
| New | +$3.25K |
2026 Q2
0 quarters
|
|
8479
CALL
Haleon
HLN
$45.6B
| $2.8K | ﹤0.01% |
300
| – | – |
2022 Q3
15 quarters
|
|
8480
PUT
Gates Industrial Corp
GTES
$6.33B
| $2.8K | ﹤0.01% |
100
-500
| -83% | -$12.8K |
2024 Q1
9 quarters
|
|
8481
PUT
Del Monte Corp
DMC
$1.4B
| $2.79K | ﹤0.01% |
100
-100
| -50% | -$3.52K |
2025 Q4
2 quarters
|
|
8482
Energizer
ENR
$1.6B
| $2.79K | ﹤0.01% |
+130
| New | +$2.48K |
2026 Q2
0 quarters
|
|
8483
CALL
NetSol Technologies
NTWK
$88.4M
| $2.77K | ﹤0.01% |
600
+400
| +200% | +$1.61K |
2025 Q3
3 quarters
|
|
8484
PUT
Lineage Cell Therapeutics
LCTX
$253M
| $2.75K | ﹤0.01% |
2,100
| – | – |
2026 Q1
1 quarter
|
|
8485
CALL
Genpact
G
$6.9B
| $2.75K | ﹤0.01% |
100
-1,000
| -91% | -$32.9K |
2023 Q4
10 quarters
|
|
8486
Pacer Metaurus US Large Cap Dividend Multiplier 400 ETF
QDPL
$1.82B
| $2.75K | ﹤0.01% |
+61
| New | +$2.71K |
2026 Q2
0 quarters
|
|
8487
REX-Osprey XRP ETF
XRPR
$50.2M
| $2.74K | ﹤0.01% |
+320
| New | +$3.42K |
2026 Q2
0 quarters
|
|
8488
CALL
RBB Bancorp
RBB
$452M
| $2.74K | ﹤0.01% |
100
| – | – |
2026 Q1
1 quarter
|
|
|
8489
PUT
RBB Bancorp
RBB
$452M
| $2.74K | ﹤0.01% |
+100
| New | +$2.4K |
2026 Q2
0 quarters
|
|
8490
CALL
Matrix Service
MTRX
$274M
| $2.74K | ﹤0.01% |
200
-7,600
| -97% | -$97.9K |
2025 Q1
5 quarters
|
|
8491
PUT
Rocket Pharmaceuticals
RCKT
$250M
| $2.74K | ﹤0.01% |
800
-6,200
| -89% | -$20.6K |
2022 Q1
17 quarters
|
|
8492
PUT
RCI Hospitality Holdings
RICK
$206M
| $2.73K | ﹤0.01% |
100
-1,000
| -91% | -$25.3K |
2018 Q3
31 quarters
|
|
8493
PUT
GeoPark
GPRK
$735M
| $2.73K | ﹤0.01% |
300
-6,900
| -96% | -$67.2K |
2023 Q3
11 quarters
|
|
8494
CALL
Perma-Pipe International
PPIH
$235M
| $2.72K | ﹤0.01% |
100
-200
| -67% | -$6.18K |
2025 Q2
4 quarters
|
|
8495
YieldMax TSM Option Income Strategy ETF
TSMY
$96.1M
| $2.71K | ﹤0.01% |
+151
| New | +$2.51K |
2026 Q2
0 quarters
|
|
8496
CALL
Codexis
CDXS
$141M
| $2.71K | ﹤0.01% |
1,200
-4,100
| -77% | -$10.2K |
2024 Q1
9 quarters
|
|
8497
Cypherpunk Technologies Inc
CYPH
$314M
| $2.71K | ﹤0.01% |
4,427
-34,769
| -89% | -$31.8K |
2024 Q3
7 quarters
|
|
8498
Fidus Investment
FDUS
$744M
| $2.71K | ﹤0.01% |
142
-751
| -84% | -$13.9K |
2025 Q2
4 quarters
|
|
8499
PUT
Warner Music
WMG
$16.7B
| $2.71K | ﹤0.01% |
100
| – | – |
2020 Q2
24 quarters
|
|
8500
CALL
ReposiTrak
TRAK
$133M
| $2.7K | ﹤0.01% |
300
+200
| +200% | +$1.83K |
2025 Q4
2 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.