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 | |
|---|---|---|---|---|---|---|---|
6326
Boot Barn
BOOT
$3.46B
| $48.8K | ﹤0.01% |
+297
| New | +$48.2K |
2026 Q2
0 quarters
|
|
6327
Transmedics
TMDX
$2.45B
| $48.8K | ﹤0.01% |
+734
| New | +$62.1K |
2026 Q2
0 quarters
|
|
6328
CALL
Axos Financial
AX
$5.21B
| $48.7K | ﹤0.01% |
500
-400
| -44% | -$36K |
2022 Q3
15 quarters
|
|
6329
CALL
Sabesp
SBS
$16.6B
| $48.6K | ﹤0.01% |
8,400
-60,100
| -88% | -$364K |
2026 Q1
1 quarter
|
|
6330
CALL
MediWound
MDWD
$156M
| $48.5K | ﹤0.01% |
3,300
+3,200
| +3,200% | +$50.8K |
2024 Q2
8 quarters
|
|
6331
PUT
SITE Centers
SITC
$195M
| $48.4K | ﹤0.01% |
12,200
+2,100
| +21% | +$10.9K |
2025 Q4
2 quarters
|
|
6332
PUT
Redwood Trust
RWT
$406M
| $48.3K | ﹤0.01% |
10,200
+6,200
| +155% | +$33.7K |
2018 Q4
30 quarters
|
|
6333
CALL
Equitable Holdings
EQH
$14.6B
| $48.3K | ﹤0.01% |
1,100
-4,200
| -79% | -$176K |
2018 Q2
32 quarters
|
|
6334
PUT
Savara
SVRA
$929M
| $48K | ﹤0.01% |
7,800
-2,300
| -23% | -$12.3K |
2025 Q3
3 quarters
|
|
6335
PUT
Teekay
TK
$1.3B
| $48K | ﹤0.01% |
4,800
-13,500
| -74% | -$169K |
2014 Q4
46 quarters
|
|
6336
Outfront Media
OUT
$5.58B
| $48K | ﹤0.01% |
+1,465
| New | +$45.5K |
2026 Q2
0 quarters
|
|
6337
PUT
Canaan Creative
CAN
$155M
| $48K | ﹤0.01% |
167,200
+103,200
| +161% | +$44.8K |
2021 Q2
20 quarters
|
|
6338
PUT
Ibotta
IBTA
$981M
| $47.8K | ﹤0.01% |
1,400
| – | – |
2024 Q4
6 quarters
|
|
6339
PUT
Nuvectis Pharma
NVCT
$604M
| $47.8K | ﹤0.01% |
+2,600
| New | +$29.1K |
2026 Q2
0 quarters
|
|
6340
Boston Beer
SAM
$2.05B
| $47.8K | ﹤0.01% |
270
-1,022
| -79% | -$207K |
2025 Q3
3 quarters
|
|
6341
Frequency Electronics
FEIM
$758M
| $47.8K | ﹤0.01% |
720
+564
| +362% | +$34.7K |
2025 Q4
2 quarters
|
|
6342
PetMed Express
PETS
$25.1M
| $47.7K | ﹤0.01% |
+24,845
| New | +$52.7K |
2026 Q2
0 quarters
|
|
6343
CALL
Evolent Health
EVH
$512M
| $47.7K | ﹤0.01% |
8,800
-5,800
| -40% | -$22.2K |
2021 Q2
20 quarters
|
|
6344
CALL
Quaker Houghton
KWR
$2.66B
| $47.7K | ﹤0.01% |
+300
| New | +$42.2K |
2026 Q2
0 quarters
|
|
|
6345
PUT
Quaker Houghton
KWR
$2.66B
| $47.7K | ﹤0.01% |
300
+200
| +200% | +$28.1K |
2026 Q1
1 quarter
|
|
6346
CALL
Equifax
EFX
$21B
| $47.6K | ﹤0.01% |
300
-3,300
| -92% | -$562K |
2016 Q4
38 quarters
|
|
6347
CALL
Global X MSCI Norway ETF
NORW
$94.1M
| $47.6K | ﹤0.01% |
600
-22,200
| -97% | -$833K |
2017 Q1
37 quarters
|
|
6348
PUT
Arqit Quantum
ARQQ
$284M
| $47.6K | ﹤0.01% |
1,600
+500
| +45% | +$8.14K |
2025 Q1
5 quarters
|
|
6349
CALL
Odyssey Marine Exploration
OMEX
$29.8M
| $47.5K | ﹤0.01% |
55,900
-20,900
| -27% | -$21.3K |
2022 Q3
15 quarters
|
|
6350
Defiance Daily Target 2X Long HIMS ETF
HIMZ
$45.3M
| $47.5K | ﹤0.01% |
974
-2,468
| -72% | -$83.4K |
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.