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 | |
|---|---|---|---|---|---|---|---|
6401
Direxion Daily CSI 300 China A Share Bull 2X ETF
CHAU
$70.2M
| $44.6K | ﹤0.01% |
1,788
-166
| -8% | -$3.89K |
2025 Q3
3 quarters
|
|
6402
CALL
Sixth Street Specialty
TSLX
$1.61B
| $44.6K | ﹤0.01% |
2,600
+400
| +18% | +$7.14K |
2026 Q1
1 quarter
|
|
6403
PUT
XPEL
XPEL
$1.17B
| $44.6K | ﹤0.01% |
+900
| New | +$41K |
2026 Q2
0 quarters
|
|
6404
CALL
Transportadora de Gas del Sur
TGS
$3.9B
| $44.6K | ﹤0.01% |
1,500
-7,000
| -82% | -$217K |
2026 Q1
1 quarter
|
|
6405
GraniteShares 2x Long RDDT Daily ETF
RDTL
$42.2M
| $44.6K | ﹤0.01% |
2,124
-678
| -24% | -$13.2K |
2025 Q4
2 quarters
|
|
6406
Dyne Therapeutics
DYN
$2.94B
| $44.6K | ﹤0.01% |
2,007
+273
| +16% | +$5.08K |
2025 Q1
5 quarters
|
|
6407
PUT
Brookfield Renewable
BEPC
$5.44B
| $44.5K | ﹤0.01% |
1,200
-1,300
| -52% | -$50.3K |
2020 Q3
23 quarters
|
|
6408
PUT
Revvity
RVTY
$17.9B
| $44.5K | ﹤0.01% |
400
+300
| +300% | +$28.9K |
2025 Q2
4 quarters
|
|
6409
CALL
Axalta
AXTA
$7.31B
| $44.5K | ﹤0.01% |
1,300
+1,200
| +1,200% | +$36.1K |
2025 Q3
3 quarters
|
|
6410
Fortress Biotech
FBIO
$62.4M
| $44.4K | ﹤0.01% |
14,508
-43,821
| -75% | -$113K |
2026 Q1
1 quarter
|
|
6411
Range Global Coal Index ETF
COAL
$54.1M
| $44.4K | ﹤0.01% |
1,932
-3,781
| -66% | -$97K |
2026 Q1
1 quarter
|
|
6412
PUT
Organogenesis Holdings
ORGO
$120M
| $44.2K | ﹤0.01% |
18,200
+700
| +4% | +$1.71K |
2022 Q4
14 quarters
|
|
6413
CALL
Saic
SAIC
$6.22B
| $44.2K | ﹤0.01% |
400
-300
| -43% | -$30.3K |
2026 Q1
1 quarter
|
|
6414
PUT
American Battery Technology Co
ABAT
$182M
| $44.1K | ﹤0.01% |
15,600
-800
| -5% | -$2.56K |
2023 Q4
10 quarters
|
|
6415
iShares Top 20 U.S. Stocks ETF
TOPT
$776M
| $44.1K | ﹤0.01% |
1,340
+538
| +67% | +$17.5K |
2024 Q4
6 quarters
|
|
6416
Penske Automotive Group
PAG
$13.9B
| $44K | ﹤0.01% |
+246
| New | +$41.1K |
2026 Q2
0 quarters
|
|
6417
CALL
Harbor Ares Systematic High Yield ETF
SIHY
$135M
| $44K | ﹤0.01% |
1,500
+1,200
| +400% | +$54.4K |
2026 Q1
1 quarter
|
|
6418
PUT
Genpact
G
$6.77B
| $44K | ﹤0.01% |
1,600
+1,400
| +700% | +$46K |
2023 Q3
11 quarters
|
|
6419
CALL
Solid Biosciences
SLDB
$623M
| $44K | ﹤0.01% |
4,400
+3,500
| +389% | +$26.5K |
2024 Q1
9 quarters
|
|
6420
ReposiTrak
TRAK
$131M
| $43.9K | ﹤0.01% |
4,881
+1,125
| +30% | +$10.3K |
2025 Q4
2 quarters
|
|
6421
PUT
Abeona Therapeutics
ABEO
$246M
| $43.9K | ﹤0.01% |
7,100
-22,900
| -76% | -$126K |
2025 Q1
5 quarters
|
|
6422
CALL
HUB Group
HUBG
$1.59B
| $43.8K | ﹤0.01% |
+1,000
| New | +$42K |
2026 Q2
0 quarters
|
|
6423
CALL
SelectQuote
SLQT
$58.6M
| $43.7K | ﹤0.01% |
52,000
-26,100
| -33% | -$23.8K |
2020 Q3
23 quarters
|
|
6424
PUT
Extra Space Storage
EXR
$30.3B
| $43.6K | ﹤0.01% |
300
-200
| -40% | -$28.6K |
2016 Q4
38 quarters
|
|
6425
CALL
TPG Mortgage Investment Trust
MITT
$175M
| $43.6K | ﹤0.01% |
5,500
+2,400
| +77% | +$18.7K |
2021 Q2
20 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.