13F value (AUM)
$71.1B
GR
Group One Trading
GROUP ONE TRADING LLC
$71.1B
13F long value · 2026-Q2Positions7824
CategoryAsset Manager
Quarters tracked9
▲ #147 of 581 by 13F value
Size rank 8/10
17 NEW167 ADD299 2×+399 TRIM210 NEAR EXIT7 EXIT
Snapshot
Group One Trading's 13F portfolio at a glance — size, concentration and this quarter's activity.
Positions
7824 (5865 unmapped)
Top 100 weight
49.8%
Quarters tracked
9
Latest 13F filed
Aug 14, 2026
New positions
17
Exits / near-exits
217
13F value by quarter
Total reported long value each quarter — fund flows plus market moves.
Top holdings — 2026-Q2
The fund's largest reported positions (PUT/CALL rows are option positions, reported separately). The 100 shown cover 49.8% of the portfolio.
| Ticker | Issuer | Weight | Value | Shares |
|---|---|---|---|---|
| — PUT | MICRON TECHNOLOGY INC | 3.4% | $2.4B | 2.1M |
| — CALL | MICRON TECHNOLOGY INC | 2.8% | $2.0B | 1.7M |
| — CALL | SPDR GOLD TR | 1.9% | $1.4B | 3.7M |
| — PUT | SANDISK CORP | 1.8% | $1.3B | 552.5K |
| — CALL | TESLA INC | 1.7% | $1.2B | 2.8M |
| — CALL | META PLATFORMS INC | 1.4% | $1.0B | 1.8M |
| — PUT | VANECK ETF TRUST | 1.4% | $1.0B | 3.0M |
| — CALL | MICROSOFT CORP | 1.3% | $892.0M | 2.4M |
| — CALL | SANDISK CORP | 1.2% | $847.0M | 372.5K |
| — CALL | INTEL CORP | 1.0% | $697.3M | 5.0M |
| — CALL | APPLE INC | 1.0% | $680.4M | 2.4M |
| — PUT | TESLA INC | 0.9% | $673.8M | 1.6M |
| — CALL | UNITEDHEALTH GROUP INC | 0.9% | $670.7M | 1.6M |
| — CALL | NVIDIA CORPORATION | 0.9% | $631.7M | 3.2M |
| — CALL | VANECK ETF TRUST | 0.9% | $608.1M | 4.0M |
Option positions — 2026-Q2
$25.9B across 2608 put positions vs $41.7B across 3059 call positions — put/call ratio 0.62. Values are notional — the market value of the shares the options reference.
| Type | Ticker | Issuer | Underlying shares | Notional value | % of 13F value |
|---|---|---|---|---|---|
| CALL | — | ZYMEWORKS INC | 774.4M | $41.7B | 58.7% |
| PUT | — | ZYMEWORKS INC | 351.1M | $25.9B | 36.4% |
Quarterly changes — 2026-Q2
What Group One Trading opened, added, trimmed and exited this quarter, largest dollar moves first.
| Action | Ticker | Issuer | Prev shares | Curr shares | Change | Value Δ |
|---|---|---|---|---|---|---|
| NEW | DRAM | ROUNDHILL ETF TRUST | — | 1.5M | — | +$108.6M |
| NEAR EXIT | SILJ | AMPLIFY ETF TR | 2.4M | 169.7K | -93.0% | -$67.5M |
| 2×+ | MRVL | MARVELL TECHNOLOGY INC | 47.7K | 187.0K | +292.2% | +$51.0M |
| 2×+ | UNH | UNITEDHEALTH GROUP INC | 26.0K | 127.4K | +390.6% | +$45.9M |
| ADD | TSM | TAIWAN SEMICONDUCTOR MANUFAC | 138.1K | 193.2K | +40.0% | +$45.6M |
| NEW | BKNG | BOOKING HOLDINGS INC | — | 191.7K | — | +$34.2M |
| TRIM | MU | MICRON TECHNOLOGY INC | 155.7K | 72.9K | -53.2% | +$31.6M |
| 2×+ | FCEL | FUELCELL ENERGY INC | 50.8K | 696.4K | +1270.3% | +$24.7M |
| TRIM | PBR | PETROLEO BRASILEIRO S A | 1.6M | 516.5K | -67.3% | -$24.5M |
| EXIT | CYTK | CYTOKINETICS INC | 364.0K | 0 | -100.0% | -$24.0M |
Conviction over time
Portfolio weight of the current top long holdings, quarter by quarter — rising weight = growing conviction.