§ 13F · FUND PROFILE
GROUP ONE TRADING LLC.
Options market maker, proprietary trading
AUM · $71.1B (13F)Positions · 8032Turnover · 92% · Q2Filed · Aug 14, 2026
CONCENTRATION
18%
Top 10 holdings
NEW BUYS
+1401
+$2.3B deployed
EXITS
0
No exits
SECTOR SHIFT
OTHER → SEMICONDUCTORS
-6pp · +8pp
§ 01 · TOP HOLDINGS
The book · Q2 2026
FILED AUG 14, 2026
| # | Ticker | Name | Shares | $ value | % port | Δ Q2 |
|---|---|---|---|---|---|---|
| 1 | MU | MICRON TECHNOLOGY INC | 2.07M | $2.4B | 3.4% | +40% |
| 2 | MU | MICRON TECHNOLOGY INC | 1.71M | $2.0B | 2.8% | +26% |
| 3 | GLD | SPDR GOLD TR | 3.71M | $1.4B | 1.9% | −7% |
| 4 | SNDK | SANDISK CORP | 553K | $1.3B | 1.8% | +39% |
| 5 | TSLA | TESLA INC | 2.81M | $1.2B | 1.7% | −2% |
| 6 | META | META PLATFORMS INC | 1.82M | $1.0B | 1.4% | +19% |
| 7 | MSFT | MICROSOFT CORP | 2.39M | $892M | 1.3% | +105% |
| 8 | — | VANECK ETF TRUST | 1.35M | $884M | 1.2% | — |
| 9 | SNDK | SANDISK CORP | 373K | $847M | 1.2% | +22% |
| 10 | INTC | INTEL CORP | 4.99M | $697M | 1.0% | −31% |
§ 02 · SECTOR ALLOCATION
Where the money is
Other30.6% (−6pp)
Semiconductors17.7% (+8pp)
Technology15.3% (+4pp)
Media4.8% (−1pp)
Financial Services3.4% (−1pp)
Health Care3.3%
§ 03 · THE GROUP SIGNAL
AC read
GROUP ONE TRADING LLC is a Systematic / Quant fund managing $71.1 billion in assets. The fund runs a massive portfolio of 8,032 positions, broad diversification across holdings. Trading activity is aggressive at 92% quarterly turnover, with 1401 new positions and 0 exits last quarter. Top sector allocations: Other (31%), Semiconductors (18%), Technology (15%).
Read the full dossier →§ 04 · FILING HISTORY
Q-by-Q deltas
4 OF 2 FILINGS MEASURED
Q2 2026
Busy quarter
+1401 buys · −0 exits · 6005 changed
Q1 2026
Busy quarter
+1226 buys · −0 exits · 6257 changed
Q4 2025
Busy quarter
+1283 buys · −0 exits · 6673 changed
Q3 2025
Busy quarter
+8656 buys · −0 exits · 0 changed