FINRA margin debit balances

Official monthly debit balances in customers' securities margin accounts under FINRA Rule 4521(d), and their 15-month rate of change. The 60% greed line is a Kizemchuk heuristic: RoC rolling back below 60% has historically clustered near major market tops. That is not a validated composite input — the indicator is registered at weight 0 pending IC. This is not FINRA Reg SHO short volume (the dark-pool tape).