What is a snowball structured note, and how does the cumulative coupon memory feature amplify both return potential and risk?

A snowball note is a path-dependent structured product where the coupon for each period includes all previously missed coupons from periods when the reference was below the coupon barrier. This 'snowball' accumulation creates a compelling recovery narrative but embeds significant tail risk if the underlying declines substantially.\n\nSnowball Coupon Mechanics:\n\nAt each observation date, the coupon paid is:\n\nCoupon_t = max(0, base_coupon x t - sum of all previously paid coupons)\n\nIf the underlying was below the coupon barrier for periods 1-4 but recovers above it in period 5, the investor receives five periods' worth of coupons at once.\n\n`mermaid\ngraph TD\n A[\"Period 1: Above barrier\"] -->|\"Coupon = 1 x C\"| B[\"Paid: C\"]\n C[\"Period 2: Below barrier\"] -->|\"Coupon = 0\"| D[\"Missed: C
Snowball accumulates\"]\n E[\"Period 3: Below barrier\"] -->|\"Coupon = 0\"| F[\"Missed: 2C
Snowball grows\"]\n G[\"Period 4: Above barrier\"] -->|\"Coupon = 3 x C\"| H[\"Paid: 3C
(catches up all missed)\"]\n B --> C\n D --> E\n F --> G\n`\n\nWorked Example -- Windgate Securities:\n\nWindgate issues a 2-year snowball note on the Silverton 50 Index (initial: 11,400):\n\n- Autocall barrier: 100% (11,400), quarterly from month 6\n- Coupon barrier: 80% (9,120)\n- Knock-in put barrier: 70% (7,980), continuous monitoring\n- Base coupon: 3.20% per quarter (12.80% annualized)\n- Notional: $200,000\n\nPath Simulation:\n\n| Quarter | Index Level | vs. Initial | Coupon Barrier? | Autocall? | Coupon Paid |\n|---|---|---|---|---|---|\n| Q1 | 10,800 | 94.7% | Above 80% | N/A (no autocall Q1) | $6,400 |\n| Q2 | 8,900 | 78.1% | Below 80% | Not eligible Q2 | $0 (snowball: $6,400) |\n| Q3 | 8,650 | 75.9% | Below 80% | Below 100% | $0 (snowball: $12,800) |\n| Q4 | 9,500 | 83.3% | Above 80% | Below 100% | $19,200 (3 quarters caught up) |\n| Q5 | 11,600 | 101.8% | Above 80% | Above 100% | Autocalled: $6,400 + principal |\n\nTotal return: $6,400 + $19,200 + $6,400 = $32,000 on $200,000 over 15 months = 16% absolute (12.8% annualized).\n\nWhy Snowballs Are Dangerous:\n\nThe snowball mechanism creates a psychological trap: the larger the accumulated missed coupons, the more the investor hopes for recovery rather than exiting. But if the knock-in barrier is breached, the investor loses principal protection and receives depreciated shares, forfeiting all accumulated snowball coupons.\n\nIn the worst case: knock-in at 70%, index finishes at 55%. Investor receives $200,000 x (55/100) = $110,000, losing $90,000 (45%) with zero coupon income.\n\nPopularity in Asian Markets:\nSnowball notes dominate Chinese and Korean retail structured product markets because the memory feature appeals to recovery psychology. Regulators have periodically restricted issuance due to concentration risk -- a broad market decline simultaneously activates knock-in barriers across thousands of notes, creating forced selling pressure.\n\nStudy path-dependent structured products in our FRM materials.