Bullish Case: ARWR is down 28% in a month yet theHelium density peaks near $60–$62.5 and AI forecast is +4.7% — a mean-reversion snapback is the base case. Today's ARO-MAPT Alzheimer's webinar (BBB penetration, deep tau knockdown) is a fresh catalyst; strong interim data could rapidly re-rate the platform, and call flow (28% above puts) plus 31% bullish-skewed risk support a bounce toward $62–$68.

Bearish Case: The term structure is in backwardation (near-term IV ~110% vs ~54% in Nov–Mar), signaling the market expects a binary event now — the ARO-MAPT webinar can disappoint: early AD trials rarely move, healthy-volunteer data won't validate efficacy, and tau knockdown ≠ clinical benefit. The -12% five-year return and heavy $57.50 put positioning show downside momentum can persist toward $50–$52.5.

Potential Outcomes:

1. Webinar data impresses; bounce to $62–$68 — 30% (Helium density peak $60–$62.5; falsify if close < $57 within a week)
2. Muted reaction; mean-revert range $55–$60 — 35% (historical surface mass near small moves; falsify if IV stays >90% with no drift)
3. Data underwhelms; slide to $50–$54 — 22% (backwardation + rich put skew; falsify if $57.50 puts collapse in value)
4. Large move ±20%+ (platform re-rate or setback/partnership) — 13% (fat tails in return surface; low option volume, 15th pct, makes these fragile)

October 14, 2026