Analyst trims 10-15% of PLTR at $172 to lock in gains from the 37% four-day rally, while trailing the remaining 85-90% core position with a close-minus-2x-ATR stop around $154 and hard invalidation below $146. Fresh capital is reserved for phased re-entry into the $155-165 zone rather than waiting for the $146 retest, with upgrade to Hold recommended only if price sustains above $185 on strong volume.