FA-61753 / Options payoff and settlement / Member archive

Delta hedge order sized in lots: put deltas are treated as positive · case 03

Put positions are hedged in the wrong direction.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

Inputs positions [kind, signed contracts, absolute delta], multiplier, lot size and existing shares. Put delta is negative. Exposure = sum(sign*delta*contracts*multiplier); target shares = -exposure; the order is target - existing, rounded to whole lots with halves away from zero. Return the signed share quantity.

Why this case matters

Option expiry, exercise and settlement engines move cash and shares; a wrong branch misstates obligations.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
regression put delta sign 1	`-125`	`-175`	Failed

MEMBER ARCHIVE

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