get_insider_positions_by_ticker

Get per-insider position aggregates for a given ticker — which insiders hold positions in the stock and their aggregate cost/value. Derived from Form 4 filings. NOT LIFETIME: every figure covers only the Form 4 history Signal8 holds, which starts at the response's coverageStart date (also repeated on each row) — say "since <coverageStart>", never "lifetime" or "all-time".

Each row carries costBasisStatus: complete (every share the history knows was bought inside coverage), partial (the holding predates coverage, so weightedAvgCost averages only in-coverage priced buys and is NOT the cost of the position), or unknown (the first in-coverage event was a sale, or there was no priced buy — weightedAvgCost/costBasisTotal are null, which means NOT MEASURED, never zero cost).