The FMP holder-analytics query requires a ticker, year and quarter. It starts at page 0 with 10 rows by default and returns at most 50 rows per call. Ask for more pages before ranking holders across the dataset; there is no sort parameter that guarantees the first page contains the largest holders.
Institutional filings are delayed snapshots. A higher market value can reflect a price move as well as a change in shares, and a portfolio-weight change can be caused by activity elsewhere in the holder’s portfolio. The records do not reveal trade timing or investment intent.