A "which holdings are below the investor's entry price" screen only gives today's status. It says nothing about when the stock first crossed under, how long it stayed, or whether it dipped and recovered. Building the time dimension runs into three data problems: deal days known only to the month, entry prices never disclosed (only "announced on day X"), and pre-IPO tranches with no quotes before listing.

You want to find companies currently valued below what large strategic corporate investors paid for their stakes. Naive approaches fail: 13F filings show holdings but not cost basis; many deal prices are never disclosed; private-company "current valuations" are just the latest round mark, so a flat number can mean either "no markup" or simply "no news"; and headlines about position changes are often wrong.