A private company’s headline valuation is a number it agreed with its lead investor at a moment in time. This is the other number: the implied per-share price in the secondary market — what someone paid to buy those shares from an existing holder — set against the last primary round price. The gap between the two is the market either validating a mark or refusing to pay it.
A median tells you the centre; these tell you the distribution behind it — whether a market-wide markdown is broad or driven by a distressed tail, and which sectors the discount concentrates in.
Every private company with an observed secondary trade — search by company or sector, and open any name for its full profile. Companies QuantLogix tracks that have no secondary print are not listed here; they live in the private-company directory.