We count every public completed card sale we can see, every day, and publish two things from it. The first is a weekly index: what share of all card sales a fixed group of players holds, measured against the whole market rather than against itself.
Groups are fixed before any week is measured. That matters, because picking the biggest mover out of hundreds of players mostly finds the luckiest one rather than a real change. A group that was chosen in advance cannot be selected after the fact.
Two groups are published so far. Retired NBA players are eleven names including Michael Jordan, Kobe Bryant and Shaquille O'Neal. Active NBA players are six names including LeBron James, Stephen Curry and Victor Wembanyama. Since late May 2026 the retired group has gained share of the market while the active group has lost it.
Every value is published with the range you get by leaving any one player out. A narrow range means the group moved together. A wide one means a single player is carrying the number, which is a different and much weaker claim.
A week is only published once all seven of its days have arrived. A short week would make every share in it read high, so it is dropped rather than shown.
The second thing we publish is reports on individual players. The first asks why Shaquille O'Neal's cards started selling in far greater numbers from 27 July 2026, and finds that the same card in the same condition also sells for about sixty percent more. We could not identify a cause.
These are counts of sales, not appraisals or investment advice.