Inventory Spike Alerts — New Sports Card Listings Rising — May 20, 2026
Fresh supply is flooding several high-heat markets today, with Giannis Antetokounmpo and Nolan Ryan seeing inventory spikes above 65% while maintaining collector interest. The pattern shows sellers responding to recent price gains in LeBron James and Patrick Mahomes II, creating potential acquisition windows as new material enters circulation. Meanwhile, Aaron Judge’s 44% price surge paired with declining inventory signals continued scarcity in his market.
Today’s inventory spike data reveals a critical divergence pattern worth monitoring closely. Giannis Antetokounmpo’s 68.7% new inventory surge paired with 14.3% price gains signals potential seller profit-taking that could pressure further appreciation, while Nolan Ryan’s 67% inventory spike alongside declining prices suggests absorption challenges in the vintage market. The contrast with Aaron Judge, whose 44.4% price jump coincides with actually declining new inventory, illustrates how supply dynamics are creating vastly different trajectories even among high-heat players.
| Player | New Inventory | Price Change | Heat Score |
|---|---|---|---|
| Giannis Antetokounmpo | +68.7% | +14.3% | 77 |
| Nolan Ryan | +67.0% | -5.0% | 55 |
| Hank Aaron | +50.5% | +15.4% | 65 |
| Rickey Henderson | +49.2% | -0.1% | 52 |
| Josh Allen | +46.0% | +0.0% | 45 |
| Stephen Curry | +35.0% | -11.1% | 45 |
| LeBron James | +34.2% | +28.6% | 75 |
| Chet Holmgren | +31.9% | +7.7% | 69 |
| Jalen Hurts | +30.0% | -9.1% | 48 |
| Walter Payton | +27.6% | +0.0% | 41 |
| Michael Jordan | +22.8% | +1.4% | 52 |
| Justin Jefferson | +22.4% | -9.2% | 34 |
| Willie Mays | +19.8% | -2.7% | 41 |
| Tom Brady | +18.2% | +31.0% | 68 |
| Patrick Mahomes II | +17.7% | +19.4% | 56 |
| Caleb Williams | +16.3% | -1.2% | 54 |
| Bobby Witt Jr. | +16.2% | -19.9% | 51 |
| Ken Griffey Jr | +15.3% | +6.0% | 64 |
| Trevor Lawrence | +14.2% | -14.3% | 50 |
| Mickey Mantle | +13.7% | +18.2% | 83 |
| Shai Gilgeous-Alexander | +12.9% | -0.1% | 51 |
| Jayden Daniels | +10.5% | -1.2% | 52 |
Featured players: Mickey Mantle, Aaron Judge, Giannis Antetokounmpo