| SC 13G | 2021-10-13 | INTEGRATED CORE STRATEGIES (US) LLC | STAMPS.COM INC | - | 0.0% | EDGAR |
| SC 13G/A | 2021-04-16 | VANGUARD GROUP INC | STAMPS.COM INC | 1,949,152 | 10.7% | EDGAR |
| SC 13G/A | 2021-02-16 | D. E. SHAW & CO, L.P. | STAMPS.COM INC | 483,068 | 2.6% | EDGAR |
| SC 13G/A | 2021-02-10 | VANGUARD GROUP INC | STAMPS.COM INC | 1,949,152 | 10.7% | EDGAR |
| SC 13G | 2021-01-25 | BlackRock Inc. | STAMPS.COM INC | 2,820,437 | 15.5% | EDGAR |
| SC 13G/A | 2020-02-14 | Okumus Fund Management Ltd. | STAMPS.COM INC | 679,169 | 4.0% | EDGAR |
| SC 13G/A | 2020-02-14 | D. E. SHAW & CO, L.P. | STAMPS.COM INC | 690,065 | 4.0% | EDGAR |
| SC 13G/A | 2020-02-12 | VANGUARD GROUP INC | STAMPS.COM INC | 1,753,650 | 10.3% | EDGAR |
| SC 13G | 2020-02-06 | Fisher Asset Management, LLC | STAMPS.COM INC | 1,079,633 | - | EDGAR |
| SC 13G/A | 2020-02-04 | BlackRock Inc. | STAMPS.COM INC | 2,491,293 | 14.6% | EDGAR |
| SC 13G/A | 2019-11-18 | D. E. SHAW & CO, L.P. | STAMPS.COM INC | 858,276 | 5.0% | EDGAR |
| SC 13G/A | 2019-10-15 | D. E. SHAW & CO, L.P. | STAMPS.COM INC | 874,537 | 5.1% | EDGAR |
| SC 13G | 2019-07-05 | D. E. SHAW & CO, L.P. | STAMPS.COM INC | 887,714 | 5.1% | EDGAR |
| SC 13G/A | 2019-06-10 | FMR LLC | STAMPS.COM INC | 3,014 | 0.0% | EDGAR |
| SC 13G | 2019-05-15 | Okumus Fund Management Ltd. | STAMPS.COM INC | 949,700 | 5.5% | EDGAR |
| SC 13G/A | 2019-03-11 | VANGUARD GROUP INC | STAMPS.COM INC | 1,763,020 | 10.0% | EDGAR |
| SC 13G/A | 2019-02-13 | FMR LLC | STAMPS.COM INC | 977,540 | 5.4% | EDGAR |
| SC 13G/A | 2019-02-11 | VANGUARD GROUP INC | STAMPS.COM INC | 1,743,769 | 9.6% | EDGAR |
| SC 13G/A | 2019-01-31 | BlackRock Inc. | STAMPS.COM INC | 2,633,238 | 14.5% | EDGAR |
| SC 13G/A | 2018-09-10 | FMR LLC | STAMPS.COM INC | 1,322,988 | 7.3% | EDGAR |