| SC 13G | 2019-02-14 | RGM Capital, LLC | COMSCORE, INC. | 4,364,820 | 7.4% | EDGAR |
| SC 13G | 2019-02-14 | Bares Capital Management, Inc. | COMSCORE, INC. | 3,516,805 | 6.0% | EDGAR |
| SC 13G | 2019-02-13 | FMR LLC | COMSCORE, INC. | 3,541,388 | 6.0% | EDGAR |
| SC 13G/A | 2019-02-08 | PRIMECAP MANAGEMENT CO/CA/ | COMSCORE, INC. | 8,645,532 | 14.7% | EDGAR |
| SC 13G/A | 2018-04-10 | PRIMECAP MANAGEMENT CO/CA/ | COMSCORE, INC. | 7,984,458 | 14.6% | EDGAR |
| SC 13D/A | 2018-04-06 | WPP plc | COMSCORE, INC. | 11,319,363 | 20.7% | EDGAR |
| SC 13G/A | 2018-02-27 | PRIMECAP MANAGEMENT CO/CA/ | COMSCORE, INC. | 6,067,932 | 10.6% | EDGAR |
| SC 13G/A | 2018-02-12 | VANGUARD GROUP INC | COMSCORE, INC. | 10 | 0.0% | EDGAR |
| SC 13D/A | 2018-01-17 | Starboard Value LP | COMSCORE, INC. | 2,793,247 | 5.0% | EDGAR |
| SC 13D | 2017-11-06 | Starboard Value LP | COMSCORE, INC. | 4,105,457 | 7.2% | EDGAR |
| SC 13G/A | 2017-03-09 | BlackRock Inc. | COMSCORE, INC. | 252,382 | 0.4% | EDGAR |
| SC 13G/A | 2017-03-06 | PRIMECAP MANAGEMENT CO/CA/ | COMSCORE, INC. | 5,980,532 | 10.6% | EDGAR |
| SC 13G/A | 2017-02-10 | VANGUARD GROUP INC | COMSCORE, INC. | 3,444,742 | 6.1% | EDGAR |
| SC 13G/A | 2017-02-09 | PRIMECAP MANAGEMENT CO/CA/ | COMSCORE, INC. | 5,628,332 | 9.9% | EDGAR |
| SC 13G/A | 2017-01-23 | BlackRock Inc. | COMSCORE, INC. | 5,344,708 | 9.4% | EDGAR |
| SC 13D/A | 2016-08-25 | WPP plc | COMSCORE, INC. | 11,174,696 | 19.5% | EDGAR |
| SC 13G/A | 2016-02-12 | PRIMECAP MANAGEMENT CO/CA/ | COMSCORE, INC. | 3,869,832 | 9.9% | EDGAR |
| SC 13G/A | 2016-02-11 | VANGUARD GROUP INC | COMSCORE, INC. | 2,531,585 | 6.5% | EDGAR |
| SC 13D/A | 2016-02-01 | WPP plc | COMSCORE, INC. | 7,021,124 | 12.4% | EDGAR |
| SC 13G/A | 2016-01-26 | BlackRock Inc. | COMSCORE, INC. | 3,499,662 | 9.0% | EDGAR |