| SC 13G/A | 2016-01-27 | BlackRock Inc. | UNION PACIFIC CORP | 52,404,761 | 6.1% | EDGAR |
| SC 13G/A | 2015-02-13 | Capital World Investors | UNION PACIFIC CORP | 35,998,500 | 4.0% | EDGAR |
| SC 13G | 2015-02-10 | VANGUARD GROUP INC | UNION PACIFIC CORP | 47,638,803 | 5.4% | EDGAR |
| SC 13G/A | 2015-01-29 | BlackRock Inc. | UNION PACIFIC CORP | 61,032,146 | 6.9% | EDGAR |
| SC 13G/A | 2014-02-13 | Capital World Investors | UNION PACIFIC CORP | 27,459,000 | 6.0% | EDGAR |
| SC 13G/A | 2014-02-04 | BlackRock Inc. | UNION PACIFIC CORP | 31,004,782 | 6.7% | EDGAR |
| SC 13G/A | 2013-02-13 | Capital Research Global Investors | UNION PACIFIC CORP | 14,945,127 | 3.2% | EDGAR |
| SC 13G/A | 2013-02-13 | Capital World Investors | UNION PACIFIC CORP | 31,999,837 | 6.8% | EDGAR |
| SC 13G/A | 2013-02-11 | BlackRock Inc. | UNION PACIFIC CORP | 26,326,105 | 5.6% | EDGAR |
| SC 13G | 2012-02-10 | Capital World Investors | UNION PACIFIC CORP | 36,731,250 | 7.6% | EDGAR |
| SC 13G/A | 2012-02-08 | BlackRock Inc. | UNION PACIFIC CORP | 26,821,265 | 5.6% | EDGAR |
| SC 13G/A | 2012-02-08 | Capital Research Global Investors | UNION PACIFIC CORP | 28,622,701 | 5.9% | EDGAR |
| SC 13G/A | 2011-02-10 | Capital Research Global Investors | UNION PACIFIC CORP | 47,437,635 | 9.6% | EDGAR |
| SC 13G/A | 2011-02-09 | BlackRock Inc. | UNION PACIFIC CORP | 27,001,621 | 5.5% | EDGAR |
| SC 13G/A | 2010-02-12 | MARSICO CAPITAL MANAGEMENT LLC | UNION PACIFIC CORP | 20,664,502 | 4.1% | EDGAR |
| SC 13G | 2010-02-10 | Capital Research Global Investors | UNION PACIFIC CORP | 40,636,535 | 8.1% | EDGAR |
| SC 13G | 2010-01-29 | BlackRock Inc. | UNION PACIFIC CORP | 27,844,161 | 5.5% | EDGAR |
| SC 13G/A | 2009-02-13 | MARSICO CAPITAL MANAGEMENT LLC | UNION PACIFIC CORP | 34,357,238 | 6.8% | EDGAR |
| SC 13G/A | 2009-02-11 | DODGE & COX | UNION PACIFIC CORP | 915,566 | 0.2% | EDGAR |
| SC 13G/A | 2009-02-03 | BARCLAYS GLOBAL INVESTORS NA /CA/ | UNION PACIFIC CORP | 15,218,357 | 3.0% | EDGAR |