| SC 13G | 2013-02-14 | WELLINGTON MANAGEMENT CO LLP | KBR, INC. | 14,394,336 | 9.8% | EDGAR |
| SC 13G/A | 2013-02-13 | Capital World Investors | KBR, INC. | 8,472,289 | 5.7% | EDGAR |
| SC 13G | 2013-02-13 | GROWTH FUND OF AMERICA INC | KBR, INC. | 9,401,289 | 6.4% | EDGAR |
| SC 13G/A | 2013-02-11 | WELLINGTON MANAGEMENT CO LLP | KBR, INC. | 19,894,471 | 13.5% | EDGAR |
| SC 13G/A | 2013-01-11 | BlackRock Inc. | KBR, INC. | 17,705,740 | 12.0% | EDGAR |
| SC 13G/A | 2012-10-10 | BlackRock Inc. | KBR, INC. | 15,393,206 | 10.4% | EDGAR |
| SC 13G/A | 2012-06-11 | FMR LLC | KBR, INC. | 1,359,776 | 0.9% | EDGAR |
| SC 13G | 2012-02-14 | FMR LLC | KBR, INC. | 9,003,695 | 6.0% | EDGAR |
| SC 13G/A | 2012-02-13 | BlackRock Inc. | KBR, INC. | 11,878,465 | 8.0% | EDGAR |
| SC 13G/A | 2012-02-10 | Capital World Investors | KBR, INC. | 9,571,790 | 6.4% | EDGAR |
| SC 13G/A | 2011-02-14 | FMR LLC | KBR, INC. | 14,447,691 | 9.6% | EDGAR |
| SC 13G/A | 2011-02-14 | Capital World Investors | KBR, INC. | 9,661,790 | 6.4% | EDGAR |
| SC 13G/A | 2011-02-10 | FMR LLC | KBR, INC. | 5,938,791 | 3.9% | EDGAR |
| SC 13G/A | 2011-02-07 | BlackRock Inc. | KBR, INC. | 13,204,515 | 8.8% | EDGAR |
| SC 13G/A | 2010-12-10 | Capital World Investors | KBR, INC. | 9,831,790 | 6.5% | EDGAR |
| SC 13G | 2010-06-10 | FMR LLC | KBR, INC. | 22,073,376 | 13.7% | EDGAR |
| SC 13G/A | 2010-02-11 | Capital World Investors | KBR, INC. | 19,273,920 | 12.0% | EDGAR |
| SC 13G | 2010-01-29 | BlackRock Inc. | KBR, INC. | 13,880,059 | 8.7% | EDGAR |
| SC 13G/A | 2009-02-17 | JANA PARTNERS LLC | KBR, INC. | 0 | 0.0% | EDGAR |
| SC 13G/A | 2009-02-13 | Capital World Investors | KBR, INC. | 20,263,920 | 12.5% | EDGAR |