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- 3 Feb 22 NORTHROP GRUMMAN / Mary D Petryszyn ownership change
- 4 Jan 22 NORTHROP GRUMMAN / KARL J KRAPEK ownership change
- 4 Jan 22 NORTHROP GRUMMAN / Marianne Catherine Brown ownership change
- 4 Jan 22 NORTHROP GRUMMAN / Blake E Larson ownership change
- 9 Dec 21 NORTHROP GRUMMAN / Mark A Caylor ownership change
- 8 Dec 21 NORTHROP GRUMMAN / Mark A Caylor ownership change
- 15 Nov 21 NORTHROP GRUMMAN / KARL J KRAPEK ownership change
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