A forming assembly for forming a plurality of sealed packs starting from a tube of packaging material, comprising first conveying means (14b, 15b, 14b') movable along an endless first path; said first path comprising, in turn, proceeding according to the advancing direction of said first conveying means (14b, 15b, 14b'): - a first operative branch, which has a main elongation direction parallel to an advancing direction of said tube; and - a first return branch comprising, in turn, an initial portion which is arranged immediately downstream of said operative branch and extends transversally to said advancing direction; said first conveying means (14b, 15b, 14b') comprising, in turn: - one of a sealing element or a counter-sealing element adapted to seal said pack along said first operative branch; and - a first half-shell (21b, 21b'), which is movable along said operative branch between: a first rest position, in which it is detached, in use, from said tube or said formed pack; and a first operative position, in which it grips said tube or said formed pack; said first half-shell (21b, 21b') being arranged in said first operative position along a first portion of said first operative branch; characterized in that said first half-shell (21b, 21b') is configured to be kept, in use, in said first operative position along said initial portion, so as to grip and convey said pack in a staggered position with respect to said advancing direction; and is configured to move, in use, from said first operative position to said rest position at an end of said initial portion opposite to said first portion, so as to discharge said pack in a staggered position with respect to said advancing direction. - a first operative branch, which has a main elongation direction parallel to an advancing direction of said tube; and - a first return branch comprising, in turn, an initial portion which is arranged immediately downstream of said operative branch and extends transversally to said advancing direction; - one of a sealing element or a counter-sealing element adapted to seal said pack along said first operative branch; and - a first half-shell (21b, 21b'), which is movable along said operative branch between: a first rest position, in which it is detached, in use, from said tube or said formed pack; and a first operative position, in which it grips said tube or said formed pack; said first half-shell (21b, 21b') being arranged in said first operative position along a first portion of said first operative branch; characterized in that said first half-shell (21b, 21b') is configured to be kept, in use, in said first operative position along said initial portion, so as to grip and convey said pack in a staggered position with respect to said advancing direction; and is configured to move, in use, from said first operative position to said rest position at an end of said initial portion opposite to said first portion, so as to discharge said pack in a staggered position with respect to said advancing direction. a first rest position, in which it is detached, in use, from said tube or said formed pack; and a first operative position, in which it grips said tube or said formed pack; said first half-shell (21b, 21b') being arranged in said first operative position along a first portion of said first operative branch; characterized in that said first half-shell (21b, 21b') is configured to be kept, in use, in said first operative position along said initial portion, so as to grip and convey said pack in a staggered position with respect to said advancing direction; and is configured to move, in use, from said first operative position to said rest position at an end of said initial portion opposite to said first portion, so as to discharge said pack in a staggered position with respect to said advancing direction.