An apparatus for forming completed packs (122, 124) containing a desired number of folded sheets formed in a stacking region below a pair of folding rolls (130, 132) along a sheet path extending through a nip between the pair of folding rolls (130, 132) by a continuously flowing sheet stream of folded sheets issuing downstream from the pair of folding rolls (130, 132) along the sheet path and having adjacent panels forming successive folds opening alternately in opposite directions substantially transversely to the sheet path, the apparatus comprising: a pack build and transport arrangement for receiving the folded panels in the stacking region to form the completed pack, and for transporting the completed packs out of the stacking region; and first and second count fingers (104, 106) operatively configured and connected to the pack build and transport arrangement for periodic pivotable motion about respective first and second count finger axes (142, 146) into successive oppositely opening folds to form a completed pack downstream from the count fingers (104, 106); characterised by the count fingers (104, 106) also being operatively configured and connected to the pack build and transport arrangement for movement of the count finger axes (142, 146) in a downstream direction while continuing to partly build the next pack on upstream surfaces of the count fingers (104, 106) as the pack build and transport arrangement moves the completed pack out of the stacking region; the count fingers (104, 106) further being operatively configured and connected to the pack build and transport arrangement for retracting the count fingers (104, 106), by moving them substantially linearly oppositely from one another outward from the sheet path, to transfer the partly completed next pack from the count fingers (104, 106) to the pack build and transport arrangement after the pack build and transport arrangement has transported the previously completed pack out of the stacking region. a pack build and transport arrangement for receiving the folded panels in the stacking region to form the completed pack, and for transporting the completed packs out of the stacking region; and first and second count fingers (104, 106) operatively configured and connected to the pack build and transport arrangement for periodic pivotable motion about respective first and second count finger axes (142, 146) into successive oppositely opening folds to form a completed pack downstream from the count fingers (104, 106); characterised by the count fingers (104, 106) also being operatively configured and connected to the pack build and transport arrangement for movement of the count finger axes (142, 146) in a downstream direction while continuing to partly build the next pack on upstream surfaces of the count fingers (104, 106) as the pack build and transport arrangement moves the completed pack out of the stacking region; the count fingers (104, 106) further being operatively configured and connected to the pack build and transport arrangement for retracting the count fingers (104, 106), by moving them substantially linearly oppositely from one another outward from the sheet path, to transfer the partly completed next pack from the count fingers (104, 106) to the pack build and transport arrangement after the pack build and transport arrangement has transported the previously completed pack out of the stacking region.