When does the obligation to report major shareholdings arise in a takeover bid?
The part that accepts the takeover bid shall file a notification of major shareholdings as soon as possible, but no later than three trading days after the bidder discloses that it will fulfil the offer.
The same applies for the bidder, i.e. that the obligation to report major shareholdings arises when the outcome is disclosed after the acceptance period has expired.
It sounds like both parties would be required to file a notification within 3 days if GE made an offer to buy a large amount of shares from another party (Oppenhiemer, for example).