From last week RNS24 Feb 2021 11:37
"
In accordance with Section 5 (footnote on page 11) of the FTSE UK Index Series ground rules, the free float calculation for the purposes of evaluating eligibility may include shares that would otherwise be excluded solely because they are subject to a lock-in clause which expires within 12 months of the first day of trade. Therefore, and contingent on maintaining a Premium listing and satisfying all other eligibility criteria, Harbour Energy will remain included within the FTSE UK Index Series while the expiration of the lock-in agreements and associated changes to the free float are monitored and reviewed in conjunction with the quarterly review process for 12 months from the first day of trading of Harbour Energy.
For the avoidance of doubt, the additional shares issued during the combination will be reviewed for inclusion at the June 2021 quarterly review, with the enlarged market capitalisation first included within the FTSE UK Index Series ranking at the September 2021 quarterly review.
"
So it looks like the enlarged shares will not be included until June atleast as they say that they will review for inclusion in June? Does that mean that on April 1st, the only shares in the new group(HE) would be the PMO shares? Also they say that 12 months lock-in is from first day of the trade so if the enlarged shares are not included before September then lock-in should not apply from April 1st whereas in the above excerpt from RNS, lock-in is from first day of HE trading, which is April 1st.