FTSE Russell has announced that Dianomi (DNM), the London-listed native advertising technology company, will be removed from the FTSE AIM All-Share Index effective from the start of trading on 16 November 2026. The deletion is contingent on court sanctioning of a Scheme of Arrangement relating to the acquisition of Dianomi by Taboola Europe Limited. The notice, published on 9 November 2026, signals a significant structural change for investors currently holding Dianomi shares within index-tracking strategies.

Key Points

  • Dianomi plc (DNM) — London-listed native advertising technology company on AIM
  • FTSE Russell has confirmed Dianomi's deletion from the FTSE AIM All-Share Index, subject to court sanctioning of the Scheme of Arrangement
  • Constituent deletion effective from the start of trading on 16 November 2026
  • Investors should monitor court proceedings regarding the Scheme of Arrangement, which will determine whether the deletion proceeds as scheduled

FTSE Russell Confirms Dianomi's Removal from FTSE AIM All-Share Index

FTSE Russell published the constituent deletion notice on 9 November 2026, confirming that Dianomi will be removed from the FTSE AIM All-Share Index effective from the start of trading on 16 November 2026. The announcement identifies Dianomi as a UK constituent and Taboola Europe Limited as a non-constituent acquirer. The removal is described as subject to court sanctioning of the Scheme of Arrangement, meaning the deletion is conditional rather than unconditional at the time of the notice. No additional indexes beyond the FTSE AIM All-Share Index were listed as affected in the announcement.

Scheme of Arrangement with Taboola Europe Limited Drives the Index Change

The trigger for the index deletion is the proposed acquisition of Dianomi by Taboola Europe Limited via a Scheme of Arrangement, a formal court-supervised process commonly used in UK public company takeovers. Taboola Europe Limited is identified as a non-constituent of the FTSE AIM All-Share Index. Under standard FTSE Russell methodology, a constituent company ceasing to trade independently following an acquisition will be removed from the relevant index series. The announcement does not disclose the financial terms of the acquisition, the consideration payable to Dianomi shareholders, or the scheduled court hearing date.

Implications for Index-Tracking Funds Holding Dianomi Shares

Constituent deletions from the FTSE AIM All-Share Index are closely watched by passive fund managers and exchange-traded fund operators that track the index. Such funds are typically required to sell their holdings in a deleted constituent around the effective date. Investors may be watching whether any rebalancing activity affects liquidity in Dianomi shares in the days preceding 16 November 2026. The conditional nature of the deletion — dependent on court sanctioning — means investors should monitor for any further regulatory or court-related announcements from the company or its advisers ahead of that date.