<div id="readability-page-1"><div>RNS Number : 3777L BlackRock Group 12 December 2025 APPENDIX DISCLOSURE FORMIRISH TAKEOVER PANELFORM SAR 6Lodge with the Stock Exchange (which may publicise) and with the Panel.A copy must also be sent to the company the voting securities of which (or the rights over the voting securities of which) are acquired.Date of disclosure 12-12-2025DISCLOSURE UNDER RULE 6 OF THE IRISH TAKEOVER PANEL ACT, 1997, SUBSTANTIAL ACQUISITION RULES, 2007 (&#34;SARs&#34;)Date of Acquisition ...11-12-2025Acquisition in ALKERMES PLC (name of company)<div><table><tbody><tr><td>(1)</td><td>Class of voting securities (e.g. ordinary shares)</td><td>Number of voting securities/rights over voting securities acquired</td><td>If rights over voting securities acquired,as opposed to the securities themselves specifynature of rights</td></tr><tr><td></td><td>Ordinary Shares</td><td>123,095 securities with voting rights</td><td></td></tr><tr><td>(2)</td><td>Resultant total holding of rights securities (and % of total voting securities) in issue)</td><td>Resultant total holding of votingover voting securities (and % of total voting securities in issue)</td><td>Total percentage</td></tr><tr><td></td><td>28,077,480 (17.00%)</td><td></td><td>28,077,480 (17.00%)</td></tr><tr><td></td><td colspan="3"></td></tr></tbody></table></div>(3) Party making disclosure: BlackRock, Inc.(4) (a) Name of person acquiring securities or rights over securities: BlackRock, Inc.and if different, beneficial owner(b) Names of any other persons acting in concert (see SAR 3)Signed, for and on behalf of the party named in (3) above(Also print name of signatory) Jana BlumensteinTelephone and extension number: +44 0207 743 3650Note 1. Under SAR 3, the holdings of and acquisitions by persons acting in concert must be aggregated and treated as a holding of or acquisition by one person. SAR 8(b) requires persons who must aggregate holdings to disclose certain disposals.Note 2. &#34;Stock Exchange&#34;: see definition in Rule 2.1(a) of Part A of the Takeover Rules.For full details of the SARs disclosure requirements, see Rules 4, 6 and 8(b) of the SARs. If in doubt, consult the Panel.This information is provided by RNS, the news service of the London Stock Exchange. RNS is approved by the Financial Conduct Authority to act as a Primary Information Provider in the United Kingdom. Terms and conditions relating to the use and distribution of this information may apply. For further information, please contact rns@lseg.com or visit www.rns.com.RNS may use your IP address to confirm compliance with the terms and conditions, to analyse how you engage with the information contained in this communication, and to share such analysis on an anonymised basis with others as part of our commercial services. For further information about how RNS and the London Stock Exchange use the personal data you provide us, please see our Privacy Policy. END ITPVLLBFELLXFBZ</div></div>

ALKS

BlackRock Group disclosed a substantial acquisition of 123,095 ordinary shares in Alkermes PLC, resulting in a total holding of 28,077,480 shares (17.00% of total voting securities). The disclosure was made under Rule 6 of the Irish Takeover Panel Act, 1997. The acquisition date was 11-12-2025.

REG - BlackRock Group - SAR6 - ALKERMES PLC