Dimensional Fund Advisors Ltd., whose parent is Dimensional Fund Advisors LP, filed separate Rule 8.3 disclosures on August 14, 2026 during UK takeover offer periods, including for Gamma Communications PLC and Segro PLC. In the Segro filing, Dimensional reported an interest in 15,640,986 10p ordinary shares, equal to 1.16%, as of 13 August 2026, said it lacked voting discretion over 388,208 of those shares, disclosed a sale of 633 shares at 9.6760 GBP each and a transfer in of 37,642 shares, and stated it was also making disclosures in respect of Prologis Inc. In the Gamma filing, covering 0.25p ordinary shares, Dimensional disclosed a 1%-plus position, said it lacked voting discretion over 29,069 shares and disclaimed beneficial ownership of the shares described, while the source said the filing did not show a material overall holding change. The Gamma disclosure identified Investec as joint broker to Gamma, and the source also noted a separate August 13 Form 8.3 from Man Group PLC showing a reduction in a long Gamma position through cash-settled derivatives. Rule 8.3 requires holders of 1% or more of relevant securities to disclose positions and dealings publicly during an offer period.