0002058758 2025-08-01 2025-08-01 0002058758 1 2025-08-01 2025-08-01 0002058758 2 2025-08-01 2025-08-01 iso4217:USD pure shares S-8 S-8 EX-FILING FEES 0002058758 Avidia Bancorp, Inc. false false S-8 Avidia Bancorp, Inc. Equity Common stock, $0.01 par value per share true 4920964 10.00 49209640.00 0.0001531 7534.00 Other Participation Interests true 0.0001531 0.00 49209640.00 7534.00 0.00 7534.00 This registration statement relates to 4,920,964 shares of common stock of Avidia Bancorp, Inc. that may be purchased with employee contributions to the 401(k) Plan as Adopted by Avidia Bank (the "Plan"). The Proposed Maximum Offering Price per unit is determined pursuant 17 C.F.R. Sections 230.457(h)(1) and 230.457(c) of the Securities Act. Pursuant to 17 C.F.R. Section 230.416(c) under the Securities Act of 1933, as amended (the "Securities Act"), this registration statement also covers an indeterminate amount of participation interests to be offered or sold pursuant to the Plan. Pursuant to 17 C.F.R. Section 230.457(h)(2) of the Securities Act, no registration fee is required to be paid.