Avidia Bancorp, Inc.

AVBC·NYSE·$19.06Share Price as of 11/2·$383MMarket Cap as of 11/2

Financials

10-QQ2 ended 06/30/2608/13/26 10-QQ1 ended 03/31/2605/14/26 10-KFY 202503/27/26 10-QQ3 ended 09/30/2511/14/25 10-QQ2 ended 06/30/2508/14/25

Disclosures

8-KCurrent report10/23/26 8-K/ACurrent report (amended)09/16/26 8-KCurrent report09/15/26 8-KCurrent report08/04/26 8-KCurrent report07/27/26

Prospectuses and Registrations

S-8Registration of securities for employees09/16/26 S-8Registration of securities for employees08/01/25 424B3Prospectus05/21/25 424B3Prospectus05/21/25 S-1/ARegistration statement (amended)05/06/25

Proxies

DEF 14ADefinitive proxy08/07/26

Ownership

Form 4Insider transaction10/15/26 Form 4Insider transaction10/15/26 Form 4Insider transaction10/15/26 Form 4Insider transaction10/15/26 Form 4Insider transaction10/15/26

Other

11-KEmployee stock purchase plan report06/29/26 8-A12B8-A12B07/31/25 CERTCEO/CFO certification07/31/25 EFFECTRequest for effectiveness05/13/25 CORRESPCorrespondence with the SEC05/09/25