A Central Index Key (CIK) is a unique identifier assigned by the SEC to each filer.

Why are some filings missing?

New filings appear as the SEC updates EDGAR, and older records can vary by availability.

How often is this page updated?

Updates follow new EDGAR submissions and periodic data refreshes.

SEC EDGAR filings, ownership reports, and insider transactions for HANOVER INSURANCE CO, THE.

HANOVER INSURANCE CO, THE has filed 6 SEC EDGAR filings since 07 Feb 2018

Recent SEC filings for HANOVER INSURANCE CO, THE including 13F-NT, SC 13G.

Form type	Document	Filing	Description	Filing date	Reporting date	File number(s)
13F-NT	Open 13F-NT document	View SEC filing for 13F-NT		12 Feb 2026	31 Dec 2025	028-24961
13F-NT	Open 13F-NT document	View SEC filing for 13F-NT		10 Nov 2025	30 Sep 2025	028-24961
13F-NT	Open 13F-NT document	View SEC filing for 13F-NT		12 Aug 2025	30 Jun 2025	028-24961
13F-NT	Open 13F-NT document	View SEC filing for 13F-NT		14 May 2025	31 Mar 2025	028-24961
13F-NT	Open 13F-NT document	View SEC filing for 13F-NT		11 Feb 2025	31 Dec 2024	028-24961
SC 13G	Open SC 13G document	View SEC filing for SC 13G	13G DATED 2-7-18 FOR SIG GUFF SMALL BUSINESS CREDIT OPP, INC. AND THE HANOVER LI	07 Feb 2018

HANOVER INSURANCE CO, THE files with the SEC under CIK 0000045403. This page aggregates EDGAR filings and related ownership activity.

What is a CIK?: A Central Index Key (CIK) is a unique identifier assigned by the SEC to each filer.
Why are some filings missing?: New filings appear as the SEC updates EDGAR, and older records can vary by availability.
How often is this page updated?: Updates follow new EDGAR submissions and periodic data refreshes.