SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) - May 15, 1998 HSB GROUP, INC. (Exact name of registrant as specified in its charter) Connecticut 001-13135 06-1475343 (State or other (Commission (IRS Employer jurisdiction of incorporation) File Number) Identification No.) One State Street, Hartford, Connecticut 06102-5024 (Address of principal executive offices) (Zip Code) Registrant's telephone number, including area code - (860-722-1866) Item 5. Other Events On May 15, 1998, HSB Group Inc. (the Company) issued a press release announcing the signing of a letter of intent for The Hartford Steam Boiler Inspection and Insurance Company, the Company's subsidiary, to acquire Kemper Insurance Companies' monoline boiler and machinery business and to reinsure boiler and machinery coverage written as part of Kemper's commercial package policies. Included herewith as Exhibit 99 is the Company's press release related to this announcement and such information is incorporated herein by reference. Item 7. Exhibits. 99. The Company's press release dated May 15, 1998. -2- Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. HSB GROUP, INC. Dated: May 18, 1998 /s/ R. Kevin Price R. Kevin Price Senior Vice President and Corporate Secretary -3-