United States Securities and Exchange Commission Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 17) John Hancock Patriot Premium Dividend Fund II (Name of Issuer) Common Stock (Title of Class of Securities) 41013T-10-5 (CUSIP Number) The Commerce Group, Inc. 211 Main Street Webster, MA 01570 (508) 943-9000 (Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications) October 13, 2005 (Date of Event which Requires Filing of this Statement) If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of Section 240.Rule 13d-1(e), 240.13d-1(f) or 240.13d- 1(g), check the following box: [X] The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes). Page 1 of 5 CUSIP No.: 41013T-10-5 THE COMMERCE GROUP, INC. SCHEDULE 13D AMENDMENT No. 17 OCTOBER 21, 2005 1. NAME OF REPORTING PERSON S.S. OR I.R.S. ID NO. OF ABOVE PERSON The Commerce Group Inc. ID# 04-2599931 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [ ] 3. SEC USE ONLY 4. SOURCE OF FUNDS [WC] 5 CHECK BOX IF DISCLOSURE OF LEGAL [ ] PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e) 6. CITIZENSHIP OR PLACE OF ORGANIZATION Massachusetts NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH SOLE VOTING POWER 5,862,900 SHARED VOTING POWER 0 SOLE DISPOSITIVE POWER 5,862,900 SHARED DISPOSITIVE POWER 0 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 5,862,900 12. CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES [ ] 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 39.0% 14. TYPE OF REPORTING PERSON [HC] Page 2 of 5 CUSIP No.: 41013T-10-5 THE COMMERCE GROUP, INC. SCHEDULE 13D AMENDMENT No. 17 OCTOBER 21, 2005 ITEM 1. SECURITY AND ISSUER This Schedule 13D relates to the shares of beneficial interest (the "Shares"), of John Hancock Patriot Premium Dividend Fund II (the "Fund"), a Massachusetts business trust registered as an investment company under the Investment Company Act of 1940, as amended (the "Investment Company Act"). The principal executive offices of the Fund are located at 101 Huntington Avenue, Boston, MA, 02119-7603. ITEM 2. IDENTITY AND BACKGROUND (a) - (f) This Schedule 13D is being filed by The Commerce Group Inc. (the "Reporting Person"), a corporation formed under the laws of Massachusetts. The Reporting Person is a corporation whose principal offices are located at 211 Main Street Webster, MA 01570. No material changes have taken place with respect to director or officer information of the Reporting Person. ITEM 3. SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION The source of the funds used by the Reporting Person to purchase shares listed in Item 5(a) was working capital. This amount of the funds used to purchase such shares reported in Annex A aggregated approximately $1,653,950.97. ITEM 4. PURPOSE OF TRANSACTION No material change has taken place since the previous filing. ITEM 5. INTEREST IN SECURITIES OF THE ISSUER (a) The Fund's reports with the Securities and Exchange Commission report that 15,046,539 Shares are outstanding. Based upon such number, the Reporting Person beneficially owns 39.0% of the Fund's outstanding Shares. (b) The Reporting Person is the beneficial owner (through its insurance subsidiary as listed below) of 5,862,900 shares, over which it has sole power of disposition and voting. Such number of Shares represents approximately 39.0% of the outstanding Shares. Shares Cost The Commerce Insurance Company 5,862,900 $64,315,639 (c) During the period from June 15, 2005 through October 13, 2005, the Reporting Person has effected the following purchases of common stock, all of which were made on the New York Stock Exchange (see attached Annex A). All transactions prior to June 15, 2005 were reported on previous Schedule 13D filings. (d) No person other than the Reporting Person has the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the shares of Common Stock owned by the Reporting Person. (e) It is inapplicable to state the date on which the Reporting Person ceased to be the beneficial owner of more than five percent of the Common Stock. Page 3 of 5 CUSIP No.: 41013T-10-5 THE COMMERCE GROUP, INC. SCHEDULE 13D AMENDMENT No. 17 OCTOBER 21, 2005 ITEM 6. CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT TO SECURITIES OF THE ISSUER The Reporting Person does not have any contract, arrangement, understanding or relationship (legal or otherwise) with any person with respect to any securities of the Fund, including, but not limited to, the transfer or voting of any such securities, finders' fees, joint ventures, loan or option arrangements, puts or calls, guarantees of profits, division of profits or loss, or the giving or withholding of proxies. ITEM 7. MATERIAL TO BE FILED AS EXHIBITS Annex A Item 5(c) Information SIGNATURE After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. October 21, 2005 THE COMMERCE GROUP INC. /s/ Gerald Fels Gerald Fels Executive Vice President & Chief Financial Officer Page 4 of 5 ANNEX A Item 5 (c) - Information PDT 41013T-10-5 JOHN HANCOCK PATRIOT DIV FUND II COMMERCE INSURANCE COMPANY PURCHASES From 06/10/05 - 10/13/05 TRADE SETTLEMENT SHARES PURCHASED PRICE ACQUISITION DATE DATE PURCHASED PER SHARE COST 06/15/2005 06/20/2005 1,000 $ 12.10 $ 12,135.00 06/20/2005 06/23/2005 2,000 12.10 24,270.00 07/29/2005 08/03/2005 6,100 12.25 74,964.73 09/15/2005 09/20/2005 16,000 11.91 191,124.80 09/15/2005 09/20/2005 9,200 11.77 108,650.16 09/16/2005 09/21/2005 12,400 11.89 147,822.00 09/20/2005 09/23/2005 5,800 11.98 69,670.76 09/21/2005 09/26/2005 1,800 11.78 21,261.96 09/22/2005 09/27/2005 1,000 11.88 11,915.00 10/05/2005 10/11/2005 6,300 11.60 73,286.64 10/06/2005 10/12/2005 800 11.66 9,356.00 10/06/2005 10/12/2005 21,000 11.60 244,335.00 10/07/2005 10/13/2005 7,600 11.51 87,751.12 10/12/2005 10/17/2005 25,000 11.38 285,372.50 10/13/2005 10/18/2005 26,500 10.99 292,035.30 Totals 142,500 $1,653,950.97 Page 5 of 5