Form SC 13G GAMCO INVESTORS, INC. Filed by: CASCADE INVESTMENT, L.L.C.

SCHEDULE 13G

Under the Securities Exchange Act of 1934
(Amendment No.      )*

(Name of Issuer)

(Title of Class of Securities)

(CUSIP Number)

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

*The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in 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).

(1) All shares of Class A Common Stock, $.001 par value (the “Common Stock”), of GAMCO Investors, Inc. (the “Issuer”) held by Cascade Investment, L.L.C. (“Cascade”) may be deemed to be beneficially owned by William H. Gates III as the sole member of Cascade. 

(2) Based on (a) 10,554,066 shares of the Issuer’s Common Stock outstanding as of August 15, 2016 based on information provided by the Issuer in Exhibit 10.1 to the Issuer’s Form 8-K filed on August 16, 2016; and (b) 2,000,000 shares of Common Stock issuable by the Issuer pursuant to the terms of a convertible promissory note due 2021, as described in Item 4(a), footnote 1 of this Schedule 13G.

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(1) All shares of Class A Common Stock, $.001 par value (the “Common Stock”), of GAMCO Investors, Inc. (the “Issuer”) held by Cascade Investment, L.L.C. (“Cascade”)  may be deemed to be beneficially owned by William H. Gates III as the sole member of Cascade. 

(2) Based on (a) 10,554,066 shares of the Issuer’s Common Stock outstanding as of August 15, 2016 based on information provided by the Issuer in Exhibit 10.1 to the Issuer’s Form 8-K filed on August 16, 2016; and (b) 2,000,000 shares of Common Stock issuable by the Issuer pursuant to the terms of a convertible promissory note due 2021, as described in Item 4(a), footnote 1 of this Schedule 13G. 

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(1) The shares of the Class A Common Stock $.001 par value (the “Common Stock”), of GAMCO Investors, Inc. (the “Issuer”) that are the subject of this Schedule 13G are issuable by the Issuer pursuant to the terms of a convertible promissory note due 2021 (the “Note”) purchased by Cascade Investment, L.L.C. (“Cascade”)  in the aggregate principal amount of $110,000,000 pursuant to a note purchase agreement, dated as of August 15, 2016, by and among Cascade, the Issuer, Mario J. Gabelli and GGCP, Inc. The Note bears interest at a rate of 4.5% per annum and is convertible into shares of Common Stock at an initial conversion price of $55.00 per share, subject to certain adjustments.

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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.

(1)         Duly authorized under Special Limited Power of Attorney appointing Alan Heuberger attorney-in-fact, dated October 11, 2013, by and on behalf of Michael Larson, attached hereto as Exhibit 99.2.

(2)         Duly authorized under Special Limited Power of Attorney appointing Alan Heuberger attorney-in-fact, dated August 12, 2008, by and on behalf of William H. Gates III, attached hereto as Exhibit 99.3.

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Exhibit 99.1

JOINT FILING AGREEMENT

We, the signatories of the statement to which this Joint Filing Agreement is attached, hereby agree that such statement is filed, and any amendments thereto filed by either or both of us will be filed, on behalf of each of us.

(1)         Duly authorized under Special Limited Power of Attorney appointing Alan Heuberger attorney-in-fact, dated October 11, 2013, by and on behalf of Michael Larson, attached hereto as Exhibit 99.2.

(2)         Duly authorized under Special Limited Power of Attorney appointing Alan Heuberger attorney-in-fact, dated August 12, 2008, by and on behalf of William H. Gates III, attached hereto as Exhibit 99.3.

Exhibit 99.2

Special Limited Power Of Attorney

The undersigned, Michael Larson, does hereby constitute and appoint Alan Heuberger and Mike Rodden, and each of them, with full power to act without the other, as attorneys-in-fact, on behalf of the undersigned and in the undersigned’s name, place and stead, to execute, acknowledge, deliver and/or file any documents or filings and any amendments thereto made by or on behalf of the undersigned in respect of any securities held by him, directly, indirectly or beneficially, or required in connection with his position as a director, officer, manager or security holder of any entity under any laws, rules or regulations of any pertinent jurisdiction or any relevant securities market or exchange.  The undersigned acknowledges that the foregoing attorneys-in-fact, in serving in such capacity, are not assuming any of the undersigned’s responsibilities to comply with such laws.

This Special Limited Power of Attorney shall remain in full force and effect with respect to each foregoing attorneys-in-fact until withdrawn by the undersigned by written notice to such attorneys-in-fact.

IN WITNESS WHEREOF, the undersigned has caused this Special Limited Power of Attorney to be executed as of this 11th day of October, 2013.

I certify that I know or have satisfactory evidence that Michael Larson is the person who appeared before me, and said person acknowledged that he signed this instrument as his free and voluntary act for the uses and purposes mentioned in the instrument.

Dated:  October 11, 2013

Exhibit 99.3

Special Limited Power Of Attorney

The undersigned, Michael Larson, pursuant to lawfully granted authority by the principal, William H. Gates III hereby appoints Alan Heuberger with full power to act as attorney-in-fact, on behalf of Mr. Gates and in his name, place and stead, to execute, acknowledge, deliver and/or file any documents or filings and any amendments thereto made by or on behalf of Mr. Gates in respect of any securities held by him, directly, indirectly or beneficially, or required in connection with his position as a director or officer of any entity, with the Securities and Exchange Commission, including, without limitation:  (i) Schedules 13D ,13G and 13F pursuant to Section 13 of the Securities Exchange Act of 1934 (the “Act”) and (ii) Forms 3, 4 and 5 pursuant to Section 16 of the Act.  The undersigned acknowledges that the foregoing attorney-in-fact, in serving in such capacity, is not assuming any of Mr. Gates’ responsibilities to comply with such laws.

This Special Limited Power of Attorney shall remain in full force and effect with respect to the foregoing attorney-in-fact until withdrawn by the undersigned or Mr. Gates by written notice to the foregoing attorney-in-fact.

Nothing herein is intended to destroy or alter the rights of the undersigned to also act as attorney-in-fact for Mr. Gates under any Power of Attorney separately granted to the undersigned by Mr. Gates.

IN WITNESS WHEREOF, the undersigned has caused this Special Limited Power of Attorney to be executed as of this 12th day of August, 2008.

I certify that I know or have satisfactory evidence that Michael Larson is the person who appeared before me, and said person acknowledged that he signed this instrument as his free and voluntary act for the uses and purposes mentioned in the instrument.

Dated:  August 12, 2008