SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D/A

(RULE 13d-101)

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO

§ 204.13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO

§240.13d-2(a)

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Amendment No. 3

Artisan Partners Asset Management Inc.

(Name of Issuer)

Class A Common Stock, $0.01 par value per share

(Title of Class of Securities)

04316A-108

(CUSIP Number)

Sarah A. Johnson

875 E. Wisconsin Ave., Suite 800

Milwaukee, WI 53202

(414) 390-6100

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

March 9, 2015

(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 §§240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.  ¨

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About this Amendment No. 3

This Amendment No. 3 to Schedule 13D (“Amendment No. 3”) amends the statement on Schedule 13D relating to the Class A common stock of the Company filed by the Reporting Persons with the Securities and Exchange Commission on March 12, 2014, as amended (the “Original Schedule 13D”). Capitalized terms used in this Amendment No. 3 but not otherwise defined herein have the meanings given to them in the Original Schedule 13D.

This Amendment No. 3 is being made to reflect a reduction in the number of shares subject to the Stockholders Agreement described in the Original Schedule 13D, including the cancellation by the Company of shares of Class B common stock that are subject to that agreement and a decrease in the percentages deemed to be beneficially owned by the Reporting Persons as a result. This Amendment No. 3 also reflects a decrease in the number of shares of Class B common stock over which Mr. Colson and Mr. Daley have sole dispositive power. Except as otherwise set forth herein, this Amendment No. 3 does not modify any of the information previously reported by the Reporting Persons in the Original Schedule 13D.

Item 5. Interest in Securities of the Issuer

(a) – (b)

As of March 9, 2015, 3,554,032 shares of Class A common stock of the Company and 18,423,760 shares of Class B common stock of the Company are subject to the Stockholders Agreement. Those shares, in the aggregate, represent approximately 65.0% of the combined voting power of the Company’s outstanding common stock. Each of the Reporting Persons is a member of the three-person Stockholders Committee that has the power to vote the shares subject to the Stockholders Agreement. As a result, each of the Reporting Persons may be deemed to have acquired beneficial ownership of all shares subject to the Stockholders Agreement. Each of the Reporting Persons disclaims beneficial ownership of all shares subject to the agreement, except for those shares with respect to which each Reporting Person, respectively, possesses sole dispositive power as noted below. The Stockholders Agreement is described in greater detail in, and filed as an exhibit to, the Original Schedule 13D.

The percentages in the column titled Percentage of Outstanding Class A Common Stock are calculated in accordance with Rule 13d-3(d)(1)(i) and thereby represent each Reporting Person’s aggregate number of shares of Class A common stock beneficially owned, divided by the sum of the total number of outstanding shares of Class A common stock and the number of shares of Class A common stock that would be issued upon exchange of the shares of Class B common stock deemed to be beneficially owned by the Reporting Person. Each share of Class B common stock corresponds to a Class B common unit of Holdings, which, together with the corresponding Class B common unit, is exchangeable for one share of Class A common stock, subject to certain restrictions and conditions.

(c) On March 9, 2015, the Company closed an offering of 3,831,550 shares of its Class A common stock. The Company used all of the proceeds of the offering to repurchase 3,851,550 common units of Holdings. The 2,415,413 shares of Class B common stock and 1,416,297 shares of Class C common stock corresponding to the common units were cancelled. All of the shares of Class B common stock cancelled had been subject to the Stockholders Agreement prior to cancellation. As part of these transactions, the Company purchased 117,841 and 23,882 Class B common units (and cancelled the corresponding shares of Class B common stock) from Mr. Colson and Mr. Daley, respectively. The purchase price per unit was $46.08, which equaled the per share proceeds received by the Company from the offering.

(d) Except for the shares listed in the column titled Sole Power to Dispose, persons other than the Reporting Persons have the power to direct the receipt of dividends from, or the proceeds from the sale of, the shares listed in the column titled Aggregate Number of Shares of Class A Common Stock Beneficially Owned. The information set forth under Item 3 and Item 6 of the Original Schedule 13D is hereby incorporated by reference.

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Item 7. Material to Be Filed as Exhibits.

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SIGNATURES

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.

Dated: March 10, 2015

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Exhibit 99.1

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree to the joint filing on behalf of each of them a statement on Schedule 13D (including amendments thereto) with respect to shares of Class A common stock, par value $0.01 per share, of Artisan Partners Asset Management Inc., and further agree that this Joint Filing Agreement be included as an exhibit to such joint filing. This Joint Filing Agreement may be executed in any number of counterparts all of which taken together shall constitute one and the same instrument.

IN WITNESS WHEREOF, the undersigned hereby duly execute this Joint Filing Agreement this 20th day of February, 2015.

Dated: February 20, 2015

Exhibit 99.2

POWER OF ATTORNEY

The undersigned, Eric R. Colson, hereby appoints Sarah A. Johnson, Samuel B. Sellers, and Lisa A. Moran, and each of them individually, its true and lawful attorney-in-fact and agent, with full power to execute and file with the United States Securities and Exchange Commission and any stock exchange or similar authority, for and on its behalf in any and all capacities, any and all reports required to be filed pursuant to Section 13 of the Securities Exchange Act of 1934 and the rules thereunder, including but not limited to reports on Schedule 13D or 13G, any and all amendments to such reports, with all exhibits, and any other forms or documents as may be necessary in connection with the filing of such reports with the United States Securities and Exchange Commission and any stock exchange or similar authority, granting unto said attorney full power and authority to do and perform any and all acts for and on behalf of the undersigned which may be necessary or desirable to complete, as fully as the undersigned might or could do in person.

This Power of Attorney shall remain in full force and effect until revoked by the undersigned in a signed writing delivered to the foregoing attorneys-in-fact and agents.

IN WITNESS WHEREOF the undersigned has caused this Power of Attorney to be executed this 10^th day of March, 2014.

STATE OF CALIFORNIA                )

                                                             ) SS.

COUNTY OF SAN FRANCISCO    )

I, Ferial Randera, a Notary Public in and for the County of San Francisco, State of California, DO HEREBY CERTIFY that Eric R. Colson, who is personally known to me to be the same person whose name is subscribed to the foregoing instrument, appeared before me this day in person and acknowledged that he signed and delivered the said instrument as his own free and voluntary act, for the uses and purposes therein set forth.

Given under my hand and notarial seal, this 10^th day of March, 2014.

Exhibit 99.3

POWER OF ATTORNEY

The undersigned, Charles J. Daley, Jr., hereby appoints Sarah A. Johnson, Samuel B. Sellers, and Lisa A. Moran, and each of them individually, its true and lawful attorney-in-fact and agent, with full power to execute and file with the United States Securities and Exchange Commission and any stock exchange or similar authority, for and on its behalf in any and all capacities, any and all reports required to be filed pursuant to Section 13 of the Securities Exchange Act of 1934 and the rules thereunder, including but not limited to reports on Schedule 13D or 13G, any and all amendments to such reports, with all exhibits, and any other forms or documents as may be necessary in connection with the filing of such reports with the United States Securities and Exchange Commission and any stock exchange or similar authority, granting unto said attorney full power and authority to do and perform any and all acts for and on behalf of the undersigned which may be necessary or desirable to complete, as fully as the undersigned might or could do in person.

This Power of Attorney shall remain in full force and effect until revoked by the undersigned in a signed writing delivered to the foregoing attorneys-in-fact and agents.

IN WITNESS WHEREOF the undersigned has caused this Power of Attorney to be executed this 10^th day of March, 2014.

I, Ferial Randera, a Notary Public in and for the County of San Francisco, State of California, DO HEREBY CERTIFY that Charles J. Daley, Jr., who is personally known to me to be the same person whose name is subscribed to the foregoing instrument, appeared before me this day in person and acknowledged that he signed and delivered the said instrument as his own free and voluntary act, for the uses and purposes therein set forth.

Given under my hand and notarial seal, this 10^th day of March, 2014.

Exhibit 99.4

POWER OF ATTORNEY

The undersigned, Gregory K. Ramirez, hereby appoints Sarah A. Johnson, Samuel B. Sellers, and Lisa A. Moran, and each of them individually, its true and lawful attorney-in-fact and agent, with full power to execute and file with the United States Securities and Exchange Commission and any stock exchange or similar authority, for and on its behalf in any and all capacities, any and all reports required to be filed pursuant to Section 13 of the Securities Exchange Act of 1934 and the rules thereunder, including but not limited to reports on Schedule 13D or 13G, any and all amendments to such reports, with all exhibits, and any other forms or documents as may be necessary in connection with the filing of such reports with the United States Securities and Exchange Commission and any stock exchange or similar authority, granting unto said attorney full power and authority to do and perform any and all acts for and on behalf of the undersigned which may be necessary or desirable to complete, as fully as the undersigned might or could do in person.

This Power of Attorney shall remain in full force and effect until revoked by the undersigned in a signed writing delivered to the foregoing attorneys-in-fact and agents.

IN WITNESS WHEREOF the undersigned has caused this Power of Attorney to be executed this 11^th day of March, 2014.

I, Timothy K. Weston, a Notary Public in and for the County of Milwaukee, State of Wisconsin, DO HEREBY CERTIFY that Gregory K. Ramirez, who is personally known to me to be the same person whose name is subscribed to the foregoing instrument, appeared before me this day in person and acknowledged that he signed and delivered the said instrument as his own free and voluntary act, for the uses and purposes therein set forth.

Given under my hand and notarial seal, this 11^th day of March, 2014.