	UNITED STATES
	SECURITIES AND EXCHANGE COMMISSION
	Washington, D.C. 20549

SCHEDULE 13G/A

(Rule 13d-102)

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO § 240.13d-1(b), (c) AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO § 240.13D-2

Under the Securities Exchange Act of 1934
(Amendment No: 1)*

Artio Global Investors Inc.

(Name of Issuer)

Class A Common Stock

(Title of Class of Securities)

04315B107

(CUSIP Number)

May 21, 2013

(Date of Event Which Requires Filing of this Statement)

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

o	Rule 13d-1(b)
o	Rule 13d-1(c)
x	Rule 13d-1(d)

*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).

CUSIP No. 04315B107

	1.	Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only). GAM Holding AG

	2.	Check the Appropriate Box if a Member of a Group (See Instructions)
		(a)		o
		(b)		o

	3.	SEC Use Only

	4.	Citizenship or Place of Organization Switzerland

Number of Shares Beneficially Owned by Each Reporting Person With*			5.		Sole Voting Power 0

			6.		Shared Voting Power 0

			7.		Sole Dispositive Power 0

			8.		Shared Dispositive Power 0

	9.	Aggregate Amount Beneficially Owned by Each Reporting Person 0

	10.	Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) o

	11.	Percent of Class Represented by Amount in Row (9) 0

	12.	Type of Reporting Person (See Instructions) HC

This Amendment No.1 to Schedule 13G (this “Amendment”) is an amendment to the initial statement on Schedule 13G relating to shares of Class A Common Stock (the “Common Stock”), of Artio Global Investors Inc., a Delaware corporation (the “Issuer”), filed with the Securities and Exchange Commission on February 14, 2013(the “Schedule 13G”).

This Amendment is being filed on behalf of GAM Holding AG (the “Reporting Person”).

This Amendment amends and restates the Schedule 13G as follows.

Item 1.
	(a)	Name of Issuer Artio Global Investors Inc.
	(b)	Address of Issuer’s Principal Executive Offices 330 Madison Avenue New York, NY 10017

Item 2.
	(a)	Name of Person Filing GAM Holding AG
	(b)	Address of Principal Business Office or, if none, Residence Klaustrasse 10, 8034 Zurich, Switzerland
	(c)	Citizenship Switzerland
	(d)	Title of Class of Securities Class A Common Stock
	(e)	CUSIP Number 04315B107

Item 3.	If this statement is filed pursuant to §§240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
	(a)	o	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o).
	(b)	o	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).
	(c)	o	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c).
	(d)	o	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C 80a-8).
	(e)	o	An investment adviser in accordance with §240.13d-1(b)(1)(ii)(E);
	(f)	o	An employee benefit plan or endowment fund in accordance with §240.13d-1(b)(1)(ii)(F);
	(g)	o	A parent holding company or control person in accordance with §240.13d-1(b)(1)(ii)(G);
	(h)	o	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
	(i)	o	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
	(j)	o	Group, in accordance with § 240.13d–1(b)(1)(ii)(J).

Item 4.	Ownership.
Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1.
	(a)	Amount beneficially owned: 0
	(b)	Percent of class: 0%
	(c)	Number of shares as to which the person has:
		(i)	Sole power to vote or to direct the vote 0
		(ii)	Shared power to vote or to direct the vote 0
		(iii)	Sole power to dispose or to direct the disposition of 0
		(iv)	Shared power to dispose or to direct the disposition of 0

Item 5.	Ownership of Five Percent or Less of a Class
If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following x.

Item 6.	Ownership of More than Five Percent on Behalf of Another Person.
Not applicable

Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company or Control Person.
Not applicable

Item 8.	Identification and Classification of Members of the Group
Not applicable

Item 9.	Notice of Dissolution of Group
Not applicable

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.

	June 24, 2013
	Date

	GAM HOLDING AG

	/s/ Scott Sullivan
	Signature

	Scott Sullivan, Group General Counsel
	Name/Title

Artio Global Investors Inc. SC 13G/A