SEC FORM 3

SEC Form 3

FORM 3

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

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

UBS Group AG

(Last)

(First)

(Middle)

BAHNHOFSTRASSE 45

PO BOX CH-8098

(Street)

ZURICH

(City)

(State)

(Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
11/28/2014

3. Issuer Name and Ticker or Trading Symbol
PIMCO CORPORATE & INCOME OPPORTUNITY FUND [ PTY ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

Director	X	10% Owner
Officer (give title below)		Other (specify below)

5. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Auction Preferred Stock⁽²⁾	3,242⁽³⁾	I	By subsidiary - see footnote⁽¹⁾

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)

Explanation of Responses:

1. This Statement is filed jointly by UBS Group AG for the benefit and on behalf of UBS Securities LLC and UBS Financial Services Inc., two-wholly owned subsidiaries of UBS AG to which UBS AG has delegated portions of its performance obligations with respect to the Auction Rate Securities Rights issued by UBS AG to certain clients and pursuant to which the securities reported herein have been purchased from such clients.

2. Cusip No 72201B200, 72201B309, 72201B408, 72201B507, 72201B606

3. Pursuant to the Global Relief Letter referred to below, this filing reports holdings of the Series of Auction Preferred Stock identified in Item 1 of this Table I on an aggregated basis.

Remarks:

The Shares reported herein represent UBS Group AG's combined holdings in multiple series of auction preferred securities of the issuer, which are treated herein as one class of securities in accordance with the Auction Rate Securities -- Global Exemptive Relief letter ("Global Relief Letter") issued by the staff of the Securities and Exchange Commission (SEC) on September 22, 2008. UBS Group AG undertakes to provide, upon request by the SEC staff, the issuer, or a security holder of the issuer, complete information regarding transaction(s) outlined above, as required by the Global Relief Letter. The event triggering notification is the acquisition of UBS AG by UBS Group AG through the completion of a share transfer offer on 28 November 2014 in which the shareholders of UBS AG became shareholders of UBS Group AG and their shares in UBS AG were transferred to UBS Group AG. As a result, UBS Group AG controls UBS AG.

	/s/ Anthony DeFilippis	12/02/2014
	/s/ William Chandler	12/02/2014
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
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