PENTAIR plc — Major Shareholding Notification 2008

Apr 28, 2008

SC 13G 1 b69937pisc13g.htm PENTAIR INC. sc13g PAGEBREAK

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SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934

Pentair Inc

(Name of Issuer)

COMMON STOCK

(Title of Class of Securities)

US7096311052

(CUSIP Number)

04/25/2008

(Date of Event Which Requires Filing of this Statement)

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

o Rule 13d-1(b)

þ Rule 13d-1(c)

o Rule 13d-1(d)

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CUSIP No. US7096311052 13G Page 1 of 1 Pages

1	NAMES OF REPORTING PERSONS/I.R.S. Identification Nos. of Above Persons (Entities Only) Pictet Asset Management SA(“PAM SA”) The reporting person disclaim beneficial ownership of the shares reported, which are owned of record and beneficially by three non-U.S. investment funds, both managed by PAM SA.
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
	(a) o
	(b) o
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION
	Pictet Asset Management SA - Switzerland
	5	SOLE VOTING POWER
NUMBER OF		Pictet Asset Management SA: 5,003,809
SHARES	6	SHARED VOTING POWER
BENEFICIALLY
OWNED BY		Pictet Asset Management SA: None
EACH	7	SOLE DISPOSITIVE POWER
REPORTING
PERSON		Pictet Asset Management SA: 5,003,809
WITH	8	SHARED DISPOSITIVE POWER
		Pictet Asset Management SA: None
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
	Pictet Asset Management SA: 5,003,809
10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
	o
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
	Pictet Asset Management SA: 5.04%
12	TYPE OF REPORTING PERSON:
	Pictet Asset Management SA: IA

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Item 2
Item 3. If this statement is filed pursuant to Rule 13d-1 (b), or 13d-2 (b) or (c), check whether the person is A
Item 4. Ownership
Item 5. Ownership of Five Percent or Less of a Class
Item 6. Ownership of More than Five Percent on Behalf of Another Person
Item 7. Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company
Item 8. Identification and Classification of Members of the Group
Item 9. Notice of Dissolution of the Group
Item 10. Certification
SIGNATURE

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link2 "Item 1"

Item 1.

(a)	Name of Issuer: Pentair Inc
(b)	Address of Issuer’s Principal Executive Offices:

5500 Wayzata Boulevard Suite 800 Golden Valley, MN 55416 United States

link2 "Item 2"

Item 2

(a)	Names of Person Filing:
	Pictet Asset Management SA(“PAM SA”)
(b)	Address of Principal Business Office or, if none, Residence:

Pictet Asset Management SA:

60 ROUTE DES ACACIAS GENEVA 73 SWITZERLAND CH-12 11

(c)	Citizenship:
	Pictet Asset Management SA: United Kingdom
(d)	Title of Class Securities: COMMON STOCK
(e)	CUSIP Number: US7096311052

link2 "Item 3. If this statement is filed pursuant to Rule 13d-1 (b), or 13d-2 (b) or (c), check whether the person is A"

Item 3. If this statement is filed pursuant to Rule 13d-1 (b), or 13d-2 (b) or (c), check whether the person is A

Not applicable.

link2 "Item 4. Ownership"

Item 4. Ownership

The reporting persons disclaim beneficial ownership of the shares reported, which are owned of record and beneficially by three non-U.S. investment funds, both are managed by PAM SA.

(a)	Amount Beneficially Owned:
	Pictet Asset Management SA: 5,003,809
(b)	Percent of Class:
	Pictet Asset Management SA: 5.04%
(c)	Number of shares as to which such person has:

Pictet Asset Management SA:

(i) sole power to vote or to direct the vote: 5,003,809

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(ii)	shared power to vote or to direct the vote: None
(iii)	sole power to dispose or to direct the disposition of:
5,003,809
(iv)	shared power to dispose or to direct the disposition of:
None

link2 "Item 5. Ownership of Five Percent or Less of a Class"

Item 5. Ownership of Five Percent or Less of a Class

Not applicable.

link2 "Item 6. Ownership of More than Five Percent on Behalf of Another Person"

Item 6. Ownership of More than Five Percent on Behalf of Another Person

Not applicable.

link2 "Item 7. Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company"

Item 7. Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company

See answer to Item 2 (a)

link2 "Item 8. Identification and Classification of Members of the Group"

Item 8. Identification and Classification of Members of the Group

Not applicable.

link2 "Item 9. Notice of Dissolution of the Group"

Item 9. Notice of Dissolution of the Group

Not applicable.

link2 "Item 10. Certification"

Item 10. Certification

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.

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link1 "SIGNATURE"

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.

Date : 28 th April 2008
/s/ David Cawthrow David Cawthrow
Chief Compliance Officer

AGREEMENT OF REPORTING PERSONS

The undersigned herby agree that the foregoing Schedule 13G is filed on behalf of the undersigned.

Pictet Asset Management SA
By:	/s/ David Cawthrow
	David Cawthrow, Chief Compliance Officer

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