sc13da506297178_05252015.htm

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

(Rule 13d-101)

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT

TO § 240.13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO

§ 240.13d-2(a)

(Amendment No. 5)1

Insperity, Inc.

(Name of Issuer)

Common Stock, $0.01 Par Value

(Title of Class of Securities)

45778Q107

(CUSIP Number)

JEFFREY C. SMITH

STARBOARD VALUE LP

777 Third Avenue, 18th Floor

New York, New York 10017

(212) 845-7977

STEVEN WOLOSKY, ESQ.

OLSHAN FROME WOLOSKY LLP

1325 Avenue of the Americas

New York, New York 10019

(212) 451-2300

(Name, Address and Telephone Number of Person

Authorized to Receive Notices and Communications)

May 23, 2016

(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 ¨.

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See § 240.13d-7 for other parties to whom copies are to be sent.

_______________

1 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 disclosures provided in a prior cover page.

The information required on 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. 45778Q107

1	NAME OF REPORTING PERSON STARBOARD VALUE LP
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 2,266,063
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 2,266,063
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,266,063
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 10.6%
14	TYPE OF REPORTING PERSON PN

CUSIP NO. 45778Q107

1	NAME OF REPORTING PERSON STARBOARD VALUE AND OPPORTUNITY MASTER FUND LTD
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS WC
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION CAYMAN ISLANDS
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 1,349,702
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 1,349,702
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,349,702
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 6.3%
14	TYPE OF REPORTING PERSON CO

CUSIP NO. 45778Q107

1	NAME OF REPORTING PERSON STARBOARD VALUE AND OPPORTUNITY S LLC
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS WC
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 302,157
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 302,157
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 302,157
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 1.4%
14	TYPE OF REPORTING PERSON OO

CUSIP NO. 45778Q107

1	NAME OF REPORTING PERSON STARBOARD VALUE AND OPPORTUNITY C LP
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS WC
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 163,927
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 163,927
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 163,927
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) Less than 1%
14	TYPE OF REPORTING PERSON PN

CUSIP NO. 45778Q107

1	NAME OF REPORTING PERSON STARBOARD VALUE R LP
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 163,927
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 163,927
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 163,927
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) Less than 1%
14	TYPE OF REPORTING PERSON PN

CUSIP NO. 45778Q107

1	NAME OF REPORTING PERSON STARBOARD VALUE R GP LLC
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 163,927
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 163,927
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 163,927
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) Less than 1%
14	TYPE OF REPORTING PERSON OO

CUSIP NO. 45778Q107

1	NAME OF REPORTING PERSON STARBOARD VALUE GP LLC
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 2,266,063
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 2,266,063
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,266,063
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 10.6%
14	TYPE OF REPORTING PERSON OO

CUSIP NO. 45778Q107

1	NAME OF REPORTING PERSON STARBOARD PRINCIPAL CO LP
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 2,266,063
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 2,266,063
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,266,063
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 10.6%
14	TYPE OF REPORTING PERSON PN

CUSIP NO. 45778Q107

1	NAME OF REPORTING PERSON STARBOARD PRINCIPAL CO GP LLC
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 2,266,063
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 2,266,063
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,266,063
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 10.6%
14	TYPE OF REPORTING PERSON OO

CUSIP NO. 45778Q107

1	NAME OF REPORTING PERSON JEFFREY C. SMITH
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION USA
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER - 0 -
	8	SHARED VOTING POWER 2,266,063
	9	SOLE DISPOSITIVE POWER - 0 -
	10	SHARED DISPOSITIVE POWER 2,266,063
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,266,063
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 10.6%
14	TYPE OF REPORTING PERSON IN

CUSIP NO. 45778Q107

1	NAME OF REPORTING PERSON MARK R. MITCHELL
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION USA
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER - 0 -
	8	SHARED VOTING POWER 2,266,063
	9	SOLE DISPOSITIVE POWER - 0 -
	10	SHARED DISPOSITIVE POWER 2,266,063
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,266,063
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 10.6%
14	TYPE OF REPORTING PERSON IN

CUSIP NO. 45778Q107

1	NAME OF REPORTING PERSON PETER A. FELD
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION USA
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 1,945
	8	SHARED VOTING POWER 2,266,063
	9	SOLE DISPOSITIVE POWER 1,945
	10	SHARED DISPOSITIVE POWER 2,266,063
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,268,008
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 10.6%
14	TYPE OF REPORTING PERSON IN

CUSIP NO. 45778Q107

The following constitutes Amendment No. 5 to the Schedule 13D filed by the undersigned (“Amendment No. 5”). This Amendment No. 5 amends the Schedule 13D as specifically set forth herein.

Item 3.

Source and Amount of Funds or Other Consideration.

Item 3 is hereby amended and restated to read as follows:

The Shares purchased by each of Starboard V&O Fund, Starboard S LLC and Starboard C LP and held in the Starboard Value LP Account were purchased with working capital (which may, at any given time, include margin loans made by brokerage firms in the ordinary course of business) in open market purchases. The aggregate purchase price of the 1,349,702 Shares beneficially owned by Starboard V&O Fund is approximately $44,643,955, excluding brokerage commissions. The aggregate purchase price of the 302,157 Shares beneficially owned by Starboard S LLC is approximately $10,538,198, excluding brokerage commissions. The aggregate purchase price of the 163,927 Shares beneficially owned by Starboard C LP is approximately $5,420,630, excluding brokerage commissions. The aggregate purchase price of the 450,277 Shares held in the Starboard Value LP Account is approximately $15,718,962, excluding brokerage commissions.

The 1,945 Shares beneficially owned by Mr. Feld, which include Shares of restricted stock that vest within 60 days hereof, were granted to Mr. Feld by the Issuer in his capacity as a director of the Issuer.

Item 4.

Purpose of Transaction.

Item 4 is hereby amended to add the following:

Starboard Value LP (together with its affiliates, “Starboard”) has undertaken the sales reported in this Amendment No. 5 to the Schedule 13D in large part to effectuate a rebalancing of Starboard’s portfolio in light of the significant appreciation in the Issuer’s stock price since Starboard filed its initial Schedule13D in the Issuer more than a year ago. The Shares sold by the Reporting Persons represent approximately 32% of the Reporting Persons’ total position in the Issuer. Starboard intends to remain a large shareholder of the Issuer, and Mr. Feld continues as an active member of the Issuer’s Board of Directors.

Item 5.

Interest in Securities of the Issuer.

Items 5(a)-(c) are hereby amended and restated to read as follows:

The aggregate percentage of Shares reported owned by each person named herein is based upon 21,386,048 Shares outstanding as of April 25, 2016, which is the total number of Shares outstanding as reported in the Issuer’s Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on May 2, 2016.

A.	Starboard V&O Fund

(a)

As of the date hereof, Starboard V&O Fund beneficially owned 1,349,702 Shares.

Percentage: Approximately 6.3%

CUSIP NO. 45778Q107

(b)

1. Sole power to vote or direct vote: 1,349,702

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 1,349,702

4. Shared power to dispose or direct the disposition: 0

(c)

The transactions in the Shares by Starboard V&O Fund since the filing of Amendment No. 4 to the Schedule 13D are set forth in Schedule A and are incorporated herein by reference

B.	Starboard S LLC

(a)

As of the date hereof, Starboard S LLC beneficially owned 302,157 Shares.

Percentage: Approximately 1.4%

(b)

1. Sole power to vote or direct vote: 302,157

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 302,157

4. Shared power to dispose or direct the disposition: 0

(c)

The transactions in the Shares by Starboard S LLC since the filing of Amendment No. 4 to the Schedule 13D are set forth in Schedule A and are incorporated herein by reference.

C.	Starboard C LP

(a)

As of the date hereof, Starboard C LP beneficially owned 163,927 Shares.

Percentage: Less than 1%

(b)

1. Sole power to vote or direct vote: 163,927

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 163,927

4. Shared power to dispose or direct the disposition: 0

(c)

The transactions in the Shares by Starboard C LP since the filing of Amendment No. 4 to the Schedule 13D are set forth in Schedule A and are incorporated herein by reference.

D.	Starboard R LP

(a)

Starboard R LP, as the general partner of Starboard C LP, may be deemed the beneficial owner of the 163,927 shares owned by Starboard C LP.

Percentage: Less than 1%

(b)

1. Sole power to vote or direct vote: 163,927

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 163,927

4. Shared power to dispose or direct the disposition: 0

(c)

Starboard R LP has not entered into any transactions in the Shares since the filing of Amendment No. 4 to the Schedule 13D. The transactions in the Shares on behalf of Starboard C LP since the filing of Amendment No. 4 to the Schedule 13D are set forth in Schedule A and are incorporated herein by reference.

CUSIP NO. 45778Q107

E.	Starboard R GP

(a)

Starboard R GP, as the general partner of Starboard R LP, may be deemed the beneficial owner of the 163,927 shares owned by Starboard C LP.

Percentage: Less than 1%

(b)

1. Sole power to vote or direct vote: 163,927

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 163,927

4. Shared power to dispose or direct the disposition: 0

(c)

Starboard R GP has not entered into any transactions in the Shares since the filing of Amendment No. 4 to the Schedule 13D. The transactions in the Shares on behalf of Starboard C LP since the filing of Amendment No. 4 to the Schedule 13D are set forth in Schedule A and are incorporated herein by reference.

F.	Starboard Value LP

(a)

As of the date hereof, 450,277 Shares were held in the Starboard Value LP Account. Starboard Value LP, as the investment manager of Starboard V&O Fund, Starboard C LP and the Starboard Value LP Account and the manager of Starboard S LLC, may be deemed the beneficial owner of the (i) 1,349,702 Shares owned by Starboard V&O Fund, (ii) 302,157 Shares owned by Starboard S LLC, (iii) 163,927 Shares owned by Starboard C LP and (iv) 450,277 Shares held in the Starboard Value LP Account.

Percentage: Approximately 10.6%

(b)

1. Sole power to vote or direct vote: 2,266,063

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 2,266,063

4. Shared power to dispose or direct the disposition: 0

(c)

The transactions in the Shares by Starboard Value LP through the Starboard Value LP Account and on behalf of each of Starboard V&O Fund, Starboard S LLC and Starboard C LP since the filing of Amendment No. 4 to the Schedule 13D are set forth in Schedule A and are incorporated herein by reference.

G.	Starboard Value GP

(a)

Starboard Value GP, as the general partner of Starboard Value LP, may be deemed the beneficial owner of the (i) 1,349,702 Shares owned by Starboard V&O Fund, (ii) 302,157 Shares owned by Starboard S LLC, (iii) 163,927 Shares owned by Starboard C LP and (iv) 450,277 Shares held in the Starboard Value LP Account.

Percentage: Approximately 10.6%

(b)

1. Sole power to vote or direct vote: 2,266,063

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 2,266,063

4. Shared power to dispose or direct the disposition: 0

(c)

Starboard Value GP has not entered into any transactions in the Shares since the filing of Amendment No. 4 to the Schedule 13D. The transactions in the Shares on behalf of each of Starboard V&O Fund, Starboard S LLC, Starboard C LP and through the Starboard Value LP Account since the filing of Amendment No. 4 to the Schedule 13D are set forth in Schedule A and are incorporated herein by reference.

CUSIP NO. 45778Q107

H.	Principal Co

(a)

Principal Co, as a member of Starboard Value GP, may be deemed the beneficial owner of the (i) 1,349,702 Shares owned by Starboard V&O Fund, (ii) 302,157 Shares owned by Starboard S LLC, (iii) 163,927 Shares owned by Starboard C LP and (iv) 450,277 Shares held in the Starboard Value LP Account.

Percentage: Approximately 10.6%

(b)

1. Sole power to vote or direct vote: 2,266,063

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 2,266,063

4. Shared power to dispose or direct the disposition: 0

(c)

Principal Co has not entered into any transactions in the Shares since the filing of Amendment No. 4 to the Schedule 13D. The transactions in the Shares on behalf of each of Starboard V&O Fund, Starboard S LLC, Starboard C LP and through the Starboard Value LP Account since the filing of Amendment No. 4 to the Schedule 13D are set forth in Schedule A and are incorporated herein by reference.

I.	Principal GP

(a)

Principal GP, as the general partner of Principal Co, may be deemed the beneficial owner of the (i) 1,349,702 Shares owned by Starboard V&O Fund, (ii) 302,157 Shares owned by Starboard S LLC, (iii) 163,927 Shares owned by Starboard C LP and (iv) 450,277 Shares held in the Starboard Value LP Account.

Percentage: Approximately 10.6%

(b)

1. Sole power to vote or direct vote: 2,266,063

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 2,266,063

4. Shared power to dispose or direct the disposition: 0

(c)

Principal GP has not entered into any transactions in the Shares since the filing of Amendment No. 4 to the Schedule 13D. The transactions in the Shares on behalf of each of Starboard V&O Fund, Starboard S LLC, Starboard C LP and through the Starboard Value LP Account since the filing of Amendment No. 4 to the Schedule 13D are set forth in Schedule A and are incorporated herein by reference.

Mr. Feld

(a)

As of the date hereof, Mr. Feld beneficially owned 1,945 Shares, which include Shares of restricted stock that vest within 60 days hereof. Mr. Feld, as a member of Principal GP and as a member of each of the Management Committee of Starboard Value GP and the Management Committee of Principal GP, may be deemed the beneficial owner of the (i) 1,349,702 Shares owned by Starboard V&O Fund, (ii) 302,157 Shares owned by Starboard S LLC, (iii) 163,927 Shares owned by Starboard C LP and (iv) 450,277 Shares held in the Starboard Value LP Account.

Percentage: Approximately 10.6%

(b)

1. Sole power to vote or direct vote: 1,945

2. Shared power to vote or direct vote: 2,266,063

3. Sole power to dispose or direct the disposition: 1,945

4. Shared power to dispose or direct the disposition: 2,266,063

(c)

Mr. Feld has not entered into any transactions in the Shares since the filing of Amendment No. 4 to the Schedule 13D. The transactions in the Shares on behalf of each of Starboard V&O Fund, Starboard S LLC, Starboard C LP and through the Starboard Value LP Account since the filing of Amendment No. 4 to the Schedule 13D are set forth in Schedule A and are incorporated herein by reference.

CUSIP NO. 45778Q107

K.	Messrs. Smith and Mitchell

(a)

Each of Messrs. Smith and Mitchell, as a member of Principal GP and as a member of each of the Management Committee of Starboard Value GP and the Management Committee of Principal GP, may be deemed the beneficial owner of the (i) 1,349,702 Shares owned by Starboard V&O Fund, (ii) 302,157 Shares owned by Starboard S LLC, (iii) 163,927 Shares owned by Starboard C LP and (iv) 450,277 Shares held in the Starboard Value LP Account.

Percentage: Approximately 10.6%

(b)

1. Sole power to vote or direct vote: 0

2. Shared power to vote or direct vote: 2,266,063

3. Sole power to dispose or direct the disposition: 0

4. Shared power to dispose or direct the disposition: 2,266,063

(c)

None of Messrs. Smith or Mitchell has entered into any transactions in the Shares since the filing of Amendment No. 4 to the Schedule 13D. The transactions in the Shares on behalf of each of Starboard V&O Fund, Starboard S LLC, Starboard C LP and through the Starboard Value LP Account since the filing of Amendment No. 4 to the Schedule 13D are set forth in Schedule A and are incorporated herein by reference.

Each Reporting Person, as a member of a “group” with the other Reporting Persons for the purposes of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended, may be deemed the beneficial owner of the Shares directly owned by the other Reporting Persons. Each Reporting Person disclaims beneficial ownership of such Shares except to the extent of his or its pecuniary interest therein.

CUSIP NO. 45778Q107

SIGNATURES

After reasonable inquiry and to the best of his knowledge and belief, each of the undersigned certifies that the information set forth in this statement is true, complete and correct.

Dated: May 25, 2016

STARBOARD VALUE AND OPPORTUNITY MASTER FUND LTD

By: Starboard Value LP,

its investment manager

STARBOARD VALUE AND OPPORTUNITY S LLC

By: Starboard Value LP,

its manager

STARBOARD VALUE AND OPPORTUNITY C LP

By: Starboard Value R LP,

its general partner

STARBOARD VALUE R LP

By: Starboard Value R GP LLC,

its general partner

STARBOARD VALUE LP

By: Starboard Value GP LLC,

its general partner

STARBOARD VALUE GP LLC

By: Starboard Principal Co LP,

its member

STARBOARD PRINCIPAL CO LP

By: Starboard Principal Co GP LLC,

its general partner

STARBOARD PRINCIPAL CO GP LLC

STARBOARD VALUE R GP LLC



By:	/s/ Jeffrey C. Smith
	Name:	Jeffrey C. Smith
	Title:	Authorized Signatory

/s/ Jeffrey C. Smith

JEFFREY C. SMITH

Individually and as attorney-in-fact for Mark R. Mitchell and Peter A. Feld

CUSIP NO. 45778Q107

SCHEDULE A

Transactions in the Shares Since the Filing of Amendment No. 4 to the Schedule 13D

Shares of Common Stock

Purchased/(Sold)

Price Per

Share($)

Date of

Purchase / Sale

STARBOARD VALUE AND OPPORTUNITY MASTER FUND LTD

(42,938)	70.6838	05/23/2016
(10,290)	70.3501	05/23/2016
(4,527)	70.7592	05/23/2016
(74,886)	70.1144	05/23/2016
(143,893)	70.1763	05/24/2016
(82,141)	70.3657	05/24/2016

(206,609)	69.4111	05/25/2016
(71,972)	69.5571	05/25/2016

STARBOARD VALUE AND OPPORTUNITY S LLC

(9,613)	70.6838	05/23/2016
(2,303)	70.3501	05/23/2016
(1,013)	70.7592	05/23/2016
(16,765)	70.1144	05/23/2016
(32,213)	70.1763	05/24/2016
(18,389)	70.3657	05/24/2016

(46,254)	69.4111	05/25/2016
(16,113)	69.5571	05/25/2016

STARBOARD VALUE AND OPPORTUNITY C LP

(5,215)	70.6838	05/23/2016
(1,250)	70.3501	05/23/2016
(550)	70.7592	05/23/2016
(9,095)	70.1144	05/23/2016
(17,476)	70.1763	05/24/2016
(9,977)	70.3657	05/24/2016

(25,093)	69.4111	05/25/2016
(8,741)	69.5571	05/25/2016

STARBOARD VALUE LP

(Through the Starboard Value LP Account)

(14,325)	70.6838	05/23/2016
(3,433)	70.3501	05/23/2016
(1,510)	70.7592	05/23/2016
(24,983)	70.1144	05/23/2016
(48,005)	70.1763	05/24/2016
(27,403)	70.3657	05/24/2016

(68,927)	69.4111	05/25/2016
(24,011)	69.5571	05/25/2016