SC 13D/A

UNITED STATES

SECURITIES AND EXCHANGE
COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934
(Amendment No. 3)*

SPX Corporation

(Name of Issuer)

Common Stock, $10.00 par value

(Title of Class of Securities)

784635104

(CUSIP Number)

Ralph V. Whitworth
Relational Investors, LLC
12400 High Bluff Drive, Suite 600
San Diego, CA 92130
(858) 704-3333

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

August 28, 2013

(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. o

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.

* 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).

	1.	Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only) Relational Investors, LLC
	2.	Check the Appropriate Box if a Member of a Group (See Instructions)
		(a)			x
		(b)			o
	3.	SEC Use Only
	4.	Source of Funds (See Instructions) OO
	5.	Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e)     o
	6.	Citizenship or Place of Organization Delaware
Number of Shares Beneficially Owned by Each Reporting Person With			7.	Sole Voting Power 6,898,535
			8.	Shared Voting Power -0-
			9.	Sole Dispositive Power 6,898,535
			10.	Shared Dispositive Power -0-
	11.	Aggregate Amount Beneficially Owned by Each Reporting Person 6,898,535
	12.	Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)   o
	13.	Percent of Class Represented by Amount in Row (11) 15.22%
	14.	Type of Reporting Person (See Instructions) IA/HC/OO

2

	1.	Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only) Relational Investors Mid-Cap Fund I, L.P.
	2.	Check the Appropriate Box if a Member of a Group (See Instructions)
		(a)			x
		(b)			o
	3.	SEC Use Only
	4.	Source of Funds (See Instructions) WC
	5.	Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e)     o
	6.	Citizenship or Place of Organization Delaware
Number of Shares Beneficially Owned by Each Reporting Person With			7.	Sole Voting Power 1,680,810
			8.	Shared Voting Power -0-
			9.	Sole Dispositive Power 1,680,810
			10.	Shared Dispositive Power -0-
	11.	Aggregate Amount Beneficially Owned by Each Reporting Person 1,680,810
	12.	Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)   o
	13.	Percent of Class Represented by Amount in Row (11) 3.71%
	14.	Type of Reporting Person (See Instructions) PN

3

	1.	Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only) Relational Investors Mid-Cap Fund II, L.P.
	2.	Check the Appropriate Box if a Member of a Group (See Instructions)
		(a)			x
		(b)			o
	3.	SEC Use Only
	4.	Source of Funds (See Instructions) WC
	5.	Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e)     o
	6.	Citizenship or Place of Organization Delaware
Number of Shares Beneficially Owned by Each Reporting Person With			7.	Sole Voting Power 1,281,263
			8.	Shared Voting Power -0-
			9.	Sole Dispositive Power 1,281,263
			10.	Shared Dispositive Power -0-
	11.	Aggregate Amount Beneficially Owned by Each Reporting Person 1,281,263
	12.	Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)   o
	13.	Percent of Class Represented by Amount in Row (11) 2.83%
	14.	Type of Reporting Person (See Instructions) PN

4

	1.	Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only) Relational Fund Partners, L.P.
	2.	Check the Appropriate Box if a Member of a Group (See Instructions)
		(a)			x
		(b)			o
	3.	SEC Use Only
	4.	Source of Funds (See Instructions) WC/OO
	5.	Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e)     o
	6.	Citizenship or Place of Organization Delaware
Number of Shares Beneficially Owned by Each Reporting Person With			7.	Sole Voting Power 19,631
			8.	Shared Voting Power -0-
			9.	Sole Dispositive Power 19,631
			10.	Shared Dispositive Power -0-
	11.	Aggregate Amount Beneficially Owned by Each Reporting Person 19,631
	12.	Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)   o
	13.	Percent of Class Represented by Amount in Row (11) 0.04%
	14.	Type of Reporting Person (See Instructions) PN

5

	1.	Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only) Relational Coast Partners, L.P.
	2.	Check the Appropriate Box if a Member of a Group (See Instructions)
		(a)			x
		(b)			o
	3.	SEC Use Only
	4.	Source of Funds (See Instructions) WC/OO
	5.	Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e)     o
	6.	Citizenship or Place of Organization Delaware
Number of Shares Beneficially Owned by Each Reporting Person With			7.	Sole Voting Power 311,570
			8.	Shared Voting Power -0-
			9.	Sole Dispositive Power 311,570
			10.	Shared Dispositive Power -0-
	11.	Aggregate Amount Beneficially Owned by Each Reporting Person 311,570
	12.	Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)   o
	13.	Percent of Class Represented by Amount in Row (11) 0.69%
	14.	Type of Reporting Person (See Instructions) PN

6

	1.	Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only) Relational Investors IX, L.P.
	2.	Check the Appropriate Box if a Member of a Group (See Instructions)
		(a)			x
		(b)			o
	3.	SEC Use Only
	4.	Source of Funds (See Instructions) WC
	5.	Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e)     o
	6.	Citizenship or Place of Organization Delaware
Number of Shares Beneficially Owned by Each Reporting Person With			7.	Sole Voting Power 359,147
			8.	Shared Voting Power -0-
			9.	Sole Dispositive Power 359,147
			10.	Shared Dispositive Power -0-
	11.	Aggregate Amount Beneficially Owned by Each Reporting Person 359,147
	12.	Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)   o
	13.	Percent of Class Represented by Amount in Row (11) 0.79%
	14.	Type of Reporting Person (See Instructions) PN

7

	1.	Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only) Relational Investors XV, L.P.
	2.	Check the Appropriate Box if a Member of a Group (See Instructions)
		(a)			x
		(b)			o
	3.	SEC Use Only
	4.	Source of Funds (See Instructions) WC
	5.	Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e)     o
	6.	Citizenship or Place of Organization Delaware
Number of Shares Beneficially Owned by Each Reporting Person With			7.	Sole Voting Power 207,296
			8.	Shared Voting Power -0-
			9.	Sole Dispositive Power 207,296
			10.	Shared Dispositive Power -0-
	11.	Aggregate Amount Beneficially Owned by Each Reporting Person 207,296
	12.	Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)   o
	13.	Percent of Class Represented by Amount in Row (11) 0.46%
	14.	Type of Reporting Person (See Instructions) PN

8

	1.	Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only) Relational Investors XVI, L.P.
	2.	Check the Appropriate Box if a Member of a Group (See Instructions)
		(a)			x
		(b)			o
	3.	SEC Use Only
	4.	Source of Funds (See Instructions) WC
	5.	Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e)     o
	6.	Citizenship or Place of Organization Delaware
Number of Shares Beneficially Owned by Each Reporting Person With			7.	Sole Voting Power 102,636
			8.	Shared Voting Power -0-
			9.	Sole Dispositive Power 102,636
			10.	Shared Dispositive Power -0-
	11.	Aggregate Amount Beneficially Owned by Each Reporting Person 102,636
	12.	Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)   o
	13.	Percent of Class Represented by Amount in Row (11) 0.23%
	14.	Type of Reporting Person (See Instructions) PN

9

	1.	Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only) Relational Investors XX, L.P.
	2.	Check the Appropriate Box if a Member of a Group (See Instructions)
		(a)			x
		(b)			o
	3.	SEC Use Only
	4.	Source of Funds (See Instructions) WC/OO
	5.	Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e)     o
	6.	Citizenship or Place of Organization Delaware
Number of Shares Beneficially Owned by Each Reporting Person With			7.	Sole Voting Power 187,112
			8.	Shared Voting Power -0-
			9.	Sole Dispositive Power 187,112
			10.	Shared Dispositive Power -0-
	11.	Aggregate Amount Beneficially Owned by Each Reporting Person 187,112
	12.	Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)   o
	13.	Percent of Class Represented by Amount in Row (11) 0.41%
	14.	Type of Reporting Person (See Instructions) PN

10

	1.	Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only) Relational Investors XXIII, L.P.
	2.	Check the Appropriate Box if a Member of a Group (See Instructions)
		(a)			x
		(b)			o
	3.	SEC Use Only
	4.	Source of Funds (See Instructions) WC/OO
	5.	Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e)     o
	6.	Citizenship or Place of Organization Delaware
Number of Shares Beneficially Owned by Each Reporting Person With			7.	Sole Voting Power 265,639
			8.	Shared Voting Power -0-
			9.	Sole Dispositive Power 265,639
			10.	Shared Dispositive Power -0-
	11.	Aggregate Amount Beneficially Owned by Each Reporting Person 265,639
	12.	Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)   o
	13.	Percent of Class Represented by Amount in Row (11) 0.59%
	14.	Type of Reporting Person (See Instructions) PN

11

	1.	Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only) Relational Investors XXIV, L.P.
	2.	Check the Appropriate Box if a Member of a Group (See Instructions)
		(a)			x
		(b)			o
	3.	SEC Use Only
	4.	Source of Funds (See Instructions) WC
	5.	Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e)     o
	6.	Citizenship or Place of Organization Delaware
Number of Shares Beneficially Owned by Each Reporting Person With			7.	Sole Voting Power 3,537
			8.	Shared Voting Power -0-
			9.	Sole Dispositive Power 3,537
			10.	Shared Dispositive Power -0-
	11.	Aggregate Amount Beneficially Owned by Each Reporting Person 3,537
	12.	Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)   o
	13.	Percent of Class Represented by Amount in Row (11) 0.01%
	14.	Type of Reporting Person (See Instructions) PN

12

	1.	Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only) RH Fund 1, L.P.
	2.	Check the Appropriate Box if a Member of a Group (See Instructions)
		(a)			x
		(b)			o
	3.	SEC Use Only
	4.	Source of Funds (See Instructions) WC/OO
	5.	Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e)     o
	6.	Citizenship or Place of Organization Delaware
Number of Shares Beneficially Owned by Each Reporting Person With			7.	Sole Voting Power 138,854
			8.	Shared Voting Power -0-
			9.	Sole Dispositive Power 138,854
			10.	Shared Dispositive Power -0-
	11.	Aggregate Amount Beneficially Owned by Each Reporting Person 138,854
	12.	Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)   o
	13.	Percent of Class Represented by Amount in Row (11) 0.31%
	14.	Type of Reporting Person (See Instructions) PN

13

	1.	Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only) Ralph V. Whitworth
	2.	Check the Appropriate Box if a Member of a Group (See Instructions)
		(a)			x
		(b)			o
	3.	SEC Use Only
	4.	Source of Funds (See Instructions) NA
	5.	Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e)     o
	6.	Citizenship or Place of Organization United States
Number of Shares Beneficially Owned by Each Reporting Person With			7.	Sole Voting Power -0-
			8.	Shared Voting Power 6,898,535
			9.	Sole Dispositive Power -0-
			10.	Shared Dispositive Power 6,898,535
	11.	Aggregate Amount Beneficially Owned by Each Reporting Person 6,898,535
	12.	Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)   o
	13.	Percent of Class Represented by Amount in Row (11) 15.22%
	14.	Type of Reporting Person (See Instructions) IN

14

	1.	Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only) David H. Batchelder
	2.	Check the Appropriate Box if a Member of a Group (See Instructions)
		(a)			x
		(b)			o
	3.	SEC Use Only
	4.	Source of Funds (See Instructions) NA
	5.	Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e)     o
	6.	Citizenship or Place of Organization United States
Number of Shares Beneficially Owned by Each Reporting Person With			7.	Sole Voting Power -0-
			8.	Shared Voting Power 6,898,535
			9.	Sole Dispositive Power -0-
			10.	Shared Dispositive Power 6,898,535
	11.	Aggregate Amount Beneficially Owned by Each Reporting Person 6,898,535
	12.	Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)   o
	13.	Percent of Class Represented by Amount in Row (11) 15.22%
	14.	Type of Reporting Person (See Instructions) IN

15

Item 1.   Security and Issuer

This Schedule 13D/A constitutes the third amendment to the Schedule 13D originally filed by the Reporting Persons with the Securities and Exchange Commission (the “SEC”) on February 25, 2013 and amended by Amendment No. 1 and No. 2 filed by the Reporting Persons with the SEC on March 25, 2013 and May 6, 2013 (the “Statement”) with respect to the common stock, $10.00 par value (the “Shares”), of SPX Corporation (the “Issuer” or the “Company”). Except as specifically amended by this Schedule 13D/A, the Statement remains in full force and effect.

Item 2.   Identity and Background

This Statement is being filed by and on behalf of Relational Investors Mid-Cap Fund I, L.P. (“MC I”), Relational Investors Mid-Cap Fund II, L.P. (“MC II”), Relational Fund Partners, L.P. (“RFP”), Relational Coast Partners, L.P. (“RCP”), Relational Investors IX, L.P. (“RI IX”), Relational Investors XV, L.P. (“RI XV”), Relational Investors XVI, L.P. (“RI XVI”), Relational Investors XX, L.P. (“RI XX”), Relational Investors XXIII, L.P. (“RI XXIII”), Relational Investors XXIV, L.P. (“RI XXIV”) and RH Fund 1, L.P. (“RHF 1”), collectively, the “Relational LPs.”  Each of the Relational LPs is a Delaware limited partnership.  The principal business of each, is investing in securities.

This Statement is also being filed by Relational Investors, LLC (“RILLC”), a Delaware limited liability company.  The principal business of RILLC is being the sole general partner or sole managing member of the general partner of certain investment partnerships, including the Relational LPs and the investment adviser of certain client managed accounts, the “Managed Accounts”.  The Relational LPs and the Managed Accounts are the beneficial owners of the securities covered by this Statement.  Pursuant to the Limited Partnership Agreement of each of the Relational LPs, and the investment management agreement of the Managed Accounts, RILLC has sole investment discretion and voting authority with respect to the securities covered by this Statement.

This Statement is also being filed by Ralph V. Whitworth and David H. Batchelder.  Messrs. Whitworth and Batchelder are the Principals of RILLC, in which capacity they share voting control and dispositive power over certain securities covered by this Statement.  As such, Messrs. Whitworth and Batchelder may be deemed to have indirect beneficial ownership of such securities, but, each of Mr. Whitworth and Mr. Batchelder disclaim beneficial ownership of the Shares except to the extent of his pecuniary interest therein.  The present principal occupation of each of Messrs. Whitworth and Batchelder is serving as Principals of RILLC (Messrs. Whitworth and Batchelder, together with Relational LPs and RILLC, hereinafter, the “Reporting Persons”).

During the last five years, none of the Reporting Persons has been (i) convicted in a criminal proceeding (excluding traffic violations and similar misdemeanors) or (ii) a party to a civil proceeding of a judicial or administrative body of competent jurisdiction, and as a result of such proceeding, was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

The business address of each of the Reporting Persons is 12400 High Bluff Drive, Suite 600, San Diego, CA 92130.

Messrs. Whitworth and Batchelder are each citizens of the United States.

Item 3.   Source and Amount of Funds or Other Consideration

RILLC and the Managed Accounts purchased an aggregate of 2,341,040 Shares for a total consideration (including brokerage commissions) of $176.7 million derived from capital of RILLC and the Managed Accounts.

The Relational LPs purchased an aggregate of 4,557,495 Shares for total consideration (including brokerage commissions) of $335.8 million derived from the capital of the Relational LPs and margin borrowings from Credit Suisse Securities (USA) LLC (“CSSU”) for RFP, RCP, RI XX, RI XXIII and RHF 1.

Interest on the margin debt balance of the margin accounts described above is charged at the then Federal Funds Rate plus 50 basis points.  CSSU has a lien on the Shares held by RFP, RCP, RI XX, RI XXIII and RHF 1 to secure repayment of the margin borrowings described above.

16

Item 5.   Interest in Securities of the Issuer

(a)           As of the date of this Statement, the Reporting Persons beneficially owned in the aggregate 6,898,535 Shares, constituting 15.22% of the outstanding Shares.  The percentage of Shares owned is based upon 45,329,902 Shares outstanding on July 26, 2013, as set forth in the Issuer’s Form 10-Q for the quarter ended June 29, 2013.  The Reporting Persons may be deemed to have direct beneficial ownership of the Shares as follows:

NAME	NUMBER OF SHARES	% OF OUTSTANDING SHARES		VOTING AND DISPOSITIVE POWER
RILLC	2,341,040	5.16	%	Sole
MC I	1,680,810	3.71	%	Sole
MC II	1,281,263	2.83	%	Sole
RFP	19,631	0.04	%	Sole
RCP	311,570	0.69	%	Sole
RI IX	359,147	0.79	%	Sole
RI XV	207,296	0.46	%	Sole
RI XVI	102,636	0.23	%	Sole
RI XX	187,112	0.41	%	Sole
RI XXIII	265,639	0.59	%	Sole
RI XXIV	3,537	0.01	%	Sole
RHF 1	138,854	0.31	%	Sole

17

RILLC, individually and in its capacity as an investment adviser, may be deemed to possess direct beneficial ownership of the 2,341,040 Shares that are owned by it and the Managed Accounts.  Additionally, RILLC, as the sole general partner, or sole managing member of the general partner, of each of the Relational LPs may be deemed to beneficially own (as that term is defined in Rule 13d-3 under the Securities Exchange Act of 1934, as amended) the 4,557,495 Shares beneficially owned by the Relational LPs because the limited partnership agreements of the Relational LPs specify that RILLC has sole investment discretion and voting authority with respect to those Shares.

Each of Messrs. Whitworth and Batchelder, as Principals of RILLC, may be deemed to share indirect beneficial ownership of the Shares which RILLC may beneficially own.  Each of Messrs. Whitworth and Batchelder disclaims beneficial ownership of such Shares for all other purposes.

To the best of the knowledge of each of the Reporting Persons, other than as set forth above, none of the persons named in Item 2 is the beneficial owner of any Shares.

(b)           See item (a) above.

(c)           Except as set forth in Exhibit A to this Statement, none of the Reporting Persons has effected any transactions in the Shares during the past sixty days not previously reported.

(d)           No other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the Shares covered by this Statement, except that dividends from, and proceeds from the sale of, the Shares held by accounts managed by RILLC may be delivered to such accounts.

(e)           Not applicable.

Item 6.  Contracts, Arrangements, Understandings or Relationships with Respect to Securities of the Issuer

Except for the joint filing agreement between and among the Reporting Persons attached hereto as Exhibit B, and except for the investment discretion and voting authority described in Item 2 of this Statement and in the respective partnership agreements and investment management agreements of the Relational LPs and Managed Accounts which each contain provisions whereby RILLC may, after certain adjustments, receive a percentage of realized or unrealized profits, if any, derived from that partnership’s or managed account’s investments, to the best of the knowledge of the Reporting Persons, there are no contracts, arrangements, understandings or relationships (legal or otherwise) among the Reporting Persons or between the Reporting Persons and any other person with respect to any securities of the Issuer, including but not limited to transfer or voting of any of the securities, finder’s fees, joint ventures, loan or option arrangements, puts or calls, guarantees of profits, division of profits or loss, or the giving or withholding of proxies.

Item 7.  Material to Be Filed as Exhibits

The following Exhibits are filed herewith:

Exhibit A – Information concerning transactions in the Shares effected by the Reporting Persons in the last 60 days not previously reported.

Exhibit B – Joint Filing Agreement.

18

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.

Dated:  August 30, 2013

RELATIONAL INVESTORS MID-CAP FUND I, L.P.
RELATIONAL INVESTORS MID-CAP FUND II, L.P.
RELATIONAL FUND PARTNERS, L.P.
RELATIONAL COAST PARTNERS, L.P.
RELATIONAL INVESTORS IX, L.P.
RELATIONAL INVESTORS XV, L.P.
RELATIONAL INVESTORS XVI, L.P.
RELATIONAL INVESTORS XX, L.P.
RELATIONAL INVESTORS XXIII, L.P.
RELATIONAL INVESTORS XXIV, L.P.
RH FUND 1, L.P.

By:	RELATIONAL INVESTORS, LLC
	as general partner to each,
		By:	/s/ Ralph V. Whitworth
			Ralph V. Whitworth, Principal
RELATIONAL INVESTORS, LLC
		By:	/s/ Ralph V. Whitworth
			Ralph V. Whitworth, Principal
/s/ Ralph V. Whitworth
Ralph V. Whitworth
/s/ David H. Batchelder
David H. Batchelder

19

EX-99.A

Exhibit A

Transactions by Reporting Persons in the last 60 days not previously reported

Beneficial Ownership	Purchase or Sale	Quantity	Transaction Date	Price per Share (including commission)		How Effected
Relational Investors LLC	Purchase	137	8/28/2013	$	74.02	Open Market
Relational Investors LLC	Purchase	556	8/28/2013	$	74.01	Open Market
Relational Investors LLC	Purchase	172	8/28/2013	$	74.01	Open Market
Relational Investors LLC	Purchase	627	8/28/2013	$	74.02	Open Market
Relational Investors LLC	Purchase	2,545	8/28/2013	$	74.01	Open Market
Relational Investors LLC	Purchase	786	8/28/2013	$	74.01	Open Market
Relational Fund Partners, L.P.	Purchase	9	8/28/2013	$	74.02	Open Market
Relational Fund Partners, L.P.	Purchase	40	8/28/2013	$	74.01	Open Market
Relational Fund Partners, L.P.	Purchase	12	8/28/2013	$	74.01	Open Market
Relational Investors IX, L.P.	Purchase	116	8/28/2013	$	74.02	Open Market
Relational Investors IX, L.P.	Purchase	50	8/28/2013	$	74.02	Open Market
Relational Investors IX, L.P.	Purchase	673	8/28/2013	$	74.01	Open Market
Relational Investors IX, L.P.	Purchase	208	8/28/2013	$	74.01	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	5,098	8/28/2013	$	74.02	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	20,670	8/28/2013	$	74.01	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	6,389	8/28/2013	$	74.01	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	5,189	8/28/2013	$	74.02	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	21,023	8/28/2013	$	74.01	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	6,502	8/28/2013	$	74.01	Open Market
Relational Investors XV, L.P.	Purchase	115	8/28/2013	$	74.02	Open Market
Relational Investors XV, L.P.	Purchase	467	8/28/2013	$	74.01	Open Market
Relational Investors XV, L.P.	Purchase	144	8/28/2013	$	74.01	Open Market
Relational Investors XVI, L.P.	Purchase	65	8/28/2013	$	74.02	Open Market
Relational Investors XVI, L.P.	Purchase	263	8/28/2013	$	74.01	Open Market
Relational Investors XVI, L.P.	Purchase	81	8/28/2013	$	74.01	Open Market
Relational Investors XX, L.P.	Purchase	66	8/28/2013	$	74.02	Open Market
Relational Investors XX, L.P.	Purchase	269	8/28/2013	$	74.01	Open Market
Relational Investors XX, L.P.	Purchase	83	8/28/2013	$	74.01	Open Market
Relational Investors XXIII, L.P.	Purchase	72	8/28/2013	$	74.02	Open Market
Relational Investors XXIII, L.P.	Purchase	295	8/28/2013	$	74.01	Open Market
Relational Investors XXIII, L.P.	Purchase	91	8/28/2013	$	74.01	Open Market
Relational Investors XXIV, L.P.	Purchase	165	8/28/2013	$	74.02	Open Market
Relational Investors XXIV, L.P.	Purchase	670	8/28/2013	$	74.01	Open Market
Relational Investors XXIV, L.P.	Purchase	207	8/28/2013	$	74.01	Open Market
RH Fund 1, L.P.	Purchase	100	8/28/2013	$	74.02	Open Market
RH Fund 1, L.P.	Purchase	406	8/28/2013	$	74.01	Open Market
RH Fund 1, L.P.	Purchase	125	8/28/2013	$	74.01	Open Market
Relational Investors LLC	Purchase	59	8/29/2013	$	74.02	Open Market
Relational Investors LLC	Purchase	272	8/29/2013	$	74.02	Open Market
Relational Fund Partners, L.P.	Purchase	3	8/29/2013	$	74.02	Open Market
Relational Investors IX, L.P.	Purchase	50	8/29/2013	$	74.02	Open Market
Relational Investors IX, L.P.	Purchase	22	8/29/2013	$	74.02	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	2,213	8/29/2013	$	74.02	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	2,257	8/29/2013	$	74.02	Open Market
Relational Investors XV, L.P.	Purchase	50	8/29/2013	$	74.02	Open Market
Relational Investors XVI, L.P.	Purchase	28	8/29/2013	$	74.02	Open Market
Relational Investors XX, L.P.	Purchase	28	8/29/2013	$	74.02	Open Market
Relational Investors XXIII, L.P.	Purchase	31	8/29/2013	$	74.02	Open Market
Relational Investors XXIV, L.P.	Purchase	71	8/29/2013	$	74.02	Open Market
RH Fund 1, L.P.	Purchase	43	8/29/2013	$	74.02	Open Market

Relational Investors LLC	Purchase	377	8/30/2013	$	74.00	Open Market
Relational Investors LLC	Purchase	1,637	8/30/2013	$	74.01	Open Market
Relational Investors LLC	Purchase	1,724	8/30/2013	$	74.00	Open Market
Relational Investors LLC	Purchase	7,486	8/30/2013	$	74.01	Open Market
Relational Fund Partners, L.P.	Purchase	27	8/30/2013	$	74.00	Open Market
Relational Fund Partners, L.P.	Purchase	123	8/30/2013	$	74.01	Open Market
Relational Investors IX, L.P.	Purchase	456	8/30/2013	$	74.00	Open Market
Relational Investors IX, L.P.	Purchase	1,387	8/30/2013	$	74.01	Open Market
Relational Investors IX, L.P.	Purchase	595	8/30/2013	$	74.01	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	14,005	8/30/2013	$	74.00	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	60,787	8/30/2013	$	74.01	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	14,244	8/30/2013	$	74.00	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	61,801	8/30/2013	$	74.01	Open Market
Relational Investors XV, L.P.	Purchase	316	8/30/2013	$	74.00	Open Market
Relational Investors XV, L.P.	Purchase	1,374	8/30/2013	$	74.01	Open Market
Relational Investors XVI, L.P.	Purchase	178	8/30/2013	$	74.00	Open Market
Relational Investors XVI, L.P.	Purchase	776	8/30/2013	$	74.01	Open Market
Relational Investors XX, L.P.	Purchase	182	8/30/2013	$	74.00	Open Market
Relational Investors XX, L.P.	Purchase	792	8/30/2013	$	74.01	Open Market
Relational Investors XXIII, L.P.	Purchase	200	8/30/2013	$	74.00	Open Market
Relational Investors XXIII, L.P.	Purchase	870	8/30/2013	$	74.01	Open Market
Relational Investors XXIV, L.P.	Purchase	454	8/30/2013	$	74.00	Open Market
Relational Investors XXIV, L.P.	Purchase	1,970	8/30/2013	$	74.01	Open Market
RH Fund 1, L.P.	Purchase	275	8/30/2013	$	74.00	Open Market
RH Fund 1, L.P.	Purchase	1,195	8/30/2013	$	74.01	Open Market

EX-99.B

Exhibit B

JOINT FILING AGREEMENT

In accordance with Rule 13d-l(k) under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them of a statement on Schedule 13D (including amendments thereto) with respect to the common stock, $10.00 par value, of SPX Corporation and further agree that this Joint Filing Agreement be included as an Exhibit to such joint filing.  In evidence thereof, the undersigned hereby execute this Agreement this 30th day of August, 2013.

RELATIONAL INVESTORS MID-CAP FUND I, L.P.
RELATIONAL INVESTORS MID-CAP FUND II, L.P.
RELATIONAL FUND PARTNERS, L.P.
RELATIONAL COAST PARTNERS, L.P.
RELATIONAL INVESTORS IX, L.P.
RELATIONAL INVESTORS XV, L.P.
RELATIONAL INVESTORS XVI, L.P.
RELATIONAL INVESTORS XX, L.P.
RELATIONAL INVESTORS XXIII, L.P.
RELATIONAL INVESTORS XXIV, L.P.

RH FUND 1, L.P.

By:	RELATIONAL INVESTORS, LLC
	as general partner to each,

	By:	/s/ Ralph V. Whitworth
		Ralph V. Whitworth, Principal
RELATIONAL INVESTORS, LLC
	By:	/s/ Ralph V. Whitworth
		Ralph V. Whitworth, Principal
/s/ Ralph V. Whitworth
Ralph V. Whitworth
/s/ David H. Batchelder
David H. Batchelder