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

	SCHEDULE 13D

Under the Securities Exchange Act of 1934
(Amendment No. 2)*

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)

May 2, 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 6,387,833

			8.	Shared Voting Power -0-

			9.	Sole Dispositive Power 6,387,833

			10.	Shared Dispositive Power -0-

	11.	Aggregate Amount Beneficially Owned by Each Reporting Person 6,387,833

	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) 13.65%

	14.	Type of Reporting Person (See Instructions) IA/HC/OO

	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 1,559,901

			8.	Shared Voting Power -0-

			9.	Sole Dispositive Power 1,559,901

			10.	Shared Dispositive Power -0-

	11.	Aggregate Amount Beneficially Owned by Each Reporting Person 1,559,901

	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) 3.33%

	14.	Type of Reporting Person (See Instructions) PN

	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 1,167,317

			8.	Shared Voting Power -0-

			9.	Sole Dispositive Power 1,167,317

			10.	Shared Dispositive Power -0-

	11.	Aggregate Amount Beneficially Owned by Each Reporting Person 1,167,317

	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) 2.49%

	14.	Type of Reporting Person (See Instructions) PN

	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 18,196

			8.	Shared Voting Power -0-

			9.	Sole Dispositive Power 18,196

			10.	Shared Dispositive Power -0-

	11.	Aggregate Amount Beneficially Owned by Each Reporting Person 18,196

	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

	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 301,715

			8.	Shared Voting Power -0-

			9.	Sole Dispositive Power 301,715

			10.	Shared Dispositive Power -0-

	11.	Aggregate Amount Beneficially Owned by Each Reporting Person 301,715

	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) 0.64%

	14.	Type of Reporting Person (See Instructions) PN

	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 336,316

			8.	Shared Voting Power -0-

			9.	Sole Dispositive Power 336,316

			10.	Shared Dispositive Power -0-

	11.	Aggregate Amount Beneficially Owned by Each Reporting Person 336,316

	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) 0.72%

	14.	Type of Reporting Person (See Instructions) PN

	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 191,812

			8.	Shared Voting Power -0-

			9.	Sole Dispositive Power 191,812

			10.	Shared Dispositive Power -0-

	11.	Aggregate Amount Beneficially Owned by Each Reporting Person 191,812

	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

	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 93,629

			8.	Shared Voting Power -0-

			9.	Sole Dispositive Power 93,629

			10.	Shared Dispositive Power -0-

	11.	Aggregate Amount Beneficially Owned by Each Reporting Person 93,629

	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) 0.20%

	14.	Type of Reporting Person (See Instructions) PN

	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 173,499

			8.	Shared Voting Power -0-

			9.	Sole Dispositive Power 173,499

			10.	Shared Dispositive Power -0-

	11.	Aggregate Amount Beneficially Owned by Each Reporting Person 173,499

	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) 0.37%

	14.	Type of Reporting Person (See Instructions) PN

	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 246,939

			8.	Shared Voting Power -0-

			9.	Sole Dispositive Power 246,939

			10.	Shared Dispositive Power -0-

	11.	Aggregate Amount Beneficially Owned by Each Reporting Person 246,939

	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) 0.53%

	14.	Type of Reporting Person (See Instructions) PN

	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 124,410

			8.	Shared Voting Power -0-

			9.	Sole Dispositive Power 124,410

			10.	Shared Dispositive Power -0-

	11.	Aggregate Amount Beneficially Owned by Each Reporting Person 124,410

	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) 0.27%

	14.	Type of Reporting Person (See Instructions) PN

	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 6,387,833

			9.	Sole Dispositive Power -0-

			10.	Shared Dispositive Power 6,387,833

	11.	Aggregate Amount Beneficially Owned by Each Reporting Person 6,387,833

	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) 13.65%

	14.	Type of Reporting Person (See Instructions) IN

	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 6,387,833

			9.	Sole Dispositive Power -0-

			10.	Shared Dispositive Power 6,387,833

	11.	Aggregate Amount Beneficially Owned by Each Reporting Person 6,387,833

	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) 13.65%

	14.	Type of Reporting Person (See Instructions) IN

Item 1. Security and Issuer

This Schedule 13D/A constitutes the second 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 filed by the Reporting Persons with the SEC on March 25, 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”) 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 2,174,099 Shares for a total consideration (including brokerage commissions) of $164.7 million derived from capital of RILLC and the Managed Accounts.

The Relational LPs purchased an aggregate of 4,213,734 Shares for total consideration (including brokerage commissions) of $310.6 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.

Item 5. Interest in Securities of the Issuer

(a) As of the date of this Statement, the Reporting Persons beneficially owned in the aggregate 6,387,833 Shares, constituting 13.65% of the outstanding Shares. The percentage of Shares owned is based upon 46,793,441 Shares outstanding on April 26, 2013, as set forth in the Issuer’s Form 10-Q for the quarter ended March 31, 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	2,174,099	4.65	%	Sole
MC I	1,559,901	3.33	%	Sole
MC II	1,167,317	2.49	%	Sole
RFP	18,196	0.04	%	Sole
RCP	301,715	0.64	%	Sole
RI IX	336,316	0.72	%	Sole
RI XV	191,812	0.41	%	Sole
RI XVI	93,629	0.20	%	Sole
RI XX	173,499	0.37	%	Sole
RI XXIII	246,939	0.53	%	Sole
RHF 1	124,410	0.27	%	Sole

RILLC, individually and in its capacity as an investment adviser, may be deemed to possess direct beneficial ownership of the 2,174,099 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 4,213,734 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.

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: May 6, 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.
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

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	Sale	1,970	4/29/2013	$	74.58	Open Market
Relational Investors LLC	Sale	960	4/29/2013	$	74.62	Open Market
Relational Investors LLC	Sale	1,010	4/29/2013	$	74.43	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	9,525	4/29/2013	$	74.58	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	4,393	4/29/2013	$	74.58	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	6,787	4/29/2013	$	74.62	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	7,131	4/29/2013	$	74.43	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	4,213	4/29/2013	$	74.58	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	6,315	4/29/2013	$	74.58	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	5,134	4/29/2013	$	74.62	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	1,110	4/29/2013	$	74.43	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	4,285	4/29/2013	$	74.43	Open Market
Relational Investors LLC	Sale	4,565	4/29/2013	$	74.58	Open Market
Relational Investors LLC	Sale	2,227	4/29/2013	$	74.62	Open Market
Relational Investors LLC	Sale	2,339	4/29/2013	$	74.43	Open Market
Relational Coast Partners, L.P.	Sale	2,554	4/29/2013	$	74.58	Open Market
Relational Coast Partners, L.P.	Sale	1,246	4/29/2013	$	74.62	Open Market
Relational Coast Partners, L.P.	Sale	1,308	4/29/2013	$	74.43	Open Market
Relational Fund Partners, L.P.	Sale	142	4/29/2013	$	74.58	Open Market
Relational Fund Partners, L.P.	Sale	67	4/29/2013	$	74.62	Open Market
Relational Fund Partners, L.P.	Sale	72	4/29/2013	$	74.43	Open Market
Relational Investors XV, L.P.	Sale	1,397	4/29/2013	$	74.58	Open Market
Relational Investors XV, L.P.	Sale	681	4/29/2013	$	74.62	Open Market
Relational Investors XV, L.P.	Sale	716	4/29/2013	$	74.43	Open Market
Relational Investors XVI, L.P.	Sale	608	4/29/2013	$	74.58	Open Market
Relational Investors XVI, L.P.	Sale	296	4/29/2013	$	74.62	Open Market
Relational Investors XVI, L.P.	Sale	312	4/29/2013	$	74.43	Open Market
Relational Investors XX, L.P.	Sale	1,182	4/29/2013	$	74.58	Open Market
Relational Investors XX, L.P.	Sale	576	4/29/2013	$	74.62	Open Market
Relational Investors XX, L.P.	Sale	606	4/29/2013	$	74.43	Open Market
Relational Investors XXIII, L.P.	Sale	1,676	4/29/2013	$	74.58	Open Market
Relational Investors XXIII, L.P.	Sale	817	4/29/2013	$	74.62	Open Market
Relational Investors XXIII, L.P.	Sale	859	4/29/2013	$	74.43	Open Market
Relational Investors IX, L.P.	Sale	1,934	4/29/2013	$	74.58	Open Market
Relational Investors IX, L.P.	Sale	829	4/29/2013	$	74.58	Open Market
Relational Investors IX, L.P.	Sale	1,348	4/29/2013	$	74.62	Open Market
Relational Investors IX, L.P.	Sale	1,416	4/29/2013	$	74.43	Open Market
Relational Investors LLC	Sale	8,697	4/29/2013	$	74.58	Open Market
Relational Investors LLC	Sale	4,240	4/29/2013	$	74.62	Open Market
Relational Investors LLC	Sale	4,457	4/29/2013	$	74.43	Open Market
Relational Investors LLC	Purchase	2,215	5/1/2013	$	68.14	Open Market
Relational Investors LLC	Purchase	3,010	5/1/2013	$	68.15	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	7,477	5/1/2013	$	68.14	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	10,163	5/1/2013	$	68.15	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	5,332	5/1/2013	$	68.14	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	7,247	5/1/2013	$	68.15	Open Market
Relational Investors LLC	Purchase	11,235	5/1/2013	$	68.14	Open Market

Relational Investors LLC	Purchase	15,265	5/1/2013	$	68.15	Open Market
Relational Coast Partners, L.P.	Purchase	1,767	5/1/2013	$	68.14	Open Market
Relational Coast Partners, L.P.	Purchase	2,402	5/1/2013	$	68.15	Open Market
Relational Fund Partners, L.P.	Purchase	137	5/1/2013	$	68.14	Open Market
Relational Fund Partners, L.P.	Purchase	187	5/1/2013	$	68.15	Open Market
RH Fund 1, L.P.	Purchase	3,174	5/1/2013	$	68.14	Open Market
RH Fund 1, L.P.	Purchase	4,315	5/1/2013	$	68.15	Open Market
Relational Investors XV, L.P.	Purchase	1,649	5/1/2013	$	68.14	Open Market
Relational Investors XV, L.P.	Purchase	2,241	5/1/2013	$	68.15	Open Market
Relational Investors XVI, L.P.	Purchase	976	5/1/2013	$	68.14	Open Market
Relational Investors XVI, L.P.	Purchase	1,327	5/1/2013	$	68.15	Open Market
Relational Investors XX, L.P.	Purchase	1,682	5/1/2013	$	68.14	Open Market
Relational Investors XX, L.P.	Purchase	2,286	5/1/2013	$	68.15	Open Market
Relational Investors XXIII, L.P.	Purchase	2,408	5/1/2013	$	68.14	Open Market
Relational Investors XXIII, L.P.	Purchase	3,273	5/1/2013	$	68.15	Open Market
Relational Investors IX, L.P.	Purchase	2,164	5/1/2013	$	68.14	Open Market
Relational Investors IX, L.P.	Purchase	2,941	5/1/2013	$	68.15	Open Market
Relational Investors LLC	Purchase	6,652	5/1/2013	$	68.14	Open Market
Relational Investors LLC	Purchase	9,042	5/1/2013	$	68.15	Open Market
Relational Investors LLC	Purchase	23,277	5/2/2013	$	70.25	Open Market
Relational Investors LLC	Purchase	5,671	5/2/2013	$	69.66	Open Market
Relational Investors LLC	Purchase	2,955	5/2/2013	$	70.28	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	78,578	5/2/2013	$	70.25	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	19,143	5/2/2013	$	69.66	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	9,977	5/2/2013	$	70.28	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	56,036	5/2/2013	$	70.25	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	13,651	5/2/2013	$	69.66	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	7,115	5/2/2013	$	70.28	Open Market
Relational Investors LLC	Purchase	117,979	5/2/2013	$	70.25	Open Market
Relational Investors LLC	Purchase	28,745	5/2/2013	$	69.66	Open Market
Relational Investors LLC	Purchase	14,985	5/2/2013	$	70.28	Open Market
Relational Coast Partners, L.P.	Purchase	18,573	5/2/2013	$	70.25	Open Market
Relational Coast Partners, L.P.	Purchase	4,525	5/2/2013	$	69.66	Open Market
Relational Coast Partners, L.P.	Purchase	2,358	5/2/2013	$	70.28	Open Market
Relational Fund Partners, L.P.	Purchase	1,455	5/2/2013	$	70.25	Open Market
Relational Fund Partners, L.P.	Purchase	354	5/2/2013	$	69.66	Open Market
Relational Fund Partners, L.P.	Purchase	184	5/2/2013	$	70.28	Open Market
RH Fund 1, L.P.	Purchase	33,363	5/2/2013	$	70.25	Open Market
RH Fund 1, L.P.	Purchase	8,128	5/2/2013	$	69.66	Open Market
RH Fund 1, L.P.	Purchase	4,236	5/2/2013	$	70.28	Open Market
Relational Investors XV, L.P.	Purchase	17,334	5/2/2013	$	70.25	Open Market
Relational Investors XV, L.P.	Purchase	4,223	5/2/2013	$	69.66	Open Market
Relational Investors XV, L.P.	Purchase	2,201	5/2/2013	$	70.28	Open Market
Relational Investors XVI, L.P.	Purchase	10,266	5/2/2013	$	70.25	Open Market
Relational Investors XVI, L.P.	Purchase	2,501	5/2/2013	$	69.66	Open Market
Relational Investors XVI, L.P.	Purchase	1,303	5/2/2013	$	70.28	Open Market
Relational Investors XX, L.P.	Purchase	17,680	5/2/2013	$	70.25	Open Market

Relational Investors XX, L.P.	Purchase	4,307	5/2/2013	$	69.66	Open Market
Relational Investors XX, L.P.	Purchase	2,244	5/2/2013	$	70.28	Open Market
Relational Investors XXIII, L.P.	Purchase	25,309	5/2/2013	$	70.25	Open Market
Relational Investors XXIII, L.P.	Purchase	6,165	5/2/2013	$	69.66	Open Market
Relational Investors XXIII, L.P.	Purchase	3,213	5/2/2013	$	70.28	Open Market
Relational Investors IX, L.P.	Purchase	15,918	5/2/2013	$	70.25	Open Market
Relational Investors IX, L.P.	Purchase	6,822	5/2/2013	$	70.25	Open Market
Relational Investors IX, L.P.	Purchase	5,540	5/2/2013	$	69.66	Open Market
Relational Investors IX, L.P.	Purchase	2,887	5/2/2013	$	70.28	Open Market
Relational Investors LLC	Purchase	69,910	5/2/2013	$	70.25	Open Market
Relational Investors LLC	Purchase	17,031	5/2/2013	$	69.66	Open Market
Relational Investors LLC	Purchase	8,876	5/2/2013	$	70.28	Open Market
Relational Investors LLC	Purchase	18,978	5/3/2013	$	73.12	Open Market
Relational Investors LLC	Purchase	7,590	5/3/2013	$	73.17	Open Market
Relational Investors LLC	Purchase	13,830	5/3/2013	$	73.16	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	64,063	5/3/2013	$	73.12	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	25,623	5/3/2013	$	73.17	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	46,687	5/3/2013	$	73.16	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	45,684	5/3/2013	$	73.12	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	18,272	5/3/2013	$	73.17	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	33,293	5/3/2013	$	73.16	Open Market
Relational Investors LLC	Purchase	96,181	5/3/2013	$	73.12	Open Market
Relational Investors LLC	Purchase	38,477	5/3/2013	$	73.17	Open Market
Relational Investors LLC	Purchase	70,099	5/3/2013	$	73.16	Open Market
Relational Coast Partners, L.P.	Purchase	15,143	5/3/2013	$	73.12	Open Market
Relational Coast Partners, L.P.	Purchase	6,056	5/3/2013	$	73.17	Open Market
Relational Coast Partners, L.P.	Purchase	11,035	5/3/2013	$	73.16	Open Market
Relational Fund Partners, L.P.	Purchase	1,187	5/3/2013	$	73.12	Open Market
Relational Fund Partners, L.P.	Purchase	474	5/3/2013	$	73.17	Open Market
Relational Fund Partners, L.P.	Purchase	865	5/3/2013	$	73.16	Open Market
RH Fund 1, L.P.	Purchase	27,200	5/3/2013	$	73.12	Open Market
RH Fund 1, L.P.	Purchase	10,879	5/3/2013	$	73.17	Open Market
RH Fund 1, L.P.	Purchase	19,822	5/3/2013	$	73.16	Open Market
Relational Investors XV, L.P.	Purchase	14,132	5/3/2013	$	73.12	Open Market
Relational Investors XV, L.P.	Purchase	5,652	5/3/2013	$	73.17	Open Market
Relational Investors XV, L.P.	Purchase	10,299	5/3/2013	$	73.16	Open Market
Relational Investors XVI, L.P.	Purchase	8,369	5/3/2013	$	73.12	Open Market
Relational Investors XVI, L.P.	Purchase	3,347	5/3/2013	$	73.17	Open Market
Relational Investors XVI, L.P.	Purchase	6,099	5/3/2013	$	73.16	Open Market
Relational Investors XX, L.P.	Purchase	14,415	5/3/2013	$	73.12	Open Market
Relational Investors XX, L.P.	Purchase	5,765	5/3/2013	$	73.17	Open Market
Relational Investors XX, L.P.	Purchase	10,505	5/3/2013	$	73.16	Open Market
Relational Investors XXIII, L.P.	Purchase	20,634	5/3/2013	$	73.12	Open Market
Relational Investors XXIII, L.P.	Purchase	8,253	5/3/2013	$	73.17	Open Market
Relational Investors XXIII, L.P.	Purchase	15,037	5/3/2013	$	73.16	Open Market
Relational Investors IX, L.P.	Purchase	18,539	5/3/2013	$	73.12	Open Market
Relational Investors IX, L.P.	Purchase	5,190	5/3/2013	$	73.17	Open Market
Relational Investors IX, L.P.	Purchase	2,225	5/3/2013	$	73.17	Open Market
Relational Investors IX, L.P.	Purchase	13,511	5/3/2013	$	73.16	Open Market
Relational Investors LLC	Purchase	56,996	5/3/2013	$	73.12	Open Market
Relational Investors LLC	Purchase	22,797	5/3/2013	$	73.17	Open Market
Relational Investors LLC	Purchase	41,537	5/3/2013	$	73.16	Open Market
Relational Investors LLC	Purchase	9,274	5/6/2013	$	73.76	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	31,307	5/6/2013	$	73.76	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	22,326	5/6/2013	$	73.76	Open Market
Relational Investors LLC	Purchase	47,000	5/6/2013	$	73.76	Open Market
Relational Coast Partners, L.P.	Purchase	7,400	5/6/2013	$	73.76	Open Market
Relational Fund Partners, L.P.	Purchase	580	5/6/2013	$	73.76	Open Market
RH Fund 1, L.P.	Purchase	13,293	5/6/2013	$	73.76	Open Market
Relational Investors XV, L.P.	Purchase	6,907	5/6/2013	$	73.76	Open Market
Relational Investors XVI, L.P.	Purchase	4,091	5/6/2013	$	73.76	Open Market
Relational Investors XX, L.P.	Purchase	7,045	5/6/2013	$	73.76	Open Market
Relational Investors XXIII, L.P.	Purchase	10,084	5/6/2013	$	73.76	Open Market
Relational Investors IX, L.P.	Purchase	9,060	5/6/2013	$	73.76	Open Market
Relational Investors LLC	Purchase	27,854	5/6/2013	$	73.76	Open Market

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 6th day of May, 2013.

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

Under the Securities Exchange Act of 1934 (Amendment No. 2)*

Under the Securities Exchange Act of 1934
(Amendment No. 2)*