AK Steel Holding (AKS)

Registrant’s telephone number, including area code: (513) 425-5000

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

AK Steel Holding Corporation is hereby furnishing the following information under Regulation FD:

On July 24, 2007, AK Steel Corporation issued a press release, a copy of which is attached hereto as Exhibit No. 99.1 and incorporated by reference herein, announcing that it will redeem the remaining $150 million of its outstanding 7 7/8% Senior Notes Due February 15, 2009.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated: July 24, 2007

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Registrant’s telephone number, including area code: (513) 425-5000

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

On July 24, 2007, AK Steel Holding Corporation issued a press release, a copy of which is attached hereto as Exhibit No. 99.1 and incorporated by reference herein, regarding its financial results for the second quarter 2007.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated: July 24, 2007

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Registrant’s telephone number, including area code: (513) 425-5000

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

AK Steel Holding Corporation is hereby furnishing the following information under Regulation FD:

On July 23, 2007, AK Steel Corporation issued a press release, a copy of which is attached hereto as Exhibit No. 99.1 and incorporated by reference herein, announcing that its board of directors has authorized the company to make an early $70 million contribution to its pension trust fund.

(d) Exhibit:

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated: July 23, 2007

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Registrant’s telephone number, including area code: (513) 425-5000

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

On July 19, 2007, the Board of Directors (the “Board) of AK Steel Holding Corporation (the “Company”) expanded its number of authorized directors from nine to ten and elected Mr. Ralph S. Michael III to fill the vacancy thereby created and to be a director of the Company, effective July 20, 2007. Mr. Michael currently serves as the President and Chief Operating Officer of the Ohio Casualty Insurance Company. On July 20, 2007, the Company issued a press release, a copy of which is attached hereto as Exhibit 99.1 and incorporated by reference herein, announcing Mr. Michael’s election. Mr. Michael has not yet been appointed to any committee of the Board.

Mr. Michael will be compensated in accordance with the Company’s standard compensation policies and practices for the Board as disclosed in the Company’s Proxy Statement dated April 16, 2007.

99.1 Press Release issued on July 20, 2007

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated: July 20, 2007

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Registrant’s telephone number, including area code: (513) 425-5000

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

AK Steel Holding Corporation is hereby furnishing the following information under Regulation FD:

On July 9, 2007, AK Steel Corporation issued a press release, a copy of which is attached hereto as Exhibit No. 99.1 and incorporated by reference herein, announcing that members of the United Auto Workers (UAW), Local 3044, have ratified a new six-year labor agreement covering about 190 hourly production employees at the company’s Rockport (IN) Works. The new agreement takes effect August 1, 2007 and runs through September 30, 2013.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated: July 11, 2007

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Registrant’s telephone number, including area code: (513) 425-5000

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

AK Steel Holding Corporation is hereby furnishing the following information under Regulation FD:

On June 29, 2007, AK Steel Corporation issued a press release, a copy of which is attached hereto as Exhibit No. 99.1 and incorporated by reference herein, announcing that the company and the United Auto Workers (UAW) have reached a tentative agreement on a new labor contract covering about 190 hourly production and maintenance employees at the company’s Rockport (IN) Works.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated: July 2, 2007

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Registrant’s telephone number, including area code: (513) 425-5000

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

AK Steel Holding Corporation is hereby furnishing the following information under Regulation FD:

On April 24, 2007, AK Steel Corporation issued a press release, a copy of which is attached hereto as Exhibit No. 99.1 and incorporated by reference herein, announcing that it will redeem another $75 million of its outstanding 7 7/8% Senior Notes Due February 15, 2009.

(d) Exhibit:

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated: April 24, 2007

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Registrant’s telephone number, including area code: (513) 425-5000

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

On April 24, 2007, AK Steel Holding Corporation issued a press release, a copy of which is attached hereto as Exhibit No. 99.1 and incorporated by reference herein, regarding its financial results for the first quarter 2007.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated: April 24, 2007

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Registrant’s telephone number, including area code: (513) 425-5000

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

AK Steel Holding Corporation is hereby furnishing the following information under Regulation FD:

On April 23, 2007, AK Steel Corporation issued a press release, a copy of which is attached hereto as Exhibit No. 99.1 and incorporated by reference herein, announcing that its board of directors has authorized the company to make an early $105 million contribution to its pension trust fund.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated: April 23, 2007

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Registrant’s telephone number, including area code: (513) 425-5000

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

AK Steel Holding Corporation is hereby furnishing the following information under Regulation FD:

On March 14, 2007, AK Steel Corporation issued a press release, a copy of which is attached hereto as Exhibit No. 99.1 and incorporated by reference herein, announcing that members of the International Association of Machinists and Aerospace Workers (IAM), Local Lodge 1943, have ratified a 54-month, new-era labor agreement covering about 1,700 hourly production and maintenance employees at the company’s Middletown (OH) Works. The new agreement takes effect March 15, 2007 and runs through September 15, 2011.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

EXHIBIT INDEX

Registrant’s telephone number, including area code: (513) 425-5000

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

Item 7.01 Regulation FD Disclosure.

AK Steel Holding Corporation is hereby furnishing the following information under Regulation FD:

On February 28, 2007, AK Steel Corporation issued a press release, a copy of which is attached hereto as Exhibit No. 99.1 and incorporated by reference herein, announcing that the company and the International Association of Machinists and Aerospace Workers (the “IAM”) have reached a tentative agreement on a new labor contract covering about 1,750 hourly production and maintenance employees at the company’s Middletown (OH) Works.

Item 9.01 Financial Statements and Exhibits.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated: February 28, 2007

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Registrant’s telephone number, including area code: (513) 425-5000

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

Item 7.01 Regulation FD Disclosure.

AK Steel Holding Corporation is hereby furnishing the following information under Regulation FD:

On February 23, 2007, AK Steel Corporation issued a press release, a copy of which is attached hereto as Exhibit No. 99.1 and incorporated by reference herein, announcing that the members of the United Autoworkers (UAW) Local 3462 have ratified a new three-year labor agreement covering about 380 hourly production and maintenance employees at the company’s Coshocton (OH) Works. The new agreement will be in effect from March 1, 2007 through March 31, 2010, and replaces an agreement that would have expired April 1.

Item 9.01 Financial Statements and Exhibits.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated: February 26, 2007

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