As filed with the Securities and Exchange Commission on April 30, 2010.

Registration No 333-164484

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

AMENDMENT NO. 9

TO

FORM S-1

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933

RYERSON HOLDING CORPORATION

(Exact name of registrant as specified in its charter)

2621 West 15th Place

Chicago, Illinois 60608

(773) 762-2121

(Address, including zip code, and telephone number, including area code, of registrant’s principal executive offices)

Terence R. Rogers

Chief Financial Officer

Ryerson Holding Corporation

2621 West 15th Place

Chicago, Illinois 60608

(773) 762-2121

(Name, address, including zip code, and telephone number, including area code, of agent for service)

Copies to:

Approximate date of commencement of proposed sale to the public:

As soon as practicable after this Registration Statement becomes effective.

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act, check the following box.  ¨

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.  ¨

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.  ¨

If this Form is a post-effective amendment filed pursuant to Rule 462(d) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b2 of the Exchange Act.

The Registrant hereby amends this Registration Statement on such date or dates as may be necessary to delay its effective date until the Registrant shall file a further amendment which specifically states that this Registration Statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act of 1933, as amended, or until this Registration Statement shall become effective on such date as the Commission, acting pursuant to said Section 8(a), may determine.

Explanatory Note

The purpose of this Amendment No. 9 to Form S-1 Registration Statement (No. 333-164484) is to refile Exhibit 10.13 and to reflect such filing in the Index to Exhibits.

PART II

INFORMATION NOT REQUIRED IN PROSPECTUS

The following table sets forth the costs and expenses, other than the underwriting discounts and commissions, payable by Ryerson Holding Corporation (“Ryerson Holding”) in connection with the sale of common stock being registered. All amounts shown are estimates, except the SEC registration fee, the FINRA filing fee and the NYSE application fee.

Our amended and restated certificate of incorporation will limit our directors’ and officers’ liability to the fullest extent permitted under Delaware corporate law. Specifically, our directors and officers will not be liable to us or our stockholders for monetary damages for any breach of fiduciary duty by a director or officer, except for liability:

If the Delaware General Corporation Law is amended to authorize corporate action further eliminating or limiting the personal liability of directors or officers, then the liability of our directors and officers shall be eliminated or limited to the fullest extent permitted by the Delaware General Corporation Law, as so amended.

The provision regarding indemnification of our directors and officers in our amended and restated certificate of incorporation will generally not limit liability under state or federal securities laws.

Delaware law and our amended and restated certificate of incorporation provide that we will, in certain situations, indemnify any person made or threatened to be made a party to a proceeding by reason of that person’s former or present official capacity with our company against judgments, penalties, fines, settlements and reasonable expenses including reasonable attorney’s fees. Any person is also entitled, subject to certain limitations, to payment or reimbursement of reasonable expenses in advance of the final disposition of the proceeding. In addition, certain employment agreements to which we are a party provide for the indemnification of our employees who are party thereto.

We also maintain a directors’ and officers’ insurance policy pursuant to which our directors and officers are insured against liability for actions taken in their capacities as directors and officers.

II-1

On January 29, 2010, Ryerson Holding completed an offering of $483 million aggregate principal amount at maturity of 14 ¹/2% Senior Discount Notes due 2015 to qualified institutional buyers in reliance on Rule 144A under the Securities Act of 1933, as amended. Banc of America Securities LLC and UBS Securities LLC were the Joint Book-Running Managers in connection with the sale of the notes. Ryerson Holding received net proceeds from the offering in the amount of approximately $215 million and the initial purchasers’ discount was 2.25% of the gross proceeds received by Ryerson Holding from the sale of the notes.

See Exhibit Index attached to this registration statement, which is incorporated by reference herein.

See the following attached Financial Statement Schedules:

All other schedules are omitted since the required information is not present or is not present in amounts sufficient to require submission of the schedules.

(a) The undersigned registrant hereby undertakes to provide to the underwriters at the closing specified in the underwriting agreement certificates in such denominations and registered in such names as required by the underwriters to permit prompt delivery to each purchaser.

(b) Insofar as indemnification for liabilities arising under the Securities Act of 1933 may be permitted to directors, officers and controlling persons of the registrant pursuant to our amended and restated certificate of incorporation or bylaws, or otherwise, the registrant has been advised that in the opinion of the Securities and Exchange Commission such indemnification is against public policy as expressed in the Securities Act and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the registrant of expenses incurred or paid by a director, officer or controlling person of the registrant in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered, the registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Securities Act and will be governed by the final adjudication of such issue.

(c) The undersigned registrant hereby undertakes that:

(1) For purposes of determining any liability under the Securities Act of 1933, the information omitted from the form of prospectus filed as part of this registration statement in reliance upon Rule 430A and contained in a form of prospectus filed by the registrant pursuant to Rule 424(b)(1) or (4) or 497(h) under the Securities Act shall be deemed to be part of this registration statement as of the time it was declared effective; and

(2) For the purpose of determining any liability under the Securities Act of 1933, each post-effective amendment that contains a form of prospectus shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

II-2

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the registrant has duly caused this Amendment No. 9 to its Registration Statement on Form S-1 to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of New York, in the State of New York, on this 30th day of April, 2010.

Pursuant to the requirements of the Securities Act of 1933, this Amendment No. 9 to its Registration Statement on Form S-1 has been signed by the following persons in the capacities and on the dates indicated.

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INDEX TO EXHIBITS