UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 OR 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported) October 18, 2017

KMG Chemicals, Inc.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code 817-761-6100

(Former name or former address, if changed since last report.)

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:

Indicate by check mark whether the registrant is an emerging growth company as defined in as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐

Section 1 — Registrant’s Business and Operations

On October 18, 2017, KMG Chemicals, Inc. (the “Company”) entered into an underwriting agreement (the “Underwriting Agreement”) with Goldman Sachs & Co. LLC, as representative of the several underwriters listed in Schedule I thereto (collectively, the “Underwriters”), providing for the offer and sale in a firm commitment offering of 3,000,000 shares of the Company’s common stock, par value $0.01 per share (the “Common Stock”), at a public offering price of $54.00 per share of Common Stock. Pursuant to the Underwriting Agreement, the Company granted the Underwriters a 30-day option to purchase up to 450,000 additional shares of Common Stock at the same price. The offer and sale of the Common Stock is registered under the Securities Act of 1933, as amended (the “Securities Act”), pursuant to the Company’s shelf registration statement on Form S-3 (File No. 333-217185), which was filed with the Securities and Exchange Commission on April 7, 2017 and declared effective on April 17, 2017. The Company expects the transaction to close on or about October 23, 2017.

In the Underwriting Agreement, the Company agreed to indemnify the Underwriters against certain liabilities, including liabilities under the Securities Act, or to contribute to payments the Underwriters may be required to make because of any of those liabilities. The foregoing description of the Underwriting Agreement is qualified by reference to the complete document, which is filed as Exhibit 1.1 to this Form 8-K and is incorporated herein by reference.

Section 7 — Regulation FD

On October 18, 2017, the Company issued a press release announcing that it had priced the offering of the 3,000,000 shares of Common Stock. A copy of the press release is furnished as Exhibit 99.1 hereto and is incorporated herein by reference.

The information set forth in the attached Exhibit 99.1 shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or incorporated by reference in any filing under the Securities Act or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Section 9 — 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.