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): June 4, 2012

ZAYO GROUP, LLC

(Exact name of registrant as specified in its charter)

400 Centennial Parkway, Suite 200, Louisville, CO 80027

(Address of Principal Executive Offices)

(303) 381-4683

(Registrant’s Telephone Number, Including Area Code)

Check the appropriate box below if the Form 8-K is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Section 7 – Regulation FD

Item 7.01 Regulation FD Disclosure

On March 19, 2012, Zayo Group LLC (“Zayo” or the “Company”) filed a Form 8-K announcing its entrance into an Agreement and Plan of Merger (the “Agreement”) to acquire (the “Acquisition”) AboveNet Inc. (“AboveNet”). In conjunction with the Acquisition, the Company anticipates refinancing its existing indebtedness and raising additional debt to fund the $2.3 billion Acquisition. The Company has commitment letters in support of a $3.0 billion debt facility (the “Facility”).

Cash Tender Offer and Consent Solicitation

On June 4, 2012, the Company commenced a cash tender offer and consent solicitation (the “Tender Offer”) for any and all of the Company’s outstanding 10.25% senior secured first-priority notes due 2017 (the “Existing Notes”). The Tender Offer is described in an Offer to Purchase and Consent Solicitation Statement dated June 4, 2012 (the “Offer to Purchase”). The Company expect to purchase the Existing Notes tendered pursuant to the Tender Offer concurrently with the consummation of the AboveNet acquisition. The Tender Offer will expire at 12:00 midnight (one minute after 11:59 p.m.), New York City time, on June 29, 2012, unless extended or earlier terminated. In connection with the Tender Offer, the Company is soliciting consents to amend certain portions of the indenture under which the Existing Notes were issued. The proposed amendments would eliminate most of the restrictive covenants and certain of the events of default in that indenture and release the collateral securing the obligations of the Company, Zayo Capital, Inc., a co-issuer of the Existing Notes, and the Guarantors under the Existing Notes. Morgan Stanley & Co. LLC is acting as the dealer manager and solicitation agent for the Tender Offer.

The Tender Offer and Consent Solicitation are subject to a number of conditions that are set forth in the Offer to Purchase, including, without limitation, (i) the consummation of the Acquisition, (ii) the receipt of the required consents to adopt all of the proposed amendments and supplement the Indenture, (iii) the execution and delivery of a supplemental indenture effecting such amendments by the applicable parties, and (iv) obtaining satisfactory financing arrangements in an amount that, when combined with cash on hand, will be sufficient to fund the purchase price for the Acquisition and pay the total consideration for the Existing Notes tendered in the Tender Offer, all as more fully described in the Offer to Purchase.

On June 4, 2012 the Company issued a press release announcing the commencement of the Tender Offer. A copy of the press release is attached hereto as Exhibit 99.1.

Other Regulation FD disclosures

Morgan Stanley Senior Funding, Inc. and Barclays Bank PLC (collectively the “Lead Arrangers”), in their capacity as Lead Arrangers of the Facility, anticipate distributing marketing materials to potential investors in the Facility. The Lead Arrangers intend to communicate to potential investors certain financial data of the combined entities which has not been made publicly available. The Company is issuing this filing on Form 8-K in order to make publicly available the financial information which may be used by the Lead Arrangers in their marketing material for purposes of soliciting potential investors in the Facility.

Financing of AboveNet Acquisition

The Acquisition of AboveNet is not subject to any financing conditions. Morgan Stanley Senior Funding, Inc. and Barclays Bank PLC have committed to provide the Company with sufficient debt financing that together with equity commitments will allow the Company to consummate the Acquisition and repay or refinance certain existing indebtedness of the Company and AboveNet. The commitments are subject to customary conditions, including but not limited to the consummation of the Acquisition. The commitments provide for (i) a new $250 million senior secured revolving credit facility, (ii) a new $1.5 billion senior secured term loan facility, (iii) a $750 million senior secured bridge facility, and (iv) a $500 million senior unsecured bridge facility.

The Company has received equity commitments from existing and new sponsors of $470 million, an additional $180 million from the previously announced $290 million of equity commitments. The portion of the additional equity commitment will be used to fund the AboveNet Acquisition and to fund future working capital needs and/or investing activities, including expansion of the Company’s existing bandwidth infrastructure through organic or acquisition growth.

The Company will use the net proceeds of the debt and equity commitments, together with the net proceeds of expected private debt financing and cash on hand, to fund the purchase price of AboveNet and to repurchase and/or refinance certain of the Company’s and AboveNet’s existing indebtedness, as summarized by the following table:

Pro Forma Leverage Ratio

Subsequent to the close of the AboveNet acquisition, the Company anticipates pro forma leverage, defined as total indebtedness divided by last quarter annualized adjusted EBITDA, to be approximately 5.2x. The annualized adjusted EBITDA (unaudited) for the quarter ended March 31, 2012 was $215.8 million and $237.0 million for Zayo and AboveNet, respectively. In addition the Company expects to realize approximately $77.0 million of cost savings from the integration of the businesses which will be offset by certain purchase accounting adjustments that the Company estimates would have reduced the combined company’s annualized Adjusted EBITDA by approximately $3.1 million had the acquisition been consummated on January 1, 2012.

The calculation of pro forma leverage is as follows:

The Company defines Adjusted EBITDA as earnings before interest, income taxes, depreciation and amortization (“EBITDA”) adjusted to exclude transaction costs, stock-based compensation, and certain non-cash items. The Company uses Adjusted EBITDA to evaluate operating performance and liquidity, and these financial measures are among the primary measures used by management for planning and forecasting of future periods. The Company believes Adjusted EBITDA is especially important in a capital-intensive industry such as telecommunications. The Company further believes that the presentation Adjusted EBITDA is relevant and useful for investors because it allows investors to view results in a manner similar to the method used by management and makes it easier to compare the Company’s results with the results of other companies that have different financing and capital structures.

The Company also monitors Adjusted EBITDA as the Company’s debt covenants typically restrict the Company’s borrowing capacity based on a leverage ratio that utilizes Adjusted EBITDA.

EBITDA and Adjusted EBITDA have limitations as analytical tools, and should not be considered in isolation from, or as substitutes for, analysis of the Company’s results as reported under GAAP. For example, Adjusted EBITDA:

The Company’s computation of Adjusted EBITDA may not be comparable to other similarly titled measures computed by other companies, because all companies do not calculate Adjusted EBITDA in the same fashion. A reconciliation from earnings from continuing operations during the three months ended March 31, 2012 to annualized Adjusted EBITDA for Zayo and AboveNet is as follows:

The information contained under Item 7.01 of this filing on Form 8-K shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, and shall not be deemed incorporated by reference in any filing with the Securities and Exchange Commission under the Securities Exchange Act of 1934 or the Securities Act of 1933, whether made before or after the date hereof and irrespective of any general incorporation language in any filings.

Portions of this report may constitute “forward-looking statements” as defined by federal law. Although the Company believes any such statements are based on reasonable assumptions, there is no assurance that actual outcomes will not be materially different. Additional information about issues that could lead to material changes in the Company’s performance is contained in the Company’s filings with the Securities and Exchange Commission. The Company undertakes no obligation to publicly update or revise any forward-looking statements to reflect events or circumstances after the date hereof.

Item 9.01. Financial Statements and Exhibits.

SIGNATURE

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: June 4, 2012

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