UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 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): April 24, 2015

ENTROPIC COMMUNICATIONS, INC.

(Exact Name of Registrant as Specified in Its Charter)

6350 Sequence Drive

San Diego, CA 92121

(Address of Principal Executive Offices and Zip Code)

(858) 768-3600

(Registrant’s Telephone Number, Including Area Code)

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):

This Current Report on Form 8-K is filed in connection with the Agreement and Plan of Merger and Reorganization, dated as of February 3, 2015 (the “Merger Agreement”), by and among MaxLinear, Inc. (“MaxLinear”), Entropic Communications, Inc. (“Entropic”), Excalibur Acquisition Corporation (“Excalibur”), and Excalibur Subsidiary, LLC.

Memorandum of Understanding and Supplemental Disclosures

As previously disclosed in the registration statement on Form S-4 of MaxLinear, that was declared effective on March 30, 2015 (the “registration statement”), and the definitive joint proxy statement/prospectus that MaxLinear and Entropic filed with the Securities and Exchange Commission on March 30, 2015 (the “joint proxy statement/prospectus”), Entropic, the board of directors of Entropic, MaxLinear, Excalibur, and Excalibur Subsidiary, LLC have been named as defendants in putative class action lawsuits brought in the Delaware Court of Chancery (the “Court”) by stockholders of the Company challenging the proposed merger with MaxLinear (the “Delaware Actions”). The complaints generally allege that, in connection with the proposed acquisition of Entropic by MaxLinear, the individual defendants breached their fiduciary duties to Entropic stockholders by, among other things, purportedly failing to take steps to maximize the value of Entropic to its stockholders and agreeing to allegedly preclusive deal protection devices in the merger agreement. The complaints further allege that Entropic, MaxLinear, and/or the merger subsidiaries aided and abetted the individual defendants in the alleged breaches of their fiduciary duties.

MaxLinear and Entropic believe that no further disclosure is required to supplement the joint proxy statement/prospectus under applicable laws; however, to eliminate the burden, expense and uncertainties inherent in such litigation, on April 24, 2015, the defendants entered into a memorandum of understanding (the “Memorandum of Understanding”) regarding the settlement of the Delaware Actions. The Memorandum of Understanding outlines the terms of the parties’ agreement in principle to settle and release all claims which were or could have been asserted in the Delaware Actions. In consideration for such settlement and release, the parties to the Delaware Actions have agreed, among other things, that Entropic will make certain supplemental disclosures to the joint proxy statement/prospectus, all of which are set forth below. The Memorandum of Understanding contemplates that the parties will negotiate in good faith to agree upon a stipulation of settlement to be submitted to the Court for approval as soon as practicable. The stipulation of settlement will be subject to customary conditions, including approval by the Court, which will consider the fairness, reasonableness and adequacy of such settlement. There can be no assurance that the parties will ultimately enter into a stipulation of settlement or that the Court will approve the settlement even if the parties were to enter into such stipulation. In such event, or if the transactions contemplated by the Merger Agreement are not consummated for any reason, the proposed settlement will be of no force and effect.

SUPPLEMENT TO JOINT PROXY STATEMENT/PROSPECTUS

In connection with settlement of the Delaware Action, Entropic has agreed to make these supplemental disclosures to the Joint Proxy Statement/Prospectus. This supplemental information should be read in conjunction with the Joint Proxy Statement/Prospectus, which should be read in its entirety. Defined terms used but not defined below have the meanings set forth in the Joint Proxy Statement/Prospectus.

“On March 30, 2015, the Mouw complaint was voluntarily dismissed, and on April 22, 2015, the Badolato complaint was voluntarily dismissed.”

“Additionally, as part of the review of potential strategic alternatives for Entropic, representatives of Barclays made a presentation to the board of directors of Entropic regarding the possible adoption of a stockholder rights plan, including an explanation of how such a plan would function, the rational for such a plan, and the potential pros and cons for putting in place such a plan. Following the presentation, the Board did not consider adopting a stockholder rights plan.”

“The operating expenses included in EBITDA and EBIT exclude share-based compensation expense (which is estimated to be $21.9, $24.2, and $20.7 million for 2015-2017), amortization of purchased intangibles, and other one-time expenses that would be included in operating expenses under GAAP.”

“Small Cap Companies

Set-Top Box / Home Companies

“In connection with the discounted cash flow analysis, Barclays did not make any adjustments to Entropic’s beta due to Entropic’s cash balance.”

“• Illustrative Pro Forma Accretion / Dilution Analysis

Barclays performed an illustrative pro forma analysis of the potential financial impact of the merger on MaxLinear’s estimated earnings per share for calendar years 2015 and 2016, both before and after giving effect to potential synergies that may result from the merger. Estimated financial data of Entropic and MaxLinear were based on projections provided by the respective managements of Entropic and MaxLinear and respective company filings of Entropic and MaxLinear. The management projections of Entropic are set forth in the section captioned “Certain Unaudited Prospective Financial Information Reviewed by Entropic’s Board of Directors and Entropic’s Financial Advisor” of this joint proxy statement/prospectus and the management projections of MaxLinear are set forth in the section captioned “Certain Unaudited Prospective Financial Information Reviewed by MaxLinear’s Board of Directors and MaxLinear’s Financial Advisor” of this joint proxy statement/prospectus. The actual results achieved by the combined company may vary from projected results, and the variations may be material. Based on the exchange ratio of 0.2200 of a share of MaxLinear Class A common stock per share of Entropic common stock, this analysis indicated the following accretion (dilution) to MaxLinear’s estimated earnings per share:

“The above referenced financial projections with respect to Entropic were prepared by Entropic’s management in January 2015 (taking into account Entropic’s fourth quarter results from the prior year and management’s best estimates as of such time) and provided to Entropic’s financial advisor on January 28, 2015 and the above referenced financial projections with respect to MaxLinear were provided to Entropic’s financial advisor on January 29, 2015.”

“In preparing the financial projections, Entropic’s management took into account the assumed use of Entropic’s net operating loss carryforwards and tax credit carryforwards to reduce Entropic’s tax obligations.”

“The operating expenses included in EBITDA and EBIT exclude share-based compensation expense (which is estimated to be $11.5, $12.0, $9.8, $8.7, and $5.6 million for 2015-2019), amortization of purchased intangibles, and other one-time expenses that would be included in operating expenses under GAAP.”

“The following table and the related footnotes set forth, for each named executive officer of Entropic whose employment is expected to be terminated following the closing of the merger, the number of shares of Entropic common stock underlying such officer’s options, restricted stock units and performance stock units that were unvested as of January 31, 2015 for which (i) vesting will occur prior to the closing of the merger pursuant to the terms of such award or (ii) vesting will accelerate effective as of the termination of such officer’s employment in connection with the merger pursuant to the terms of the merger agreement and such officer’s amended and restated change of control agreement (assuming the termination without cause of such officer’s employment shortly following the closing of the merger):

“The following table and the related footnotes present information about the consideration payable to each non-employee member of Entropic’s board of directors in respect of such director’s outstanding stock options and restricted stock units, as applicable, in connection with the merger (assuming (i) full acceleration of vesting, (ii) that each such director exercises all in-the money stock options prior to the closing of the merger and (iii) that each such director receives the merger consideration payable for his shares of Entropic common stock at the closing of the merger (net of the exercise price per share)):

Forward Looking Statements

This report contains forward-looking statements within the meaning of the “safe harbor” provisions of the Private Securities Litigation Reform Act of 1995, including with respect to the anticipated timing, completion and effects of the proposed merger between MaxLinear and Entropic. These statements are based on current expectations and beliefs of the management of MaxLinear and Entropic, and are subject to a number of factors and uncertainties that could cause actual results to differ materially from those described in the forward-looking statements. These forward-looking statements include statements regarding the expected timetable for completing the merger, benefits and synergies of the merger, future financial performance, future opportunities for MaxLinear following completion of the merger, and other statements regarding the proposed transaction. Forward-looking statements may contain words such as “will be,” “will,” “expect,” “anticipate,” “continue,” “project,” “believe,” “plan,” “could,” “estimate,” “forecast,” “guidance,” “intend,” “may,” “plan,” “possible,” “potential,” “predict,” “pursue,” “should,” “target” or similar expressions, and include the assumptions that underlie such statements. The following factors, among others, could cause actual results to differ materially from those described in the forward-looking statements:

The foregoing review of important factors should not be construed as exhaustive and should be read in conjunction with the other cautionary statements that are included herein and elsewhere, including the risk factors set forth in the joint proxy statement/prospectus that MaxLinear and Entropic filed with the Securities and Exchange Commission on March 30, 2015 and the risk factors included in MaxLinear’s and Entropic’s annual reports on Form 10-K for the year ending December 31, 2014 and other documents of MaxLinear and Entropic on file with the Securities and Exchange Commission and incorporated by reference herein. Any forward-looking statements made in this report are qualified in their entirety by the cautionary statements contained or referred to in this section, and there is no assurance that the actual results or anticipated developments will be realized or that, even if substantially realized, they will have the expected consequences to, or effects on, businesses or operations. All subsequent written and oral forward-looking statements concerning MaxLinear, Entropic, the transactions contemplated by the merger agreement or other matters attributable to MaxLinear or Entropic or any person acting on their behalf are expressly qualified in their entirety by the cautionary statements above. Except to the extent required by applicable law, MaxLinear and Entropic are under no obligation (and expressly disclaim any such obligation) to update or revise their forward-looking statements whether as a result of new information, future events, or otherwise.

Additional Information and Where to Find It

This report may be deemed to be solicitation material in respect of the proposed transaction involving MaxLinear and Entropic. In connection with the proposed transaction, MaxLinear filed with the SEC a registration statement on Form S-4 that includes a definitive joint proxy statement/prospectus of MaxLinear and Entropic, which MaxLinear filed with the SEC on March 30, 2015. The registration statement was declared effective by the SEC on March 30, 2015. MaxLinear and Entropic mailed the definitive joint proxy statement/prospectus to the respective stockholders in connection with the proposed transaction on or about April 1, 2015. INVESTORS AND STOCKHOLDERS ARE URGED TO READ THE JOINT PROXY STATEMENT/PROSPECTUS AND OTHER RELEVANT DOCUMENTS FILED OR TO BE FILED WITH THE SEC CAREFULLY AND IN THEIR ENTIRETY WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT MAXLINEAR, ENTROPIC, THE PROPOSED TRANSACTION AND RELATED MATTERS. Investors and stockholders are able to obtain free copies of the joint proxy statement/prospectus and other documents filed with the SEC by MaxLinear and Entropic through the website maintained by the SEC at www.sec.gov. In addition, investors and stockholders are able to obtain free copies of the definitive joint proxy statement/prospectus and other documents filed by Entropic with the SEC by contacting Investor Relations, at ir@entropic.com or by calling (858) 768-3852.

Entropic and its directors and executive officers and other persons may be deemed to be participants in the solicitation of proxies from Entropic’s stockholders in respect of the proposed transaction that is described in the definitive joint proxy statement/prospectus. Information regarding the persons who may, under the rules of the SEC, be deemed participants in the solicitation of proxies from Entropic’s stockholders in connection with the proposed transaction, including a description of their direct or indirect interests, by security holdings or otherwise, in Entropic is set forth in Entropic’s Annual Report on Form 10-K for the year ended December 31, 2014 which is filed with the SEC. Additional information regarding the interests of Entropic’s directors and executive officers in the proposed transaction, which may be different than those of Entropic’s stockholders generally, is contained in the definitive joint proxy statement/prospectus that MaxLinear filed with the SEC on March 30, 2015.

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 hereto duly authorized.