UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D/A

Under the Securities Exchange Act of 1934

(Amendment No. 4)*

Synacor, Inc.

(Name of Issuer)

Common Stock, $0.01 par value

(Title of Class of Securities)

871561106

(CUSIP Number)

James E. Dawson, Esq., Nutter, McClennen & Fish LLP

155 Seaport Blvd, Boston, MA 02210

(Name, Address and Telephone Number of Person Authorized to Receive Notices and

Communications)

July 14, 2014

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition which is the subject of this Schedule 13D, and is filing this schedule because of §§240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box ¨.

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See §240.13d-7 for other parties to whom copies are to be sent.

*The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

This Amendment No. 4 amends and supplements, as set forth below, the information contained in Items 4 and 7 of the Schedule 13D that was originally filed with the Securities and Exchange Commission (the “SEC”) on June 17, 2014, as amended and supplemented by Amendment No. 1 filed with the SEC on June 26, 2014, Amendment No. 2 filed with the SEC on June 30, 2014, and Amendment No. 3 filed with the SEC on July 8, 2014 (collectively, the “Schedule 13D”). Except as amended by this Amendment No. 4, all information contained in the Schedule 13D is, after reasonable inquiry and to the best of the Reporting Persons’ knowledge and belief, true, complete and correct as of the date of this Amendment No. 4. Capitalized terms used herein and not otherwise defined have the meanings set forth in the Schedule 13D.

Item 4. Purpose of Transaction.

Item 4 is hereby amended to add the following:

On July 14, 2014, the Reporting Persons issued an open letter to the Board of Directors of the Issuer asking for Jordon Levy to resign and for three new directors to be added to the Board. A copy of the letter is filed as Exhibit 3 and is incorporated herein by reference.

Item 7. Material to be Filed as Exhibits.

Exhibit 3 Letter to the Board of Directors from the Reporting Persons, dated July 14, 2014.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete, and correct

Dated: July 14, 2014

Exhibit 3

Dear Board of Directors:

One month ago, we began publicly sharing our views about your mismanagement of Synacor and have since spoken with many other shareholders who share our concerns. Not a single shareholder has indicated they are pleased with your actions or are confident in the direction of Synacor under your leadership. You have also heard this from shareholders directly, so it is not news to you.

As a Board, you have refused to explain any strategy to turn Synacor around. The Company’s start page business is declining by every metric. We believe that will not change unless it’s combined with a larger, synergistic business and we would like the Board to explain its inaction. Synacor’s management has talked about pursuing the already crowded TV Everywhere and mobile markets where the Company has no meaningful current or historical presence. We’d like the Board to explain how and when those will be sizeable and profitable businesses. Finally, even if Synacor succeeds in capturing a significant share of the authentication market, we’d like the Board to address how this relatively small revenue opportunity will offset larger declines in the core business.

We have repeatedly demanded that the Board halt its CEO search and run a proper sale process to maximize shareholder value. We firmly believe there is inherent value in Syancor’s assets that can be unlocked in a strategic transaction. Further, we believe that there will be interest from multiple parties at prices far in excess of the current share price. Rather than pursuing a value-maximizing transaction, we believe that the Board is blindly pinning its hopes on a new CEO who has yet to be identified. Given the Board’s track record of failed leadership, we expect that the CEO selection you make will be another failure. Absent immediate changes, shareholders will pay for your continued failure through both the forgone opportunity for value maximization now and the $3 to $5 million in relocation expenses, change-of-control payments, and stock options and grants for a new CEO.

We believe that the heart of the problem with the current Board is its Chairman, Jordan Levy and we call for his immediate resignation. Since joining the Board 13 years ago in 2001, Mr. Levy’s failures include:

The list could go on and on and Synacor is not a unique failure for Mr. Levy. His participation on other boards has been no less disastrous.

Immediate Board change is needed. There is no possible justification for giving yourselves more time to work on your stated goal of “maximizing long-term value.” Many other shareholders feel the same.

If you doubt in any way that a significant majority of shareholders desire immediate change on the Board, we demand that the Board call a Special Meeting and allow shareholders to vote on whether the Board should seek and effect the immediate:

We look forward to the Board finally doing right by the Company’s shareholders and promptly calling a Special Meeting of shareholders for this purpose.

Sincerely,