SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20459

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 30)*

DONEGAL GROUP INC.

(Name of Issuer)

Class A Common Stock

Class B Common Stock

(Title of Class of Securities)

Class A: 257701201

Class B: 257701300

(CUSIP Number of Class of Securities)

Gregory M. Shepard

7028 Portmarnock Place

Bradenton, FL 34202

(309) 310-1331

(Name, address and telephone number of persons authorized to receive notices and communications on behalf of person(s) filing statement)

December 11, 2015

(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 that is the subject of this Schedule 13D, and is filing this Schedule because of Section 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 Rule 13d-7 for other parties to whom copies are to be sent.

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 (“Act”) 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).

SCHEDULE 13D

The Schedule 13D filed with the Securities and Exchange Commission on July 12, 2010 (the “Initial 13D”) by the Filing Person with respect to the Class A Shares and Class B Shares of Donegal Group Inc., a Delaware corporation (the “Issuer”), is hereby further amended to furnish the additional information set forth herein. All capitalized terms contained herein but not otherwise defined shall have the meanings ascribed to such terms in the Initial 13D.

On December 11, 2015, the Filing Person entered into an additional Promissory Note for up to $2,500,000, with Heartland Bank and Trust Company (attached as Exhibit 7.1) and an additional Commercial Pledge Agreement with Heartland Bank and Trust Company (attached as Exhibit 7.2) whereby the Filing Person pledged his Class A Shares and his Class B Shares to Heartland Bank and Trust Company. In total the Filing Person now has three Promissory Notes each for up to $2,500,000 with Heartland Bank and Trust Company.

SIGNATURE

After reasonable inquiry and to the best of his knowledge and belief, the undersigned certifies that the information set forth in this statement is true, complete and correct.

DATED: December 11, 2015

/s/ Gregory M. Shepard                

Gregory M. Shepard

EXHIBIT INDEX

Exhibit 7.1

PROMISSORY NOTE

References in the boxes above are for Lender’s use only and do not limit the applicability of this document to any particular loan or item.

Any item above containing “***” has been omitted due to text length limitations.

PROMISE TO PAY. Gregory M Shepard (“Borrower”) promises to pay to Heartland Bank and Trust Company (“Lender”), or order, in lawful money of the United States of America, the principal amount of Two Million Five Hundred Thousand & 00/100 Dollars ($2,500,000.00), together with interest on the unpaid principal balance from December 11, 2015, until paid in full.

PAYMENT. Borrower will pay this loan in one principal payment of $2,500,000.00 plus interest on February 26, 2016. This payment due on February 26, 2016, will be for all principal and all accrued interest not yet paid. Unless otherwise agreed or required by applicable law, payments will be applied first to any accrued unpaid interest; then to principal; and then to any unpaid collection costs. Borrower will pay Lender at Lender’s address shown above or at such other place as Lender may designate in writing.

VARIABLE INTEREST RATE. The interest rate on this Note is subject to change from time to time based on changes in an independent index which is the highest Prime Rate as reported by the Wall Street Journal (the “Index”). The Index is not necessarily the lowest rate charged by Lender on its loans. If the Index becomes unavailable during the term of this loan, Lender may designate a substitute index after notifying Borrower. Lender will tell Borrower the current Index rate upon Borrower’s request. The interest rate change will not occur more often than each day. Borrower understands that Lender may make loans based on other rates as well. Interest on the unpaid principal balance of this Note will be calculated as described in the “INTEREST CALCULATION METHOD” paragraph using a rate of 0.500 percentage points over the Index. NOTICE: Under no circumstances will the interest rate on this Note be more than the maximum rate allowed by applicable law.

INTEREST CALCULATION METHOD. Interest on this Note is computed on a 365/360 basis; that is, by applying the ratio of the interest rate over a year of 360 days, multiplied by the outstanding principal balance, multiplied by the actual number of days the principal balance is outstanding. All interest payable under this Note is computed using this method.

PREPAYMENT; MINIMUM INTEREST CHARGE. In any event, even upon full prepayment of this Note, Borrower understands that Lender is entitled to a minimum interest charge of $75.00. Other than Borrower’s obligation to pay any minimum interest charge, Borrower may pay without penalty all or a portion of the amount owed earlier than it is due. Early payments will not, unless agreed to by Lender in writing, relieve Borrower of Borrower’s obligation to continue to make payments under the payment schedule. Rather, early payments will reduce the principal balance due. Borrower agrees not to send Lender payments marked “paid in full”, “without recourse”, or similar language. If Borrower sends such a payment, Lender may accept it without losing any of Lender’s rights under this Note, and Borrower will remain obligated to pay any further amount owed to Lender. All written communications concerning disputed amounts, including any check or other payment instrument that indicates that the payment constitutes “payment in full” of the amount owed or that is tendered with other conditions or limitations or as full satisfaction of a disputed amount must be mailed or delivered to: Heartland Bank and Trust Company, 100 - Hershey Road, 401 N Hershey Rd, P.O. Box 67, Bloomington, IL 61702.

INTEREST AFTER DEFAULT. Upon default, including failure to pay upon final maturity, the interest rate on this Note shall be increased by adding an additional 5.000 percentage point margin (“Default Rate Margin”). The Default Rate Margin shall also apply to each succeeding interest rate change that would have applied had there been no default. However, in no event will the interest rate exceed the maximum interest rate limitations under applicable law.

DEFAULT. Each of the following shall constitute an event of default (“Event of Default”) under this Note:

Payment Default. Borrower fails to make any payment when due under this Note.

Other Defaults. Borrower fails to comply with or to perform any other term, obligation, covenant or condition contained in this Note or in any of the related documents or to comply with or to perform any term, obligation, covenant or condition contained in any other agreement between Lender and Borrower.

Default in Favor of Third Parties. Borrower or any Grantor defaults under any loan, extension of credit, security agreement, purchase or sales agreement, or any other agreement, in favor of any other creditor or person that may materially affect any of Borrower’s property or Borrower’s ability to repay this Note or perform Borrower’s obligations under this Note or any of the related documents.

False Statements. Any warranty, representation or statement made or furnished to Lender by Borrower or on Borrower’s behalf under this Note or the related documents is false or misleading in any material respect, either now or at the time made or furnished or becomes false or misleading at any time thereafter.

Death or Insolvency. The death of Borrower or the dissolution or termination of Borrower’s existence as a going business, the insolvency of Borrower, the appointment of a receiver for any part of Borrower’s property, any assignment for the benefit of creditors, any type of creditor workout, or the commencement of any proceeding under any bankruptcy or insolvency laws by or against Borrower.

Creditor or Forfeiture Proceedings. Commencement of foreclosure or forfeiture proceedings, whether by judicial proceeding, self-help, repossession or any other method, by any creditor of Borrower or by any governmental agency against any collateral securing the loan. This includes a garnishment of any of Borrower’s accounts, including deposit accounts, with Lender. However, this Event of Default shall not apply if there is a good faith dispute by Borrower as to the validity or reasonableness of the claim which is the basis of the creditor or forfeiture proceeding and if Borrower gives Lender written notice of the creditor or forfeiture proceeding and deposits with Lender monies or a surety bond for the creditor or forfeiture proceeding, in an amount determined by Lender, in its sole discretion, as being an adequate reserve or bond for the dispute.

Events Affecting Guarantor. Any of the preceding events occurs with respect to any guarantor, endorser, surety, or accommodation party of any of the indebtedness or any guarantor, endorser, surety, or accommodation party dies or becomes incompetent, or revokes or disputes the validity of, or liability under, any guaranty of the indebtedness evidenced by this Note.

Adverse Change. A material adverse change occurs in Borrower’s financial condition, or Lender believes the prospect of payment or performance of this Note is impaired.

LENDER’S RIGHTS. Upon default, Lender may declare the entire unpaid principal balance under this Note and all accrued unpaid interest immediately due, and then Borrower will pay that amount.

ATTORNEYS’ FEES; EXPENSES. Lender may hire or pay someone else to help collect this Note if Borrower does not pay. Borrower will pay Lender that amount. This includes, subject to any limits under applicable law, Lender’s attorneys’ fees and Lender’s legal expenses, whether or not there is a lawsuit, including attorneys’ fees, expenses for bankruptcy proceedings (including efforts to modify or vacate any automatic stay or injunction), and appeals. If not prohibited by applicable law, Borrower also will pay any court costs, in addition to all other sums provided by law.

JURY WAIVER. Lender and Borrower hereby waive the right to any jury trial in any action, proceeding, or counterclaim brought by either Lender or Borrower against the other.

GOVERNING LAW. This Note will be governed by federal law applicable to Lender and, to the extent not preempted by federal law, the laws of the State of Illinois without regard to its conflicts of law provisions. This Note has been accepted by Lender in the State of Illinois.

CHOICE OF VENUE. If there is a lawsuit, Borrower agrees upon Lender’s request to submit to the jurisdiction of the courts of McLean County, State of Illinois.

DISHONORED ITEM FEE. Borrower will pay a fee to Lender of $30.00 if Borrower makes a payment on Borrower’s loan and the check or preauthorized charge with which Borrower pays is later dishonored.

RIGHT OF SETOFF. To the extent permitted by applicable law, Lender reserves a right of setoff in all Borrower’s accounts with Lender (whether checking, savings, or some other account). This includes all accounts Borrower holds jointly with someone else and all accounts Borrower may open in the future. However, this does not include any IRA or Keogh accounts, or any trust accounts for which setoff would be prohibited by law. Borrower authorizes Lender, to the extent permitted by applicable law, to charge or setoff all sums owing on the indebtedness against any and all such accounts, and, at Lender’s option, to administratively freeze all such accounts to allow Lender to protect Lender’s charge and setoff rights provided in this paragraph.

COLLATERAL. Borrower acknowledges this Note is secured by collateral described in a Commercial Pledge Agreement and a Pledged Collateral Account Control Agreement dated August 26, 2015.

SECURITY PROVISION. This Note may be secured by prior or subsequent security documents notwithstanding that such security is not indicated hereon in the paragraph entitled “Collateral”.

SECURITY INTEREST IN DEPOSIT ACCOUNTS. Borrower grants to Lender a contractual security interest in, and hereby assigns, conveys, delivers, pledges, and transfers to Lender all Borrower’s right, title and interest in and to, Borrower’s deposit accounts with Lender (whether checking, savings, or some other account), including without limitation all deposit accounts held jointly with someone else and all deposit accounts Borrower may open in the future, excluding however all IRA and Keogh accounts, and all trust accounts for which the grant of a security interest would be prohibited by law. Borrower authorizes Lender, to the extent permitted by applicable law, to charge or setoff all sums owing on this Note against any and all such deposit accounts.

CONFESSION OF JUDGMENT. Borrower hereby irrevocably authorizes and empowers any attorney-at-law to appear in any court of record and to confess judgment against Borrower for the unpaid amount of this Note as evidenced by an affidavit signed by an officer of Lending setting forth the amount then due, attorneys’ fees plus costs of suit, and to release all errors, and waive all rights of appeal. If a copy of this Note, verified by an affidavit, shall have been filed in the proceeding, it will not be necessary to file the original as a warrant of attorney. Borrower waives the right to any stay of execution and the benefit of all exemption laws nor or hereafter in effect. No single exercise of the foregoing warrant and power to confess judgment will be deemed to exhaust the power, whether or not any such exercise shall be held by any court to be invalid, voidable, or void; but the power will continue undiminished and may be exercised from time to time as Lender may elect until all amounts owing on this Note have been paid in full. Borrower hereby waives and releases any and all claims or causes of action which Borrower might have against any attorney acting under the terms of authority which Borrower has granted herein arising out of or connected with the confession of judgment hereunder.

SUCCESSOR INTERESTS. The terms of this Note shall be binding upon Borrower, and upon Borrower’s heirs, personal representatives, successors and assigns, and shall inure to the benefit of Lender and its successors and assigns.

GENERAL PROVISIONS. If any part of this Note cannot be enforced, this fact will not affect the rest of the Note. Lender may delay or forgo enforcing any of its rights or remedies under this Note without losing them. Borrower and any other person who signs, guarantees or endorses this Note, to the extent allowed by law, waive presentment, demand for payment, and notice of dishonor. Upon any change in the terms of this Note, and unless otherwise expressly stated in writing, no party who signs this Note, whether as maker, guarantor, accommodation maker or endorser, shall be released from liability. All such parties agree that Lender may renew or extend (repeatedly and for any length of time) this loan or release any party or guarantor or collateral; or impair, fail to realize upon or perfect Lender’s security interest in the collateral; and take any other action deemed necessary by Lender without the consent of or notice to anyone. All such parties also agree that Lender may modify this loan without the consent of or notice to anyone other than the party with whom the modification is made. The obligations under this Note are joint and several.

PRIOR TO SIGNING THIS NOTE, BORROWER READ AND UNDERSTOOD ALL THE PROVISIONS OF THIS NOTE, INCLUDING THE VARIABLE INTEREST RATE PROVISIONS. BORROWER AGREES TO THE TERMS OF THE NOTE.

BORROWER ACKNOWLEDGES RECEIPT OF A COMPLETED COPY OF THIS PROMISSORY NOTE.

LaserPro, Ver. 15.5.0.024 Copr. D+H USA Corporation 1997, 2015. All Rights Reserved. - IL C:\CFI\LPL\D20.FC TR-63921 PR-63 (M)

Exhibit 7.2

DISBURSEMENT REQUEST AND AUTHORIZATION

References in the boxes above are for Lender’s use only and do not limit the applicability of this document to any particular loan or item.

Any item above containing “***” has been omitted due to text length limitations.

LOAN TYPE. This is a Variable Rate Nondisclosable Loan to an Individual for $2,500,000.00 due on February 26, 2016.

PRIMARY PURPOSE OF LOAN. The primary purpose of this loan is for:

SPECIFIC PURPOSE. The specific purpose of this loan is: Business Use.

DISBURSEMENT INSTRUCTIONS. Borrower understands that no loan proceeds will be disbursed until all of Lender’s conditions for making the loan have been satisfied. Please disburse the loan proceeds of $2,500,000.00 as follows:

ERRORS AND OMISSIONS. The undersigned borrower(s) for and in consideration of Heartland Bank and Trust Company the Lender, funding the closing of this loan agrees, if requested by Lender, to fully cooperate and adjust for clerical errors, any or all loan closing documentation if deemed necessary or desirable in the reasonable discretion of Lender to enable Lender to sell, convey, seek guaranty or market said loan to any entity, including but not limited to an investor, Federal National Mortgage Association, Federal Home Loan Mortgage Corporation, Government National Mortgage Association, Federal Housing Authority or the Department of Veterans Affairs, or any Municipal Bonding Authority.

The undersigned borrower(s) agrees(s) to comply with all above noted requests by the Lender within 30 days from date of mailing said requests. Borrower(s) agree(s) to assume all costs including, by way of illustration and not limitation, actual expenses, legal fees and marketing losses for failing to comply with correction requests in the above noted time period.

The undersigned borrower(s) do hereby so agree and covenant in order to assure that this loan documentation executed this date will conform and be acceptable in the marketplace in the instance of transfer, sale or conveyance by Lender of its interest in and to said loan documentation, and to assure marketable title in the said borrower(s).

FINANCIAL CONDITION. BY SIGNING THIS AUTHORIZATION, BORROWER REPRESENTS AND WARRANTS TO LENDER THAT THE INFORMATION PROVIDED ABOVE IS TRUE AND CORRECT AND THAT THERE HAS BEEN NO MATERIAL ADVERSE CHANGE IN BORROWER’S FINANCIAL CONDITION AS DISCLOSED IN BORROWER’S MOST RECENT FINANCIAL STATEMENT TO LENDER. THIS AUTHORIZATION IS DATED DECEMBER 11, 2015.

LaserPro, Ver. 15.5.0.024 Copr. D+H USA Corporation 1997, 2015. All Rights Reserved. - IL C:\CFI\LPL\I20.FC TR-63921 PR-63 (M)