As filed the Securities and Exchange Commission on August 6, 1997. Registration No. 333-31049 SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 AMENDMENT NO. 2 TO FORM S-3 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 OLD SECOND BANCORP, INC. (Exact name of registrant as specified in its charter) Delaware 36-3143493 (State or other jurisdiction of incorporation (I.R.S. employer or organization) identifiecation no.) 37 South River Street Aurora, Illinois 60507 (630) 892-0202 (Address, including zip code, and telephone number, including area code, of registrant's principal executive offices) Ronald J. Carlson 37 South River Street Aurora, Illinois 60507 (Name, address, including zip code, and telephone number, including area code, of agent for service) Copies of Communications to: Eric F. Fess, Esq. Chapman and Cutler 111 West Monroe Chicago, Illinois 60603 Approximate date of commencement of proposed sale to public:From time to time after the Registration Statement becomes effective at the discretion of the Selling Stockholders. If the only securities being registered on this Form are being offered pursuant to dividend or interest reinvestment plans, please check the following box. [ ] If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule_415 under the Securities Act of 1933, other than securities offered only in connection with dividend or interest reinvestment plans, please check the following box. [ x ] If this Form is filed to register additional securities for an offering pursuant to Rule_462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement foil the same offering. [ ] If this Form is a post-effective amendment filed pursuant to Rule_462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. [ ] If delivery of the prospectus is expected to be made pursuant to Rule_434, please check the following box. [ ] The registrant hereby amends this registration statement son such date or dates as may be necessary to delay its effective date until the registrant shall file a further amendment which specifically states that this registration statement shall thereafter become effective in accordance with Section 8(A) of the Securities Act of 1933 or until this registration statement shall become effective on such date as the Securities and Exchange Commission, acting pursuant to said Section 8(A), may determine. Subject to Completion, Dated August 6, 1997. 111,706 Shares Old Second Bancorp, Inc. Common Stock This Prospectus relates to 111,706 Shares (the "Shares") of Common Stock, without par value, (the "Common Stock") of Old Second Bancorp, Inc., a Delaware corporation ("Old Second") which are being sold by certain stockholders of the Company (the "Selling Stockholders"). Old Second will not receive any of the proceeds from the sale of the Shares offered hereby. See "Selling Stockholders." The Common Stock is traded on the Nasdaq National Market System under the symbol OSBC. On August 1, 1997, the closing price of the Common Stock on the Nasdaq National Market System was $47.25. These Securities have not been approved or disapproved by the Securities and Exchange Commission or any state securities commission, nor has the Securities and Exchange Commission or any state securities commission passed upon the accuracy or adequacy of this Prospectus. Any representation To the contrary is A criminal offense. The Selling Stockholders, or any of them, may sell the Shares from time to time in transactions on the Nasdaq National Market System or in the over-the-counter market, or through private sales. All sales made on the Nasdaq National Market System or in the over- the-counter market shall be made at the then prevailing price of the Shares on such national market system or in such over-the- counter market, as applicable; any private sales will be made at negotiated prices. Sales of the Shares may be made to or through broker-dealers, and such broker-dealers may receive compensation in the form of discounts, concessions or commissions from the Selling Stockholders effecting such sales. The Selling Stockholders and any broker-dealers who act in connection with sales of Shares may be deemed to be "underwriters" as that term is defined in the Securities Act of 1933, as amended (the "Securities Act"), and any commissions received by them and profit on any resale of the Shares may be deemed to be underwriting discounts and commissions under the Securities Act. Old Second has agreed to indemnify the Selling Stockholders and underwriters of the Selling Stockholders against certain liabilities, including certain liabilities under the Securities Act, in connection with the registration and the offering and sale of the Shares offered hereby. See "Manner of Offering." The date of this Prospectus is August 1997. No person has been authorized to give any information or to make any representation other than those contained in this Prospectus, and, if given or made, such other information or representation must not be relied upon as having been authorized. This Prospectus does not constitute an offer to sell, or a solicitation of an offer to buy, the Shares in any jurisdiction where, or to any person to whom, it is unlawful to make such offer or solicitation. Neither the delivery of this Prospectus nor any sale made hereunder shall, under any circumstances, create an implication that there has been no change in the affairs of Old Second since the date hereof or that the information contained herein or therein is correct as of any time subsequent to the date of such information. Available Information Old Second is subject to the informational requirements of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), and in accordance therewith files reports, proxy statements and other information with the Securities and Exchange Commission (the "Commission"). Such reports, proxy and information statements and other information, including the documents incorporated by reference herein, can be inspected and copied at the public reference facilities maintained by the Commission at 450 Fifth Street, N.W., Washington, D.C. 20549; and at the Commission's regional offices at Seven World Trade Center, 13th Floor, New York, New York 10048 and Suite 1400, 500 West Madison Street, Chicago, Illinois 60661. Copies of such material can be obtained from the Public Reference Section of the Commission, 450 Fifth Street, N.W., Washington, D.C. 20549 at prescribed rates. The Commission maintains a Website at http:\\www.sec.gov that contains reports, proxy statements and other information filed by Old Second. Old Second has filed a registration statement on Form_S-3 (herein, together with all amendments and exhibits, referred to as the "Registration Statement") under the Securities Act, with respect to the Common Stock being offered pursuant to this Prospectus. This Prospectus does not contain all of the information set forth in the Registration Statement, certain parts of which are omitted in accordance with the rules and regulations of the Commission. The Registration Statement may be inspected and copied at the public reference facilities maintained by the Commission at the addresses set forth in the preceding paragraph. Statements contained herein concerning the provisions of any documents are not necessarily complete and, in each instance, reference is made to the copy of such document filed as an exhibit to the Registration Statement or otherwise filed with the Commission. Each such statement is qualified in its entirety by such reference. Incorporation of Certain Information by Reference The following documents, which have been filed by Old Second with the Commission, are hereby incorporated by reference: Page 2 1. Old Second's Annual Report on Form_10-K for the year ended December 31, 1996 (which incorporates by reference certain information from Old Second's Proxy Statement relating to the 1996 Annual Meeting of Stockholders). 2. Old Second's Quarterly Report on Form_10-Q for the quarter ended March_3l, 1997. 3. Old Second's Current Report on Form_8-K dated May 20, 1997. 4. Old Second's Current Report on Form_8-K dated August 1, 1997. 5. The description of Common Stock contained in Old Second's registration statement filed pursuant to the Exchange Act, and any amendment or report filed for the purpose of updating such description. All documents filed by Old Second pursuant to Sections_13(a), 13(c), 14 or 15(d) of the Exchange Act after the date of this Prospectus and prior to the termination of this offering shall be deemed to be incorporated herein by reference. Any statement contained herein or in a document incorporated or deemed to be incorporated by reference herein shall be deemed to be modified or superseded for purposes of this Prospectus and the Registration Statement of which it is a part to the extent that a statement contained herein or in a subsequently filed document which also is incorporated or deemed to be incorporated by reference herein modifies or supersedes such statement. Any statement so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this Prospectus or such Registration Statement. Old Second will provide without charge to each person to whom a copy of this Prospectus has been delivered, upon written or oral request of such person, a copy of any or all of the documents which have been or may be incorporated herein by reference, other than exhibits to such documents (unless such exhibits are specifically incorporated by reference into such documents). Requests for such copies should be directed to Ronald_J. Carlson, President, Old Second Bancorp, Inc., 37_South River Street, Aurora, Illinois 60507, telephone number (630)_892-0202. Old Second Bancorp, Inc. Old Second, a Delaware corporation, is a multibank holding company registered under the BHCA and based in Aurora, Illinois. Old Second owns 100% of the capital stock of The Old Second National Bank of Aurora, Yorkville National Bank, The Old Second Community Bank of North Aurora, The Old Second Community Bank of Aurora, Burlington Bank, Kane County Bank and Trust Company and Bank of Sugar Grove (the "Old Second Subsidiary Banks"). In May 1997, Old Second completed the acquisition of Maple Park Bancshares, Inc. which owned 100% of the capital stock of the First State Bank of Maple Park. In June 1997, First State Bank of Maple Park merged with The Old Second National Bank of Aurora. Page 3 The Old Second National Bank of Aurora (the "Old Second National Bank"), located at 37_South River Street, Aurora, Illinois, offers complete banking and trust services for retail, commercial, industrial, and public entity customers in Aurora, Illinois and the surrounding area. Services include loans to all customer segments, checking, savings and time deposits; lock box service and safe deposit boxes; trust and other fiduciary services to commercial customers and individuals; and other customer services. Old Second National Bank has two offsite automatic teller machines, and its customers can use certain other financial institutions' offsite teller machines to complete deposit, withdrawal, transfers, and other banking transactions. The Old Second Community Bank of North Aurora is located at 200_West John Street in the Village of North Aurora. The Old Second Community Bank of Aurora is located at 1350 North Farnsworth Avenue, Aurora, Illinois. Yorkville National Bank is located at 102_East Van Emmon Street, Yorkville, Illinois. Burlington Bank is located at 194_South Main Street, Burlington, Illinois. Kane County Bank and Trust Company is located at 122_North Main Street, Elburn, Illinois. Bank of Sugar Grove is located on Cross Street at Route_47, Sugar Grove, Illinois. These banks offer banking services for retail, commercial, industrial, and public entity customers in the Aurora, North Aurora, Yorkville, Burlington, Elburn, Wasco, Plano, Oswego, Ottawa and Maple Park communities and surrounding areas. Services include loans to all customer segments, checking, savings and time deposits, and other customer services. With the exception of Yorkville's main banking facility, these banks have onsite 24-hour automatic teller machines, and their customers can use certain other financial institutions' offsite teller machines to complete deposit, withdrawal, transfers, and other banking transactions. Customers can enjoy "Valley-Wide Banking" at all Old Second Subsidiary Bank locations. A customer of an Old Second Subsidiary Bank can transact most business, including checking, savings and personal loan transactions, at any other Old Second Subsidiary Bank. Recent Developments In connection with the acquisition of Maple Park Bancshares, Inc. by Old Second in May 1997, Old Second agreed, pursuant to a Registration Rights Agreement dated May_13, 1997 (the "Registration Rights Agreement"), to register all shares of Common Stock issued to the former Maple Park Bancshares, Inc. stockholders in exchange for their shares of Maple Park Bancshares, Inc. These stockholders are identified herein under "Selling Stockholders." Proceeds of the Offering Old Second will not receive any proceeds from the sale of Common Stock offered hereby. Page 4 Price Range of Common Stock and Dividend Policy Old Second Common Stock currently trades on the Nasdaq National Market System under the symbol "OSBC." The following table sets forth the range of closing prices and dividend information during the periods indicated for 1997, 1996 and 1995. 1997 High Low Dividends Declared First Quarter $48.50 $46.75 $.20 Second Quarter 48.50 47.50 $.20 Third Quarter (through August_1, 1997) 48.75 46.75 --- 1996 High Low Dividends Declared First Quarter $37.60 $36.00 $.16 Second Quarter 39.00 38.50 .20 Third Quarter 40.00 38.75 .20 Fourth Quarter 41.50 39.25 .30 1995 High Low Dividends Declared First Quarter $34.00 $27.20 $.14 Second Quarter 36.00 28.80 .14 Third Quarter 37.00 29.60 .16 Fourth Quarter 41.00 32.80 .28 The last reported closing price of Old Second Common Stock on August 1, 1997, was $47.25. Old Second presently expects that it will continue to pay dividends on the Common Stock in the future at such times and in such amounts as Old Second's Board of Directors, in its discretion, may determine. For additional information regarding payment of dividends, see "Description of Capital Stock Dividend Rights." Selling Stockholders All of the shares of Common Stock being offered hereby are being sold by the Selling Stockholders. Each of the Selling Stockholders acquired their shares of Common Stock in connection with the acquisition by Old Second of Maple Park Bancshares, Inc., consummated in May 1997. After completion of the offering contemplated hereby, none of the Selling Stockholders will beneficially own more than 1% of the Common Stock. Page 5 The following table sets forth the name of each Selling Stockholder and certain information regarding the beneficial ownership of Common Stock as of August 1, 1997 and as adjusted to reflect the sale of the Shares by the Selling Stockholders. Shares Shares Shares Name of Owned Prior to Offered Owned after Selling Stockholder the Offering Hereby the Offering Joe A. Pruess 42,252 42,252 0 Bruce Madden (1) 30,222 30,222 0 Maple Park Bancshares, Inc. Employee Stock Ownership Trust 25,790 25,790 0 John F. and Kostia Pappas 2,525 2,525 0 Justin R. Krupp 1,034 1,034 0 Bridget A. Krupp 1,034 1,034 0 Thomas J. Krupp, II 1,034 1,034 0 James C. Krupp 1,034 1,034 0 Vincent and Anna Palazzolo 1,263 1,263 0 William E. Phillips 631 631 0 Leo E. and Patricia Elliott 252 252 0 Edward A. Rosenow 400 400 0 Richard and Kenneth Hintzsche 1,262 1,262 0 Robert R. Bowman 1,039 1,039 0 Mark Ringhouse 391 391 0 Charles J. and Lynn A. Shepard 450 450 0 Erin S. Pruess 384 384 0 Jill E. Pruess 384 384 0 Bertha and Mark A. Williams 136 136 0 Cari L. and Kenneth R. Zwick 136 136 0 Jeffrey S. and Todd E. Madden 53 53 0 Total: 111,706 111,706 0 <FN> ____________________ (1) Mr. Madden currently serves as Chief Executive Officer of Maple Park Mortgage Company, a wholly owned subsidiary of Old Second. Page 6 Description of Capital Stock The authorized capital stock of Old Second consists of 300,000 shares of Preferred Stock, without par value, and 6,000,000 shares of Common Stock, without par value. As of August_1, 1997, there was no Preferred Stock outstanding and 3,049,190 shares of Common Stock were outstanding. Dividend Rights Holders of Common Stock are entitled to receive such dividends as are declared by its Board of Directors out of funds legally available therefore. Because Old Second's consolidated net income consists largely of the net income of the Old Second Subsidiary Banks, Old Second's ability to pay dividends depends, in part, upon its receipt of dividends from such banks. Voting Rights Non-Cumulative Voting Holders of shares of Common Stock are entitled to one vote for each share of stock held by them. The shares of Common Stock do not have cumulative voting rights. This means that the holders of more than 50% of the shares of Common Stock voting for the election of directors can elect 100% of the class of directors standing for election at any meeting if they choose to do so, and in such event, the holders of the remaining shares voting for the election of directors will not be able to elect any person or persons to Old Second's Board of Directors at such meeting. Preemptive Rights The holders of Common Stock have no preemptive rights. Other Matters The Common Stock has no conversion rights, and is not subject to any redemption or sinking fund provisions or any further calls or assessments. The shares of Common Stock currently outstanding are fully paid and nonassessable. Subject to the preferential rights, if any, of any preferred stock that may be issued in the future, holders of shares of Common Stock are entitled to receive such dividends as may be declared from time to time by Old Second's Board of Directors from the assets of Old Second legally available therefor and, upon any liquidation of Old Second, a pro rata share of all assets of Old Second available for distribution to shareholders. Page 7 Certain Provisions of Old Second's Restated Certificate of Incorporation Old Second's Restated Certificate of Incorporation (the "Restated Certificate") and Bylaws differ from the charter of Maple Park in certain material respects. These differences, which are described below, are intended to encourage any person interested in acquiring Old Second to obtain the approval of its Board of Directors and to discourage takeovers by persons intending to eliminate the remaining stockholders' interest in a reorganization. Old Second believes that, in such a situation, the ability of the Board of Directors to represent effectively the interests of its stockholders will thereby be enhanced. However, a change in control of Old Second which is opposed by the Board of Directors could be made more difficult by these provisions, even if such a change were desired by a majority of the stockholders of Old Second. Old Second is not aware of any person who intends to acquire Old Second or seek a change in control of Old Second. Preferred Stock. Old Second is authorized to issue up to 300,000 shares of Preferred Stock, without par value (the "Preferred Stock"). No shares of the Preferred Stock are outstanding. The Preferred Stock is issuable in series established from time to time by the Board without further action by the Old Second stockholders. The Board of Directors of Old Second has broad authority to fix the number of shares included in each series and the designation, relative powers, preferences and rights, and the qualifications, limitations or restrictions of each series, including but not limited to dividend rates, redemption rights, conversion rights, voting rights (not to exceed one vote per share) and liquidation preferences. The authorized but unissued shares of Preferred Stock could be used by incumbent management to make a change in control of Old Second more difficult. Under certain circumstances such shares could be used to create voting impediments or to frustrate persons seeking to effect a takeover or otherwise gain control of Old Second. Such shares could be privately placed with purchasers who might side with the Board of Directors in opposing a hostile takeover bid. Elimination of Stockholder Action by Consent. Pursuant to Delaware law, unless otherwise provided in the certificate of incorporation, any action required or permitted to be taken by stockholders may be taken without a meeting and without a stockholder vote if a written consent setting forth the action to be taken is obtained. The Restated Certificate provides that stockholder action may only be taken at an annual or special meeting of stockholders and prohibits stockholder action by consent. This provision prevents the holders of a majority of the voting power of Old Second (or any other stockholders, for that matter) from using the written consent procedure to take stockholder action (although federal proxy rules might apply to the solicitation of such consents). Page 8 Classification of the Board of Directors. Article_X of the Restated Certificate provides the following: (1) Paragraph_A provides that the Board shall consist of a minimum of five and a maximum of twenty-five directors. The Board currently consists of fourteen members. Paragraph_A also authorizes the Board or the stockholders to determine the number of directors to be elected in the future. (2) Paragraph_B (as discussed below) provides for a classified Board. (3) Paragraph_C (as discussed below) provides that vacancies on the Board may be filled by a majority of the directors then in office, though less than a quorum, or by a sole remaining director, and that a director chosen to fill a vacancy shall hold office until the expiration of the term of the class for which such director is chosen. (4) Paragraph_D authorizes vacancies and newly created directorships of any series of Preferred Stock to be filled by a majority of the directors elected by the holders of such series then in office or by a sole remaining director so elected. (5) Paragraph_E provides that, unless provided for in the Bylaws, the election of directors need not be by written ballot. (6) Paragraph_F (as discussed below) provides for advance notification of nominations for directors. (7) Paragraph_G (as discussed below) provides that directors of Old Second may be removed from the Board only for cause and by the affirmative vote of the holders of 66-2/3% of the then outstanding capital stock eligible to vote thereon. (8) Paragraph_H provides that the business of Old Second shall be managed by the Board and authorizes the Board to exercise all powers not reserved for the stockholders. (9) Paragraph_I authorizes a limit on certain liabilities of directors of Old Second. See "Limitation of Director Liability." Classified Board. Article_X of the Restated Certificate provides that the Board be divided into three classes as nearly equal in number as possible. The provisions of this Article provide that any vacancy in the membership on the Board, resulting from an increase in the authorized number of directors, retirement, resignation, removal, or death, will be filled by the Board acting by a majority of the directors then in office, and any director so chosen shall serve for the remainder of the then present term of office of the class in which the vacancy shall have occurred or shall have been created. Page 9 The provisions of this Article make it more difficult and time-consuming to change majority control of the Board and thus reduce the vulnerability of Old Second to an unsolicited proposal for the takeover of Old Second that does not contemplate the acquisition of all of the Old Second outstanding shares, or an unsolicited proposal for the restructuring or sale of all or part of Old Second. The provisions of this Article may have significant effects on stockholders' ability to change the composition of the incumbent Board and to benefit from certain transactions which are opposed by the incumbent Board. The provisions of this Article may discourage or make more difficult a proxy contest or the assumption of control by a holder of a substantial block of the Old Second stock or the removal of the incumbent Board and could increase the likelihood that incumbent directors will retain their positions. Advance Notice Nomination of Directors. Paragraph_F of Article_X of the Restated Certificate requires any stockholder desiring to nominate a person to the Board to give not less than fourteen days nor more than sixty days prior notice of such nomination. Such notice shall contain certain required information concerning the nominee, including his name, address, principal occupation and number of shares of stock of Old Second beneficially owned by such nominee and by the nominating stockholder. Nominations not made in accordance with the procedure set forth in Article_X shall be disregarded. A possible effect of this provision may be that persons otherwise qualified to serve as directors and who are proposed for nomination and election by holders of a majority of the outstanding and voting shares may not be nominated or elected due to the failure to comply with this procedural requirement, whether due to inadvertence or otherwise. Such provision limits the ability of stockholders to nominate persons for the Board who might be interested in a change in control of Old Second. Increase in Stockholder Vote Required to Remove Directors. Pursuant to the Restated Certificate, the vote of the holders of 66-2/3% of the shares of outstanding capital stock of Old Second eligible to vote thereon are required to remove a director for cause. These provisions may have significant effects on stockholders' ability to change the composition of the incumbent Board and to benefit from certain transactions which are opposed by the incumbent Board. Circumvention Provision. Article_XI of the Restated Certificate provides that the anti-takeover provisions may not be amended or repealed without the affirmative vote of the holders of 75% of the then outstanding shares of Voting Stock (as defined in Article_XII). This provision is designed to prevent circumvention of the anti-takeover provisions of the Restated Certificate but would make it more difficult for the stockholders of Old Second to amend the Restated Certificate if the incumbent Board opposes such amendment. Page 10 Fair Price Provision. Article_XII of the Restated Certificate requires that certain procedural safeguards for the protection of noncontrolling stockholders be observed by a Related Person (as defined in Article_XII) if such Related Person seeks to effect a merger or certain other business combination ("Business Combination") which could eliminate or fundamentally change the interest of the noncontrolling stockholders. If these procedures are not complied with, or if the proposed Business Combination is not approved by a majority of the directors of Old Second who are unaffiliated with, and not a nominee of, the Related Person and either were members of the Board prior to the time that the Related Person became a Related Person or were recommended to succeed a Continuing Director by a majority of Continuing Directors on the Board at the time of such recommendation (the "Continuing Directors"), Article_XII requires that the Business Combination with the Related Person be approved by the holders of at least 75% of the outstanding Voting Stock (the "75% Stockholder Vote Requirement"). In the event that the requisite approval of the Board was given with respect to a particular Business Combination or the price criteria and procedural safeguards were satisfied, only a majority vote of the outstanding Voting Stock would be required. Tender offers or other non-open market acquisitions of stock are usually made at prices above the prevailing market price of a corporation's stock. In addition, acquisitions of stock by persons attempting to acquire control through market purchase may cause the market price of stock to reach levels which are higher than would otherwise be the case. Article_XII may discourage such purchases, particularly those of less than all Old Second shares, and may thereby deprive holders of the Old Second's stock of an opportunity to sell their stock at a premium above the market price. Because of the potentially higher vote requirements for stockholder approval of any subsequent Business Combination and the possibility of having to pay a higher price to other stockholders in such a Business Combination, it may become more costly for a purchaser to acquire control of Old Second. Article_XII may therefore decrease the likelihood that a tender offer will be made and, as a result, may adversely affect those stockholders who would desire to participate in a tender offer. In addition, a Related Person may be unable, as a practical matter, to comply with all of the procedural requirements of Article_XII. Further, the minimum price required under Article_XII may not necessarily be indicative of market value. Article_XII would also give veto power to the holders of a minority of the Voting Stock with respect to a Business Combination which is not approved by a majority of the Continuing Directors but which a majority of stockholders may believe to be desirable and beneficial. As of December_31, 1996, the directors, executive officers and certain key personnel of Old Second, as a group, beneficially owned approximately 4.7% of the outstanding shares of Common Stock. Article_XII might have the effect of maintaining the position of incumbent management and might also have the effect that the Board would have the power to defeat a Business Combination which is desired by holders of a majority, but less than 75%, of the Voting Stock. Nonmonetary Factors Provisions. Article_XIII of the Restated Certificate provides that, in evaluating acquisition proposals, the Board must take into account not only the consideration to be paid but also certain nonmonetary factors set forth in Article_XIII. Page 11 Those factors include: (a)_the adequacy of the amount to be paid in connection with any such transaction; (b)_the social and economic effects of the transaction on Old Second and its Subsidiaries (as defined in Article_XII), the employees, depositors, loan and other customers and creditors of Old Second and its Subsidiaries and the other elements of the communities in which Old Second and its Subsidiaries operate or are located; (c)_the business and financial condition and earnings prospects of the acquiring person or persons, including, but not limited to, debt service and other existing or likely financial obligations of the acquiring person or persons, and the possible effect of such conditions upon Old Second and its Subsidiaries and the other elements of the communities in which Old Second and its Subsidiaries operate or are located; (d)_the competence, experience, and integrity of the acquiring person or persons and its or their management; and (e)_any antitrust or other legal or regulatory issues which may be raised by any such transaction. Greenmail Prevention Provision. Article_XIV of the Restated Certificate is intended to discourage the speculator who, alone or with others, accumulates beneficial ownership of a significant block of stock and then, under the threat of making a tender offer, launching a proxy contest or instigating some other corporate disruption or upset, succeeds in extracting from the corporation involved a premium price for its shares, a tactic which has been dubbed "greenmail." The provisions would, in general, preclude Old Second from purchasing any Voting Stock at a per share price in excess of the Fair Market Value (as defined in Article_XII) as of the time of such purchase from a person known by Old Second to be a Substantial Stockholder (as defined in Article_XIV) unless such purchase has been approved by the affirmative vote of the holders of at least two-thirds of the Voting Stock held by Disinterested Stockholders (as defined in Article_XIV). The foregoing limitation would not apply to (1)_any purchase pursuant to an offer to purchase which is made on the same terms and conditions to the holders of all of the outstanding Voting Stock or (2)_any open market purchase that constitutes a Public Transaction (as defined in Article_XIV). Because this provision is designed to discourage accumulations of large blocks of Old Second's stock by purchasers whose objective is to have such stock repurchased by Old Second at a premium, this provision could tend to reduce the temporary fluctuations in the market price of Old Second's stock which are caused by accumulations of large blocks of Old Second's stock. Accordingly, stockholders could be deprived of possible opportunities to sell their stock at a temporarily higher market price. Limitations of Director Liability. Paragraph_I of Article_X of the Restated Certificate eliminates directors' liability to Old Second or its stockholders for monetary damages arising out of the directors' breach of their fiduciary duty of care. This provision does not affect the directors' liability for monetary damages for breaches of the duty of loyalty, actions or omissions involving bad faith, knowing violations of the law or intentional misconduct, paying an illegal dividend, approving an illegal stock repurchase, or obtaining an improper personal benefit. Page 12 Manner of Offering The Selling Stockholders, or any of them, may sell the Shares from time to time in transactions on the Nasdaq National Market System or in the over-the-counter market, or through private sales. All sales made on the Nasdaq National Market System or in the over- the-counter market shall be made at the then prevailing price of the Shares on such national market system or in such over-the- counter market, as applicable; any private sales will be made at negotiated prices. Sales of the Shares may be made to or through broker-dealers, and such broker-dealers may receive compensation in the form of discounts, concessions or commissions from the Selling Stockholders effecting such sales. The Selling Stockholders and any broker-dealers who act in connection with sales of Shares may be deemed to be "underwriters" as that term is defined in the Securities Act, and any commissions received by them and profit on any resale of the Shares may be deemed to be underwriting discounts and commissions under the Securities Act. The Selling Stockholders have advised Old Second that, during such time as they may be engaged in a distribution of the Shares, they will comply with Regulation_M, and the rules promulgated thereunder, under the Exchange Act and, in connection therewith, the Selling Stockholders have agreed not to engage in any stabilization activity in connection with Old Second's securities, to furnish to each broker-dealer through which the Shares may be offered copies of this Prospectus, and not to bid for or purchase any securities of Old Second or attempt to induce any person to purchase any of Old Second's securities except as permitted under the Exchange Act. The Selling Stockholders have also agreed to inform Old Second when the distribution of the Shares is completed. Regulation_M, and the rules promulgated thereunder, prohibit participants in a distribution from bidding for or purchasing, for an account in which the participant has a beneficial interest, any of the securities that are subject of the distribution. Regulation_M also governs bids and purchases made in order to stabilize the price of a security in connection with a distribution of the security. The Registration Rights Agreement provides that any public offering of the Shares by the Selling Stockholders will terminate on the earlier of (a) May 13, 1998 or (b) the date on which all Shares have been sold by the Selling Stockholders. Old Second has agreed with the Selling Stockholders to prepare and file with the Commission any amendments or supplements to the Registration Statement and this Prospectus as may be necessary to keep the Registration Statement effective through such offering period. The Registration Rights Agreement provides that Old Second indemnify the Selling Stockholders against certain liabilities, including liabilities under the Securities Act. The Registration Rights Agreement also provides for the indemnification of Old Second by the Selling Stockholders for certain liabilities, including liabilities under the Securities Act. In addition, under the Registration Rights Agreement, Old Second's obligation to indemnify extends to those who participate in the distribution of the Common Stock offered hereby as underwriters for the Selling Stockholders. Also pursuant to the Registration Rights Agreement, the Selling Stockholder will pay all applicable stock transfer taxes, brokerage commissions, underwriting discounts or commissions Page 13 and any fees of Selling Stockholder's counsel and accountants but Old Second has agreed to pay substantially all fees and expenses incident to the preparation, filing, amending and supplementing of the Registration Statement of which this Prospectus is a part. Validity of the Common Stock The validity of the Shares will be passed upon for Old Second by Schanlaber & Reed, A Professional Corporation, Aurora, Illinois. Experts The consolidated balance sheets of Old Second Bancorp, Inc. and subsidiaries as of December_31, 1996 and 1995, and the related consolidated statements of income, changes in stockholders' equity and cash flows for the two years in the period ended December_31, 1996, incorporated by reference in Old Second Bancorp, Inc.'s Annual Report (Form_10-K) for the year ended December_31, 1996 have been audited by Ernst & Young LLP, independent auditors, as set forth in their report thereon incorporated by reference therein and incorporated herein by reference. Such consolidated financial statements are incorporated herein by reference in reliance upon such report given upon the authority of such firms as experts in accounting and auditing. The consolidated balance sheet of Old Second Bancorp, Inc. as of December_31, 1994 and the related consolidated statements of income, changes in stockholders' equity and cash flows for the year ended December_31, 1994, prior to the restatement for the 1995 pooling-of-interest, incorporated by reference in this Registration Statement, have been audited by Coopers_& Lybrand, L.L.P., independent auditors, as stated in their report, which is incorporated by reference into this Registration Statement. Page 14 No person has been authorized to give any information or to make any representations other than those contained in this Prospectus, and, if given or made, such information or representations must not be relied upon as having been authorized. This Prospectus does not constitute an offer to sell or the solicitation of an offer to buy any securities other than the securities described in this Prospectus or an offer to sell or the solicitation of an offer to buy such securities in any circumstances in which such offer or solicitation is unlawful. Neither the delivery of this Prospectus nor any sale made hereunder or thereunder shall, under any circumstances, create any implication that there has been no change in the affairs of Old Second since the date hereof or that the information contained herein or therein is correct as of any time subsequent to the date of such information. ___________________ Table of Contents Prospectus Statement Prospectus Page Available Information 2 Incorporation of Certain Information by Reference 2 Old Second Bancorp, Inc. 3 Recent Developments 4 Proceeds of the Offering 4 Price Range of Common Stock and Dividend Policy 5 Selling Stockholders 5 Description of Capital Stock 7 Manner of Offering 13 Validity of the Common Stock 14 Experts 14 111,706 Shares Old Second Bancorp, Inc. Common Stock, without par value August , 1997 Part II Information Not Required in the Prospectus Item 14. Other Expenses of Issuance and Distribution. Old Second estimates that expenses in connection with the offering described in this Registration Statement, and which will be borne by Old Second, will be as follows: Registration fee . . . . . . . . . . . . . . . . . $ 1,654 Printing and engraving expenses. . . . . . . . . . . 0 Legal fees and expenses. . . . . . . . . . . . . . .10,000 Accountants' fees and expenses . . . . . . . . . . . 0 Miscellaneous. . . . . . . . . . . . . . . . . . . . 0 Total . . . . . . . . . . . . . . . . . . . . .$11,654 Item 15. Indemnification of Directors and Officers. Reference is made to Section_102(b)(7) of the Delaware General Corporation Law (the "DGCL"), which enables a corporation in its original certificate of incorporation or an amendment thereto to eliminate or limit the personal liability of a director to the corporation or its stockholders for monetary damages for breach of the director's fiduciary duty, except (i) for any breach of the director's duty of loyalty to the corporation or its stockholders, (ii) for acts or omissions not in good faith or which involve intentional misconduct or a knowing violation of law, (iii) pursuant to Section_174 of the DGCL (providing for liability of directors for unlawful payment of dividends or unlawful stock purchases or redemptions), or (iv) for any transaction from which the director derived an improper personal benefit. Old Second's Restated Certificate includes a provision eliminating the liability of directors consistent with Section_102(b)(7) of the DGCL. Reference also is made to Section_145 of the DGCL which provides that a corporation may indemnify any person, including officers and directors, who is, or is threatened to be made, a party to any threatened, pending or completed legal action, suit or proceeding, whether civil, criminal, administrative or investigative (other than an action by or in the right of such corporation), by reason of the fact that such person is or was an officer, director, employee or agent of such corporation, or is or was serving at the request of such corporation as a director, officer, employee or agent of another corporation or enterprise. The indemnity may include expenses (including attorney's fees), judgments, fines and amounts paid in settlement actually and reasonably incurred by such person in connection with such action, suit or proceeding, if such person acted in good faith and in a manner he reasonably believed to be in or not opposed to the corporation's best interests and, with respect to any criminal proceeding, had no reasonable cause to believe that his conduct was unlawful. A Delaware corporation may indemnify its officers, directors, employees and agents in an action by or in the right of the corporation under the same conditions, except that no indemnification is permitted without judicial approval if the officer, director, employee or agent is adjudged to be liable to the corporation. Where an officer, director, employee or agent is successful on the merits or otherwise in the defense of any action referred to above, the corporation must indemnify him against the expenses which such officer, director, employee or agent actually and reasonable incurred in connection therewith. Old Second's Restated Certificate provides for indemnification of directors and officers of Old Second to the full extent permitted by the DGCL. Old Second maintains a directors' liability policy to insure its liability under the above-described provision of its Restated Certificate and to insure individual directors against certain obligations not covered by such provisions. Item 16. Exhibits. *(5) Opinion of Schanlaber_& Reed, A Professional Corporation, regarding the Validity of the Common Stock. *(23) (a) Consent of Ernst_& Young LLP. *(23) (b) Consent of Coopers & Lybrand, LLP. *(23) (c) Consent of Schanlaber_& Reed, A Professional Corporation (included in Exhibit 5). ____________________ * Previously filed. Item 17. Undertakings. The undersigned registrant hereby undertakes: (1) To file, during any period in which offers or sales are being made of the securities registered hereby, a post- effective amendment to this registration statement: (i) To include any prospectus required by Section_10(a)(3) of the Securities Act of 1933; (ii) To reflect in the prospectus any facts or events arising after the effective date of the registration statement (or the most recent post-effective amendment thereof) which, individually or in the aggregate, represent a fundamental change in the information set forth in the registration statement. Notwithstanding the foregoing, any increase or decrease in volume of securities offered (if the total dollar value of securities offered would not exceed that which was registered) and any deviation from the low or high and of the estimated maximum offering range may be reflected in the form of prospectus filed with the Commission pursuant to Rule_424(b) if, in the aggregate, the changes in volume and price represent no more than a 20 percent change in the maximum aggregate offering price set forth in the "Calculation of Registration Fee" table in the effective registration statement; and Page II-2 (iii) To conclude any material information with respect to the plan of distribution not previously disclosed in the registration statement or any material change to such information in the registration statement; provided, however, that paragraphs_(1)(i) and (1)(ii) do not apply if the information required to be included in a post-effective amendment by those paragraphs is contained in periodic reports filed with or furnished to the Commission by the registrant pursuant to Section_13 or Section_15(d) of the Securities Exchange Act of 1934 that are incorporated by reference in this registration statement. (2) That, for the purpose of determining any liability under the Securities Act of 1933, each such post-effective amendment shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof. (3) To remove from registration by means of a post- effective amendment any of the securities being registered which remain unsold at the termination of the offering. The undersigned registrant hereby undertakes that, for purposes of determining any liability under the Securities Act of 1933, each filing of the registrant's annual report pursuant to Section_13(a) or Section_15(d) of the Securities Exchange Act of 1934 (and, where applicable, each filing of an employee benefit plan's annual report pursuant to Section_15(d) of the Securities Exchange Act of 1934) that is incorporated by reference in the registration statement shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof. Insofar as indemnification for liabilities arising under the Securities Act of 1933 may be permitted to directors, officers and controlling persons of the registrant pursuant to the provisions described under Item 15 above, or otherwise, the registrant has been advised that in the opinion of the Securities and Exchange Commission such indemnification is against public policy as expressed in the Act and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the registrant of expenses incurred or paid by a director, officer or controlling person of the registrant in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered, the registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Act and will be governed by the final adjudication of such issue. Page II-3 Signatures Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form_S-3 and has duly caused this amendment to registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Aurora, State of Illinois, on August_4, 1997. Old Second Bancorp, Inc. By /s/ James E. Benson Chairman, Chief Executive Officer and Director Pursuant to the requirements of the Securities Act of 1933, this amendment to Registration Statement has been signed below on August_4, 1997 by the following persons in the capacities indicated. Signature Title /s/ James E. Benson* Chairman, Chief James E. Benson Executive Officer and Director (Principal executive officer) /s/ Ronald J. Carlson President, Chief Financial Ronald J. Carlson Officer, Secretary and Director (Principal financial and accounting officer) /s/ Gary McCarter* Director Gary McCarter /s/ D. Chet McKee* Director D. Chet McKee /s/ Walter Alexander* Director Walter Alexander /s/ Joanne Hansen* Director Joanne Hansen /s/ Marvin Fagel* Director Marvin Fagel Page II-4 /s/ Kenneth Lindgren* Director Kenneth Lindgren /s/ Jesse Maberry* Director Jesse Maberry /s/ William Meyer* Director William Meyer /s/ Alan J. Rassi* Director Alan J. Rassi /s/ Larry Schuster* Director Larry Schuster /s/ William B. Skoglund* Director William B. Skoglund /s/ George Starmann III* Director George Starmann III Ronald J. Carlson, by signing his name hereto, does sign and execute this amendment to the Registration Statement on behalf of the above-named officers and directors of Old Second Bancorp, Inc. on the day of August 4, 1997, pursuant to the powers of attorney executed on behalf of each of such officers and directors and previously filed with the Securities and Exchange Commission. *By /s/ Ronald J. Carlson Ronald J. Carlson Attorney-in-Fact Page II-5