Exhibit 4.5

DESCRIPTION OF CAPITAL STOCK

The following description of Concrete Pumping Holdings, Inc.’s (the “Company,” “we” or “us”) capital stock is a summary and does not purport to be complete. It is subject to and qualified in its entirety by reference to the Company’s Amended and Restated Certificate of Incorporation (the “Charter”), the Company’s Amended and Restated Bylaws (the “Bylaws”) and the Certificate of Designations, Preferences and Rights of the Company’s Series A Zero-Dividend Convertible Perpetual Preferred Stock (the “Certificate of Designations”), each of which are incorporated by reference as an exhibit to the Annual Report on Form 10-K of which this Exhibit 4.5 is a part. We encourage you to read the Charter, the Bylaws, the Certificate of Designations and the applicable provisions of the Delaware General Corporation Law, for additional information.

General

Our Charter authorizes us to issue up to 500,000,000 shares of common stock, $0.0001 par value per share, and 10,000,000 shares of preferred stock, $0.0001 par value per share.

Common Stock

Dividend rights

Subject to preferences that may be applicable to any then outstanding preferred stock, holders of our common stock are entitled to receive such dividends, if any, as may be declared from time-to-time by our Board of Directors out of legally available funds.

Voting rights

Each holder of common stock is entitled to one vote for each share on all matters properly submitted to a vote of the stockholders, including the election of directors. Our stockholders do not have cumulative voting rights in the election of directors. Accordingly, holders of a majority of the voting shares are able to elect all of the directors.

Liquidation

Subject to applicable law, the rights, if any, of the holders of any outstanding series of the preferred stock, in the event of any voluntary or involuntary liquidation, dissolution or winding up of the Company, after payment or provision for payment of the debts and other liabilities of the Company, the holders of shares of our common stock will be entitled to receive all the remaining assets of the Company available for distribution to its stockholders, ratably in proportion to the number of shares of common stock held by them.

Rights and preferences

Holders of our common stock have no preemptive, conversion, subscription or other rights, and there are no redemption or sinking fund provisions applicable to our common stock. The rights, preferences, and privileges of the holders of our common stock are subject to and may be adversely affected by, the rights of the holders of shares of any series of our preferred stock that we may designate in the future.

Preferred Stock

Our Board has the authority, without further action by our stockholders, to issue up to 10,000,000 shares of preferred stock in one or more series and to fix the rights, preferences, privileges, and restrictions thereof. These rights, preferences, and privileges could include dividend rights, conversion rights, voting rights, terms of redemption, liquidation preferences, sinking fund terms, and the number of shares constituting any series or the designation of such series, any or all of which may be greater than the rights of our common stock. The issuance of preferred stock could adversely affect the voting power of holders of our common stock and the likelihood that such holders will receive dividend payments and payments upon liquidation. In addition, the issuance of preferred stock could have the effect of delaying, deferring, or preventing a change of control of the Company or other corporate action.

On December 6, 2018, the closing date (the “Closing”) of the Company’s business combination (the “Business Combination”) with Industrea Acquisition Corp. (“Industrea”), pursuant to that certain subscription agreement, dated as of September 7, 2018, by and between the Company and Nuveen Alternatives Advisors, LLC, on behalf of one or more funds or accounts (“Nuveen”), the Company issued to Nuveen 2,450,980 shares of the Company’s Series A Zero-Dividend Convertible Perpetual Preferred Stock (“Series A Preferred Stock”) at a price of $10.20 per share, for an aggregate cash purchase price of $25.0 million. The Series A Preferred Stock will not pay dividends and will be convertible into shares of our common stock at a 1:1 ratio (subject to customary adjustments) at any time following six months after the Closing. We will have the right to elect to redeem all or a portion of the Series A Preferred Stock at our election after four years for cash at a redemption price equal to the amount of the principal investment plus an additional cumulative amount that will accrue at an annual rate of 7.0% thereon. In addition, if the volume weighted average price of shares of our common stock equals or exceeds $13.00 for 30 consecutive days, then we will have the right to require the holder of the Series A Preferred Stock to convert its Series A Preferred Stock into common stock, at a ratio of 1:1 (subject to customary adjustments). We have also agreed to provide certain registration rights with respect to the shares of common stock underlying the Series A Preferred Stock.

Stockholders Agreement

In connection with the Business Combination, the Company, the CFLL Sponsor Holdings, LLC (“CFLL Sponsor”), the Argand Investor, certain former holders of the Company’s capital stock (“CPH stockholders”), and Industrea’s former independent directors entered into the Stockholders Agreement, which was amended on April 1, 2019. Pursuant to the Stockholders Agreement:

In addition, transfers of these securities are permitted in certain limited circumstances as set forth in the Stockholders Agreement, including with the prior written consent of our Board of Directors (with any director who has been designated to serve on our Board by or who is an affiliate of the requesting party abstaining from such vote) and to “affiliates,” as defined in the Stockholders Agreement.

In addition, pursuant to the terms of that certain rollover agreement, dated as of September 7, 2018, among the Company, CFLL Sponsor, Peninsula and the other parties thereto, Peninsula has exercised its right to designate three individuals to serve on our Board: one to serve as a Class I director, one to serve as a Class II director, and one to serve as a Class III director. Under the Stockholders Agreement, Peninsula has nomination rights with respect to: (i) one director for as long as Peninsula beneficially owns more than 5% and up to 15% of the issued and outstanding shares of our common stock; (ii) two individuals for as long as Peninsula beneficially owns more than 15% and up to 25% of the issued and outstanding shares of our common stock; and (iii) three directors for as long as Peninsula owns more than 25% of the issued and outstanding shares of our common stock. If Peninsula’s beneficial ownership falls below one of these thresholds, Peninsula’s nomination right in respect of such threshold will permanently expire. On December 9, 2018, Peninsula designated and we appointed each of M. Brent Stevens, Matthew Homme and Raymond Cheesman to serve on our Board.

The Stockholders Agreement also provides that these stockholders will have certain demand and/or “piggyback” registration rights with respect to the shares of common stock held by them. We will bear certain expenses incurred in connection with the exercise of such rights.

Public Warrants

Effective upon the consummation of the Business Combination, each warrant outstanding for the purchase of one share of Industrea’s common stock prior to the consummation of the Business Combination became exercisable for one share of our common stock, with all other terms of such warrants remaining unchanged. The following is a description of the warrants.

Each public warrant entitles the registered holder to purchase one whole share of common stock at a price of $11.50 per share, subject to adjustment as discussed below, at any time commencing on January 5, 2019. The public warrants will expire on December 6, 2023, at 5:00 p.m., New York City time, or earlier upon redemption or liquidation. As of October 31, 2019, there were 13,017,777 public warrants outstanding.

We will not be obligated to deliver any shares of common stock pursuant to the exercise of a public warrant and will have no obligation to settle such public warrant exercise unless a registration statement under the Securities Act with respect to the shares of common stock underlying the public warrants is then effective and a prospectus relating thereto is current, subject to the Company satisfying its obligations described below with respect to registration. No public warrant will be exercisable and we will not be obligated to issue shares of common stock upon exercise of a public warrant unless common stock issuable upon such public warrant exercise has been registered, qualified or deemed to be exempt under the securities laws of the state of residence of the registered holder of the public warrants. In the event that the conditions in the two immediately preceding sentences are not satisfied with respect to a public warrant, the holder of such public warrant will not be entitled to exercise such public warrant and such public warrant may have no value and expire worthless. In no event will we be required to net cash settle any public warrant. In the event that a registration statement is not effective for the exercised public warrants, the purchaser of a unit containing such public warrant will have paid the full purchase price for the unit solely for the share of common stock underlying such unit.

We registered the issuance of the shares of common stock issuable upon exercise of the public warrants pursuant to the registration statement of which the proxy statement/prospectus formed. Under the Warrant Agreement, we are required to maintain a current prospectus relating to those shares of common stock until the public warrants expire or are redeemed, as specified in the Warrant Agreement. A registration statement covering the shares of common stock issuable upon exercise of the public warrants was declared effective by the SEC on February 15, 2019. If, at any time, prior to the expiration or redemption of the public warrants, as specified in the Warrant Agreement, we fail to maintain an effective registration statement with respect to such shares, warrant holders may exercise their public warrants on a “cashless basis” in accordance with Section 3(a)(9) of the Securities Act or another exemption. Notwithstanding the above, if our common stock is at the time of any exercise of a public warrant not listed on a national securities exchange such that it satisfies the definition of a “covered security” under Section 18(b)(1) of the Securities Act, we may, at our option, require holders of public warrants who exercise their warrants to do so on a “cashless basis” in accordance with Section 3(a)(9) of the Securities Act and, in the event we so elect, we will not be required to file or maintain in effect a registration statement, and in the event we do not so elect, we will be required to register or qualify the shares under applicable blue sky laws to the extent an exemption is not available.

Once the public warrants become exercisable, we may call the public warrants for redemption:

If and when the public warrants become redeemable by us, we may exercise our redemption right even if we are unable to register or qualify the underlying securities for sale under all applicable state securities laws.

We have established the last of the redemption criterion discussed above to prevent a redemption call unless there is at the time of the call a significant premium to the warrant exercise price. If the foregoing conditions are satisfied and we issue a notice of redemption of the public warrants, each warrant holder will be entitled to exercise his, her or its public warrant prior to the scheduled redemption date. However, the price of our common stock may fall below the $18.00 redemption trigger price as well as the $11.50 warrant exercise price (for whole shares) after the redemption notice is issued.

If we call the public warrants for redemption as described above, our management will have the option to require any holder that wishes to exercise his, her or its public warrant to do so on a “cashless basis.” In determining whether to require all holders to exercise their public warrants on a “cashless basis,” our management will consider, among other factors, our cash position, the number of public warrants that are outstanding and the dilutive effect on our stockholders of issuing the maximum number of shares of common stock issuable upon the exercise of our public warrants. If our management takes advantage of this option, all holders of public warrants would pay the exercise price by surrendering their public warrants for that number of shares of common stock equal to the quotient obtained by dividing (x) the product of the number of shares of common stock underlying the public warrants, multiplied by the difference between the exercise price of the public warrants and the “fair market value” (defined below) by (y) the fair market value. The “fair market value” shall mean the average reported last sale price of our common stock for the 10 trading days ending on the third trading day prior to the date on which the notice of redemption is sent to the holders of public warrants. If our management takes advantage of this option, the notice of redemption will contain the information necessary to calculate the number of shares of common stock to be received upon exercise of the public warrants, including the “fair market value” in such case. Requiring a cashless exercise in this manner will reduce the number of shares to be issued and thereby lessen the dilutive effect of a warrant redemption. We believe this feature is an attractive option to us if we do not need the cash from the exercise of the public warrants.

A holder of a public warrant may notify us in writing in the event it elects to be subject to a requirement that such holder will not have the right to exercise such public warrant, to the extent that after giving effect to such exercise, such person (together with such person’s affiliates), to the warrant agent’s actual knowledge, would beneficially own in excess of 4.9% or 9.8% (as specified by the holder) of the shares of common stock outstanding immediately after giving effect to such exercise.

If the number of outstanding shares of common stock is increased by a stock dividend payable in shares of common stock, or by a split-up of shares of common stock or other similar event, then, on the effective date of such stock dividend, split-up or similar event, the number of shares of common stock issuable on exercise of each public warrant will be increased in proportion to such increase in the outstanding shares of common stock. A rights offering to holders of common stock entitling holders to purchase shares of common stock at a price less than the fair market value will be deemed a stock dividend of a number of shares of common stock equal to the product of (i) the number of shares of common stock actually sold in such rights offering (or issuable under any other equity securities sold in such rights offering that are convertible into or exercisable for common stock) multiplied by (ii) one minus the quotient of (x) the price per share of common stock paid in such rights offering divided by (y) the fair market value. For these purposes (i) if the rights offering is for securities convertible into or exercisable for common stock, in determining the price payable for common stock, there will be taken into account any consideration received for such rights, as well as any additional amount payable upon exercise or conversion and (ii) fair market value means the volume weighted average price of common stock as reported during the ten trading day period ending on the trading day prior to the first date on which the shares of common stock trade on the applicable exchange or in the applicable market, regular way, without the right to receive such rights.

In addition, if we, at any time while the public warrants are outstanding and unexpired, pay a dividend or make a distribution in cash, securities or other assets to the holders of common stock on account of such shares of common stock (or other shares of our capital stock into which the public warrants are convertible), other than (a) as described above, or (b) certain ordinary cash dividends, then the warrant exercise price will be decreased, effective immediately after the effective date of such event, by the amount of cash and/or the fair market value of any securities or other assets paid on each share of common stock in respect of such event.

If the number of outstanding shares of our common stock is decreased by a consolidation, combination, reverse stock split or reclassification of shares of common stock or other similar event, then, on the effective date of such consolidation, combination, reverse stock split, reclassification or similar event, the number of shares of common stock issuable on exercise of each public warrant will be decreased in proportion to such decrease in outstanding shares of common stock.

Whenever the number of shares of common stock purchasable upon the exercise of the public warrants is adjusted, as described above, the warrant exercise price will be adjusted by multiplying the warrant exercise price immediately prior to such adjustment by a fraction (x) the numerator of which will be the number of shares of common stock purchasable upon the exercise of the public warrants immediately prior to such adjustment, and (y) the denominator of which will be the number of shares of common stock so purchasable immediately thereafter.

In case of any reclassification or reorganization of the outstanding shares of common stock (other than those described above or that solely affects the par value of such shares of common stock), or in the case of any merger or consolidation of us with or into another corporation (other than a consolidation or merger in which we are the continuing corporation and that does not result in any reclassification or reorganization of our outstanding shares of common stock), or in the case of any sale or conveyance to another corporation or entity of the assets or other property of us as an entirety or substantially as an entirety in connection with which we are dissolved, the holders of the public warrants will thereafter have the right to purchase and receive, upon the basis and upon the terms and conditions specified in the public warrants and in lieu of the shares of our common stock immediately theretofore purchasable and receivable upon the exercise of the rights represented thereby, the kind and amount of shares of stock or other securities or property (including cash) receivable upon such reclassification, reorganization, merger or consolidation, or upon a dissolution following any such sale or transfer, that the holder of the public warrants would have received if such holder had exercised their public warrants immediately prior to such event. However, if such holders were entitled to exercise a right of election as to the kind or amount of securities, cash or other assets receivable upon such consolidation or merger, then the kind and amount of securities, cash or other assets for which each public warrant will become exercisable will be deemed to be the weighted average of the kind and amount received per share by such holders in such consolidation or merger that affirmatively make such election, and if a tender, exchange or redemption offer has been made to and accepted by such holders under circumstances in which, upon completion of such tender or exchange offer, the maker thereof, together with members of any group (within the meaning of Rule 13d-5(b)(1) under the Exchange Act) of which such maker is a part, and together with any affiliate or associate of such maker (within the meaning of Rule 12b-2 under the Exchange Act) and any members of any such group of which any such affiliate or associate is a part, own beneficially (within the meaning of Rule 13d-3 under the Exchange Act) more than 50% of the outstanding shares of common stock, the holder of a public warrant will be entitled to receive the highest amount of cash, securities or other property to which such holder would actually have been entitled as a stockholder if such warrant holder had exercised the public warrant prior to the expiration of such tender or exchange offer, accepted such offer and all of our common stock held by such holder had been purchased pursuant to such tender or exchange offer, subject to adjustments (from and after the consummation of such tender or exchange offer) as nearly equivalent as possible to the adjustments provided for in the Warrant Agreement. Additionally, if less than 70% of the consideration receivable by the holders of common stock in such a transaction is payable in the form of common stock in the successor entity that is listed for trading on a national securities exchange or is quoted in an established over-the-counter market, or is to be so listed for trading or quoted immediately following such event, and if the registered holder of the public warrant properly exercises the public warrant within thirty days following public disclosure of such transaction, the warrant exercise price will be reduced as specified in the Warrant Agreement based on the per share consideration minus Black-Scholes Warrant Value (as defined in the Warrant Agreement) of the public warrant. The purpose of such exercise price reduction is to provide additional value to holders of the public warrants when an extraordinary transaction occurs during the exercise period of the public warrants pursuant to which the holders of the public warrants otherwise do not receive the full potential value of the public warrants.

The warrants were issued in registered form under a Warrant Agreement between Continental Stock Transfer & Trust Company, as warrant agent, and Industrea, which was assumed by the Company upon the consummation of the Business Combination. The Warrant Agreement provides that the terms of the warrants may be amended without the consent of any holder to cure any ambiguity or correct any defective provision, but requires the approval by the holders of at least 65% of the then outstanding public warrants to make any change that adversely affects the interests of the registered holders of public warrants.

The warrants may be exercised upon surrender of the warrant certificate on or prior to the expiration date at the offices of the warrant agent, with the exercise form on the reverse side of the warrant certificate completed and executed as indicated, accompanied by full payment of the exercise price (or on a cashless basis, if applicable), by certified or official bank check payable to us, for the number of public warrants being exercised. The warrant holders do not have the rights or privileges of holders of common stock and any voting rights until they exercise their public warrants and receive shares of common stock. After the issuance of shares of common stock upon exercise of the public warrants, each holder will be entitled to one vote for each share held of record on all matters to be voted on by stockholders.

Certain Anti-Takeover Provisions of Delaware Law, Our Charter and Our Bylaws

We are currently subject to the provisions of Section 203 of the DGCL (“Section 203”) regulating corporate takeovers. Section 203 prevents certain Delaware corporations, under certain circumstances, from engaging in a “business combination” with:

A “business combination” includes a merger or sale of more than ten percent (10%) of the Company’s assets. However, the above provisions of Section 203 do not apply if:

Our Charter provides that our Board is classified into three classes of directors. As a result, in most circumstances, a person can gain control of our Board only by successfully engaging in a proxy contest at two or more annual meetings.

In addition, our Charter does not provide for cumulative voting in the election of directors. Our Board of Directors is empowered to elect a director to fill a vacancy created by the expansion of our Board or the resignation, death, or removal of a director in certain circumstances; and our advance notice provisions require that stockholders must comply with certain procedures in order to nominate candidates to our Board or to propose matters to be acted upon at a stockholders’ meeting.

Authorized but unissued common stock and preferred stock are available for future issuances without stockholder approval and could be utilized for a variety of corporate purposes, including future offerings to raise additional capital, acquisitions and employee benefit plans. The existence of authorized but unissued and unreserved common stock and preferred stock could render more difficult or discourage an attempt to obtain control of us by means of a proxy contest, tender offer, merger or otherwise.

Dividends

We have not paid any cash dividends on our common stock to date. The payment of cash dividends in the future will be dependent upon our revenues and earnings, if any, capital requirements and general financial condition. The payment of any cash dividends will be within the discretion of our Board at such time. Our Board is not currently contemplating and does not anticipate declaring any stock dividends in the foreseeable future. Further, if we incur any indebtedness, our ability to declare dividends may be limited by restrictive covenants we may agree to in connection therewith.

Exclusive Forum Provision

Our Charter provides that, unless we consent in writing to the selection of an alternative forum, the Court of Chancery of the State of Delaware shall be the sole and exclusive forum for any stockholder (including a beneficial owner) to bring (i) any derivative action or proceeding brought on behalf of the Company, (ii) any action asserting a claim of breach of a fiduciary duty owed by any director, officer or other employee of the Company to the Company or its stockholders, (iii) any action asserting a claim against the Company, its directors, officers or employees arising pursuant to any provision of the DGCL, our Charter or our Bylaws, or (iv) any action asserting a claim against the Company, its directors, officers or employees governed by the internal affairs doctrine, except for, as to each of  (i) through (iv) above, any claim (A) as to which the Court of Chancery determines that there is an indispensable party not subject to the jurisdiction of the Court of Chancery (and the indispensable party does not consent to the personal jurisdiction of the Court of Chancery within ten days following such determination), (B) which is vested in the exclusive jurisdiction of a court or forum other than the Court of Chancery, or (C) arising under the Securities Act or for which the Court of Chancery does not have subject matter jurisdiction including, without limitation, any claim arising under the Exchange Act, both as to which the federal district court for the District of Delaware shall be the sole and exclusive forum.

Any person or entity purchasing or otherwise acquiring any interest in shares of our capital stock will be deemed to have notice of, and consented to, the provisions of our Charter described in the preceding paragraph. This choice of forum provision may limit a stockholder’s ability to bring a claim in a judicial forum that it finds favorable for disputes with the Company or its directors, officers or other employees, which may discourage such lawsuits against the Company and such persons. Alternatively, if a court were to find these provisions of our Charter inapplicable to, or unenforceable in respect of, one or more of the specified types of actions or proceedings, we may incur additional costs associated with resolving such matters in other jurisdictions, which could adversely affect its business, financial condition or results of operations.

Limitations of Liability and Indemnification

Our Charter and our Bylaws provide that we will indemnify our directors and officers, and may indemnify our employees and other agents, to the fullest extent permitted by the DGCL, which prohibits our Charter from limiting the liability of its directors for the following:

If Delaware law is amended to authorize corporate action further eliminating or limiting the personal liability of a director, then the liability of our directors will be eliminated or limited to the fullest extent permitted by Delaware law, as so amended. Our Charter does not eliminate a director’s duty of care and, in appropriate circumstances, equitable remedies, such as injunctive or other forms of non-monetary relief, remain available under Delaware law. This provision also does not affect a director’s responsibilities under any other laws, such as the federal securities laws or other state or federal laws. Under our Bylaws, we are empowered to purchase insurance on behalf of any person whom it is required or permitted to indemnify.

In addition to the indemnification required in our Charter and our Bylaws, we have entered into indemnification agreements with each of our directors, officers, and some employees, effective upon consummation of the Business Combination. These agreements provide for the indemnification of such directors, officers, and employees for certain expenses and liabilities incurred in connection with any action, suit, proceeding, or alternative dispute resolution mechanism, or hearing, inquiry, or investigation that may lead to the foregoing, to which they are a party, or are threatened to be made a party, by reason of the fact that they are or were a director, officer, employee, agent, or fiduciary of the Company, or any of its subsidiaries, by reason of any action or inaction by them while serving as an officer, director, employee, agent, or fiduciary, or by reason of the fact that they were serving at the Company request as a director, officer, employee, agent, or fiduciary of another entity. In the case of an action or proceeding by or in the right of the Company or any of its subsidiaries, no indemnification will be provided for any claim where a court determines that the indemnified party is prohibited from receiving indemnification. We believe that the provisions of its certificate of incorporation and bylaws described above and these indemnification agreements are necessary to attract and retain qualified persons as directors and officers. We also maintain directors’ and officers’ liability insurance.

The limitation of liability and indemnification provisions in our Charter and our Bylaws may discourage stockholders from bringing a lawsuit against directors for breach of their fiduciary duties. They may also reduce the likelihood of derivative litigation against directors and officers, even though an action, if successful, might benefit the Company and its stockholders. A stockholder’s investment may be harmed to the extent that we pay the costs of settlement and damage awards against directors and officers pursuant to these indemnification provisions.

Insofar as indemnification for liabilities arising under the Securities Act may be permitted to our directors, officers, and controlling persons pursuant to the foregoing provisions, or otherwise, we have been advised that, in the opinion of the SEC, such indemnification is against public policy as expressed in the Securities Act, and is, therefore, unenforceable.

There is no pending litigation or proceeding naming any of our directors or officers as to which indemnification is being sought, nor are we aware of any pending or threatened litigation that may result in claims for indemnification by any director or officer.

Listing of Securities

Our common stock is currently listed on Nasdaq under the symbol “BBCP” and our public warrants are quoted on the OTC Pink marketplace operated by OTC Markets Group, Inc. under the symbol “BBCPW.”

Transfer Agent and Registrar

The transfer agent and registrar for our common stock is Continental Stock Transfer & Trust Company.

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