SUMMARY

The following summary highlights some of the information contained in this proxy statement/prospectus. This summary may not contain all of the information that is important to you. For a more complete description of the merger agreement, the merger and the other transactions contemplated thereby, Pyramid and Yuma encourage you to read carefully this entire proxy statement/prospectus, including the attached Annexes. We have defined certain oil and gas industry terms used in this proxy statement/prospectus in the “Glossary of Oil and Gas Terms” beginning on page [—].

The Companies

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Pyramid Oil Company

P. O. Box 832

Bakersfield, California 93302

(661) 325-1000

Pyramid is engaged in the business of the exploration, development and production of crude oil and natural gas. Pyramid acquires interests in land and producing properties through acquisitions and leases and then drills and/or operates crude oil or natural gas wells in efforts to discover and produce oil and gas. Crude oil and natural gas produced from these properties are sold to various refineries and pipeline companies. The majority of the oil and gas properties that Pyramid owns and operates are for its account. Pyramid also participates in joint ventures with other companies in the development of oil and gas properties. Although Pyramid owns some minor oil and gas interests in New York, Wyoming and Texas, all of its major revenue-producing properties are in California. Immediately prior to the completion of the merger, Pyramid intends to transfer most of its oil and gas working interests to a wholly-owned subsidiary.

Pyramid Merger Subsidiary, Inc.

P. O. Box 832

Bakersfield, California 93302

(661) 325-1000

Pyramid Merger Subsidiary, Inc., which we refer to as Merger Subsidiary, is a Delaware corporation and a direct wholly owned subsidiary of Pyramid and was formed solely for the purpose of consummating the merger. Pyramid Merger Subsidiary, Inc. has not carried on any activities to date, except for activities incidental to formation and activities undertaken in connection with the merger.

Yuma Energy, Inc.

1177 West Loop South, Suite 1825

Houston, Texas 77027

(713) 968-7000

Yuma Energy, Inc. is a U.S.-based oil and gas company focused on the exploration for, and development of, conventional and unconventional oil and gas prospects. Yuma’s predecessor was established in 1983. Yuma has employed a 3-D seismic-based strategy to build a multi-year inventory of development and exploration prospects. Yuma’s current operations are focused on onshore central Louisiana, where Yuma is targeting the Austin Chalk, Tuscaloosa, Wilcox, Frio, Marg Tex and Hackberry formations. In addition, Yuma has a non-operated position in the Bakken Shale in North Dakota. Yuma’s core competencies in generating oil and gas prospects include: unconventional oil plays; onshore liquids-rich projects; and high impact deep onshore prospects located beneath known producing trends, identified through the use of 3-D seismic surveys.

The Merger

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The Structure of the Merger

Pyramid has agreed to acquire Yuma under the terms and conditions set forth in the merger agreement, which we describe in this proxy statement/prospectus. Pursuant to the merger agreement, a newly formed subsidiary of Pyramid, which we refer to as “Merger Subsidiary,” will merge with and into Yuma, with Yuma continuing as the surviving corporation and a wholly owned subsidiary of Pyramid. We refer to this as the merger. This process is often called a “reverse merger” because a larger private company (Yuma) is merged with a subsidiary of a smaller public company (Pyramid). We have attached the merger agreement as Annex A to this proxy statement/prospectus. We encourage you to carefully read the merger agreement in its entirety. We currently expect that the merger will be completed in the third quarter of 2014. However, we cannot predict the actual timing of the completion of these transactions or if they will ultimately occur.

Merger Consideration

The merger agreement provides that at the effective time of the merger each share of Yuma common stock and preferred stock issued and outstanding immediately prior to the effective time will be converted into the right to receive shares of Pyramid common stock. In the merger, Pyramid agreed to issue 66,336,701 shares of its common stock to former Yuma stockholders at the effective time of the merger. No assurance can be given that the current fair market value of Pyramid common stock will be equivalent to the fair market value of Pyramid common stock on the date that the merger consideration is received by a Yuma stockholder or at any other time. The actual fair market value of the Pyramid common stock received by Yuma stockholders depends upon the fair market value of Pyramid common stock upon receipt, which may be higher or lower than the market price of Pyramid common stock on the date the merger was announced, on the date that this proxy statement/prospectus is mailed to Yuma’s stockholders, or on the date of the special meeting of Yuma stockholders.

Treatment of Yuma Restricted Stock Awards and Restricted Stock Units

Each restricted stock unit issued by Yuma under any stock option, purchase or award plan, program or arrangement and outstanding at the time of the merger shall be assumed by Pyramid, multiplied by the number of shares of Pyramid common stock to be received for each share of Yuma common stock in the merger and converted into the number of Pyramid restricted stock units described under “The Merger—Treatment of Yuma Restricted Stock Awards and Restricted Stock Units.” Each outstanding Yuma restricted share granted under any Yuma stock plan and which will not vest upon consummation of the merger, will be assumed by Pyramid, multiplied by the number of shares of Pyramid common stock to be received for each share of Yuma common stock in the merger and converted into Pyramid restricted shares. Any Yuma restricted shares that have vested or vest upon the closing of the merger shall be deemed outstanding and shall be entitled to their pro rata share of the merger consideration discussed below under “Ownership of Pyramid After the Merger” beginning on page [—].

Treatment of Pyramid Options and Pyramid Restricted Stock Awards

Options granted by Pyramid under the Pyramid stock option plan will remain outstanding and continue to represent rights to acquire shares of Pyramid common stock on the terms and conditions presently governing the stock options. Restricted stock granted by Pyramid under the Pyramid stock option plan will vest upon the closing of the merger.

Ownership of Pyramid After the Merger

Pyramid will issue 66,336,701 shares of Pyramid common stock to former Yuma stockholders pursuant to the merger. Immediately following the completion of the merger, Pyramid expects to have approximately 71,224,786 shares of its common stock outstanding. Yuma stockholders are therefore expected to hold approximately 93% of Pyramid’s common stock outstanding immediately after the merger. Consequently, Pyramid stockholders, as a general matter, will have less influence over the management and policies of Pyramid than they currently exercise.

Directors and Executive Officers of Pyramid After the Merger

The directors and executive officers of Pyramid prior to the merger will resign as directors and executive officers of Pyramid as part of the closing of the merger. Information concerning the six board nominees and the officers expected to be appointed to serve Pyramid upon closing of the merger is set forth in detail under “Management of Pyramid After Consummation of the Merger” beginning on page [—].

Effective Time and Completion of the Merger

Pyramid and Yuma hope to complete the merger as soon as reasonably practicable and expect the closing of the merger to occur in the third quarter of 2014. However, the merger is subject to the satisfaction or waiver of other conditions, and it is possible that factors outside the control of Pyramid and Yuma could result in the merger being completed at an earlier time, a later time or not at all. If the merger has not been completed on or before December 31, 2014, either Pyramid or Yuma may terminate the merger agreement unless the failure to complete the merger by that date is due to the failure of the party seeking to terminate the merger agreement to fulfill any material obligations under the merger agreement or a material breach of the merger agreement by such party.

Completion of the Merger is Subject to Certain Conditions

A number of conditions must be satisfied or waived, where legally permissible, before the merger can be consummated. These include, among others:

Neither Pyramid nor Yuma can give any assurance as to when or if all of the conditions to the consummation of the merger will be satisfied or waived or that the merger will occur.

It is a condition to Yuma’s obligations to complete the merger that the Yuma board of directors has a good faith belief that the merger will qualify as a “reorganization” within the meaning of Section 368(a) of the Code. This condition may be waived by Yuma, and in such event Yuma will undertake to recirculate and re-solicit its stockholders if the condition is waived and the change in tax consequences is material.

Termination of the Merger Agreement; Fees Payable

In general, the merger agreement may be terminated at any time prior to the effective time of the merger in the following ways, subject to certain exceptions discussed in “The Merger Agreement – Termination of the Merger Agreement”:

For purposes of these termination provisions, the term “acquisition proposal” means any offer or proposal, whether written or oral, from any person or group (as defined in Section 13(d)(3) of the Exchange Act) other than Pyramid or Yuma or any affiliates thereof (each, a “third party”) to acquire beneficial ownership of (a) 15% or more of any class of the equity securities of such party or (b) 15% or more of the fair market value of the assets of such party. The term “superior offer” means an unsolicited bona fide written offer by a third party to enter into (a) a merger, consolidation, business combination or other similar transaction as a result of which either (A) the stockholders of a party to the merger agreement prior to such transaction in the aggregate cease to own at least 50% of the voting securities of the entity surviving or resulting from such transaction (B) in which a person or group acquires beneficial ownership of securities representing 50% or more of the voting power of the party’s capital stock or (b) a sale, lease or other disposition of at least 50% of the assets of the party, taken as a whole, that: (A) was not obtained or made as a direct or indirect result of a breach of (or in violation of) the merger agreement; and (B) is on terms and conditions that the board of directors of Pyramid or Yuma, as applicable, determines, in its reasonable, good faith judgment, after obtaining and taking into account such matters that its board of directors deems relevant following consultation with its outside legal counsel and financial advisor is reasonably likely to be more favorable, from a financial point of view, to Pyramid’s stockholders or Yuma’s stockholders, as applicable, than the merger and the other transactions and is reasonably capable of consummation.

For more information regarding the rights of Pyramid and Yuma to terminate the merger agreement, see “The Merger Agreement—Termination of the Merger Agreement” beginning on page [—].

Except for the termination fee set forth in the merger agreement and as described below, all costs and expenses incurred in connection with the merger agreement and the transactions contemplated therein shall be paid by the party incurring such costs or expenses.

Under the merger agreement, Yuma may be required to pay to Pyramid or Pyramid may be required to pay Yuma a termination fee of $1.0 million if the merger agreement is terminated under certain circumstances. For more information regarding termination fees, see “The Merger Agreement—Termination of the Merger Agreement” beginning on page [—].

Payment of Termination Fee by Yuma. Yuma shall pay Pyramid a cash termination fee of $1.0 million (the “Yuma Termination Fee”) in the event that (i) Yuma terminates the merger agreement because it accepts a superior offer; (ii) Pyramid terminates the merger agreement as a result of a breach of a covenant by Yuma or because Yuma changes or fails to make its recommendation of the merger; or (iii) Pyramid terminates the merger agreement because Yuma stockholders fail to approve the merger; provided that in this instance (A) after the date of the merger agreement and prior to the date Yuma solicits the approval of Yuma’s stockholders, an acquisition proposal has been publicly announced and not withdrawn or abandoned at the time of termination, and (B) within one year after such termination, Yuma enters into a definitive agreement with respect to or consummates such acquisition proposal.

Payment of Termination Fee by Pyramid. Pyramid shall pay Yuma a cash termination fee of $1.0 million (the “Pyramid Termination Fee”) in the event that (i) Pyramid terminates the merger agreement because it accepts a superior offer; (ii) Yuma terminates the merger agreement as a result of a breach of a covenant by Pyramid; or (iii) Yuma terminates the merger agreement because Pyramid’s stockholders fail to approve the issuance of stock necessary to effect the merger; provided that in this instance (A) after the date of the merger agreement and prior to the Pyramid special meeting, an acquisition proposal has been publicly announced and not withdrawn or abandoned at the time of termination, and (B) within one year after such termination, Pyramid enters into a definitive agreement with respect to or consummates such acquisition proposal.

We May Amend the Terms of the Merger and Waive Rights Under the Merger Agreement

Subject to compliance with applicable law, Pyramid and Yuma may amend the merger agreement at any time before or after approval and adoption of the merger agreement by Pyramid and Yuma stockholders. However, after such approval and adoption there may not be, without further approval of Pyramid and Yuma stockholders, any amendment of the merger agreement that alters or changes, in a way that adversely affects the holders of any shares of Pyramid or Yuma capital stock or alters or changes the merger consideration to be received by the Yuma stockholders in the merger.

At any time prior to the effective time of the merger, Pyramid and Yuma may, to the extent legally allowed:

Any such waiver or extension is subject to certain conditions. See “The Merger Agreement—Amendment of the Merger Agreement.”

Regulatory Filings and Approvals Required to Complete the Merger

We are not aware of any material governmental or regulatory approvals required for the completion of the merger and compliance with the applicable corporate law of the States of California and Delaware.

The Special Meetings and Voting

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Pyramid Special Meeting of Stockholders

The special meeting of the stockholders of Pyramid will be for the following purposes:

Pyramid does not expect to transact any other business at the special meeting. Pyramid’s board of directors has fixed the close of business on [-], 2014 as the record date for determining those Pyramid stockholders entitled to vote at the special meeting and any adjournment or postponement thereof. Accordingly, only stockholders of record at the close of business on that date are entitled to notice of, and to vote at, the special meeting. A complete list of the Pyramid stockholders will be available for examination at the offices of Pyramid in Bakersfield, California during ordinary business hours for a period of 10 days prior to the special meeting.

The approval and adoption of the merger agreement and the approval of the proposals related to the Pyramid restated articles of incorporation each require the affirmative vote of the holders of at least a majority of the shares of Pyramid common stock issued and outstanding and entitled to vote at the Pyramid special meeting. The affirmative vote of the holders of at least a majority of the shares of Pyramid common stock represented in person or by proxy at the special meeting and voting on each such proposal, provided that such shares voting affirmatively must also constitute a majority of the required quorum for the meeting, is required to approve the proposal to approve and adopt the Pyramid 2014 Long-Term Incentive Plan and the proposal to adjourn the Pyramid special meeting, if necessary or appropriate, to solicit additional proxies in favor of the proposals listed above.

The board of directors of Pyramid recommends that Pyramid stockholders vote “FOR” each of the proposals to be voted on at the special meeting.

Yuma Special Meeting of Stockholders

The special meeting of the stockholders of Yuma will be for the following purposes:

Yuma’s board of directors has fixed the close of business on [-], 2014 as the record date for determining the holders of shares of Yuma common stock and preferred stock entitled to receive notice of and to vote at the Yuma special meeting and any adjournments or postponements thereof. Each holder of shares of Yuma common stock and preferred stock outstanding on the record date will be entitled to one vote for each share held of record upon each matter properly submitted at the Yuma special meeting and at any adjournment or postponement thereof. In order for Yuma to satisfy its quorum requirements, the holders of at least a majority of the total number of outstanding shares of Yuma common stock and preferred stock entitled to vote at the meeting must be present.

The approval of the merger agreement requires the affirmative vote of the holders of at least a majority of the shares of Yuma common stock issued and outstanding and entitled to vote at the Yuma special meeting. Approval of the merger agreement also requires the affirmative vote of the holders of two-thirds or 66⅔% of Yuma’s Series A and Series B preferred stock issued and outstanding and voting together separately as a class. The affirmative vote of a majority of the votes cast by holders of Yuma common stock at the Yuma special meeting is required to approve the proposal to adjourn the Yuma special meeting, if necessary or appropriate, to solicit additional proxies if there are insufficient votes at the time of the Yuma special meeting to approve and adopt the merger agreement.

Voting Agreements

Yuma has entered into an amended and restated voting agreement with Michael D. Herman, Chairman, Interim President and Chief Executive Officer of Pyramid, who owns approximately [-]% of the outstanding shares of Pyramid common stock as of the record date of the Pyramid special meeting of stockholders. The voting agreement provides, among other things, that Michael D. Herman will vote in favor of the proposal to approve and adopt the merger agreement and the proposals related to the Pyramid restated articles of incorporation. Mr. Herman also agreed not to sell, transfer or otherwise dispose of his shares of Pyramid common stock, subject to certain exceptions provided in the voting agreement.

Certain of Yuma’s officers and directors (and certain of their affiliates) who own in the aggregate approximately [-]% of the outstanding shares of Yuma common stock, approximately [-]% of the outstanding shares of Yuma Series A preferred stock, and approximately [-]% of the outstanding shares of Yuma Series B preferred stock as of the record date of the Yuma special meeting of stockholders entered into an amended and restated voting agreement with Pyramid, in which each stockholder agreed to vote in favor of the merger. Each stockholder also agreed not to sell, transfer or otherwise dispose of that stockholder’s shares of Yuma common stock and preferred stock, subject to certain exceptions provided in the voting agreement.

For more information regarding these voting agreements, see “Voting Agreements” on page [—].

Matters to be Considered in Deciding How to Vote

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Recommendation of the Pyramid Board of Directors and Its Reasons for the Merger

After careful consideration, the Pyramid board of directors approved the merger agreement on February 4, 2014. The Pyramid board of directors recommends that Pyramid stockholders vote “FOR” the proposal to approve and adopt the merger agreement; “FOR the proposals related to the restated articles of incorporation of Pyramid; “FOR” the proposal to approve and adopt the Pyramid 2014 Long-Term Incentive Plan; and “FOR” any proposal to authorize Pyramid’s board of directors to adjourn the special meeting. Because of their mutual dependence, if the proposal to approve and adopt the merger agreement or the proposals related to the restated articles of incorporation of Pyramid are not all approved, then none will be deemed to have been approved.

For the factors considered by Pyramid’s board of directors in reaching its decision to approve these matters as well as the Pyramid board of directors’ reasons for, and certain risks related to, the merger, see “The Merger—Recommendation of Pyramid’s Board of Directors and Reasons for the Merger” beginning on page [—].

Recommendation of the Yuma Board of Directors and Its Reasons for the Merger

After careful consideration, on February 4, 2014, the Yuma board of directors unanimously (i) determined that the merger is fair to and in the best interests of Yuma and its stockholders, (ii) declared the merger agreement and the transactions contemplated thereby advisable, and (iii) approved the merger, the merger agreement and the transactions contemplated thereby. The Yuma board of directors unanimously recommends that Yuma stockholders vote “FOR” the proposal to approve and adopt the merger agreement and the transactions contemplated by the merger agreement and “FOR” any adjournment proposal.

For the factors considered by the Yuma board of directors in reaching its decision to approve the merger agreement and approve the consummation of the transactions contemplated by the merger agreement, including the merger, as well as the Yuma board of directors’ reasons for, and certain risks related to, the merger, see “The Merger—Recommendation of Yuma’s Board of Directors and Reasons for the Merger” beginning on page [—].

Fairness Opinion of ROTH Capital Partners to the Pyramid Board of Directors

ROTH rendered its opinion to Pyramid’s board of directors that, as of the date of the opinion, based upon and subject to the qualifications, limitations and assumptions stated in its opinion, the exchange ratio (meaning the number of shares of Pyramid common stock to be issued for each share of Yuma common stock and preferred stock in the merger) is fair to Pyramid and its stockholders, from a financial point of view.

The full text of the written opinion of ROTH, dated February 5, 2014, which sets forth assumptions made, procedures followed, matters considered and limitations on the review undertaken in connection with the opinion, is attached as Annex D to this proxy statement/prospectus. ROTH provided its opinion for the information and assistance of Pyramid’s board of directors in connection with its consideration of the merger. ROTH’s opinion is not a recommendation as to how any holder of Pyramid’s common stock should vote with respect to the issuance of Pyramid common stock in the merger or any other matter.

Pursuant to a letter agreement dated December 20, 2013, Pyramid engaged ROTH to act as its financial advisor in connection with the contemplated merger transaction. As compensation for its services in connection with the merger, Pyramid paid ROTH $150,000 upon the delivery of its fairness opinion. Additional compensation equal to 1.5% of the merger consideration, in no event less than $300,000 nor more than $450,000, will be payable on completion of the merger. In addition, Pyramid has agreed to reimburse ROTH for its expenses, including attorneys’ fees and disbursements, and to indemnify ROTH and related persons against various liabilities.

Material U.S. Federal Income Tax Consequences of the Merger

Subject to the qualifications, limitations and assumptions described in “Material U.S. Federal Income Tax Consequences” beginning on page [—], the following five paragraphs are the opinion of TroyGould PC regarding the material U.S. federal income tax consequences of the merger:

Interests of Pyramid and Yuma Directors and Executive Officers in the Merger

In considering the recommendation of the boards of directors of Pyramid and Yuma with respect to the merger, stockholders should be aware that the executive officers and directors of Pyramid and Yuma have certain interests in the merger that may be different from, or in addition to, the interests of Pyramid and Yuma stockholders. Pyramid’s and Yuma’s boards of directors were aware of these interests and considered them, among other matters, when adopting resolutions to approve and adopt the merger agreement and recommending that their respective stockholders vote to approve and adopt the merger agreement. For a discussion of the possibly conflicting interests, see “The Merger—Interests of Yuma’s Directors and Executive Officers in the Merger” beginning on page [—] and “The Merger—Interests of Pyramid’s Directors and Executive Officers in the Merger” beginning on page [—]

Per Share Market Price and Dividend Information

The following table sets forth the closing prices per share of Pyramid common stock, as well as the implied value of the proposed merger consideration for each share of Yuma common stock (after conversion of Yuma preferred stock to Yuma common stock), on February 5, 2014, the last full trading day prior to the public announcement of the merger, and [-], 2014 the last full trading day that this information could practicably be calculated prior to the date of this proxy statement/prospectus, which was calculated by assuming that (A) 57,493 shares of Yuma common stock are issued and outstanding, (B) all issued and outstanding shares of Yuma Series A preferred stock convert into 19,954 shares of Yuma common stock, (C) all issued and outstanding shares of Yuma Series B preferred stock convert into 10,261 shares of Yuma common stock, and (D) no shares of Yuma common stock or preferred stock dissent, (E) Yuma does not issue any restricted stock awards to its employees between the date of this proxy statement/prospectus and the effective time of the merger, and (F) Pyramid issues 66,336,701 shares of its common stock in the merger..

Because the aggregate merger consideration is fixed and will not be adjusted as a result of changes in the market price of Pyramid common stock, the merger consideration equivalent will fluctuate with the market price of Pyramid common stock. The merger agreement does not include a price-based termination right or provisions that would limit the impact of increases or decreases in the market price of Pyramid common stock. You should obtain current market quotations for the Pyramid shares from a newspaper, the Internet or your broker prior to voting on the merger agreement.

Neither Pyramid nor Yuma paid dividends on its common stock during the past three years and neither company has any current intention of doing so in the foreseeable future.

Appraisal Rights

Holders of Yuma common stock and preferred stock have the right to dissent from the proposed merger and, subject to certain conditions provided for in Section 262 of the DGCL, are entitled to receive payment of the fair value of their Yuma common stock or preferred stock. Yuma stockholders will be bound by the terms of the merger unless they dissent by complying with all of the requirements of the Delaware dissenters’ rights statute. See “Dissenters’ Rights of Appraisal” beginning on page [—] for a summary of dissenters’ rights available to Yuma stockholders, which summary is not intended to be a complete statement of applicable Delaware law and is qualified in its entirety by reference to Section 262 of the DGCL which is set forth in its entirety as Annex E to this proxy statement/prospectus.

Pyramid stockholders do not have dissenter’s or appraisal rights in connection with the merger.

Comparison of the Rights of Stockholders of Yuma Energy, Inc. and Pyramid Oil Company

Holders of Yuma common stock and preferred stock hold stock in a Delaware corporation and will have different rights as stockholders of Pyramid, a California corporation, due to the different laws governing these companies. The differences are described in more detail under “Significant Differences Between the Corporation Laws of California and Delaware” beginning on page 147.

Selected Consolidated Historical Financial Data of Pyramid

Set forth below are selected data derived from Pyramid’s audited financial statements as of and for the years ended December 31, 2009 through 2013 and Pyramid’s unaudited financial statements as of and for the three months ended March 31, 2014 and 2013. This information should be read together with Pyramid’s financial statements and related notes and management’s discussion and analysis of operations and financial condition of Pyramid contained in this proxy statement/prospectus under the captions “Historical Financial Statements of Pyramid” and “Management’s Discussion and Analysis of Operations and Financial Condition of Pyramid,” respectively.

Selected Consolidated Historical Financial Data of Yuma

Set forth below are selected data derived from Yuma’s audited consolidated financial statements as of and for the years ended December 31, 2010 through 2013, Yuma’s unaudited consolidated financial statements as of and for the year ended December 31, 2009, and Yuma’s unaudited consolidated financial statements as of and for the three months ended March 31, 2014 and 2013. This information should be read together with Yuma’s consolidated financial statements and related notes and management’s discussion and analysis of operations and financial condition of Yuma contained in this proxy statement/prospectus under “Historical Consolidated Financial Statements of Yuma” and “Management’s Discussion and Analysis of Operations and Financial Condition of Yuma,” respectively.

Selected Unaudited Pro Forma Condensed Combined Financial Information

The merger will be accounted for under the Financial Accounting Standards Board’s Accounting Standards Codification Topic 805 which governs transactions that are considered to be reverse acquisitions for accounting purposes. In the merger, Pyramid is the acquiror for legal purposes, but for accounting purposes, Yuma will be deemed to be the acquiror and Pyramid the acquiree.

The following table shows information about Yuma’s financial condition and results of operations, including per share data, on a pro forma basis after giving effect to the merger of Pyramid and Yuma. We refer to this information in this proxy statement/prospectus as pro forma financial information. The table sets forth information relating to the merger as if it had become effective on March 31, 2014 with respect to balance sheet data (using currently available fair value information for Pyramid) and January 1, 2013, with respect to statement of operations data for the three months ended March 31, 2014 and for the year ended December 31, 2013. This unaudited pro forma financial information assumes that the merger will be accounted for using the purchase method of accounting and represents a current estimate based on available information of pro forma results of operations. The unaudited pro forma balance sheet data includes adjustments to record the assets and liabilities of Pyramid at their estimated fair values as of the date the merger is effective, and is subject to further adjustment as additional information becomes available and as additional analyses are performed. As part of the merger, Yuma’s outstanding preferred stock will be converted to common stock of the combined company and Yuma’s derivative liability will be reclassified to equity of the combined company; and these adjustments have been made to reflect the conversion of Yuma’s preferred stock to common stock.

The merger agreement provides that Pyramid issue approximately 66,336,701 shares of common stock as consideration to Yuma stockholders.

This table should be read together with, and is qualified in its entirety by, the historical financial statements, including the notes thereto, of Pyramid and Yuma appearing elsewhere in this proxy statement/prospectus and the more detailed unaudited pro forma condensed combined financial information, including the notes thereto, appearing under “Unaudited Pro Forma Condensed Combined Financial Information” beginning on page [•].

The unaudited pro forma financial information, while helpful in illustrating the financial characteristics of the combined company using certain assumptions, does not reflect the impact of possible revenue enhancements, expense efficiencies and asset dispositions, among other factors that may result as a consequence of the merger and, accordingly, does not attempt to predict or suggest future results. It also does not necessarily reflect what the historical results of the combination would have been had they occurred as of the beginning of such periods.

Summary Pro Forma Combined Oil, Natural Gas and Natural Gas Liquids Reserve and Production Data

The following table sets forth information with respect to the historical and pro forma combined estimated oil, natural gas and natural gas liquids, or NGLs, reserves as of December 31, 2013 of Yuma and Pyramid. This pro forma information gives effect to the merger as if it occurred on December 31, 2013. The Yuma and Pyramid reserve data presented below was derived from independent engineering reports of each company.  Netherland, Sewell & Associates, Inc. (“NSAI”) prepared the Yuma reserve estimates as of December 31, 2013, and MHA Petroleum Consultants, Inc. (“MHA”) prepared the Pyramid reserve estimates as of December 31, 2013. Future exploration, exploitation and development expenditures, as well as future commodity prices and service costs, will affect the reserve volumes attributable to the acquired properties. The reserve estimates shown below were determined using a 12-month average price for oil, natural gas and natural gas liquids for the year ended December 31, 2013.