3 of 16 FORM 10-Q SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 (Mark One) (X) QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 1999 OR ( ) TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from ________________ to ________________ Commission file number 0-20299 SOUTHWEST OIL & GAS 1990-91 INCOME PROGRAM Southwest Oil & Gas Income Fund X-C, L.P. (Exact name of registrant as specified in its limited partnership agreement) Delaware 75-2374445 (State or other jurisdiction of (I.R.S. Employer incorporation or organization) Identification No.) 407 N. Big Spring, Suite 300 Midland, Texas 79701 (Address of principal executive offices) (915) 686-9927 (Registrant's telephone number, including area code) Indicate by check mark whether registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days: Yes X No The total number of pages contained in this report is 17. PART I. - FINANCIAL INFORMATION Item 1. Financial Statements The unaudited condensed financial statements included herein have been prepared by the Registrant (herein also referred to as the "Partnership") in accordance with generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments necessary for a fair presentation have been included and are of a normal recurring nature. The financial statements should be read in conjunction with the audited financial statements and the notes thereto for the year ended December 31, 1998 which are found in the Registrant's Form 10-K Report for 1998 filed with the Securities and Exchange Commission. The December 31, 1998 balance sheet included herein has been taken from the Registrant's 1998 Form 10-K Report. Operating results for the three and six month periods ended June 30, 1999 are not necessarily indicative of the results that may be expected for the full year. Southwest Oil & Gas Income Fund X-C, L.P. Balance Sheets June 30, December 31, 1999 1998 --------- ------------ (unaudited) Assets Current assets: Cash and cash equivalents $ 18,419 22,818 Receivable from Managing General Partner 50,064 57,902 Distribution receivable 11 92 --------- --------- Total current assets 68,494 80,812 --------- --------- Oil and gas properties - using the full cost method of accounting 2,375,703 2,393,639 Less accumulated depreciation, depletion and amortization 2,029,496 1,995,496 --------- --------- Net oil and gas properties 346,207 398,143 --------- --------- $ 414,701 478,955 ========= ========= Liabilities and Partners' Equity Partners' equity: General partners $ (16,890) (15,686) Limited partners 431,591 494,641 --------- --------- Total partners' equity 414,701 478,955 --------- --------- $ 414,701 478,955 ========= ========= Southwest Oil & Gas Income Fund X-C, L.P. Statements of Operations (unaudited) Three Months Ended Six Months Ended June 30, June 30, 1999 1998 1999 1998 Revenues Oil and gas $ 169,301 168,362 288,601 370,523 Interest 237 397 452 831 ------- ------- ------- ------- 169,538 168,759 289,053 371,354 ------- ------- ------- ------- Expenses Production 149,561 131,472 273,785 290,576 General and administrative 11,249 12,340 22,319 29,400 Depreciation, depletion and amortization 13,000 31,000 34,000 59,000 ------- ------- ------- ------- 173,810 174,812 330,104 378,976 ------- ------- ------- ------- Net income (loss) $ (4,272) (6,053) (41,051) (7,622) ======= ======= ======= ======= Net income (loss) allocated to: Managing General Partner $ 786 2,245 (635) 4,624 ======= ======= ======= ======= General Partner $ 87 250 (70) 514 ======= ======= ======= ======= Limited Partners $ (5,145) (8,548) (40,346) (12,760) ======= ======= ======= ======= Per limited partner unit $ (.82) (1.37) (6.46) (2.04) ======= ======= ======= ======= Southwest Oil & Gas Income Fund X-C, L.P. Statements of Cash Flows (unaudited) Six Months Ended June 30, 1999 1998 Cash flows from operating activities: Cash received from sale of oil and gas $ 274,202 454,363 Cash paid to suppliers (273,867) (333,908) Interest received 452 831 ------- ------- Net cash provided by operating activities 787 121,286 ------- ------- Cash flows from investing activities: Additions to oil and gas properties (707) (4,089) Cash received from sale of oil and gas properties 18,643 1,700 ------- ------- Net cash provided by (used in) investing activities: 17,936 (2,389) ------- ------- Cash flows used in financing activities: Distributions to partners (23,122) (120,909) ------- ------- Net decrease in cash and cash equivalents (4,399) (2,012) Beginning of period 22,818 9,123 ------- ------- End of period $ 18,419 7,111 ======= ======= (continued) Southwest Oil & Gas Income Fund X-C, L.P. Statements of Cash Flows, continued (unaudited) Six Months Ended June 30, 1999 1998 Reconciliation of net income (loss) to net cash provided by operating activities: Net income (loss) $ (41,051) (7,622) Adjustments to reconcile net income (loss) to net cash provided by operating activities: Depreciation, depletion and amortization 34,000 59,000 Decrease (increase) in receivables (14,399) 83,840 Increase (decrease) in payables 22,237 (13,932) ------- ------- Net cash provided by operating activities $ 787 121,286 ======= ======= Southwest Oil & Gas Income Fund X-C, L.P. (a Delaware limited partnership) Notes to Financial Statements 1. Organization Southwest Oil & Gas Income Fund X-C, L.P. was organized under the laws of the state of Delaware on September 20, 1991, for the purpose of acquiring producing oil and gas properties and to produce and market crude oil and natural gas produced from such properties for a term of 50 years, unless terminated at an earlier date as provided for in the Partnership Agreement. The Partnership sells its oil and gas production to several purchasers with the prices it receives being dependent upon the oil and gas economy. Southwest Royalties, Inc. serves as the Managing General Partner and H. H. Wommack, III, as the individual general partner. Revenues, costs and expenses are allocated as follows: Limited General Partners Partners -------- -------- Interest income on capital contributions 100% - Oil and gas sales 90% 10% All other revenues 90% 10% Organization and offering costs (1) 100% - Syndication costs 100% - Amortization of organization costs 100% - Property acquisition costs 100% - Gain/loss on property disposition 90% 10% Operating and administrative costs (2) 90% 10% Depreciation, depletion and amortization of oil and gas properties 100% - All other costs 90% 10% (1) All organization costs in excess of 3% of initial capital contributions will be paid by the Managing General Partner and will be treated as a capital contribution. The Partnership paid the Managing General Partner an amount equal to 3% of initial capital contributions for such organization costs. (2) Administrative costs in any year which exceed 2% of capital contributions shall be paid by the Managing General Partner and will be treated as a capital contribution. 2. Summary of Significant Accounting Policies The interim financial information as of June 30, 1999, and for the three and six months ended June 30, 1999, is unaudited. Certain information and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles have been condensed or omitted in this Form 10-Q pursuant to the rules and regulations of the Securities and Exchange Commission. However, in the opinion of management, these interim financial statements include all the necessary adjustments to fairly present the results of the interim periods and all such adjustments are of a normal recurring nature. The interim consolidated financial statements should be read in conjunction with the audited financial statements for the year ended December 31, 1998. Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations General Southwest Oil & Gas Income Fund X-C, L.P. was organized as a Delaware limited partnership on September 20, 1991. The offering of such limited partnership interests began October 1, 1991 as part of a shelf offering registered under the name Southwest Oil & Gas 1990-91 Income Program. Minimum capital requirements for the Partnership were met on January 13, 1992 and the offering concluded on April 30, 1992 with total limited partner contributions of $3,123,000. The Partnership was formed to acquire interests in producing oil and gas properties, to produce and market crude oil and natural gas produced from such properties, and to distribute the net proceeds from operations to the limited and general partners. Net revenues from producing oil and gas properties will not be reinvested in other revenue producing assets except to the extent that production facilities and wells are improved or reworked or where methods are employed to improve or enable more efficient recovery of oil and gas reserves. Increases or decreases in Partnership revenues and, therefore, distributions to partners will depend primarily on changes in the prices received for production, changes in volumes of production sold, lease operating expenses, enhanced recovery projects, offset drilling activities pursuant to farmout arrangements, sales of properties, and the depletion of wells. Since wells deplete over time, production can generally be expected to decline from year to year. Well operating costs and general and administrative costs usually decrease with production declines; however, these costs may not decrease proportionately. Net income available for distribution to the partners is therefore expected to fluctuate in later years based on these factors. Based on current conditions, management does not anticipate performing workovers in 1999. The Partnership could possibly experience a low decline. Oil and Gas Properties Oil and gas properties are accounted for at cost under the full-cost method. Under this method, all productive and nonproductive costs incurred in connection with the acquisition, exploration and development of oil and gas reserves are capitalized. Gain or loss on the sale of oil and gas properties is not recognized unless significant oil and gas reserves are involved. The Partnership's policy for depreciation, depletion and amortization of oil and gas properties is computed under the units of revenue method. Under the units of revenue method, depreciation, depletion and amortization is computed on the basis of current gross revenues from production in relation to future gross revenues, based on current prices, from estimated production of proved oil and gas reserves. Should the net capitalized costs exceed the estimated present value of oil and gas reserves, discounted at 10%, such excess costs would be charged to current expense. As of June 30, 1999, the net capitalized costs did not exceed the estimated present value of the oil and gas reserves. The oil price environment experienced during 1998 had an adverse affect on the Company's revenues and operating cash flow. Further declines of oil prices during 1999 could result in additional decreases in the carrying value of the Company's oil and gas properties. Results of Operations A. General Comparison of the Quarters Ended June 30, 1999 and 1998 The following table provides certain information regarding performance factors for the quarters ended June 30, 1999 and 1998: Three Months Ended Percentage June 30, Increase 1999 1998 (Decrease) ---- ---- ---------- Average price per barrel of oil $ 15.02 11.28 33% Average price per mcf of gas $ 1.79 1.62 10% Oil production in barrels 8,800 11,200 (21%) Gas production in mcf 20,800 25,900 (20%) Gross oil and gas revenue $ 169,301 168,362 1% Net oil and gas revenue $ 19,740 36,890 (46%) Partnership distributions $ 23,204 36,000 (36%) Limited partner distributions $ 22,704 32,400 (30%) Per unit distribution to limited partners $ 3.63 5.19 (30%) Number of limited partner units 6,246 6,246 Revenues The Partnership's oil and gas revenues increased to $169,301 from $168,362 for the quarters ended June 30, 1999 and 1998, respectively, an increase of 1%. The principal factors affecting the comparison of the quarters ended June 30, 1999 and 1998 are as follows: 1. The average price for a barrel of oil received by the Partnership increased during the quarter ended June 30, 1999 as compared to the quarter ended June 30, 1998 by 33%, or $3.74 per barrel, resulting in an increase of approximately $41,900 in revenues. Oil sales represented 78% of total oil and gas sales during the quarter ended June 30, 1999 as compared to 75% during the quarter ended June 30, 1998. The average price for an mcf of gas received by the Partnership increased during the same period by 10%, or $.17 per mcf, resulting in an increase of approximately $4,400 in revenues. The total increase in revenues due to the change in prices received from oil and gas production is approximately $46,300. The market price for oil and gas has been extremely volatile over the past decade, and management expects a certain amount of volatility to continue in the foreseeable future. 2. Oil production decreased approximately 2,400 barrels or 21% during the quarter ended June 30, 1999 as compared to the quarter ended June 30, 1998, resulting in a decrease of approximately $36,000 in revenues. Gas production decreased approximately 5,100 mcf or 20% during the same period, resulting in a decrease of approximately $9,100 in revenues. The total decrease in revenues due to the change in production is approximately $45,100. The decrease in oil and gas production was due primarily to property sales, mechanical downtime in one gas well and natural decline. Costs and Expenses Total costs and expenses decreased to $173,810 from $174,812 for the quarters ended June 30, 1999 and 1998, respectively, a decrease of 1%. The decrease is the result of lower general and administrative and depletion expense, partially offset by an increase in lease operating expense. 1. Lease operating costs and production taxes were 14% higher, or approximately $18,100 more during the quarter ended June 30, 1999 as compared to the quarter ended June 30, 1998. 2. General and administrative costs consist of independent accounting and engineering fees, computer services, postage, and Managing General Partner personnel costs. General and administrative costs decreased 9% or approximately $1,100 during the quarter ended June 30, 1999 as compared to the quarter ended June 30, 1998. 3. Depletion expense decreased to $13,000 for the quarter ended June 30, 1999 from $31,000 for the same period in 1998. This represents a decrease of 58%. Depletion is calculated using the units of revenue method of amortization based on a percentage of current period gross revenues to total future gross oil and gas revenues, as estimated by the Partnership's independent petroleum consultants. Contributing factors to the decline in depletion expense between the comparative periods were the increase in the price of oil and gas used to determine the Partnership's reserves for April 1, 1999 as compared to 1998 and the decrease in gross oil and gas revenues. B. General Comparison of the Six Month Periods Ended June 30, 1999 and 1998 The following table provides certain information regarding performance factors for the six month periods ended June 30, 1999 and 1998: Six Months Ended Percentage June 30, Increase 1999 1998 (Decrease) ---- ---- ---------- Average price per barrel of oil $ 12.17 11.66 4% Average price per mcf of gas $ 1.69 1.96 (14%) Oil production in barrels 18,000 22,500 (20%) Gas production in mcf 41,000 55,200 (26%) Gross oil and gas revenue $ 288,601 370,523 (22%) Net oil and gas revenue $ 14,816 79,947 (81%) Partnership distributions $ 23,204 121,000 (81%) Limited partner distributions $ 22,704 108,900 (79%) Per unit distribution to limited partners $ 3.63 17.44 (79%) Number of limited partner units 6,246 6,246 Revenues The Partnership's oil and gas revenues decreased to $288,601 from $370,523 for the six months ended June 30, 1999 and 1998, respectively, a decrease of 22%. The principal factors affecting the comparison of the six months ended June 30, 1999 and 1998 are as follows: 1. The average price for a barrel of oil received by the Partnership increased during the six months ended June 30, 1999 as compared to the six months ended June 30, 1998 by 4%, or $.51 per barrel, resulting in an increase of approximately $11,500 in revenues. Oil sales represented 76% of total oil and gas sales during the six months ended June 30, 1999 as compared to 71% during the six months ended June 30, 1998. The average price for an mcf of gas received by the Partnership decreased during the same period by 14%, or $.27 per mcf, resulting in a decrease of approximately $14,900 in revenues. The net total decrease in revenues due to the change in prices received from oil and gas production is approximately $3,400. The market price for oil and gas has been extremely volatile over the past decade, and management expects a certain amount of volatility to continue in the foreseeable future. 2. Oil production decreased approximately 4,500 barrels or 20% during the six months ended June 30, 1999 as compared to the six months ended June 30, 1998, resulting in a decrease of approximately $54,800 in revenues. Gas production decreased approximately 14,200 mcf or 26% during the same period, resulting in a decrease of approximately $24,000 in revenues. The total decrease in revenues due to the change in production is approximately $78,800. The decrease in oil and gas production was due primarily to property sales, mechanical downtime in one gas well and natural decline. Costs and Expenses Total costs and expenses decreased to $330,104 from $378,976 for the six months ended June 30, 1999 and 1998, respectively, a decrease of 13%. The decrease is the result of a decline in lease operating costs, general and administrative expense and depletion expense. 1. Lease operating costs and production taxes were 6% lower, or approximately $16,800 less during the six months ended June 30, 1999 as compared to the six months ended June 30, 1998. 2. General and administrative costs consist of independent accounting and engineering fees, computer services, postage, and Managing General Partner personnel costs. General and administrative costs decreased 24% or approximately $7,100 during the six months ended June 30, 1999 as compared to the six months ended June 30, 1998. The decrease of general and administrative costs were in part due to additional accounting costs incurred in 1998 in relation to the outsourcing of K-1 tax package preparation; a change in auditors requiring opinions from both the predecessors and successor auditors and a new accounting pronouncement requiring review by the independent auditors of the 10- Q's. The Managing General Partner has also made an effort to cut back on general and administrative costs whenever and wherever possible. 3. Depletion expense decreased to $34,000 for the six months ended June 30, 1999 from $59,000 for the same period in 1998. This represents a decrease of 42%. Depletion is calculated using the units of revenue method of amortization based on a percentage of current period gross revenues to total future gross oil and gas revenues, as estimated by the Partnership's independent petroleum consultants. Contributing factors to the decline in depletion expense between the comparative periods were the increase in the price of oil and gas used to determine the Partnership's reserves for April 1, 1999 as compared to 1998 and the decrease in gross oil and gas revenues. Liquidity and Capital Resources The primary source of cash is from operations, the receipt of income from interests in oil and gas properties. The Partnership knows of no material change, nor does it anticipate any such change. Cash flows provided by operating activities were approximately $800 in the six months ended June 30, 1999 as compared to approximately $121,200 in the six months ended June 30, 1998. The primary source of the 1999 cash flow from operating activities was profitable operations. Cash flows provided by (used in) investing activities were approximately $17,900 in the six months ended June 30, 1999 as compared to approximately $(2,400) in the six months ended June 30, 1998. The principle source of the 1999 cash flow from investing activities was the sale of oil and gas properties. Cash flows used in financing activities were approximately $23,100 in the six months ended June 30, 1999 as compared to approximately $121,000 in the six months ended June 30, 1998. The only use in financing activities was the distributions to partners. Total distributions during the six months ended June 30, 1999 were $23,204 of which $22,704 was distributed to the limited partners and $500 to the general partners. The per unit distribution to limited partners during the six months ended June 30, 1999 was $3.63. Total distributions during the six months ended June 30, 1998 were $121,000 of which $108,900 was distributed to the limited partners and $12,100 to the general partners. The per unit distribution to limited partners during the six months ended June 30, 1998 was $17.44. The source for the 1999 distributions of $23,204 was oil and gas operations of approximately $800, and the net change in oil and gas properties of approximately $17,900, with the balance from available cash on hand at the beginning of the period. The source for the 1998 distributions of $121,000 was oil and gas operations of approximately $121,200. Since inception of the Partnership, cumulative monthly cash distributions of $2,947,022 have been made to the partners. As of June 30, 1999, $2,671,148 or $427.66 per limited partner unit has been distributed to the limited partners, representing a 86% return of the capital contributed. As of June 30, 1999, the Partnership had approximately $68,500 in working capital. The Managing General Partner knows of no unusual contractual commitments and believes the revenues generated from operations are adequate to meet the needs of the Partnership. Liquidity - Managing General Partner The Managing General Partner has a highly leveraged capital structure with over $21.0 million of interest payments due in 1999 on its debt obligations. Due to severely depressed commodity prices, the Managing General Partner is experiencing difficulty in generating sufficient cash flow to meet its obligations and sustain its operations. The Managing General Partner is currently in the process of renegotiating the terms of its various obligations with its creditors and/or attempting to seek new lenders or equity investors. Additionally, the Managing General Partner would consider disposing of certain assets in order to meet its obligations. There can be no assurance that the Managing General Partner's debt restructuring efforts will be successful or that the lenders will agree to a course of action consistent with the Managing General Partners requirements in restructuring the obligations. Even if such agreement is reached, it may require approval of additional lenders, which is not assured. Furthermore, there can be no assurance that the sales of assets can be successfully accomplished on terms acceptable to the Managing General Partner. Under current circumstances, the Managing General Partner's ability to continue as a going concern depends upon its ability to (1) successfully restructure its obligations or obtain additional financing as may be required, (2) maintain compliance with all debt covenants, (3) generate sufficient cash flow to meet its obligations on a timely basis, and (4) achieve satisfactory levels of future earnings. If the Managing General Partner is unsuccessful in its efforts, it may be unable to meet its obligations making it necessary to undertake such other actions as may be appropriate to preserve asset values. Information Systems for the Year 2000 The Managing General Partner provides all data processing needs of the Partnership. The Managing General Partner is continuing in its effort to identify and assess its exposure to the potential Year 2000 software and imbedded chip processing and date sensitivity issue. Through the Managing General Partners data processing subsidiary, Midland Southwest Software, Inc., the Managing General Partner proactively initiated a plan to identify applicable hardware and software, assess impact and effect, estimate costs, construct and implement corrective actions, and prepare contingency plans. Identification & Assessment The Managing General Partner currently believes it has identified the internal and external software and hardware that may have date sensitivity problems. Four critical systems and/or functions were identified: (1) the proprietary software of the Partnership (OGAS) that is used for oil & gas property management and financial accounting functions, (2) the DEC VAX/VMS hardware and operating system, (3) various third-party application software including lease economic analysis, fixed asset management, geological applications, and payroll/human resource programs, and (4) External Agents. The proprietary software of the Partnership is currently in process of meeting compliance requirements with an estimated completion date of mid- year 1999. Since this is an internally generated software package, the Managing General Partner has estimated the cost to be approximately $25,000 by estimating the necessary man-hours. These modifications are being made by internal staff and do not represent additional costs to the Partnership. The Managing General Partner has not made contingency plans at this time since the conversion is ahead of schedule and being handled by Managing General Partner controlled internal programmers. Given the complexity of the systems being modified, it is anticipated that some problems may arise, but with an expected early completion date, the Managing General Partner feels that adequate time is available to overcome unforeseen delays. DEC has released a fully compliant version of its operating system that is used by the Partnership on the DEC VAX system. It will be installed in August 1999, the Managing General Partner believes that this will solve any potential problems on the system. The Managing General Partner has identified various third-party software that may have date sensitivity problems and is working with the vendors to secure solutions as well as prepare contingency plans. After review and evaluation of the vendor plans and status, the Managing General Partner believes that the problems will be resolved prior to the year 2000 or the alternate contingency plan will sufficiently and adequately remediate the problem so that there is no material disruption to business functions. The External Agents of the Partnership include suppliers, customers, owners, vendors, banks, product purchasers including pipelines, and other oil and gas property operators. The Managing General Partner is in the process of identifying and communicating with each critical External Agent about its plan and progress thereof in addressing the Year 2000 issue. This process is on schedule and the Managing General Partner, at this time, believes that there should be no material interference or disruption associated with any of the critical External Agent's functions necessary to the Partnership's business. The Managing General Partner estimates completion of this audit by mid-year 1999 and believes that alternate plans can be devised to circumvent any material problems arising from critical External Agent noncompliance. Cost To date, the Managing General Partner has incurred only minimal internal man-hour costs for identification, planning, and maintenance. The Managing General Partner believes that the necessary additional costs will also be minimal and most will fall under normal and general maintenance procedures and updates. An accurate cost cannot be determined at this time, but it is expected that the total cost to remediate all systems to be less than $50,000. Risks/Contingency The failure to correct critical systems of the Partnership, or the failure of a material business partner or External Agent to resolve critical Year 2000 issues could have a serious adverse impact on the ability of the Partnership to continue operations and meet obligations. Based on the Managing General Partner's evaluation and assessment to date, it is believed that any interruption in operation will be minor and short-lived and pose no material monetary loss, safety, or environmental risk to the Partnership. However, until all assessment is complete, it is impossible to accurately identify the risks, quantify potential impacts or establish a final contingency plan. The Managing General Partner believes that its assessment and contingency planning will be complete no later than mid-year 1999. Worst Case Scenario The Securities and Exchange Commission requires that public companies must forecast the most reasonably likely worst case Year 2000 scenario, assuming that the Managing General Partner's Year 2000 plan is not effective. Analysis of the most reasonably likely worst case Year 2000 scenarios the Partnership may face leads to contemplation of the following possibilities which, though considered highly unlikely, must be included in any consideration of worst cases: widespread failure of electrical, gas, and similar supplies by utilities serving the Partnership; widespread disruption of the services of communications common carriers; similar disruption to means and modes of transportation for the Partnership and its employees, contractors, suppliers, and customers; significant disruption to the Partnership's ability to gain access to, and continue working in, office buildings and other facilities; and the failure, of third-parties systems, the effects of which would have a cumulative material adverse impact on the Partnership's critical systems. The Partnership could experience an inability by customers, traders, and others to pay, on a timely basis or at all, obligations owed to the Partnership. Under these circumstances, the adverse effect on the Partnership, and the diminution of Partnership revenues, could be material, although not quantifiable at this time. PART II. - OTHER INFORMATION Item 1. Legal Proceedings None Item 2. Changes in Securities None Item 3. Defaults Upon Senior Securities None Item 4. Submission of Matter to a Vote of Security Holders None Item 5. Other Information None Item 6. Exhibits and Reports on Form 8-K (a) Exhibits: 27 Financial Data Schedule (b) Reports on Form 8-K: No reports on Form 8-K were filed during the quarter ended June 30, 1999. SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. SOUTHWEST OIL & GAS INCOME FUND X-C, L.P. a Delaware limited partnership By: Southwest Royalties, Inc. Managing General Partner By: /s/ Bill E. Coggin Bill E. Coggin, Vice President and Chief Financial Officer Date: August 15, 1999