1. General

The unaudited condensed financial statements have been prepared on the same basis as the annual audited financial statements and, in the opinion of management, reflect all adjustments necessary for a fair presentation for each of the periods presented. The results of operations for interim periods are not necessarily indicative of results to be achieved for full fiscal years or other interim periods.

Inogen, Inc. (Company or Inogen) was incorporated in Delaware on November 27, 2001. The Company is a medical technology company that develops, manufactures and markets innovative portable oxygen concentrators used for supplemental long-term oxygen therapy by patients with chronic obstructive pulmonary disease, or COPD, and other chronic respiratory conditions. The Company’s proprietary Inogen One systems are designed to address the quality-of-life and other shortcomings of the traditional oxygen therapy model, which Inogen calls the delivery model. Traditionally, oxygen therapy patients have relied upon stationary oxygen concentrator systems in the home in conjunction with regular deliveries of oxygen tanks or cylinders for ambulatory, or mobile, use, limiting their mobility and requiring them to plan activities outside of their homes around delivery schedules and a finite oxygen supply. The Company’s Inogens One systems concentrate the air around them to offer a single source of supplemental oxygen anytime, anywhere in devices weighing approximately five to seven pounds.  Inogen’s products eliminate the need for oxygen deliveries, as well as regular use of a stationary concentrator, thereby improving patient quality-of-life and fostering patient mobility.

As contemplated by the Securities and Exchange Commission (SEC) under Rule 10-01 of Regulation S-X, the accompanying financial statements and related footnotes have been condensed and do not contain certain information that will be included in the Company’s annual financial statements and footnotes thereto. For further information refer to the financial statements and related footnotes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2013 filed with the SEC on April 1, 2014 (Annual Report).

The preparation of the Company’s condensed financial statements in accordance with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the amounts reported in these condensed financial statements and accompanying notes. Management bases these estimates and assumptions upon historical experience, existing and known circumstances, authoritative accounting pronouncements and other factors that management believes to be reasonable. Significant areas requiring the use of management estimates relate to inventory and rental asset valuations and write-downs, accounts receivable reserves and allowance for bad debts, returns and adjustments, stock compensation expense, impairment assessments, depreciation and amortization, income tax provision and uncertain tax positions, fair value of financial instruments, and fair values of acquired intangibles.  Actual results could differ materially from these estimates.

Certain reclassifications have been made to prior years to conform to current period financial statement presentation with no effect on previously reported financial position, results of operations or cash flows.

The Company completed an initial public offering on February 20, 2014, and sold 3,529,411 shares to the public for $16.00 per share.  In addition, to this offering the selling shareholders sold 982,302 shares for a combined total of 4,511,713 actively trading upon the completion of the offering.  The Company netted approximately $49,668 after the underwriters discount and other associated expenses.  The Company’s outstanding redeemable convertible preferred stock and non-redeemable preferred stock were all converted to common stock.  As of March 31, 2014, the Company had 18,151,551 shares of common stock outstanding.