EXHIBIT 99.1 BioSource Reports Strong First Quarter Results; Attains Record Sales in the First Quarter CAMARILLO, Calif.--(BUSINESS WIRE)--April 25, 2005--BioSource International, Inc. (Nasdaq:BIOI) today announced financial results for its first quarter ended March 31, 2005. For the first quarter ended March 31, 2005, the Company reported record net sales from continuing operations of $12.8 million, an 11% increase as compared with $11.5 million for the first quarter of 2004. Foreign exchange rates favorably impacted sales in the first quarter of 2005 by $0.3 million. Income from continuing operations was $1.1 million representing a 14% increase compared with $1.0 million in the first quarter of 2004. Terrance J. Bieker, President and CEO, stated, "This was a strong quarter for BioSource. We are pleased by the record first quarter sales and the improvement in income from continuing operations." Mr. Bieker continued, "We believe these results reinforce the strategy we have pursued over the past year and are confident in our ability to continue to deliver increased value to our customers and stockholders." First Quarter Review Sales of the Company's cellular pathway assay products increased 15% on a sequential basis for the first quarter ended March 31, 2005 compared to the prior quarter ended December 31, 2004. Biological and other product sales increased 18% on a sequential basis during the first quarter of 2005 compared to the fourth quarter of 2004. The gross margin from continuing operations was 57.4% in the first quarter of 2005 compared to 58.4% in the comparable quarter of the prior year. The decrease was primarily due to a change in the product mix. Operating expenses from continuing operations in the first quarter were as follows: -- Research and development expenses were $1.5 million, or 11.9% of sales, in the first quarter of 2005 which was relatively consistent with such costs in the first quarter of 2004 of $1.4 million, or 12.0% of sales. -- In the first quarter of 2005, sales and marketing expenses decreased to 19.8% of sales as compared to 20.3% in the first quarter of 2004 which was consistent with management's plan to increase such costs at a slower rate than sales growth. -- General and administrative expenses also decreased as a percentage of sales to 15.9% in the first quarter of 2005 from 16.4% of sales in the comparable quarter of 2004. -- The Company's effective tax rate was 35.8% in the first quarter of 2005 compared to 22.4% in the first quarter of 2004. At March 31, 2005, the Company's cash and cash equivalents totaled $5.2 million. Forward-Looking Guidance for 2005 The Company raised its operating income guidance to reflect the strength of its results in the first quarter. The Company's 2005 guidance is: -- Net sales from continuing operations of $49 million to $51 million, or year-over-year growth of 10% to 15%. This is a reaffirmation of earlier guidance. -- Operating income from continuing operations of $2.5 million to $3.25 million, or year-over-year growth of 240% to 350%. Prior guidance was for operating income growth of 175% to 315% or $2.0 million to $3.0 million. As previously announced, a live webcast of BioSource International, Inc.'s financial results conference call will be available over the Internet through its Web site at www.biosource.com in the Investor Relations section beginning today, April 25, at 9:00 a.m. PDT. A replay of the webcast will be available at the same site for a two week period beginning shortly after the call. Event archives are normally available one to two hours after the event ends. For the live event, listeners should go to the Web site at least fifteen minutes before the event starts to download and install any necessary audio software. About BioSource International, Inc. BioSource International, Inc. is a broad-based life sciences company focused on providing integrated solutions in the areas of functional genomics, proteomics, and drug discovery through the development, manufacturing, marketing and distribution of unique, biologically active reagent systems which facilitate, enable and accelerate pharmaceutical development and biomedical research. For more information, please visit the Company's Web site at www.biosource.com. Statements included in this release that are not historical facts may be considered forward-looking statements that are subject to a variety of risks and uncertainties. In addition, readers are urged to consider statements that include the terms "believes," "belief," "expects," "plans," "objectives," "anticipates," "intends," "targets," "projections," or the like to be uncertain and forward looking. For these statements, we claim the safe harbor for "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. Factors that could cause actual results to differ and vary materially from the forward-looking statements made herein include, among others, our ability to expand our product offerings and any transition to new products, product quality and availability, any change in business conditions, changes in our sales strategy and product development plans, competitive pricing pressures, continued market acceptance of our products, name recognition of our products, delays in the development of new technology, possible invalidity or infringement issues related to intellectual property or proprietary rights, changes in customer buying patterns, one-time events, the effects of our previously announced process to evaluate strategic alternatives, including a possible sale of the Company, and any transaction we may enter into in connection with that process, and other important factors disclosed previously and from time to time in our filings with the Securities and Exchange Commission. These factors should not be construed as exhaustive. We cannot always predict or determine after the fact what factors would cause actual results to differ materially from those indicated by the forward-looking statements or other statements. We do not undertake any obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future event, or otherwise. BIOSOURCE INTERNATIONAL, INC. Condensed Consolidated Statements of Operations (Amounts in thousands, except per share data) Three Months Ended March 31, 2005 2004 (Unaudited) Net sales 12,758 11,532 Cost of goods sold 5,431 4,802 Gross profit 7,327 6,730 Operating expenses: Research and development 1,517 1,385 Sales and marketing 2,528 2,339 General and administrative 2,033 1,891 Amortization of intangibles 139 139 Total operating expenses 6,217 5,754 Income from continuing operations 1,110 976 Interest and other income (expense), net (34) (15) Income from continuing operations before provision for income taxes and discontinued operations 1,076 961 Provision for income taxes 385 215 Net income from continuing operations 691 746 Discontinued operations, net - (38) Net income 691 708 Basic income per share: Income from continuing operations 0.08 0.08 Discontinued operations, net - - Basic income per share 0.08 0.08 Diluted income per share: Income from continuing operations 0.07 0.08 Discontinued operations, net - (0.01) Diluted income per share 0.07 0.07 Shares used in per share calculations: Basic 9,087 9,395 Diluted 9,226 9,752 BIOSOURCE INTERNATIONAL, INC. Condensed Consolidated Balance Sheets (Unaudited) (in thousands) March 31, December 31, 2005 2004 Assets Current assets Cash and cash equivalents $ 5,176 $ 4,210 Accounts receivable, net 8,064 7,165 Inventories, net 7,483 7,535 Notes receivable - 544 Deferred income taxes 1,947 1,947 Other current assets 1,220 941 Total current assets 23,890 22,342 Property and equipment, net 4,932 5,241 Intangible assets, net 5,115 5,253 Deferred income taxes 9,616 9,865 Other assets 700 651 Total assets $44,253 $43,352 Liabilities and Stockholders' Equity Current liabilities Accounts payable and accrued expenses $ 6,850 $ 6,249 Other current liabilities 715 872 Total current liabilities 7,565 7,121 Stockholders' equity 36,688 36,231 Total liabilities and stockholders' equity $44,253 $43,352 CONTACT: BioSource International, Inc. Alan Edrick, (805) 383-5249