Thank you, operator, and welcome to our first quarter of 2024 report. On this call, we will cover business highlights and financial performance for the 3-month period ending March 31, 2024, and will provide financial guidance for the year. Joining us on the call today are Repligen's CEO, Tony Hunt; our CFO, Jason Garland; and our Chief Commercial Officer, Olivier Loeillot.
As a reminder, the forward-looking statements that we make during this call, including those regarding our business goals and expectations for the financial performance of the company are subject to risks and uncertainties that may cause actual events or results to differ. Additional information concerning risks related to our business is included in our quarterly reports on Form 10-Q, our annual report on Form 10-K and our current report on Form 8-K, including the report that we are filing today, and other filings that we make with the SEC. Today's comments reflect management's current views, which could change as a result of new information, future events or otherwise. The company does not obligate or commit itself to update forward-looking statements, except as required by law.
During this call, we are providing non-GAAP financial results and guidance, unless otherwise noted. Reconciliations of GAAP to non-GAAP financial measures are included in the press release that we issued this morning, which is posted to Repligen's website and on sec.gov. Adjusted non-GAAP figures in today's report include the following: book-to-bill ratio, organic revenue growth, base business revenue, which excludes COVID and M&A, non-COVID revenue, cost of sales, gross profit and gross margin; operating expenses, including R&D and SG&A, income from operations and operating margin, other income, pretax income, effective tax rate, net income, diluted earnings per share as well as EBITDA, adjusted EBITDA and adjusted EBITDA margins. These adjusted financial measures should not be viewed as an alternative to GAAP measures but are intended to best reflect the performance of our ongoing operations.
Now let me turn the call over to Tony Hunt.