Ilan Daskal
Executive Vice President, Chief Financial Officer at Bio-Rad Laboratories
Thank you, Andy. Now, I would like to review the results of the third quarter. Net sales for the third quarter of 2023 was $632.1 million, which is a decline of 7.1% on a reported basis versus $680.8 million in Q3 of 2022 and 7.9% decline on a currency-neutral basis. The third quarter year-over-year revenue decline was primarily the result of ongoing weakness in the biopharma end-markets impacting the sales of our life science tools and bioprocessing products.
In addition, we experienced weaker demand in China as a result of the macroeconomic environment as well as the local Made in China initiatives. COVID-related sales in Q3 were $300,000 versus about $17.2 million in Q3 last year. Core revenue, which excludes COVID-related sales decreased 5.5% on a currency-neutral basis. On a geographic basis, currency-neutral year-over-year core revenue decreased in Asia and Europe, partially offset by increased sales in the Americas. Sales of the Life Science Group in the third quarter of 2023 were $263.5 million compared to $317.9 million in Q3 of 2022, which is a decline of 17.1% on a reported basis and a 17.8% decline on a currency-neutral basis. Excluding COVID-related sales, the Life Science Group year-over-year currency-neutral core revenue decreased 13.7% and was primarily driven by lower sales of qPCR, process chromatography, western blotting products, and about flat year-over-year ddPCR revenue.
Excluding process chromatography sales, the underlying Life Science business decreased 16.7% on a currency-neutral basis versus Q3 of 2022. The Life Science Group revenue excluding process chromatography and COVID-related sales decreased 11.6% on a currency-neutral basis. On a geographic basis, Life Science year-over-year core revenue decreased in Asia and Europe, partially offset by a modest increase in sales in the Americas. Sales of the Clinical Diagnostics Group in the third quarter were $368.1 million compared to $361.9 million in Q3 of 2022, a growth of 1.7% on a reported basis and a 1% growth on a currency-neutral basis.
Core Clinical Diagnostics year-over-year revenue which excludes COVID-related sales increased 1.4% on a currency-neutral basis. Growth of the Clinical Diagnostics Group was primarily driven by blood typing in diabetes products, as well as growth from our quality controls portfolio. On a geographic basis, the Diagnostics Group posted currency-neutral year-over-year core revenue growth in the Americas and Europe partially offset by the decline in Asia. The reported gross margin for the third quarter of 2023 was 53.1% on a GAAP basis and compares to 54.7% in Q3 of 2022. The year-over-year gross margin decline was mainly due to unfavorable product mix, lower manufacturing volumes, higher material costs, and inventory reserves, and was partially offset by improved logistics costs.
Amortization related to prior acquisitions recorded in cost of goods sold was $4.5 million compared to $4.4 million in Q3 of 2022. Third quarter operating expenses benefited from our cost-cutting initiatives, as well as a contingent consideration benefit of $18.9 million from last year's acquisition of Curiosity Diagnostics. SG&A expenses for Q3 of 2023 were $201.2 million or 31.8% of sales compared to $211.1 million or 31% in Q3 of 2022. The lower SG&A in the quarter included $4.1 million in contingent consideration benefits that I mentioned earlier, as well as lower employee-related expenses.
Total amortization expense related to acquisitions recorded in SG&A for the quarter was $1.6 million versus $1.8 million in Q3 of 2022. Research and development expense in the third quarter was $43.5 million or 6.9% of sales compared to $66.8 million or 9.8% of sales in Q3 of 2022. This significantly lower R&D expenses recorded in the third quarter included $14.8 million in contingent consideration benefit that I mentioned earlier, as well as lower project and employee-related expenses. Q3 operating income was $90.9 million or 14.4% of sales. Compared to $94.6 million or 13.9% of sales in Q3 of 2022.
Looking below the operating line, the change in fair market value of equity securities holdings, which are substantially related to Bio-Rad's ownership of Sartorius AG shares, added $36.4 million of income to the reported results. During the quarter, interest and other income resulted in net other income of $9.7 million compared to net other expense of $13 million last year, primarily driven by increased interest income from investments. The effective tax rate for the third quarter of 2023 was 22.5% compared to 21.5% in Q3 of last year. The effective tax rate this quarter was primarily affected by an unrealized gain in equity securities and the tax rate reported in Q3 of 2022 was primarily affected by an unrealized loss in equity securities. Reported net income for the third quarter was 106.3 million or $3.64 diluted earnings per share compared to a loss of 162.8 million or $5.48 diluted loss per share in Q3 of 2022. This change from last year is largely related to changes in the valuation of the Sartorius Group.
Moving on to the non-GAAP results. Looking at the results on a non-GAAP basis, we have excluded certain typical and unique items that impacted both the gross and operating margins, as well as other income. These items are detailed in the reconciliation tables in the press release. Looking at the non-GAAP results for the third quarter, in cost of goods sold, we have excluded $4.5 million of amortization of purchased intangibles, and a small restructuring expense. These exclusions moved the gross margin from 53.1% for the third quarter of 2023 to a non-GAAP gross margin of 53.9% versus 55.6% in Q3 of 2022.
Non-GAAP SG&A in the third quarter of 2023 was 31.7% versus 30% in Q3 of 2022. In SG&A, on a non-GAAP basis, we have excluded $4.1 million of an acquisition related to the contingent consideration benefit mentioned earlier and In Vitro Diagnostic registration fee in Europe for previously approved products of $1.9 million, amortization of purchased intangibles of $1.6 million and $1.3 million of restructuring-related expenses.
Non-GAAP R&D in the third quarter of 2023 was 9.2% versus 9.7% in Q3 of 2022. In R&D, on a non-GAAP basis, we have excluded $14.8 million of an acquisition related to the contingent consideration benefit mentioned earlier and a small restructuring benefit. The cumulative sum of these non-GAAP adjustments result in moving the quarterly operating margin from 14.4% on a GAAP basis to 12.9% on a non-GAAP basis. This non-GAAP operating margin compares to a non-GAAP operating margin of 15.8% in Q3 of 2022.
We have also excluded certain items below the operating line, which are the increase in value of the Sartorius equity securities and loan receivable holdings of $36.4 million, $2.5 million gain from the release of an escrow for an acquisition, and about $700,000 loss associated with venture investments.
The non-GAAP effective tax rate for the third quarter of 2023 was 23.9% compared to 21.7% for the same period in 2022. The higher rate in 2023 was driven by a geographical mix of earnings and reduced compensation-related deductions. We continue to estimate the full-year non-GAAP tax rate to be between 22% and 23%. And finally, non-GAAP net income for the third quarter of 2023 was $68.1 million or $2.33 diluted earnings per share, compared to $79.2 million or diluted earnings per share of $2.64 in Q3 of 2022.
Moving onto the balance sheet. During the third quarter, we purchased 58,478 shares of our stock at an average share price of $364.61 for a total cost of $21.3 million. We still have nearly $480 million remaining in our Board-authorized share repurchase program and plan to continue with our opportunistic approach to buybacks as part of our capital allocation strategy.
Total cash and short-term investments at the end of Q3 was $1.765 million compared to $1.728 million at the end of Q2 of 2023. The increase in cash and short-term investments from the second quarter was primarily due to changes in working capital. Inventory at the end of Q3 was $775.8 million, which is slightly lower than the inventory in the prior quarter.
For the third quarter of 2023, net cash generated from operating activities was $97.7 million, which compares to $11 million in Q3 of 2022. This increase mainly reflects changes in working capital and income tax payments. The adjusted EBITDA for the third quarter of 2023 was $112.7 million or 17.8% of sales. The adjusted EBITDA in Q3 of 2022 was $135.7 million or 19.9% of sales. Net capital expenditures for the third quarter of 2023 were $44 million, and depreciation and amortization for the third quarter was 37.3 million.
Moving on to the non-GAAP guidance. Given the current market environment, we are revising our 2023 financial outlook as follows. We now expect about a 3.5% currency-neutral year-over-year revenue decline in 2023 versus a growth of about 80 basis points previously. For the full year, we estimate currency-neutral year-over-year revenue growth excluding COVID-related sales to be between zero and 50 basis points versus about 4.5% in our prior guidance. Of the 400 basis points to 450 basis points core revenue breakdown, 250 basis points are related to the third quarter revenue shortfall, of which approximately 200 basis points is related to weakness in biopharma and the remaining 60 basis points is related to lower clinical diagnostic. The remaining 150 basis points to 200 basis points reduction is attributed to reduced process chromatography and other biopharma demand as well as continued softness in China.
For the Life Science Group, we expect a 12% currency-neutral revenue decline for 2023, and when excluding COVID-related sales, the Life Science Group currency-neutral revenue decline is projected to be between 4% and 5%. Excluding COVID and process chromatography-related sales Life Science Group revenue is expected to decline between 2% and 3%.
For the Diagnostics Group. While we remain encouraged with the overall demand we are now guiding core revenue growth to be about 4.5% versus 5.5% previously. Full-year non-GAAP gross margin is now projected to be about 54% versus about 54.5% previously reflecting our updated expectation of shift in product mix and volume. We now project a full-year non-GAAP operating margin to be about 14.5% versus approximately 16% in our prior guidance. As we continue to carefully manage discretionary expenses and full-year adjusted EBITDA margin is expected to be between 20% and 20.5% versus about 21.5% in our prior guidance.
And now I'll turn the call over to Norman for a few remarks. Norman?