S&M includes costs to execute our sales strategy, which includes personnel costs pertaining to our sales force and sales support functions, including salaries, commissions and other incentive compensation, commissions to sales agents, customer support, travel expenses, and bad debt expense.
S&M expense includes costs to execute our sales strategy, which includes personnel costs pertaining to our sales force and sales support functions, including salaries, commissions and other incentive compensation, commissions to sales agents, customer support, travel expenses, and bad debt expense.
Net sales Our net sales are derived from selling to a wide range of customers, including hospitals, wound care centers and private physician offices that have clinicians using our suite of products to aid in the management of patients with chronic or hard-to-heal wounds.
Net sales Our net sales are derived from selling our Wound and Surgical products to a wide range of customers, including hospitals, wound care centers and private physician offices that have clinicians using our suite of products to aid in the management of patients with chronic or hard-to-heal wounds.
We recognize revenue as performance obligations are fulfilled, which generally occurs upon the shipment of product to customers for ship and bill sales or upon implantation for consignment sales. We recognize revenue based on consideration we expect to receive from the sale.
We recognize revenue as performance obligations are fulfilled, which generally occurs upon the shipment of product to customers for ship and bill sales or upon implantation for consignment sales. We recognize revenue based on net consideration we expect to receive from the sale.
Citizens Loan Facilities 43 On January 19, 2024, we entered into a Credit Agreement (the “ Citizens Credit Agreement ”) with a syndicate of banks comprised of Citizens Bank, N.A. as administrative agent (the “ Agent ”), and Bank of America, N.A.
Citizens Loan Facilities On January 19, 2024, we entered into a Credit Agreement (the “ Citizens Credit Agreement ”) with a syndicate of banks comprised of Citizens Bank, N.A. as administrative agent (the “ Agent ”), and Bank of America, N.A.
Recently Adopted Accounting Pronouncements See Item 8, Note 2, Significant Accounting Policies , in the Consolidated Financial Statements for recently adopted accounting pronouncements. 46
Recently Adopted Accounting Pronouncements See Item 8, Note 2, Significant Accounting Policies , in the Consolidated Financial Statements for recently adopted accounting pronouncements.
Contractual Obligations Contractual obligations associated with ongoing business activities are expected to result in cash payments in future periods. See Item 8, Note 18, Commitments and Contingencies , in the Consolidated Financial Statements for more information regarding our contractual commitments.
Contractual Obligations Contractual obligations associated with ongoing business activities are expected to result in cash payments in future periods. See Item 8, Note 14, Commitments and Contingencies , in the Consolidated Financial Statements for more information regarding our contractual commitments.
Our Annual Report for the year ended December 31, 2023 (the “ 2023 Annual Report ”) includes a discussion and analysis of our total company financial condition and results of operations for 2023 compared to 2022 in Part II, Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operations .
Our Annual Report for the year ended December 31, 2024 (the “ 2024 Annual Report ”) includes a discussion and analysis of our total company financial condition and results of operations for 2024 compared to 2023 in Part II, Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operations .
We derive an expectation for product returns based on historical return patterns and other discrete factors which influence return activity, such as changes in our regulatory environment, product recalls, changes in reimbursement rates, changes in reimbursement eligibility and rules, and other factors also impact return patterns.
We derive an expectation for product returns based on historical return patterns and other discrete factors which influence return activity, such as changes in our regulatory environment, product recalls, changes in reimbursement rates, changes in reimbursement eligibility and rules, and other factors.
The increase in cash provided by operating activities was primarily as a result of year-over-year increases in net sales, which drove increases in collections from customers. Investing Activities During the year ended December 31, 2024, net cash used in investing activities was $9.6 million, a increase of $7.4 million, compared to $2.2 million for the year ended December 31, 2023.
The increase in cash provided by operating activities was primarily as a result of year-over-year increases in net sales, which drove increases in collections from customers. Investing Activities During the year ended December 31, 2025, net cash used in investing activities was $6.9 million, a decrease of $2.7 million compared to $9.6 million for the year ended December 31, 2024.
Investigation, restatement and related (benefit) expense Investigation, restatement and related expense primarily related to legal fees that were advanced to certain former officers and directors of the Company under certain indemnification agreements and our liability from legal proceedings that were taken against us. These costs ceased during the year ended December 31, 2024 and are not expected to reoccur.
Investigation, restatement and related (benefit) expense Investigation, restatement and related expense primarily related to legal fees that were advanced to certain former officers and directors of the Company under certain indemnification agreements and our liability from certain legal proceedings that were taken against us. These costs ended during the year ended December 31, 2024.
We had no borrowings outstanding and $75 million of availability under our Revolving Credit Facility (as defined below). The Company is currently paying its obligations in the ordinary course of business.
We had no borrowings outstanding and $75 million of availability under our Revolving Credit Facility (as defined below). We are currently paying our obligations in the ordinary course of business.
We re-evaluate our probability assessments at least quarterly, with any revisions reflected as a cumulative adjustment to expense. Because of the cumulative nature of adjustments, during any period in which we re-evaluate probability, the adjustments could significantly impact our results of operations.
We re-evaluate our probability assessments at least quarterly, with any revisions reflected as a cumulative adjustment to expense. Because of the cumulative nature of adjustments, they could significantly impact our results of operations.
Sensitivity of Estimate to Change As of December 31, 2024, all outstanding performance stock unit awards vest on the basis of stipulated revenue targets in addition to continued employment. Cumulative expense recognized for unvested performance stock unit awards was $5.9 million as of December 31, 2024.
Sensitivity of Estimate to Change As of December 31, 2025, all outstanding performance stock unit awards vest on the basis of stipulated revenue targets in addition to continued employment. Cumulative expense recognized for unvested performance stock unit awards was $7.6 million as of December 31, 2025.
The amount and extent of the valuation allowance necessary to reflect the extent of realization of these deferred tax assets being more likely than not may change due to changes in tax law, a revision to our expectation regarding taxable income in the future, taxable income generated in a period in which we had not previously anticipated taxable income, a change in scheduled reversals of deferred tax liabilities, and other changes.
The amount and extent of the valuation allowance may change due to changes in tax law, a revision to our expectation regarding taxable income in the future, taxable income generated in a period in which we had not previously anticipated taxable income, a change in scheduled reversals of deferred tax liabilities, and other changes.
Our research and development costs also include expenses such as salaries and benefits related to our research department, consulting costs and advisory costs, and regulatory costs. 40 We expense research and development costs as incurred. Fluctuations in research and development expenses can be impacted by the timing and cadence of our clinical trials.
Our research and development costs also include expenses such as salaries and benefits related to our research departments, consulting costs, advisory costs, and regulatory costs. We expense research and development costs as incurred. Fluctuations in research and development expenses are driven by the timing and cadence of our clinical trials.
Income Tax Provision Our effective tax rates for 2024 and 2023 was 26.7% and (120.2)%, respectively, on income from continuing operations before income tax provision of $57.3 million and $30.6 million for 2024 and 2023, respectively. Our effective tax rate in 2024 was favorably impacted by vestings of restricted stock, offset by executive compensation deduction limitations.
Income Tax Provision Our effective tax rates for 2025 and 2024 were 26.7% and 26.7%, respectively, on income from continuing operations before income tax provision of $66.3 million and $57.3 million for 2025 and 2024, respectively. The effective tax rate in each period was favorably impacted by vestings of restricted stock, offset by executive compensation deduction limitations.
Discussion of Cash Flows for 2024 Compared to 2023 Operating Activities from Continuing Operations During the year ended December 31, 2024, net cash provided by operating activities of continuing operations increased $32.2 million to $67.1 million compared to cash provided of $34.9 million for the year ended December 31, 2023.
Discussion of Cash Flows for 2025 Compared to 2024 Operating Activities from Continuing Operations 46 During the year ended December 31, 2025, net cash provided by operating activities of continuing operations increased $6.9 million to $74.0 million compared to cash provided of $67.1 million for the year ended December 31, 2024.
GAAP requires that the net balance of deferred tax assets reflect the extent of utilization which is ‘more likely than not’. This is accomplished through a valuation allowance recorded against gross deferred tax assets.
Transactions which result in lower taxable income in the future give rise to deferred tax assets. GAAP requires that the net balance of deferred tax assets reflect the extent of utilization which is ‘more likely than not’. This is accomplished through a valuation allowance recorded against gross deferred tax assets.
As of December 31, 2024, we had $104.4 million of cash and cash equivalents. Our net working capital at December 31, 2024 was $146.3 million, an increase of $28.0 million from $118.3 million at December 31, 2023. Our current ratio was 4.2 to 1 and 3.6 to 1 as of as of December 31, 2024 and 2023, respectively.
As of December 31, 2025, we had $166.1 million of cash and cash equivalents. Our net working capital at December 31, 2025 was $213.2 million, an increase of $66.9 million from $146.3 million at December 31, 2024. Our current ratio was 4.3 to 1 and 4.2 to 1 as of as of December 31, 2025 and 2024, respectively.
The fair value of restricted stock units and performance stock units are generally measured at the last trading price on the grant date. Options are measured using an appropriate option pricing model using applicable inputs as of the grant date. In each case, the grant date fair value is adjusted for the presence of any market conditions.
Options are measured using an appropriate option pricing model using inputs applicable as of the grant date. In each case, the grant date fair value is adjusted for the presence of any market conditions.
The increase was offset by the repurchase of our historical Series B Preferred Stock of $9.5 million during 2023. Critical Accounting Estimates This Management’s Discussion and Analysis of Financial Condition and Results of Operations discusses our consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States of America (“ GAAP ”).
Critical Accounting Estimates This Management’s Discussion and Analysis of Financial Condition and Results of Operations discusses our consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States of America (“ GAAP ”).
Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations Executive Summary During 2024, we delivered 8.5% growth in net sales, with broad-based contributions by customer type.
Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations Executive Summary During 2025, we delivered 20.0% growth in net sales, with broad-based contributions across Wound and Surgical.
Judgments and Uncertainties We sell our products to individual customers and independent distributors (collectively referred to as “ customers ”). Customers obtain and use products either through ship and bill sales or consignment arrangements.
Net Sales Description We record estimates for returns and allowances as a reduction to net sales based on our expectation for such returns. Judgments and Uncertainties We sell our products to individual customers and independent distributors (collectively referred to as “ customers ”). Customers obtain and use products either through ship and bill sales or consignment arrangements.
Investigation, Restatement and Related Expense Investigation, restatement, and related expenses for the year ended December 31, 2024 was a benefit of $8.7 million, compared to expense of $5.2 million for the year ended December 31, 2023. The benefit was resulted from various settlements related to former officers and other related matters during 2024.
The increase was driven by on-going clinical trials and research studies aimed at strengthening clinical and economic evidence. Investigation, Restatement and Related Expense Investigation, restatement, and related expenses for the year ended December 31, 2024 was a benefit of $8.7 million. The benefit resulted from various settlements related to former officers and other related matters during 2024.
With more than a decade of experience helping clinicians manage acute and chronic wounds, MIMEDX has been dedicated to providing a leading portfolio of products for applications in the wound care, burn, and surgical sectors of healthcare. All of our products sold in the United States are regulated by the FDA.
With nearly two decades of experience helping clinicians manage chronic and other hard-to-heal wounds, MIMEDX provides a leading portfolio of products for applications in the wound care, burn, and surgical sectors of healthcare. All of our products sold in the United States are regulated by the U.S. Food and Drug Administration (“ FDA ”).
Sensitivity of Estimate to Change We have accrued $2.0 million for sales returns as of December 31, 2024. Changes in return patterns or unforeseen changes in regulations or identified product recalls could cause returns significantly in excess of this estimate.
Sensitivity of Estimate to Change We have accrued $2.4 million for sales returns as of December 31, 2025. Changes in return patterns or unforeseen changes in reimbursement policy, regulations or product recalls could cause returns significantly in excess of this estimate. Income Taxes Description We have $19.9 million of net deferred tax assets to defray future tax liability.
If it is subsequently determined that the performance conditions associated with the performance stock unit awards are no longer probable of being met, or performance conditions which were determined to be probable of occurring do not actually occur, we could reverse up to this amount of expense in the period such determination is made.
This was based on the grant-date fair value of each award, the portion of the relevant vesting period that has elapsed and our assessment of the extent to which the vesting conditions are considered probable for each award. 47 If it is subsequently determined that the performance conditions associated with the performance stock unit awards are no longer probable of being met, or performance conditions which were determined to be probable of occurring do not actually occur, we could reflect a benefit of up to this amount in the period such determination is made.
Liquidity and Capital Resources We require capital for our operating activities, including costs associated with the sale of product through direct and indirect sales channels, research and development activities, compliance costs, costs to sell and market our products, regulatory fees, and legal and consulting fees in connection with ongoing litigation and other matters.
OB3 resulted in a current tax benefit resulting from the utilization of deferred tax assets, primarily relating to the utilization of capitalized research and development expenses, and did not affect our effective tax rate in the year ended December 31, 2025. 45 Liquidity and Capital Resources We require capital for our operating activities, including costs associated with the sale of product through direct and indirect sales channels, research and development activities, compliance costs, costs to sell and market our products, regulatory fees, and legal and consulting fees in connection with ongoing litigation and other matters.
This was offset by the last material payment towards the resolution of matters stemming from the findings of our historical Audit Committee investigation during the year ended December 31, 2024.
This was offset by the last material payment towards the resolution of matters stemming from the findings of our historical Audit Committee investigation. These expenses ceased in 2024. Amortization of Intangible Assets Amortization expense related to intangible assets for the year ended December 31, 2025 was $0.4 million, compared to $0.8 million for the year ended December 31, 2024.
For example, we pay sales agents a greater commission than our internal sales force, meaning that we could incur greater commission expenses if a greater proportion of our sales are through sales agents. We expect our G&A expense to fluctuate based on headcount.
For example, we pay sales agents a greater commission than our internal sales force, meaning that we could incur greater commission expenses if a greater proportion of our sales are through sales agents. G&A expense reflects costs related to functions which support our business, such as legal, finance, human resources, and other such functions.
Results of Continuing Operations for 2024 Compared to 2023 Year Ended December 31, (in thousands) 2024 2023 $ Change % Change Net sales $ 348,879 $ 321,477 $ 27,402 8.5 % Cost of sales 60,073 54,634 5,439 10.0 % Gross profit 288,806 266,843 21,963 8.2 % Selling, general and administrative 225,087 211,124 13,963 6.6 % Research and development 12,341 12,665 (324) (2.6) % Investigation, restatement and related (8,698) 5,176 (13,874) nm Amortization of intangible assets 765 762 3 0.4 % Impairment of intangible assets 446 — 446 100.0 % Interest expense, net (1,006) (6,457) 5,451 (84.4) % Other expense, net (565) (26) (539) nm Income tax provision benefit (expense) (15,296) 36,806 (52,102) nm Net income (loss) from continuing operations $ 41,998 $ 67,439 $ (25,441) (37.7) % Net Sales We recorded net sales for the year ended December 31, 2024 of $348.9 million, an increase of $27.4 million, or 8.5%, over net sales for the year ended December 31, 2023 net sales of $321.5 million.
Results of Continuing Operations for 2025 Compared to 2024 Year Ended December 31, (in thousands) 2025 2024 $ Change % Change Net sales $ 418,630 $ 348,879 $ 69,751 20.0 % Cost of sales 73,013 60,073 12,940 21.5 % Gross profit 345,617 288,806 56,811 19.7 % Selling, general and administrative 266,194 225,087 41,107 18.3 % Research and development 15,097 12,341 2,756 22.3 % Investigation, restatement and related — (8,698) 8,698 (100.0) % Amortization of intangible assets 439 765 (326) (42.6) % Impairment of intangible assets — 446 (446) (100.0) % Interest income (expense), net 2,933 (1,006) 3,939 nm Other expense, net (558) (565) 7 (1.2) % Income tax provision expense (17,684) (15,296) (2,388) 15.6 % Net income from continuing operations $ 48,578 $ 41,998 $ 6,580 15.7 % Net Sales We recorded net sales for the year ended December 31, 2025 of $418.6 million, an increase of $69.8 million, or 20.0%, over net sales for the year ended December 31, 2024 net sales of $348.9 million.
Share-Based Compensation Description We measure the fair value of stock options and other stock-based awards granted to employees on the grant date and recognize the assessed fair value as share-based compensation expense, straight-line, over the requisite service period to achieve the award based on the vesting requirements to the extent that the achievement of performance conditions associated with such awards, as applicable, are determined to be “probable.” Judgments and Uncertainties Share-based payment arrangements are measured at fair value on the grant date.
Share-Based Compensation Description We measure the fair value of stock options and other stock-based awards granted to employees on the grant date and recognize the assessed fair value as share-based compensation expense over the requisite service period based on the award’s vesting conditions.
The following table shows the composition of this expense between selling and marketing (“ S&M ”) and general and administrative (“ G&A ”) components (amounts in thousands): Year Ended December 31, Change 2024 2023 $ % Selling and marketing $ 175,562 $ 161,833 $ 13,729 8.5 % General and administrative 49,525 49,291 234 0.5 % Selling, general and administrative $ 225,087 $ 211,124 $ 13,963 6.6 % Sales and marketing expenses increased $13.7 million, or 8.5%, year over year, which was driven by increases in commissions due to higher sales and higher effective commission rates.
The following table shows the composition of this expense between S&M and general G&A components (amounts in thousands): Year Ended December 31, Change 2025 2024 $ % Selling and marketing $ 209,681 $ 175,562 $ 34,119 19.4 % General and administrative 56,513 49,525 6,988 14.1 % Selling, general and administrative $ 266,194 $ 225,087 $ 41,107 18.3 % Sales and marketing expenses increased $34.1 million, or 19.4%, year over year, primarily due to higher commissions driven by increased sales and elevated effective commission rates, along with higher bad debt expense.
Our sales by product category were as follows (amounts in thousands): 41 Year Ended December 31, % of net sales Change 2024 2023 2024 2023 $ % Wound $ 231,004 $ 205,660 66 % 64 % $ 25,344 12.3 % Surgical 117,875 115,817 34 % 36 % $ 2,058 1.8 % Net sales $ 348,879 $ 321,477 100 % 100 % $ 27,402 8.5 % Net sales in the Wound category were $231.0 million for the year ended December 31, 2024, a $25.3 million, or 12.3% increase, compared to $205.7 million for the year ended December 31, 2023.
Our sales by product category were as follows (amounts in thousands): Year Ended December 31, % of net sales Change 2025 2024 2025 2024 $ % Wound $ 276,326 $ 231,004 66 % 66 % $ 45,322 19.6 % Surgical 142,304 117,875 34 % 34 % 24,429 20.7 % Net sales $ 418,630 $ 348,879 100 % 100 % $ 69,751 20.0 % Net sales in the Wound category were $276.3 million for the year ended December 31, 2025, a $45.3 million, or 19.6% increase, compared to $231.0 million for the year ended December 31, 2024.
The increase in cost of sales was driven by the increase in sales volume and the changes in margins noted above. Selling, General and Administrative Expense SG&A expense increased $14.0 million, or 6.6%, to $225.1 million for December 31, 2024, compared to $211.1 million for December 31, 2023.
The increase was driven by higher sales volume, and increased manufacturing inefficiencies. 44 Selling, General and Administrative Expense SG&A expense increased $41.1 million, or 18.3%, to $266.2 million for December 31, 2025, compared to $225.1 million for December 31, 2024.
Interest expense, net We incur interest expense primarily through stated interest on our outstanding term and revolving loans, to the extent that they are outstanding. The interest on our term and revolving loans are currently tied to applicable Secured Overnight Financing Rates (“ SOFR ”). Increases in SOFR could cause our interest expense to increase.
Interest income (expense), net We incur interest expense primarily from stated interest on our outstanding term loan and revolving credit facilities, to the extent such borrowings are outstanding. Interest on these facilities is currently based on the applicable term Secured Overnight Financing Rate (“ SOFR ”), and fluctuations in SOFR may cause our interest expense to vary.
Other activity influencing interest expense relates to the amortization of deferred financing costs and original issue discount associated with credit facilities outstanding. This amount is presented net of interest income, which we generate from our treasury management. Income Tax Provision We generate tax liability primarily in the United States and in various states in which we have nexus.
We generate interest income from amounts held in various money market accounts. In addition, interest expense includes the amortization of deferred financing costs and original issue discounts associated with our credit facilities. This amount is presented net of interest income earned through our treasury management activities.
Gross profit is calculated as net sales less cost of goods sold. Gross margin is calculated as gross profit divided by net sales. Our gross margin is affected by product and geographic sales mix, realized pricing of our products, the efficiency of our manufacturing operations and the costs of materials used to make our products.
Our gross margin is affected by product and geographic sales mix, realized pricing of our products, the efficiency of our manufacturing operations and the costs of materials used to make our products. Regulatory actions, including with respect to reimbursement for our products, may require costly expenditures or result in pricing pressure, and may decrease our gross profit and gross margin.
Research and development expense Research and development expense relates to our investments to expand our product pipeline and platforms, including historically through clinical trials, as well as expenditures in improvements to our manufacturing process and the enhancement of existing products.
This includes personnel costs associated with these functions, insurance, and certain professional fees. We expect our G&A expense to fluctuate based on headcount. Research and development expense Research and development expense relates to our investments to expand our product pipeline and platforms, including clinical trials as well as improvements to our manufacturing process and the enhancement of existing products.
HELIOGEN is a shelf-stable offering that contains Type I and Type III collagen and mimics the native composition of structural connective tissue, HELIOGEN is manufactured by Regenity Biosciences. 39 This discussion, which presents our results for the fiscal years ended December 31, 2024 and 2023, should be read in conjunction with our Consolidated Financial Statements and the accompanying notes.
This discussion, which presents our results for the fiscal years ended December 31, 2025 and 2024, should be read in conjunction with our Consolidated Financial Statements and the accompanying notes.
Improvements in our treasury management further aided the decrease. This decrease was partially offset by a $1.4 million loss on extinguishment of debt due to repaying and terminating a previous loan agreement during the first quarter of 2024.
Additionally, we recorded a $1.4 million loss on extinguishment of debt in the first quarter of 2024 due to the repayment and termination of a previous loan agreement.
We must also comply with certain financial covenants, including a maximum total net leverage ratio and a minimum consolidated fixed charge coverage ratio, as well as other customary restrictive covenants. In addition, on January 19, 2024, we borrowed $30.0 million under the Revolving Credit Facility and $20.0 million under the Term Loan Facility.
All obligations are required to be paid in full on January 19, 2029 (the “ Maturity Date ”). The Citizens Credit Agreement requires that we comply with certain financial covenants, including a maximum total net leverage ratio and a minimum consolidated fixed charge coverage ratio, as well as other customary restrictive covenants.
These customers choose products like ours based upon a variety of factors, including clinical efficacy, availability, handling characteristics, and reimbursement coverage and payer sources.
These customers choose products like ours based upon a variety of factors, including clinical efficacy, customer engagement programs, availability, handling characteristics, reimbursement coverage and payer sources. Net sales are recognized based on the consideration we expect to receive from the sale at the point in time when control of the goods is transferred to the customer.
Judgments and Uncertainties Deferred income taxes arise from temporary differences between the tax basis of assets and liabilities and their reported amounts in the financial statements. Transactions which result in lower taxable income in the future give rise to deferred tax assets.
We record a valuation allowance to offset our gross deferred tax asset to the extent that realization of these assets is not “more likely than not.” Judgments and Uncertainties Deferred income taxes arise from temporary differences between the tax basis of assets and liabilities and their reported amounts in the financial statements.
Sensitivity of Estimate to Change As of December 31, 2024, we had $0.5 million in valuation allowances recorded against our deferred tax assets balance of $28.8 million.
Any changes to the valuation allowance are reflected in the period identified as a component of income tax provision expense. Sensitivity of Estimate to Change 48 As of December 31, 2025, we had $0.3 million in valuation allowance recorded against our gross deferred tax assets balance of $19.9 million.
This was offset by a decrease in capital expenditures, year over year. 44 Financing Activities During the year ended December 31, 2024, net cash used in financing activities was $34.2 million, an increase of $25.6 million compared to $8.6 million for the year ended December 31, 2023. During 2024, we entered into the Citizens Credit Agreement, as described above.
The decline was primarily driven by lower product acquisition costs and reduced capital expenditures in 2025. Financing Activities During the year ended December 31, 2025, net cash used in financing activities was $5.4 million, a decrease of $28.8 million compared to $34.2 million for the year ended December 31, 2024.
Cost of goods sold and gross profit Cost of goods sold includes product testing costs, quality assurance costs, personnel costs, manufacturing costs, raw materials and product costs, depreciation and facility costs associated with our manufacturing and warehouse facilities. Fluctuations in our cost of goods sold correspond with the fluctuations in these costs as well as sales volume.
Net sales consists of the gross selling price of the product less any discounts, rebates and other customer incentives, fees paid to GPOs, and estimates for sales returns. 42 Cost of goods sold and gross profit Cost of goods sold includes product testing costs, quality assurance costs, personnel costs, manufacturing costs, raw materials and product costs, depreciation, amortization of certain purchased assets and facility costs associated with our manufacturing and warehouse facilities.
The amount of any incremental expense recognition or reversal will depend on the magnitude and timing of such change in estimate.
As of December 31, 2025, a revision of expense to reflect the maximum hypothetical attainment of all unvested performance stock units would result in a $17.1 million increase to expense. The amount of any incremental expense recognition or reversal will depend on the magnitude and timing of such change in estimate.
We do not expect activity to be material in future periods. 42 Amortization of Intangible Assets Amortization expense related to intangible assets were $0.8 million for each of the years ended December 31, 2024 and 2023. Impairment of Intangible Assets Impairment for the year ended December 31, 2024 was $0.4 million, which relates to abandoned patents.
Impairment of Intangible Assets There was no impairment for the year ended December 31, 2025, compared to $0.4 million for the year ended December 31, 2024. The impairment of intangible assets in 2024 related to abandoned patents.
Research and Development Expense Our research and development (“ R&D ”) expense was $12.3 million for the year ended December 31, 2024, compared to $12.7 million for the year ended December 31, 2023. The decrease in R&D expense related to the timing of our product development activities, which primarily related to EPIEFFECT in 2023.
General and administrative expense increased $7.0 million, or 14.1%, year-over-year, driven by ongoing legal and regulatory disputes, transaction-related costs, and severance costs. Research and Development Expense Our research and development (“ R&D ”) expense was $15.1 million for the year ended December 31, 2025, compared to $12.3 million for the year ended December 31, 2024.
Within Surgical and Other, our product offering includes AMNIOFIX and AMNIOEFFECT, which are positioned for use in a variety of applications and surgical settings, including lower extremity repair, plastic surgery, vascular surgery and multiple orthopedic repairs and reconstructions.
Our Surgical portfolio includes AMNIOFIX®, AMNIOEFFECT®, AMNIOBURN®, AMNIOCORD®, AXIOFILL®, and HELIOGEN™, which are marketed for use in diverse surgical applications, including lower extremity repair, plastic and reconstructive surgery, vascular procedures, and multiple orthopedic repairs. HELIOGEN™ is manufactured by third-party supplier Regenity Biosciences, Inc.
In February 2024, we repaid the initial $30.0 million drawing under the Revolving Credit Facility. There were no borrowings on the Revolving Credit Facility outstanding as of December 31, 2024.
As of December 31, 2025 , we have $18.0 million of principal outstanding on the Term Loan Facility that bears interest at 6.1% and no borrowings outstanding under the Revolving Credit Facility.
This effect was offset by a favorable product mix and our continued execution on scrap improvement projects, partially offset by throughput pressures. Cost of sales for the year ended December 31, 2024 was $60.1 million, an increase of $5.4 million, or 10.0%, compared to $54.6 million for the year ended December 31, 2023.
Cost of sales for the year ended December 31, 2025 was $73.0 million, an increase of $12.9 million, or 21.5%, compared to $60.1 million for the year ended December 31, 2024.
Regulatory actions, including with respect to reimbursement for our products, may require costly expenditures or result in pricing pressure, and may decrease our gross profit and gross margin. Selling, general and administrative expense Selling, general and administrative expense consists of both selling and marketing (“ S&M ”) and general and administrative (“ G&A ”) expenses.
Selling, general and administrative expense Selling, general and administrative expense consists of both selling and marketing (“ S&M ”) and general and administrative (“ G&A ”) expenses.
Interest Expense, Net Interest expense decreased $5.5 million to $1.0 million for the year ended December 31, 2024 from $6.5 million for the year ended December 31, 2023. The decrease was the result of a decrease in outstanding debt and lower rates under the Citizens Credit Facilities after the Debt Refinancing Transactions (as defined below) was completed in January 2024.
Interest Income (Expense), Net Net interest income (expense) was $2.9 million for the year ended December 31, 2025, compared to $(1.0) million for the year ended December 31, 2024. The favorable increase was primarily driven by improved treasury management. a reduction in outstanding debt, and lower interest rates.
Net sales in the Surgical category grew by $2.1 million, or 1.8%, to $117.9 million for the year ended December 31, 2024, compared to $115.8 million for the year ended December 31, 2023. The increase reflects growing sales volume contributions from AMNIOEFFECT, partially offset by lower AXIOFILL compared to the prior year due to regulatory headwinds.
Net sales in the Surgical category grew by $24.4 million, or 20.7%, to $142.3 million for the year ended December 31, 2025, compared to $117.9 million for the year ended December 31, 2024. The increase was primarily driven by sales of AMNIOFIX®, AMNIOEFFECT®, and HELIOGEN® across a range of surgical procedures.
Our effective tax rate is also impacted by other permanent items, primarily executive compensation limitations and windfall or shortfall on the vesting of stock awards.
Material deviations from this effective tax rate in each period is generally the result of the periodic effects 43 of certain permanent differences between the book and tax treatment of certain transactions, including windfall or shortfall on vestings of restricted stock awards and limitations on the deduction of executive compensation.
From time to time, we will also acquire, manufacture and market other products in the wound care, surgical or other products in response to market demands or to maintain our competitive position. In 2024, we also launched HELIOGEN, a particulate xenograft product aimed at addressing complex wounds primarily in the surgical setting.
Additionally, in early 2026 we began distributing three additional Surgical Products: G4Derm Plus, NovaForm and Hydrelix to further expand our Surgical product offering. From time to time, we may acquire, manufacture, or market additional Wound or Surgical products in response to market demand or to maintain our competitive position.