CALIX, INC

We fund our operations and investing activities from cash flow generated from our operations as well as the issuance of common stock under our equity incentive plans. As of June 27, 2026, we had cash, cash equivalents and marketable securities of $194.3 million, which consisted of deposits held at banks and major financial institutions and highly liquid marketable securities such as U.S. government and its agency securities, corporate debt securities and commercial paper.

Operating Activities

Net cash provided by operating activities was $31.1 million for the six months ended June 27, 2026 and consisted of net income of $28.3 million and non-cash charges of $49.7 million partially offset by cash flow decreases of $46.8 million reflected in the net change in assets and liabilities. Non-cash charges primarily consisted of stock-based compensation of $37.3 million, depreciation and amortization of $8.8 million and deferred income taxes of $4.3 million partially offset by the net accretion of available-for-sale securities of $0.7 million.

Cash flow decreases resulting from the net change in assets and liabilities primarily consisted of an increase in inventory of $46.7 million to support future revenue, an increase in accounts receivable of $37.0 million due to higher revenue, an increase in prepaid expenses and other assets of $10.1 million mainly due to an increase in inventory deposits and a decrease in accrued liabilities of $9.6 million relating to various factors including a decrease in incentive compensation-related accruals. This was partially offset by an increase in accounts payable of $50.9 million due to increased inventory purchases and an increase in deferred revenue of $5.8 million primarily related to an increase in our remaining performance obligations on appliances.

Net cash provided by operating activities was $56.6 million for the six months ended June 28, 2025 and consisted of a net loss of $5.0 million offset by non-cash charges of $50.5 million and cash flow increases of $11.0 million reflected in the net change in assets and liabilities. Non-cash charges primarily consisted of stock-based compensation of $45.4 million and depreciation and amortization of $8.6 million partially offset by deferred income taxes of $1.3 million and the net accretion of available-for-sale securities of $2.1 million. Cash flow increases resulting from the net change in assets and liabilities primarily consisted of a decrease in accounts receivable of $16.2 million due to the linearity of shipments through the quarter and timing of customer payments, a decrease in prepaid expenses and other assets of $13.8 million mainly due to a reduction in our inventory deposits and an increase in accounts payable of $2.3 million due to the timing of inventory receipts. This was partially offset by an increase in inventory of $7.8 million to support increased revenue, a decrease in accrued liabilities of $11.7 million relating to various factors including a decrease in incentive compensation-related accruals and a decrease in deferred revenue of $1.7 million.

Investing Activity

For the six months ended June 27, 2026, cash provided by investing activities consisted of net maturities and sales of marketable securities of $119.6 million partially offset by capital expenditures of $12.7 million, consisting primarily of purchases of test equipment.

For the six months ended June 28, 2025, cash provided by investing activities of $25.9 million consisted of net maturities and sales of marketable securities of $33.9 million partially offset by capital expenditures of $8.0 million, consisting primarily of purchases of test and computer equipment.

Financing Activities

Net cash used in financing activities of $212.2 million for the six months ended June 27, 2026 primarily consisted repurchases of our common stock of $240.2 million partially offset by proceeds from the issuance of common stock related to our equity plans of $28.1 million.

Net cash used in financing activities of $49.3 million for the six months ended June 28, 2025 primarily consisted repurchases of our common stock of $73.5 million partially offset by proceeds from the issuance of common stock related to our equity plans of $24.2 million.

Working Capital and Capital Expenditure Needs

Our material cash commitments include non-cancelable firm purchase commitments, normal recurring trade payables, compensation-related and expense accruals and operating leases. We believe that our outsourced approach to manufacturing provides us significant flexibility in both managing inventory levels and financing our inventory. Furthermore, we have a common stock repurchase program, which had $94.1 million available as of June 27, 2026. Our stock repurchase program does not require us to purchase a specific number of shares and may be modified, suspended or terminated at any time. In April 2026, our Board of Directors authorized a $100.0 million increase to our common stock repurchase program.

We believe, based on our current operating plan and expected operating cash flows, that our existing cash, cash equivalents and marketable securities will be sufficient to meet our anticipated cash needs for at least the next twelve months. If we are unable to generate sufficient cash flows or obtain other sources of liquidity, we will be forced to limit or terminate our stock repurchase program, limit our development activities, reduce our investment in growth initiatives and/or institute cost-cutting measures, all of which may adversely impact our business and potential growth.

Contractual Obligations and Commitments

Our principal commitments as of June 27, 2026 consisted of contractual obligations under non-cancelable outstanding purchase obligations and operating lease obligations for office space. The following table summarizes our contractual obligations as of June 27, 2026 (in thousands):

(1) Represents outstanding purchase commitments to be delivered by our third-party manufacturers or other vendors. See Note 6, “Commitments and Contingencies” of the Notes to Condensed Consolidated Financial Statements included in Part I, Item 1 of this Quarterly Report on Form 10-Q for further discussion regarding our outstanding purchase commitments related to our third-party manufacturers.

(2) Future minimum operating lease obligations in the table above primarily include payments for our office locations, which expire at various dates through 2033. See Note 6 “Commitments and Contingencies” of the Notes to Condensed Consolidated Financial Statements included in Part I, Item 1 of this Quarterly Report on Form 10-Q for further discussion regarding our operating leases.