Nextdoor Investor Update Q3 2025 © 2025 Nextdoor. All rights reserved. Any copying or use of this confidential information is strictly prohibited without the express written permission of Nextdoor. Confidential, attorney-client privileged. Exhibit 99.1

John T. Williams 2 Head of Investor Relations

Certain statements in this Investor Update may be considered “forward-looking statements” within the meaning of the “safe harbor” provisions of the U.S. Private Securities Litigation Reform Act of 1995. In some cases, you can identify forward-looking statements by terminology such as “may,” “should,” “expect,” “intend,” “will,” “estimate,” “anticipate,” “believe,” “predict,” “project,” “target,” “plan,” or “potentially” or the negatives of these terms or variations of them or similar terminology. These statements include, but are not limited to, statements regarding our future performance and our market opportunity, including expected financial results for the fourth quarter of 2025 and 2026, trends and expectations regarding our business and operating results, including the implementation and potential impact of our new Nextdoor initiative, our expectations on Verified Neighbor growth, our business strategy and plans, and our objectives and future operations, including our expansion into new markets. Forward-looking statements are based upon various estimates and assumptions, as well as information known to us as of the date of this Investor Update, and are subject to risks and uncertainties. Accordingly, actual results could differ materially due to a variety of factors, including: our ability to scale our business and monetization efforts; our ability to expand business operations abroad; our limited operating history; risks associated with managing our growth; our ability to achieve and maintain profitability in the future; the effects of the highly competitive market in which we operate; the impact of macroeconomic conditions on our business, including the impact of significant political, trade and regulatory developments; our ability to attract new and retain existing customers and users, or renew and expand our relationships with them; our ability to anticipate and satisfy customer preferences; market acceptance of our platform; our ability to successfully develop and timely introduce new products and services; risks associated with the use of AI and ML-driven features in our platform; our ability to achieve our objectives of strategic and operational initiatives; cybersecurity risks to our various systems and software; the impact of privacy and data security laws and other applicable laws and regulations; and other general market, political, economic, and business conditions. Additional risks and uncertainties that could affect our financial results and business are more fully described in our Quarterly Report on Form 10-Q for the period ended September 30, 2025, filed on November 5, 2025, and our other SEC filings, which are available on the Investor Relations page of our website at investors.nextdoor.com and on the SEC’s website at www.sec.gov. All forward-looking statements contained herein are based on information available to us as of the date hereof and you should not rely upon forward-looking statements as predictions of future events. The events and circumstances reflected in the forward-looking statements may not be achieved or occur. Although we believe that the expectations reflected in the forward-looking statements are reasonable, we cannot guarantee future results, performance, or achievements.We undertake no obligation to update any of these forward-looking statements for any reason after the date of this Investor Update or to conform these statements to actual results or revised expectations, except as required by law. Undue reliance should not be placed on the forward-looking statements in this Investor Update. This Investor Update includes certain non-GAAP financial measures (including on a forward-looking basis). These non-GAAP measures are in addition to, and not a substitute for or superior to, measures of financial performance prepared in accordance with GAAP and should not be considered as an alternative to their nearest GAAP equivalent or any other performance measures derived in accordance with GAAP. A reconciliation of the non-GAAP financial measures used in this Investor Update to their nearest GAAP equivalent is included in the Appendix to this Investor Update. Nextdoor believes that these non-GAAP measures of financial results (including on a forward-looking basis) provide useful supplemental information to investors about Nextdoor. Nextdoor’s management uses forward-looking non-GAAP measures to evaluate Nextdoor’s projected financials and operating performance. However, there are a number of limitations related to the use of these non-GAAP measures and their nearest GAAP equivalents, including that they exclude significant expenses that are required by GAAP to be recorded in Nextdoor’s financial measures. In addition, other companies may calculate non-GAAP measures differently, or may use other measures to calculate their financial performance, and therefore, Nextdoor’s non-GAAP measures may not be directly comparable to similarly titled measures of other companies. Additionally, to the extent that forward-looking non-GAAP financial measures are provided, they are presented on a non-GAAP basis without reconciliations of such forward-looking non-GAAP measures due to the inherent difficulty in forecasting and quantifying certain amounts that are necessary for such reconciliations. 3 Disclaimer

5 Q3’25 Performance Update Users -3% y/y 21.6M Platform WAU Modest (1%) sequential decline as we reduced notifications to drive higher quality usage and engagement Revenue +5% y/y $69M Self-serve +33% y/y on strong demand from advertisers seeing better performance on our platform Profitability $13M Net Loss; Margin +4 ppt y/y $4M Adj. EBITDA; Margin +8 ppt y/y Positive Q3 Adjusted EBITDA driven by strong revenue, ongoing productivity focus Metrics as of 9/30/2025. Some figures may not tie due to rounding. A reconciliation of non-GAAP metrics used in this Investor Update to their most comparable GAAP measures is provided in the Appendix at the end of this Investor Update.

Our self-serve channel remains a growth engine. Q3 revenue was $69M, +5% year-over-year and reflecting strong demand from self-serve advertisers. Self-serve channel revenue grew 33% year-over-year in Q3 and represented nearly 60% of Q3 total revenue. We delivered on our commitment to complete our programmatic supply integrations. 6 Revenue Some figures may not tie due to rounding.

7 Self-Serve Some figures may not tie due to rounding. Our product investments have driven durable self-serve momentum. Investments in self-serve make campaign creation/management easier for all customers. Automated click and conversion optimization make it easier for buyers using our self-serve platform to achieve stronger performance outcomes. Self-serve usage unlocks operating leverage, productivity improvements for advertisers.