Investor Presentation Dated October 30, 2020 Exhibit 99.1

Legal Information and Disclaimer This presentation and oral statements made regarding the subject of this presentation contain forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. These forward-looking statements reflect Coastal Financial Corporation (“Coastal”)’s current views with respect to, among other things, future events and Coastal’s financial performance. Any statements about Coastal’s expectations, beliefs, plans, predictions, forecasts, objectives, assumptions or future events or performance are not historical facts and may be forward-looking. These statements are often, but not always, made through the use of words or phrases such as “anticipate,” “believes,” “can,” “could,” “may,” “predicts,” “potential,” “should,” “will,” “estimate,” “plans,” “projects,” “continuing,” “ongoing,” “expects,” “intends” and similar words or phrases. Any or all of the forward-looking statements in (or conveyed orally regarding) this presentation may turn out to be inaccurate. The inclusion of or reference to forward-looking information in this presentation should not be regarded as a representation by Coastal or any other person that the future plans, estimates or expectations contemplated by Coastal will be achieved. Coastal has based these forward-looking statements largely on its current expectations and projections about future events and financial trends that Coastal believes may affect its financial condition, results of operations, business strategy and financial needs. Coastal’s actual results could differ materially from those anticipated in such forward-looking statements as a result of risks, uncertainties and assumptions that are difficult to predict. Factors that could cause actual results to differ materially from those in the forward-looking statements include, without limitation, the risks and uncertainties discussed under “Risk Factors” in Form 10-K for the year ended December 31, 2019, Coastal’s Quarterly Report on Form 10-Q for the most recent quarter, and in any of Coastal’s subsequent filings with the Securities and Exchange Commission. If one or more events related to these or other risks or uncertainties materialize, or if Coastal’s underlying assumptions prove to be incorrect, actual results may differ materially from what Coastal anticipates. You are cautioned not to place undue reliance on forward-looking statements. Further, any forward-looking statement speaks only as of the date on which it is made and Coastal undertakes no obligation to update or revise any forward-looking statement to reflect events or circumstances after the date on which the statement is made or to reflect the occurrence of unanticipated events. This presentation includes industry and trade association data, forecasts and information that Coastal has prepared based, in part, upon data, forecasts and information obtained from independent trade associations, industry publications and surveys, government agencies and other information publicly available to Coastal, which information may be specific to particular markets or geographic locations. Some data is also based on Coastal’s good faith estimates, which are derived from management’s knowledge of the industry and independent sources. Industry publications, surveys and forecasts generally state that the information contained therein has been obtained from sources believed to be reliable. Statements as to Coastal’s market position are based on market data currently available to Coastal. Although Coastal believes these sources are reliable, Coastal has not independently verified the information contained therein. While Coastal is not aware of any misstatements regarding the industry data presented in this presentation, Coastal’s estimates involve risks and uncertainties and are subject to change based on various factors. Similarly, Coastal believes that its internal research is reliable, even though such research has not been verified by independent sources. Trademarks referred to in this presentation are the property of their respective owners, although for presentational convenience we may not use the ® or the TM symbols to identify such trademarks. This presentation includes certain non-GAAP financial measures for 2017 to exclude the impact of a deferred tax asset revaluation due to the enactment of the Tax Cuts and Jobs Act of 2017 (the “Tax Cuts and Jobs Act”), including adjusted net income, adjusted earnings per share, adjusted effective tax rate, adjusted return on average assets and adjusted return on average shareholders’ equity. These non-GAAP financial measures and any other non-GAAP financial measures that we discuss in this presentation should not be considered in isolation, and should be considered as additions to, and not substitutes for or superior to, measures of financial performance prepared in accordance with GAAP. There are a number of limitations related to the use of these non-GAAP financial measures versus their most directly comparable GAAP equivalents. For example, other companies may calculate non-GAAP financial measures differently or may use other measures to evaluate their performance, all of which could reduce the usefulness of Coastal’s non-GAAP financial measures as tools for comparison. See the Appendix to this presentation for a reconciliation of the non-GAAP financial measures used in (or conveyed orally during) this presentation to their most directly comparable GAAP financial measures. This presentation also contains certain non-GAAP financial measures in addition to results presented in accordance with GAAP relating to “pre-tax, pre-provision net income” and “pre-tax, pre-provision return on average assets” to illustrate the impact of provision for loan losses and provision for income taxes on net income and return on average assets. The most directly comparable GAAP measure to “pre-tax, pre-provision net income” is net income. The most directly comparable GAAP measure to “pre-tax, pre-provision return on average assets” is return on average assets. Reconciliations of the GAAP and non-GAAP measures are presented in the Appendix of this presentation. This presentation also contains certain non-GAAP financial measures in addition to results presented in accordance with GAAP to illustrate and identify the impact of Paycheck Protection Program (PPP) loans, Paycheck Protection Program Liquidity Facility (PPPLF) borrowings, customer deposits from PPP loans, and related earnings and expenses. By removing these significant items and show what the results would have been without them we are providing investors with the information to better compare results with periods that did not have these significant items. Adjusted allowance for loan losses to loans receivable is a non-GAAP measure that excludes the impact of PPP loans on balance sheet. The most directly comparable GAAP measure is allowance for loan losses. Adjusted yield on loans receivable is a non-GAAP measure that excludes the impact of PPP loans on balance sheet. The most directly comparable GAAP measure is yield on loans. Adjusted contractual yield on loans receivable, excluding earned fees is a non-GAAP measure that excludes the impact of PPP loans on balance sheet. The most directly comparable GAAP measure is contractual yield on loans, excluding fees. Reconciliations of the GAAP and non-GAAP measures are presented in the Appendix of this presentation. Non-GAAP Financial Measures

Three Prong Long-Term Strategy Driving Value for Shareholders – 3 Prong Strategy The Community Bank (CCB) Provide Banking as a Service (BaaS) (CCBX) Coastal’s Digital Bank (CCBD) Compliance Operational Integrity No matter how we talk to our customers or what type of customer, Compliance and Operational Integrity are the same.

Coastal Community Bank was established in 1997 with a focus on serving small to medium-sized businesses within the Puget Sound region Dedicated to community banking 2014-2020 Recipient of the prestigious “5-Star Rating” from BauerFinancial, Inc. Stanwood & Camano News “Best Bank” (7 years in a row) 2013 * 2014 * 2015 * 2016 * 2017 * 2018 * 2019 * 2020 “2020 & 2019 American Banker Top 200 Community Bank” in some of Washington’s most attractive markets 5 5 90 Everett Herald – 2014, 2015, 2016 2017, 2018, and 2019 Readers Choice – “Best Bank” Headquarters Everett, Washington – the largest city in and county seat of Snohomish County Branches 15 full-service banking locations 12 in Snohomish County Opened Edmonds branch in October 2018 Opened Arlington branch in June 2020 2 in Island County 1 in King County (Seattle) Size and Scale $1.7 billion in total assets $1.5 billion in total loans $1.4 billion in total deposits Largest community bank by deposit market share in Snohomish County Focus Meet the financial needs of the community Make decisions locally Support the communities the Bank serves Corporate Overview Note: Data as of September 30, 2020 unless otherwise indicated

Core Deposits (2) Financial Highlights Total Assets Note: Annual data as of or for the year ended December 31 of each respective year (2) Consists of total deposits less all time deposits, BaaS, and brokered deposits (3) 2017 net income is adjusted to exclude the impact of a deferred tax asset revaluation due to the enactment of the Tax Cuts and Jobs Act. Refer to “Non-GAAP Reconciliation” in the Appendix for additional details. (3) Total Loans Net Income Tangible equity to tangible assets is a non-GAAP measure. Since there is no goodwill or other intangible assets as of the date indicated, tangible equity to tangible assets is the same as total shareholders’ equity to total assets as of the date indicated.

COVID-19 Response – PPP Loans As a preferred Small Business Administration (“SBA”) lender, we have funded $452.8 million in financial assistance to existing and new small business customers via the Paycheck Protection Program (“PPP”) as provided in the Coronavirus Aid, Relief and Economic Security Act (“CARES Act”), which represents 2,879 loans, impacting nearly 40,000 employees in our communities as of September 30, 2020. Utilized the Paycheck Protection Program Liquidity Facility (“PPPLF”) to fund PPP loans. $202.6 million loans pledged and borrowed at September 30, 2020.

COVID-19 Response – Loan Modifications Modifications to Total Loan Loan Modifications By Industry(1) Total Deferrals by Ending Date1) Status of All Deferred Loans(1) Deferral balances reflect deferrals still remaining as of September 30,2020

Core Markets – Snohomish County Largest Locally HQ’d Bank in Snohomish County Notable Employers Source: S&P Global Market Intelligence; FDIC’s Summary of Deposits as of June 30, 2020 Total Deposits in Market for Coastal Financial Corporation are $1.1 billion at September 30, 2020 (2) Puget Sound Region Snohomish County Branch Statistics (1) (1) (2) (2)

Employee Leadership in Non-Profit Organizations Know our markets and our customers Meaningfully contribute to communities we serve #1 Contributor of Service Hours per Employee Basic Principles of Community Banking Coastal employees contributed the most community service hours per employee in 2017 as reported by the Puget Sound Business Journal Top 15 in total 2018 volunteer hours of all business reporting in the Puget Sound per the Puget Sound Business Journal Coastal employees volunteer or serve on the Boards of 56 local non-profit organizations within the community Employee volunteer hours surpassed 9,700 supporting more than 173 organizations in 2019 “It's representative of the bank's commitment to Community. We believe this is the best way to deliver charitable dollars to the communities where we do business. This is about the bank's employees doing something together in order to make a real impact.“ – Lee Pintar, founder of Coastal Community Bank Coastal Employee Giving Fund Created in 2002, the Coastal Employee Giving Fund through the Greater Everett Foundation, has given over 397 grants exceeding $572,650 Awards and Achievements “Small-Cap All Star Class of 2020 and 2019” - Sandler O’Neill “Top 200 Community Bank in 2020” “Top 200 Community Bank in 2019” - American Banker Community Bank, Community Bankers 2019, 2018, 2017, 2016, 2015 and 2014 Readers Choice “Best Bank” - Everett Herald “Corporate Citizenship Award 2014-2018” - Puget Sound Business Journal “Raymond James 2020 Community Bankers Cup Award”

Loan Composition Loan Composition Loan Concentrations by County 61.0% of loans (measured by dollar amount outstanding) were secured by real estate, and 88% were made to borrowers who live or conduct business, in the Puget Sound region $31.8 million legal lending limit as of September 30, 2020 Commercial & Industrial (“C&I”) Portfolio $589.2 million total C&I loans $452.8 million in PPP C&I loans $136.4 million in other C&I loans $461.3 million of Small Business Administration “SBA” loans in C&I portfolio Commercial Real Estate (“CRE”) Portfolio $806.1 million total CRE loans 340% regulatory aggregate CRE to total risk-based capital (1) $4.8 million of SBA 504 loans in portfolio 1-4 Family Real Estate Portfolio $121.1 million total 1-4 family loans $17.9 million purchased from financial institutions, all of which were individually re-underwritten (1) Calculated on Bank-level Tier 1 Capital + Allowance for Loan Losses as of September 30, 2020 Note: Data as of and for the quarter ended September30, 2020 unless otherwise indicated. Overall Loan Portfolio 2.37 years weighted average reprice 5.46 years weighted average maturity Investor Real Estate 35.1% Owner Operated Businesses 56.6%

Deposit Composition Deposit Composition Core Deposit Driven Funding Core Deposit Franchise We define core deposits as total deposits less time deposits, BaaS deposits, and brokered deposits 84.2% of total loans were funded with core deposits as of September 30, 2020 Core deposits were 93.4% of total deposits as of September 30, 2020 Cost of total deposits was 0.27% for the quarter ended September 30, 2020 versus 0.64% for the quarter ended September 30, 2019, and 0.35% for the quarter ended June 30, 2020 Deposit rates were lowered and most rate changes were effective March and April 2020 No internet-sourced deposits Ability to use funding from BaaS program Emphasis on core deposits has helped generate an attractive funding mix Note: Data as of and for the quarter ended September 30, 2020 unless otherwise indicated. Core Deposits 93.4% (1)

Strong Asset Quality Asset Quality Trends NPAs / Assets (%), NPLs / Loans (%) and NCOs / Avg. Loans (%) Allowance for Loan Losses (“ALLL”) / NPLs (%) Note: Data as of and for the year ended December 31 of each respective year unless noted otherwise

Historic Profitability and Efficiency Net Income and Return on Average Assets (assets for Q3 2020 include $452.8 million in PPP loans) Net Income ($mm) Efficiency Ratio (%) and Noninterest Expense (“NIE”) to Average Assets (%) (assets for Q3 2020 include $452.8 million in PPP loans) ROAA(%) Efficiency Ratio (%) NIE / Average Assets (%) Note: Annual data is as of and for the year ended December 31 of each respective year. Quarterly data is as of or for the three months ended September 30 of each respective year. Adjusted to exclude the impact of deferred tax asset revaluation due to the enactment of the Tax Cuts and Jobs Act. Refer to “Non-GAAP Reconciliation” in the Appendix for additional details. (1)

Recent Developments 2020 Q3 Financial Results: Balance Sheet As of the quarter ended (Dollars in millions, except per share amounts) September 30, 2020 June 30, 2020 September 30, 2019 Total Assets $1,749.6 (1) $1,679.0 (1) $1,090.1 Total Loans (1) $1,509.4 (1) $1,447.1 $874.1 Total Deposits $1,360.0 $1,306.4 $922.2 Total Shareholders’ Equity $135.2 $131.0 $120.4 Book Value Per Share $11.34 $10.98 $10.11 For the three months ended September 30, For the nine months ended September 30, Earnings 2020 2019 2020 2019 Net Income (Dollars in millions) $4.1 $3.5 $10.5 $9.6 Basic Earnings Per Share $0.34 $0.30 $0.88 $0.81 Return on Average Assets 0.95% (1) 1.35% 0.96% (1) 1.27% Pre-Tax, Pre-Provision Return (2) on Average Assets 1.72% (1) 1.95% 1.73% (1) 1.83% Provision for Loan Losses (Dollars in thousands) $2,200 (3) $637 $5,708 (3) $1,724 (1) Includes $452.8 million in PPP loans in the third quarter of 2020 and $438.1 million in PPP loans in the second quarter of 2020 (2) Pre-Tax, Pre-Provision return on average assets is a non-GAAP measure that excludes the impact of the provision for income taxes and loan losses from return on average assets. Please refer to non-GAAP reconciliation in the Appendix for additional details (3) Increased provision for loan losses in the first three quarters of 2020 compared to comparable periods of 2019 due to the COVID-19 pandemic

CCBX Division introduced January 27, 2020. Provides Banking as a Service (“BaaS”) enabling broker dealers and digital financial service providers to offer their clients banking services. The “X” is indicative of the technology services that our partners provide. Fintech Partners – As of September 30, 2020, we have four active partners, one in friends and family trials, four in onboarding/implementation, two signed LOI’s, and a solid pipeline of potential new relationships. Infrastructure – We hired support staff to build infrastructure and are making additional hires in 2020 for new partners. The investments we are making today are not for immediate returns but for longer-term returns that we believe will build value for shareholders while benefiting our customers, employees, and communities that we serve. We entered into an agreement with a Fintech and made an investment in them to build a standardized platform to allow us to more profitably deliver BaaS to Fintechs desiring standardized banking services for their customers. Cost – As we build out CCBX, we will do our best to cover related costs with new revenues from CCBX customers. These hires are investments in our future and necessary to perform the services safely and soundly and to manage the risks associated with this line of business. Risk – We hired a Chief Risk Officer and Data Scientist/Architect with PhD in Artificial Intelligence to perform services safely and soundly. We also recently announced that we are building an integrated compliance and reporting system to monitor and address these risks through an investment and contractual agreement with Neocova. Although we carefully underwrite and complete extensive due diligence of each partner, we know that all of partners may not be successful, and like any new business some might fail. Through ongoing monitoring of each relationship, we believe that we will be able to minimize any impact, but recognize that income streams may diminish should a partner fail. Compliance – We are very cognizant of both our compliance responsibility and the True Lender Doctrine, and should any of our partners offer lending products, the Bank will be the True Lender and engage with the relationships accordingly. Financial Reporting – Starting with the fourth quarter 2019, we have changed references made to “wholesale” and "wholesale banking services" to "BaaS" and “BaaS fees.” Asset Growth – Some of our fintech contracts include lending products which, if successful, may potentially lead to additional loan growth beyond the community bank’s organic growth, use of funding from partners, increased utilization of capital, and additional growth in assets.

Coastal’s Digital Bank Through Collaboration With Google Coastal’s collaboration with Google is anticipated to be a great avenue for us to reach existing customers, our communities, and expand to new communities in the coming years. We expect that the new platform will provide customers with an enhanced customer experience and provide them with new avenues to interact with us. With a projected launch in 2021, the Google banking platform will give Coastal the opportunity to tap into a younger demographic and offer consumer products to further diversify our customer base. Why is this important? Already this year, we have seen community banks launch their own stand-alone digital bank (like Incredible Bank and Rising Bank). Banks must reinvent by pursuing a new strategic focus, building new expertise and establishing new ways of working in order to survive.

Appendix

Selected Year-End Financials Refer to “Non-GAAP Reconciliation” in this Appendix for additional details. Share and per share amounts are based on total common shares outstanding, which includes common stock and nonvoting common stock. Tangible book value per share is a non-GAAP measure. Since there is no goodwill or other intangible assets as of the dates indicated, tangible book value per share is the same as book value per share as of each of the dates indicated.

Non-GAAP Reconciliation – 2017 Adjusted Measures Some of the financial measures included in this presentation are not measures of financial performance recognized by GAAP. Our management uses the non-GAAP financial measures set forth below in its analysis of our performance for 2017 to exclude the impact of a deferred tax asset revaluation due to the enactment of the Tax Cuts and Jobs Act. “Adjusted net income” is a non-GAAP measure defined as net income increased by the additional income tax expense that resulted from the revaluation of deferred tax assets as a result of the reduction in the corporate income tax rate under the recently enacted Tax Cuts and Jobs Act. The most directly comparable GAAP measure is net income. “Adjusted earnings per share” is a non-GAAP measure defined as net income, plus additional income tax expense as noted above, divided by weighted average outstanding shares (diluted). The most directly comparable GAAP measure is earnings per share. “Adjusted return on average assets” is a non-GAAP measure defined as net income, plus additional income tax expense as noted above, divided by average assets. The most directly comparable GAAP measure is return on average assets. “Adjusted return on average shareholders’ equity” is a non-GAAP measure defined as net income, plus additional income tax expense as noted above, divided by average shareholders’ equity. The most directly comparable GAAP measure is return on average shareholders’ equity. Share and per share amounts are based on total common shares outstanding, which includes common stock and nonvoting common stock. These amounts have been adjusted to give effect to a one-for-five reverse stock split of common shares completed effective May 4, 2018.

Selected Quarterly Financials Share and per share amounts are based on total common shares outstanding, which includes common stock and nonvoting common stock. Tangible book value per share is a non-GAAP measure. Since there is no goodwill or other intangible assets as of the dates indicated, tangible book value per share is the same as book value per share as of each of the dates indicated.

Non-GAAP Reconciliation – Pre-Tax, Pre-Provision Some of the financial measures included in this presentation are not measures of financial performance recognized by GAAP. The following non-GAAP measures are presented to illustrate the impact of provision for loan losses and provision for income taxes on net income and return on average assets.   “Pre-tax, pre-provision net income” is a non-GAAP measure that excludes the impact of provision for loan losses and provision for income taxes from net income.  The most directly comparable GAAP measure is net income.   “Pre-tax, pre-provision return on average assets” is a non-GAAP measure that excludes the impact of provision for loan losses and provision for income taxes from return on average assets.  The most directly comparable GAAP measure is return on average assets.   Reconciliations of the GAAP and non-GAAP measures are presented below.  

Non-GAAP Reconciliation – 2020 PPP Loans Impact The following non-GAAP financial measures are presented to illustrate and identify the impact of PPP loans, PPPLF borrowings, customer deposits from PPP loans, and related earnings and expenses. By removing these significant items and show what the results would have been without them we are providing investors with the information to better compare results with periods that did not have these significant items. These measures include the following: “Adjusted allowance for loan losses to loans receivable” is a non-GAAP measure that excludes the impact of PPP loans on balance sheet. The most directly comparable GAAP measure is allowance for loan losses to loans receivable. “Adjusted yield on loans receivable” is a non-GAAP measure that excludes the impact of PPP loans on balance sheet. The most directly comparable GAAP measure is yield on loans. “Adjusted contractual yield on loans receivable, excluding earned fees and interest on PPP loans” is a non-GAAP measure that excludes the impact of PPP loans on balance sheet. The most directly comparable GAAP measure is contractual yield on loans, excluding fees. Reconciliations of the GAAP and non-GAAP measures are presented below.

Diverse Loan Portfolio CRE Loan Breakdown as % of Total Outstanding Balances and Available Commitments (Excludes PPP Loans) C&I Loan Breakdown as % of Total Outstanding Balances and Available Commitments (Excludes PPP Loans) Construction/Land Loan Breakdown as % of Total Outstanding Balances and Available Commitments (Excludes PPP Loans)

Loan Portfolio Statistics (1) (1) (2) (2) (3) (3) Based on best available data. If a loan has multiple guarantors, FICO score represented is highest of the guarantors. FICO scores are based off origination unless updated through annual term loan review or other credit action. Loan to Value (“LTV”) data is based on best available data. LTV at origination is used unless updated information was made available through an annual term loan review or other credit action. Debt Service Coverage Ratio (“DSCR”) data is based on best available data. DSCR at origination is used unless updated information was made available through an annual term loan review or other credit action. (1) Source: https://www.statista.com/statistics/206546/us-hotels-occupancy-rate-by-month/ Most current data as of September 30, 2020 unless noted otherwise (1) (1) (2) (2) (3) (3) The Bank’s hotel portfolio predominantly consists of travel hotels/motels and as such our occupancy rates are higher than the national average. (1)

COVID-19 Update – Washington’s Phase Recovery Approach (1) (1) As of October 27, 2020 Source: https://www.governor.wa.gov/sites/default/files/SafeStartPhasedReopening.pdf Phase 2: King, Kitsap, Pierce, Skagit, and Snohomish Phase 3: Island and Thurston