Material Event (Form 8-K)

On June 15, 2026, HA Sustainable Infrastructure Capital, Inc. a Delaware corporation (the "Company") commenced, subject to market conditions, a private offering (the "Offering") of green senior unsecured notes (the "Notes"). At issuance, the Notes will be guaranteed by Hannon Armstrong Sustainable Infrastructure, L.P., Hannon Armstrong Capital, LLC, HAT Holdings I LLC, HAT Holdings II LLC, HAC Holdings I LLC and HAC Holdings II LLC.

In connection with the Offering, the Company distributed a preliminary offering memorandum which included the following Company update:

Company Overview

We are an investor in sustainable infrastructure assets advancing the energy transition. With over $16 billion in Managed Assets as of March 31, 2026, our investment strategy is focused on actively partnering with clients to deploy capital primarily in income-generating real assets that are supported by long-term recurring cash flows. This strategy has enabled us to generate attractive risk-adjusted returns and provide stockholders with diversified exposure to the energy transition.

We are internally managed by an executive team that has extensive relevant industry knowledge and experience, and a team of over 170 full-time investment, operating, and technical professionals. We have long-standing, programmatic relationships with some of the leading U.S. clean energy project developers, owners and operators, utilities, and energy service companies ("ESCOs"), which provide recurring, programmatic investment and fee-generating opportunities, while also enabling scale benefits and operational and transactional efficiencies. Partnering with these clients, we are able to earn attractive risk-adjusted returns by investing in a variety of asset classes across our three primary climate solutions markets:

Through December 31, 2025, we have cumulatively closed more than 1,300 investments spanning more than 150 different clients since 1998. We believe we have achieved success as a leading pure play publicly-traded investor in sustainable infrastructure assets because of a number of differentiating qualities that we believe provide us with a competitive advantage in the market. The first such quality is our prioritization of long-term client relationships over individual transactions, as well as our explicit strategic decision never to compete with our clients, which differentiates us from many competing capital providers. The second is our access to permanent capital, which enables a degree of flexibility and creativity in structuring new investments that we believe clients find valuable. The third is our ability to nimbly invest in smaller transaction sizes across the capital structure which results in more investment opportunities than competing capital providers. The fourth such quality is our multi-decade experience in investing in our target end markets, and the unique technology, policy, taxes, incentives and investment structures that characterize such markets. We believe we have demonstrated the resilience of our business to grow assets and earnings and to generate attractive returns through multiple interest rate cycles and economic cycles. Together, these qualities not only differentiate us in the marketplace and add strategic value to our clients but also enable operational and transactional efficiencies that enhance our ability to earn attractive risk-adjusted returns on the assets in which we invest.