The InvestEU Programme is a strategic initiative designed to support investment across the European Union (EU) through a policy-driven and market-based approach. It has three components: the InvestEU Fund, the InvestEU Advisory Hub, and the InvestEU Portal. The InvestEU Fund leverages an EU budgetary guarantee of EUR 26.2 billion to enhance the risk-taking capacity of Implementing Partners (IPs), enabling them to expand their financing for investments aligned with EU policy objectives. The InvestEU Advisory Hub focuses on enhancing the quality and readiness of investment projects while fostering the development of investment ecosystems. The InvestEU Portal aims to improve the visibility and accessibility of investment opportunities within Europe, making it easier for investors to find and support promising projects. Structured around four policy windows, InvestEU supports specific sectors and activities aligned with EU policy objectives: the Sustainable Infrastructure Window (SIW), the Research, Innovation, and Digitalisation Window (RIDW), the Small and Medium-sized Enterprises Window (SMEW), and the Social Investment and Skills Window (SISW). With a sharp policy focus, particularly on the green transition, InvestEU dedicates substantial funds to climate and environmental projects, and supports green finance through taxonomy-inspired financial products such as the Sustainability Guarantee. InvestEU introduces several novel features. It unifies 13 previous EU financial instruments and a budgetary guarantee, as well as 13 previously separate advisory support initiatives into a single, cohesive investment support programme. While the European Investment Bank (EIB) Group remains the main partner, implementing 75% of the EU budgetary guarantee and the Advisory Hub budget, InvestEU’s open architecture also welcomes National Promotional Banks and Institutions (NPBIs) and International Financial Institutions (IFIs), broadening collaboration and expertise. InvestEU also allows for a number of blending options, such as top-ups from other EU programmes to InvestEU financial products, to address entrenched market failures or sub-optimal conditions in specific sectors. The introduction of Member State compartments (MS-Cs) allows Member States to transfer part of their cohesion funds, resources from their RRF funds, or their own resources to InvestEU. This enables them to address specific national priorities and needs while benefiting from the EU guarantee.