Solutions for Today’s Challenges. Vision for Tomorrow’s Opportunities.

Join William Blair, the Premier Global Partnership.

Madrid Investment Banking Internship - October 2026 through March 2027

About the Team

Our M&A; advisory practice offers comprehensive financial advisory services and expert guidance. We serve buyers and sellers by providing in-depth financial and strategic analysis, identifying transaction partners, developing creative deal structures, and negotiating complex transaction terms. Our leadership position in the middle market and strong transaction activity enable us to clear the market globally in search of the best transaction partners.

Our bankers are true experts in their sectors and deeply understand the competitive landscape and deal environment facing our clients.

Take the opportunity to build on the fundamentals of your academic background, gain practical knowledge to help prepare you for your next steps and be part of an organization that fosters innovation and invests in our most important asset, our people.

Job Summary & Responsibilities

We are offering talented students and recent graduates an exciting opportunity to work in the demanding field of Investment Banking (Mergers & Acquisitions) for a six-month internship from October 2026 - March 2027 in our Madrid office. This is a fantastic opportunity to become an integral part of our team and gain live experience working for a integral investment bank. Our program provides all interns with the unique opportunity to:

- Work alongside current Analyst, Associate, and VP over the course of six months
- Take on all functions of a full-time analyst
- Assist deal teams in live transactions
- Perform financial due diligence, research, analysis, and documentation of potential and live transactions




- Receive direct client exposure in a culture of collaboration and accountability
- Draft pitch materials, information memorandums, management presentations, and other relevant communications
- Identify potential M&A; and financing situations

Qualifications

- Exceptional academic credentials, with a degree qualification (completed or on-going) from a top-tier institution
- Bachelor’s and master’s degree: all subjects considered
- General understanding of accounting and finance principles
- Strong analytical and communication skills
- Ability to work well under pressure and strong attention to detail
- High level of motivation and ability to work in a team
- Adaptability to a constantly changing environment and ability to manage through change with a high degree of emotional maturity
- Intellectual curiosity and a passion for investment banking
- Strong proficiency with MS-Office, particularly PowerPoint and Excel
- Ability to collaborate across multiple functions, adapt to new tasks with little notice, and to work on multiple projects simultaneously
- Fluency in English and Spanish is essential
- Fluency in any other European language is highly desired with Italian preferred

Additional Information

- This internship will last for six months from the beginning of October 2026
- Successful interns will be considered for full-time Analyst positions
- Please visit our Careers page to learn more about William Blair
- We encourage you to apply as soon as possible as applications will be reviewed on a rolling basis

Application Process

- Application window is open until 30th August 2026
- Those eligible will be asked to complete an online assessment run by our assessment partner, SHL
- Interviews & Assessment centres, either in person or virtual, will be completed by the middle of September 2026
- The 6-month Internship run between October 2026 – March 2027

📌 Madrid Investment Banking Intern - October 2026
🏢 William Blair
📍 Madrid