McIntosh was the first Canadian woman to win three gold medals at the Paris Olympics, where she won the 200-meter butterfly, 200 individual medley and 400 individual medley at the age of 18. She was also a silver medalist in the 400 meter freestyle.
McIntosh won four gold medals and a bronze medal at the 2025 World Championships in Singapore, where she became the first swimmer to set three world records in a single event since Phelps in 2008.
“Summer has established herself as a generational talent whose appeal extends across Canada and far beyond,” Peter Carlisle, Octagon’s managing director of Olympics, said in a statement Tuesday.
“She is a true star at a range of events unprecedented in women’s swimming and has an engaging and charismatic personality that resonates with consumers, media and brands around the world.
“Summer has a healthy portfolio of corporate partners and we see a long path to sustained competitive success and global commercial growth as she pursues her goals and dreams in and out of the pool.”
McIntosh’s sponsorship deals include Arena, Lululemon, Red Bull, TAG Heuer, RBC and Air Canada.
“I am excited to partner with Octagon as the company has a proven track record of working with many of the world’s leading Olympic athletes,” McIntosh said in the statement.
“They understand how to support my training and competition needs while working with me to develop a long-term strategy that will help me maximize my athletic success. I am fortunate to have a great team of people around me and supportive corporate partners, and adding Octagon to my team will help me continue to pursue my dreams while managing all the demands before (the 2028 Los Angeles Olympics) and beyond.”
McIntosh made her Olympic debut at age 14 in Tokyo, where she finished fourth in the 400-meter freestyle. She has won 13 World Championship medals throughout her career, including eight gold medals.
She was named Canadian Press Female Athlete of the Year in both 2024 and 2025.
The next World Long Course Swimming Championships will take place in Budapest, Hungary in 2027.
This report by The Canadian Press was first published May 26, 2026.
The Canadian Press