I’d be interested in a breakdown of the box office for these films.

Ask and ye shall receive.

• Venom (2018)
  • Budget: $100-116 million
  • Box office: $856,085,161
• Venom: Let There Be Carnage (2021)
  • Budget: $110 million
  • Box office: $506,863,592
• Morbius (2022)
  • Budget: $75-83 million
  • Box office: $1 morbillion $167,460,961
• Madame Web (2024)
  • Budget: $80 million
  • Box office: $100,498,764
• Venom: The Last Dance (2024)
  • Budget: $120 million
  • Box office: $472,812,792

So, in total, Sony spent $485-509 million on all the films, and they have made a combined $2.1 billion.

The highest grossing SSU film was the first Venom movie, and they seem to have been chasing that high ever since. Their lowest-grossing movie (so far) is Madame Web.

So it appears that over time, the SSU movies have been making less and less money with each release (with the exception of Venom 3).