Here's a breakdown of planets in our solar system and their known moon counts:

Planets with Less than 15 Moons:

* Mercury: 0 moons

* Venus: 0 moons

* Earth: 1 moon

* Mars: 2 moons

* Jupiter: 79 moons (more than 15)

* Saturn: 82 moons (more than 15)

* Uranus: 27 moons

* Neptune: 14 moons

Conclusion:

Only Mercury, Venus, Earth, Mars, and Neptune have less than 15 known moons.

Keep in mind that our understanding of the solar system is constantly evolving, so new moons could be discovered in the future!