In Jainism, the Navkar Mantra (also known as the Namokar Mantra or Navkar Mantra) is the most fundamental and revered prayer. It pays homage to the five supreme beings:

1. Arihant — Perfected souls who have conquered inner passions and attained omniscience.
2. Siddha — Liberated souls, free from the cycle of birth and death.
3. Acharya — Head monks who lead the Jain congregation.
4. Upadhyaya — Teachers of scriptures.
5. Sadhu (Muni) — Monk followers who practice self-discipline and renunciation.

Adhishtayak refers to the presiding or ruling entity, or the object of focus/concentration in a prayer. In the context of the Navkar Mantra, the adhishtayak are the five supreme beings mentioned above: Arihant, Siddha, Acharya, Upadhyaya, and Sadhu.

The mantra does not directly mention any specific name or individual, nor does it include any request for favors or material gain. Instead, it is a salutation (namaskar) to these five supreme beings, expressing reverence for their virtues and seeking inspiration to follow their path towards liberation (moksha).

Summary: The adhishtayak (presiding entities) of the Navkar Mantra in Jainism are:

• Arihant
• Siddha
• Acharya
• Upadhyaya
• Sadhu

Chanting the Navkar Mantra is believed to purify the mind, remove karmic obstacles, and guide the devotee towards spiritual upliftment by remembering and venerating these five supreme beings.