This is the 14596th most frequent Turkish word.
personellerine
"To their staff/personnel."
In this sentence, 'personellerine' means 'to its employees', referring to the personnel of the company and indicating the indirect object of the action.
Şirket, personellerine yeni ofis malzemeleri dağıttı.
The company distributed new office supplies to its employees.
Here, 'personellerine' stands for 'to the staff'. It shows that the action of thanking is directed toward the staff members.
Okul müdürü, personellerine teşekkür etti.
The principal thanked the school staff.
This usage of 'personellerine' implies 'to its employees', highlighting the recipient of the announcement made by the firm.