Semakin meluasnya kebutuhan jasa profesional akuntan publik sebagai pihak yang independen, profesi akuntan publik diharapkan memiliki kompetensi yang memadai untuk dapat mempertahankan kepercayaan klien dan para pemakai laporan keuangan lainnya. Dalam melaksanakan audit atas laporan keuangan, auditor tidak dapat memberikan jaminan mutlak bagi klien atau pemakai laporan keuangan lainnya bahwa laporan keuangan auditan adalah bebas dari salah saji material. Penelitian ini bertujuan untuk mengetahui apakah ada pengaruh profesionalisme, pengalaman, dan etika profesi terhadap pertimbangan tingkat materialitas, yaitu besarnya salah saji yang dapat mempengaruhi keputusan pemakai informasi. Jumlah sampel yang digunakan sebanyak 32 orang auditor dari 5 perusahaan, teknik penentuan sampel menggunakan purposive sampling. Pengumpulan data dilakukan dengan metode survey melalui penyebaran kuesioner. Teknik analisis yang digunakan adalah regresi berganda. Berdasarkan hasil pengujian secara parsial, pengalaman , etika profesi dan profesionalisme berpengaruh secara signifikan terhadap pertimbangan tingkat materialitas

Financial performance can provide an overview of past performance and future prospects of a company. Many companies carry out business activities related to nature but do not disclose sustainability reports. Companies that have a large company size should disclose more information than small companies, including disclosures about the implementation of Corporate Governance and sustainability reports disclosure. With these disclosures of information, it is expected to increase public trust in the company and improve the company's financial performance. This research aims to obtain evidence that company size and Corporate Governance influence financial performance, and the role of Sustainability Report disclosure as mediating the relationship between these variables in nine state-owned enterprises and the mining sector for five years (2013-2017). The results of this study indicate that (1) company size has effects on financial performance; (2) audit committee has effects on financial performance; (3) the board of directors does not affect financial performance; (4) company size has not affect the disclosure of sustainability report; (5) the audit committee has not affect the disclosure of sustainability report; (6) the board of directors has effect the disclosure of sustainability report; and (7) Sustainability Report disclosure can’t mediate the influence between company size/Corporate Governance on financial performance.