Many studies have ignored the role of audit quality and institutional investors in stock price concurrency. Considering the great influence of institutional investors on stock prices, we assume that institutional investors have a high correlation with stock price concurrency. A financial and capital market characterized by a weak information environment is associated with high stock price synchronicity. Countries with weaker investor protection may also make informed trading more profitable and limit the incorporation of firm-specific information into stock prices. For this purpose, the information related to 90 companies admitted to the Tehran Stock Exchange was collected by systematic elimination sampling method in the period of 1396-1400, and by performing the required tests, it was determined that institutional shareholders and audit quality had a negative effect on the simultaneity of stock prices. Also, audit quality reinforces the negative effect of institutional ownership on stock price concurrency.