Recent developments at the Joint Stock Oil and Gas Service Company (Petrosetco) have caught the attention of investors. Five key leaders at the company, listed on the Ho Chi Minh Stock Exchange (HOSE) under the ticker symbol 'PET', have registered to sell their entire stock holdings. This move comes as the share price returns to a three-year high. In contrast, HDCapital has emerged as a significant shareholder, acquiring 15.3 million PET shares on July 28.