Kyivstar (Ukrainian: Київстар) is a Ukrainian telecommunications operator offering fixed and mobile voice and data services, including 4G LTE, throughout Ukraine. The Kyivstar mobile network covers all cities of Ukraine, as well as more than 28,000 rural settlements, all major national and regional routes, most sea, and river coasts. As of 2024, Kyivstar served approximately 24 million mobile subscribers and over 1 million fixed-broadband (‘Home Internet’) customers. In 2024, Kyivstar partnered with Starlink to offer satellite-based messaging and broadband in Ukraine. In August 2025, Kyivstar became the first U.S.-listed Ukrainian company.

PJSC Kyivstar was registered in Ukraine in 1994 and commenced mobile‐telephony operations in 1997. The company's head office is located in Kyiv. Kyivstar is a part of the international telecom group VEON. Oleksandr Komarov has been the President of the company since December 2018.

In 2022, Kyivstar, together with other mobile operators, the Ministry of Digital Transformation of Ukraine, the State Service for Special Communications and Information Protection of Ukraine, the National Commission for State Regulation in the Fields of Electronic Communications, Radio Frequency Spectrum and Postal Services, together with the Ukrainian Association of Telecom Operators "Telas", launched national roaming.

In December 2024, Kyivstar announced that it had signed an agreement with Elon Musk’s Starlink to introduce direct-to-cell satellite connectivity for its subscribers in Ukraine. Subsequently, in July 2025 Kyivstar confirmed that the partnership with Starlink’s LEO satellite constellation would enable over-the-top messaging by the end of 2025, with mobile satellite broadband and voice services to follow in mid-2026. The service makes Ukraine one of the first countries to have the Starlink direct-to-cell service.

Since 2025, the company has expanded into digital health, ride-hailing, delivery, and cloud-computing services. Its subsidiaries include Helsi, Ukraine’s digital health platform, Uklon, Ukraine’s ride-hailing and delivery platform, and its big data and cloud services, supporting 500 business clients.

On March 18, 2025, Kyivstar signed a business combination agreement with Cohen Circle Acquisition Corp (CCIR). On August 15, 2025, Kyivstar started trading on the NASDAQ Stock Exchange in the United States as the first U.S.-listed Ukrainian company. It is trading under the ticker symbol KYIV, replacing CCIR. Its parent company, VEON, retained and locked up nearly 87% of its shares, leaving less than 11% available for public shareholders.

Since Russia’s full-scale invasion on 24 February 2022, Kyivstar implemented a series of measures to support its customers and the Ukrainian public.

During February and March 2022, in cooperation with the State Emergency Service of Ukraine, Kyivstar sent over 150 million SMS alerts detailing air-raid procedures and basic first-aid instructions. In the first quarter of 2022, Kyivstar invested UAH 659 million in communication development. The company built hundreds of new mobile communication facilities and connected 1,150 bomb shelters in various cities of Ukraine to free Internet. Thanks to the round-the-clock work of the company's specialists, 95% of the base stations of the telecom network operated normally. Kyivstar provided emergency credit and free communication services to customers, including refugees in neighboring countries. It extended business-client payment deadlines and offered some services for free.