Pengaruh Covid-19 Terhadap Imbal Hasil Saham Perusahaan Sektor Kesehatan, Teknologi, Keuangan, Transportasi, dan Logistik yang Terdaftar di Bursa Efek Indonesia Periode Januari-Mei 2020 = Impact of Covid-19 on Stock Return of Healthcare, Technology, Finance, Transportation, and Logistic Sector Companies Listed on Indonesia Stock Exchange in January-May 2020