Angielsko-polski słownik potocznego języka businessu Copyright by Wydawnictwo HaraldG (aut. Bożena Hoszowska)
(n) (of stock / share prices) a price which is movingvery little, teding to be unaffected by changes in market condition - (o cenach akcji) cena stała / sztywna / ustalona
This is definitely not a swooner as its price seems to be rather sticky.