This paper describes the
coefficient multipliers of Hp(0 < p < 1) into lq(p ≦ q ≦∞) and into Hq(1 ≦ q ≦∞).
These multipliers are found to coincide with those of the larger space Bp into
lq(1 ≦ q ≦∞) and into Hq(1 ≦ q ≦∞). The multipliers of Hp and Bv into
Bq(0 < p < 1,0 < q < 1) are also characterized.