*RB DaJuan Cofield, San Jose State
RB Jewel Hampton, Southern Illinois
FB Cameron Bell, Norther Illinois
*WR Chris Owusu, Stanford
WR Nathan Palmer, Northern Illinois
WR Brian Tyms, Florida Atlantic
TE Garrett Celek, Michigan State
OL David Gonzales, Washington State
OL Kevin Murphy, Harvard
OL Al Netters, Northwestern
*DE Matthew Masifilo, Stanford
DE Kourtnei Brown, Clemson
DE Tony Jerod-Eddie, Texas A&M
DT Patrick Butrym, Wisconsin
OLB Joe Holland, Purdue
CB Anthony Mosley, Kentucky
*S Michael Thomas, Stanford
*DB/KR Deante' Purvis, UNLV
*K Giorgio Tavecchio, Cal
*-participated in 49ers' local pro day on April 19.
Doesn't look like Stanford CB Johnson Bademosi signed or isn't known if signed/agreed to sign.
If my math is correct that is 19 signings.