Beckham, Richburg, Kennard and Jackson join Andre Williams and Nat Berhe as picks the Giants have inked.
Now, only third-round pick Jay Bromley is the unsigned pick from the draft.
All rookie deals are for the standard four years with the exception of Beckham's, who as a first round selection, receives a fifth-year team option.
According to the website Spotrac.com, Beckham's contract is worth four years, $10.4 million. He is only the fourth first-round selection from this year's NFL Draft under contract to date. Oakland's Khalil Mack (5th overall), Chicago's Kyle Fuller (14th) and New Orleans' Brandin Cooks (20th) are the others. Beckham was taken 12th overall by the Giants.
No details have been released on the Richburg deal. Other deals: Williams was inked to four years, $2.6736 million; Berhe four years, $2.412 million and Kennard four years, $2.364 million. Jackson's deal is reportedly four years, $2.33 million.
From the Giants:
At LSU, Beckham claimed the 2013 Hornung Award as college football’s most versatile player and earned first-team All-America honors as a junior last year as both a kick returner (Football Writers Association of America) and return specialist (CBSSports.com). Beckham also set the LSU record and finished second in SEC single-season history with 2,315 all-purpose yards in 2013, completing his career with 15 touchdowns and 4,118 all-purpose yards, which rank No. 5 in LSU history.
Richburg finished his career at Colorado State in 2013 as a four-year starter who recorded 50 consecutive starts, never missing a game, and setting the school record for career starts (50). He was named first-team All-Mountain West in 2013 after earning honorable mention in 2012 and second-team honors in 2011 as a sophomore.
Kennard played both defensive end and outside linebacker at USC, and his father, Derek, was an All-America offensive lineman at Nevada who played 11 seasons in the NFL with the Cardinals, Saints, and Cowboys, including the 1995 Dallas team that won the Super Bowl.
Originally arriving at Notre Dame as a wide receiver, Jackson started all 13 games on defense for the Irish in 2013, registering 64 tackles, three pass breakups and two interceptions with five tackles for loss and one forced fumble. He scored his first touchdown for the Irish on a 34-yard interception return against Purdue. Jackson was one of the Giants’ five draft choices who were team captains last season. Richburg, Bromley, Berhe, and Kennard were the others.