During the transfer window, the Cherries captured full-back Adam Smith from Tottenham Hotspur, Yann Kermorgant from Charlton Athletic and former Nottingham Forest goalkeeper Lee Camp, while youngsters Josh O'Hanlon, Ben Whitfield and Jonathan Muleba also moved to the Goldsands Stadium.
Additionally, top goalscorer Lewis Grabban was rewarded with a new three-and-a-half year contract after reportedly attracting interest from a host Championship clubs.
Grabban turned down a move to league rivals Brighton & Hove Albion, instead opting to pen an improved deal with Bournemouth, and Howe admitted his joy with the Cherries' activity during the winter window.
"We were very pleased with the business we did during the month," he told the Daily Echo.
"Keeping our best players is always one of the biggest tests for us and that was always the aim.
"We want to try to build and progress with the squad we have and selling anybody would have been a real negative. It was close with Grabbs but we were delighted to have kept everybody."
Russian businessman Demin has been involved with Bournemouth since 2011 and Howe was thankful of receiving his financial support once again.
"Without Max, we wouldn't be where we are now so he deserves a lot of credit for what he has done to the football club, not just in terms of the money he has spent but the way he conducts his business," he said.
"We are hopeful we can bring success to him long term and repay that faith."