In an open letter to Liverpool fans, board members John Henry, Tom Werner and Mike Gordon reflected on the landmark.
"When we first became involved with Liverpool, we knew we were joining something extraordinary and we hoped we could restore such an incredibly storied institution to standards it had previously set - but we could never have imagined exactly how the next 15 years would unfold.
"From the outset, our primary aims were simple: to bring success back to Anfield and to ensure the long-term health and stability of this great club. We understood the responsibility that came with being its custodians, and we’ve tried to honour that every single day. We also understood the scale of the challenge but recognised the potential that could be realised if everyone pulled in the same direction.
"Looking back now, it’s not only been quite a journey; it’s also been an incredible adventure that we, as owners, have been privileged to be a part of.
"The two Premier League titles - one under Jürgen and one under Arne - and the Champions League win are the obvious milestones. We will never forget being inside Anfield earlier this year on the day we were finally able to lift that league trophy in front of our fans. It is a memory that will stay with us for life.
"But there have been so many other moments that matter just as much. Sir Kenny Dalglish guiding us to our first trophy together in 2012. Becoming world champions in 2019. The cup double in 2022. The League Cup final in 2024. Back-to-back WSL title wins in 2013 and 2014 under Matt Beard. Each of them told its own story about what this club stands for - belief, togetherness, heart and so much passion.
"Of course, there have been tough times too. We’ve lost finals and missed out by the smallest of margins. Off the field, there have been times we’ve got things wrong. We know that and we have learned from it. All our decisions are made with the best, long-term interests of the club at the centre of our thinking.
"Today is a day to look back with gratitude. But it’s also a reminder that our work isn’t done. There’s still so much more ahead of us - more to achieve, more to win, and more memories to make, together.
"And to you, our supporters - on behalf of everyone at Fenway Sports Group - thank you. Thank you for welcoming us, for believing in this team through every high and low, for telling us when we’ve fallen short, and for showing the world what it truly means to be part of Liverpool Football Club.
"You’ll Never Walk Alone,
"John, Tom and Mike."