Additionally, it saw the arrival of Nicholls State University, who originally planned to join the TAAC as a full member.

To get around this, the TAAC announced that Nicholls State would compete as a provisional member, ineligible for the men's basketball tournament until it completed its D-I transition in 1985.

However, near the end of the decade, the conference was hit with 5 departures over 4 consecutive years, beginning with Houston Baptist transitioning to the NAIA in 1989.

The start of the 2010s gave the A-Sun a bit of a reprieve from conference realignment, losing only Campbell and Belmont in 2011 and 2012 to the Big South and OVC, respectively, and only adding recent D-I upgrader Northern Kentucky University in 2012.

The ASUN continued to expand and contract slowly through the mid-2010s, losing only Northern Kentucky and East Tennessee State (along with Mercer), and only adding the New Jersey Institute of Technology in 2015.

[8] On July 1, 2024, the University of West Georgia joined from the Division II Gulf South Conference.

[9] On January 22, 2020, it was announced that the Coastal Collegiate Sports Association and the ASUN would merge to create a new Division I multisport conference.

[12] However, with these three schools joining in 2021, the league partnered with another conference beginning to sponsor football also in 2022, the Western Athletic Conference (WAC), to allow the three teams to join the WAC as football affiliates for 2021, branding it interchangeably as the "ASUN–WAC Challenge" and "WAC–ASUN Challenge"; the two leagues will receive a combined bid to the FCS playoffs.

Liberty was also invited to C-USA for 2023, but had already competed as an FBS independent for some time and was not included in the ASUN's new football league.

[15] With the WAC also losing Sam Houston, another football-sponsoring school, to C-USA, the two conferences announced they would be renewing their alliance for the 2022 season.

[16] On September 17, 2021, the ASUN announced Austin Peay State University, a football-sponsoring school, as a new member for the 2022–23 season.

Akron and Kent State left after the 2020 season when their full-time home of the Mid-American Conference began sponsoring the sport.

Full member Bellarmine was joined by five new associates—Air Force, Cleveland State, Detroit Mercy, Robert Morris, and Utah.

Charleston, Stephen F. Austin, and UNC Wilmington all left the ASUN after a single season and Mercer also moved beach volleyball to the SBC.

On October 14, 2022, Conference USA and Kennesaw State jointly announced that KSU would start a transition to FBS after the 2022 football season[22] and join C-USA in 2024.

[23] ESPN reported on December 9, 2022, that the ASUN and WAC had agreed to form a new football-only conference that plans to start play in 2024.

The ASUN added men's and women's swimming & diving for the 2023–24 season, taking most of its initial membership from the Coastal Collegiate Sports Association, which had been founded as a partnership of several all-sports conferences, including the ASUN, as a home for that sport (the CCSA's scope would later expand to include beach volleyball).

Two associate members came from the American Athletic Conference, which dropped men's swimming as a sponsored sport after the 2022–23 season.

For the past several years, the ASUN's Commissioner has served as the president of what was initially a swimming & diving-only conference.

[46] North Alabama joined Big South football under the terms of this agreement; although the school's home state of Alabama had no schools in either conference at the time it was announced as a future ASUN member, three of its neighboring states were home to six of the ASUN's eight members at that time.

[47] At a press conference on February 23, 2021, the ASUN announced that it had entered into a separate football partnership with the Western Athletic Conference (WAC), which had previously announced the relaunch of its football league at the FCS level in fall 2021 with the arrival of four new FCS member schools.

Both conferences proposed an amendment to NCAA bylaws that would allow the alliance to receive an automatic bid to the FCS playoffs.

[48][14] The two leagues' proposal was successful, resulting in an automatic qualifier from the seven-team Challenge, colloquially dubbed "AQ7".

[50][51] This arrangement was scrapped along with the planned conference split once NJIT left for the America East; the men's lacrosse league is now directly administered by the ASUN.

Lindenwood, which started a transition from D-II to D-I in 2022 as a new member of the Ohio Valley Conference, became an affiliate in both men's and women's lacrosse (neither of which is sponsored by the OVC).