Operating Engineers Local 428 Annuity Trust Fund pension plans

Operating Engineers Local 428 Annuity Trust Fund, Phoenix, AZ. EIN 86-6025732. Annual reports 2009–2025. Also filed as Operating Engineers Local No. 428 Annuity Trust Fund; Operating Engineers Local No. 428; Operating Engineers Local. 428 Annuity Trust Fund; Operating Engineers Local 428 Pension Trust Fund.

Operating Engineers Local 428 Annuity Trust Fund has 2 active retirement plans on file. The largest is the Arizona Operating Engineers Pension Plan, with 1,395 participants and $15.0 million in assets in 2025. Southwest Service Administrators has been its administrator since 2023.

Active plans: 2
Participants: 9,580
Plan assets: $328 million
401(k) recordkeeper: Southwest Service Administrators
Plans on file: 2
Industry: Construction

All 2 plans

Active plans first

Arizona Operating Engineers Pension Plan

Pension (defined benefit), frozenActiveUnion (multiemployer)

Active. The plan filed its annual report for the 2025 plan year.

Plan number: 001Employer EIN 86-6025732
Participants (2025): 1,395
Net assets (2025): $15.0 million
Administered by: Southwest Service AdministratorsEarlier: Zenith American Solutions (2012–2022), American Benefit Plan Administrator (2010–2011)
Plan administrator: Arizona Operating Engineers Pension Trust Fund
2550 W Union Hills DR Ste 290
Phoenix, AZ 85027
(602) 249-3582As filed for 2025
In effect since: June 1, 1963

Earlier sponsors: Operating Engineers Local 428 Pension Trust Fund (2010); Operating Engineers Local 428 (2011–2013); Operating Engineers Local 428 Pension Trust (2014–2024).

Earlier plan names: Operating Engineers Local 428 Pension Trust Fund; Operating Engineers Local 428 Pension Trust.

Year by year, 2010 to 2025

Plan year	Participants	Net assets	Recordkeeper
2025	1,395	$15.0 million	Southwest Service Administrators
2024	1,473	$16.6 million	Southwest Service Administrators
2023	1,577	$19.5 million	Southwest Service Administrators
2022	1,638	$21.5 million	Zenith American Solutions
2021	1,714	$29.9 million	Zenith American Solutions
2020	1,819	$31.2 million	Zenith American Solutions
2019	1,884	$32.8 million	Zenith American Solutions
2018	1,971	$32.3 million	Zenith American Solutions
2017	2,059	$39.2 million	Zenith American Solutions
2016	2,155	$38.8 million	Zenith American Solutions
2015	2,231	$41.2 million	Zenith American Solutions
2014	2,194	$46.6 million	Zenith American Solutions
2013	2,338	$50.2 million	Zenith American Solutions
2012	2,317	$47.1 million	Zenith American Solutions
2011	2,380	$47.7 million	American Benefit Plan Administrator
2010	2,492	$46.1 million	American Benefit Plan Administrator

Operating Engineers Local 428 Annuity Trust Fund

Defined contribution planActiveUnion (multiemployer)

Active. The plan filed its annual report for the 2024 plan year.

Plan number: 002Employer EIN 86-6025732
Participants (2024): 8,185
Net assets (2024): $313 million
Recordkeeper: Southwest Service AdministratorsEarlier: Zenith American Solutions (2012–2022), American Benefit Plan Administrator (2010–2011)
Plan administrator: Operating Engineers Local 428 Annuity Trust Fund
2550 W Union Hills DR Ste 290
Phoenix, AZ 85027
(602) 249-3582As filed for 2024
In effect since: January 1, 1985

Earlier sponsors: Operating Engineers Local No. 428 Annuity Trust Fund (2009–2010); Operating Engineers Local No. 428 (2011–2014).

Earlier plan names: Operating Engineers Local No. 428 Annuity Trust Fund; Operating Engineers Local No 428 Annuity Trust Fund.

Year by year, 2009 to 2024

Plan year	Participants	Net assets	Recordkeeper
2024	8,185	$313 million	Southwest Service Administrators
2023	7,789	$291 million	Southwest Service Administrators
2022	7,670	$256 million	Zenith American Solutions
2021	7,538	$305 million	Zenith American Solutions
2020	7,114	$283 million	Zenith American Solutions
2019	6,877	$258 million	Zenith American Solutions
2018	6,625	$219 million	Zenith American Solutions
2017	6,421	$241 million	Zenith American Solutions
2015	6,562	$201 million	Zenith American Solutions
2014	6,603	$209 million	Zenith American Solutions
2013	6,877	$206 million	Zenith American Solutions
2012	7,045	$193 million	Zenith American Solutions
2011	7,012	$176 million	American Benefit Plan Administrator
2010	7,285	$178 million	American Benefit Plan Administrator
2009	7,489	$165 million	not listed

If you had money in one of these plans

Call Southwest Service Administrators, which runs the Operating Engineers Local 428 Annuity Trust Fund. With your Social Security number and the plan name, it can tell you whether you still have a balance and, if not, where it went.
Or call the plan administrator listed on the plan below ((602) 249-3582). That number was filed for 2025; ask for the benefits or retirement plan office.
Still stuck? The Department of Labor's benefits advisers help for free: askebsa.dol.gov or 1-866-444-3272. Never pay anyone to find your own money.

What these numbers are

They come from the Form 5500 annual reports each plan files with the Department of Labor, as the plan filed them. A plan year is usually a calendar year.
Participants counts everyone in the plan at year end: current employees, former employees who still have a balance or a pension coming, and retirees or beneficiaries being paid.
The recordkeeper is the service provider whose Schedule C entry says it keeps the plan's records. Small plans do not file Schedule C, so some plans show none.
We cannot see anyone's account. Only the plan or its recordkeeper can tell you your balance.

Sources: U.S. Department of Labor, Form 5500 datasets and PBGC trusteed plans. How we read them.

All 2 plans

Arizona Operating Engineers Pension Plan

Operating Engineers Local 428 Annuity Trust Fund

If you had money in one of these plans

What these numbers are

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