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Terminology comes and goes. Two things are are most important. One is that the terminology is used broadly enough that there is a shared understanding of what is meant by it. The other is that the terminology does not conflict with its shared understanding within government agencies that oversee the industry. How many people today would understand what was meant by a Keogh plan or an H.R. 10 plan? How many know that today's hot Roth trend is named after William Roth, the Senator from Delaware that came up the Roth IRA in 1989 that in 2001 morphed into the Roth 401(k)? How many know that the concept of 401k deferrals was used in plans in the 1950s, frowned upon by the IRS, but then validated when section 401(k) was added in 1978? Interestingly, in the late 1970s people started out calling the 401(k) plan as salary reduction plans, and that terminology was not well received by employees. Today, solo-k generically is recognized as a one-person plan as does the IRS https://www.irs.gov/retirement-plans/one-participant-401k-plans. Some pre-approved plan document providers have products that basically are pared down adoption agreements of their 401(k) documents. These products use the term "owners only plan". Given the many ways that one-person plans get into regulatory trouble, maybe we should refer to owners only plans as "OOPs"!

Hoping that Mike Johnson doesn't see his shadow and give us 6 weeks of government shutdown!

A plan that tax law classifies as a profit-sharing plan, whether it includes or omits a § 401(k) cash-or-deferred arrangement, is a pension plan if one follows ERISA title I’s definitions. ERISA § 3(2)(A), 29 U.S.C. § 1002(2)(A) https://www.govinfo.gov/content/pkg/USCODE-2023-title29/pdf/USCODE-2023-title29-chap18-subchapI-subtitleA-sec1002.pdf. And while tax law might not distinguish between “solo-k” and some other plan with a § 401(k) arrangement, an investment or service provider’s business classifications can matter greatly to consumers and to their intermediaries and advisers. For example, Individual(k)Ô (Ascensus claims this as a trademark) gets a set of service agreement, trust agreement, plan documents, investment arrangements, and other provisions that’s distinct from other business lines. And differences between a “solo” and a “regular” 401(k) service arrangement can affect even a plan’s provisions. The plan-documents set Ascensus requires for an Individual(k)Ô omits some choices Ascensus allows for other business lines, and imposes some plan provisions Ascensus does not require for other business lines. The sales or business lingo might seem awkward to a tax practitioner, but might convey meaning to consumers, intermediaries, and advisers. For better or worse, “solo 401(k)” now has some trade-usage meaning to describe generally an arrangement a service provider designed for an individual-account (defined-contribution) retirement plan its sponsor intends as one not expected to cover any employee beyond a shareholder-employee or a self-employed deemed employee, or one’s spouse. And that trade-usage meaning includes a sense that investment and service providers offer constrained terms for those plans.

They are likely a control group so one plan with each LLC adopting should be fine. Even if not a CG they could do that as a multiple employer plan. However, if the desire is to use a vendor's solo-k product, need to make sure it accommodates whatever structure/LLC relationship you have.