Four clauses, not one number. Section 2(a)(51)(A) reaches, in order: a natural person who owns not less than $5,000,000 in investments, including a person holding a joint or community-property interest with a qualified purchaser spouse; a company owning at least $5,000,000 in investments that is owned by two or more natural persons related as siblings, spouses or former spouses, direct lineal descendants, their spouses, their estates, or foundations, charitable organizations or trusts established by or for them; a trust not covered by that family-company clause, not formed to acquire the securities offered, whose trustee and every settlor is itself a person described in one of the other clauses; and any person, acting for its own account or for the accounts of other qualified purchasers, that "in the aggregate owns and invests on a discretionary basis, not less than $25,000,000 in investments". A page that states the $5 million figure alone is describing the first clause, not the definition.
"Investments" is a defined term, and defining it as net worth is the common error. The SEC's rule, 17 CFR 270.2a51-1, lists what counts: securities (with an exclusion for securities of an issuer under common control with the purchaser, subject to carve-outs), real estate held for investment purposes, commodity interests and physical commodities held for investment purposes, certain financial contracts entered into for investment purposes, and cash and cash equivalents held for investment purposes, which the rule says include bank deposits, certificates of deposit, bankers acceptances and similar bank instruments, and the net cash surrender value of an insurance policy. The rule then narrows what "held for investment purposes" means. Real estate "shall not be considered to be held for investment purposes" if the person or a related person uses it "for personal purposes or as a place of business, or in connection with the conduct of the trade or business". So the family home and the building the family business operates from are both out.
Two mechanical rules finish the calculation. Investments are valued at fair market value on the most recent practicable date, or at cost. And there "shall be deducted from the amount of such person's Investments the amount of any outstanding indebtedness incurred to acquire or for the purpose of acquiring the Investments owned by such person". Margin borrowing used to build the portfolio therefore reduces the number the test is applied to. The practical result is that a person can be comfortably wealthy, comfortably an accredited investor, and still fall short of the qualified purchaser threshold, because the wealth is in a house, a business and leverage rather than in unencumbered investments.
There is a carve-out in subparagraph (C) that a summary should at least mention. A company that would itself be an investment company but for the exclusions in section 3(c)(1) or 3(c)(7), which the statute calls an "excepted investment company", is not a qualified purchaser unless all its pre-amendment beneficial owners, meaning those who acquired their securities on or before April 30, 1996, have consented to its treatment as one. The date is the tell that this is a grandfathering provision rather than a general rule, and it is why a fund investing in another fund cannot assume the status travels.
What the status buys, and who it is really for. Section 3(c)(7) takes an issuer outside the definition of an investment company where its outstanding securities "are owned exclusively by persons who, at the time of acquisition of such securities, are qualified purchasers", and where it is not making and does not propose to make a public offering. The companion exclusion, section 3(c)(1), does not impose a wealth test on investors but caps their number. So the qualified purchaser test is the price of an unlimited investor count, and it exists to serve the fund's structure rather than to certify anything about the person. How those funds actually operate is a separate subject.
The Regulation A sense, and why the statute permits the collision. Securities Act section 18(b)(3) makes a security covered "with respect to the offer or sale of the security to qualified purchasers", leaving the definition to an SEC rule, and then adds a sentence that resolves the whole confusion: in prescribing that rule the SEC "may define the term 'qualified purchaser' differently with respect to different categories of securities, consistent with the public interest and the protection of investors". Congress contemplated more than one definition. The SEC's rule for Regulation A takes the maximum advantage of that permission by defining the term as every purchaser in a Tier 2 offering, which is how Tier 2 securities became covered securities and dropped out of state registration. Read against the private-fund test, the two definitions point in opposite directions: one narrows the buyer pool to the wealthiest, the other widens preemption to everyone in a public offering that anyone may buy into.