Colorado Code
Article 1.1 - Uniform Prudent Investor Act
§ 15-1.1-103. Diversification

A trustee shall diversify the investments of the trust unless the trustee reasonably determines that, because of special circumstances, the purposes of the trust are better served without diversifying.
Source: L. 95: Entire article added, p. 310, § 1, effective July 1.
The language of this section derives from Restatement of Trusts 2d § 228 (1959). ERISA insists upon a comparable rule for pension trusts. ERISA § 404(a)(1)(C), 29 U.S.C. § 1104(a)(1)(C). Case law overwhelmingly supports the duty to diversify. See Annot., Duty of Trustee to Diversify Investments, and Liability for Failure to Do So, 24 A.L.R. 3d 730 (1969) & 1992 Supp. at 78-79.
The 1992 Restatement of Trusts takes the significant step of integrating the diversification requirement into the concept of prudent investing. Section 227(b) of the 1992 Restatement treats diversification as one of the fundamental elements of prudent investing, replacing the separate section 228 of the Restatement of Trusts 2d. The message of the 1992 Restatement, carried forward in Section 3 of this Act, is that prudent investing ordinarily requires diversification.
Circumstances can however, overcome the duty to diversify. For example, if a tax-sensitive trust owns an underdiversified block of low-basis securities, the tax costs of recognizing the gain may outweigh the advantages of diversifying the holding. The wish to retain a family business is another situation in which the purposes of the trust sometimes override the conventional duty to diversify.
Rationale for diversification. "Diversification reduces risk . . . [because] stock price movements are not uniform. They are imperfectly correlated. This means that if one holds a well diversified portfolio, the gains in one investment will cancel out the losses in another." Jonathan R. Macey, An Introduction to Modern Financial Theory 20 (American College of Trust and Estate Counsel Foundation, 1991). For example, during the Arab oil embargo of 1973, international oil stocks suffered declines, but the shares of domestic oil producers and coal companies benefitted. Holding a broad enough portfolio allowed the investor to set off, to some extent, the losses associated with the embargo.
Modern portfolio theory divides risk into the categories of "compensated" and "uncompensated" risk. The risk of owning shares in a mature and well-managed company in a settled industry is less than the risk of owning shares in a start-up high-technology venture. The investor requires a higher expected return to induce the investor to bear the greater risk of disappointment associated with the start-up firm. This is compensated risk -- the firm pays the investor for bearing the risk. By contrast, nobody pays the investor for owning too few stocks. The investor who owned only international oils in 1973 was running a risk that could have been reduced by having configured the portfolio differently -- to include investments in different industries. This is uncompensated risk -- nobody pays the investor for owning shares in too few industries and too few companies. Risk that can be eliminated by adding different stocks (or bonds) is uncompensated risk. The object of diversification is to minimize this uncompensated risk of having too few investments. "As long as stock prices do not move exactly together, the risk of a diversified portfolio will be less than the average risk of the separate holdings." R.A. Brealey, An Introduction to Risk and Return from Common Stocks 103 (2d ed. 1983).
There is no automatic rule for identifying how much diversification is enough. The 1992 Restatement says: "Significant diversification advantages can be achieved with a small number of well-selected securities representing different industries . . . . Broader diversification is usually to be preferred in trust investing," and pooled investment vehicles "make thorough diversification practical for most trustees." Restatement of Trusts 3d: Prudent Investor Rule § 227, General Note on Comments e-h, at 77 (1992). See also Macey, supra, at 23-24; Brealey, supra, at 111-13.
Diversifying by pooling. It is difficult for a small trust fund to diversify thoroughly by constructing its own portfolio of individually selected investments. Transaction costs such as the round-lot (100 share) trading economies make it relatively expensive for a small investor to assemble a broad enough portfolio to minimize uncompensated risk. For this reason, pooled investment vehicles have become the main mechanism for facilitating diversification for the investment needs of smaller trusts.
Most states have legislation authorizing common trust funds; see 3 Austin W. Scott & William F. Fratcher, The Law of Trusts § 227.9, at 463-65 n.26 (4th ed. 1988) (collecting citations to state statutes). As of 1992, 35 states and the District of Columbia had enacted the Uniform Common Trust Fund Act (UCTFA) (1938), overcoming the rule against commingling trust assets and expressly enabling banks and trust companies to establish common trust funds. 7 Uniform Laws Ann. 1992 Supp. at 130 (schedule of adopting states). The Prefatory Note to the UCTFA explains: "The purposes of such a common or joint investment fund are to diversify the investment of the several trusts and thus spread the risk of loss, and to make it easy to invest any amount of trust funds quickly and with a small amount of trouble." 7 Uniform Laws Ann. 402 (1985).
Fiduciary investing in mutual funds. Trusts can also achieve diversification by investing in mutual funds. See Restatement of Trusts 3d: Prudent Investor Rule, § 227, Comment m, at 99-100 (1992) (endorsing trust investment in mutual funds). ERISA § 401(b)(1), 29 U.S.C. § 1101(b)(1), expressly authorizes pension trusts to invest in mutual funds, identified as securities "issued by an investment company registered under the Investment Company Act of 1940 . . . ."

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