Invesco RAFI US 1000 ETF (PRF)

The Invesco RAFI US 1000 ETF (ticker PRF) holds roughly the largest 1,000 US companies by fundamental measures — earnings, revenue, and book value — instead of by their stock-market price, which gives it a persistent tilt toward businesses that markets overlook and away from those markets have bid up steeply.

Fundamentals-based indexing, or RAFI (research affiliates fundamental index), is a deliberate alternative to the market-cap weighting that dominates passive index funds. The innovation is simple: instead of buying companies in proportion to their stock-market value — so that the bigger the market price, the bigger your holding — you weight by economic fundamentals. The four measures Invesco uses are a company’s annual sales, the value of its assets on the balance sheet, its annual earnings, and its dividend payments. At the end of each year, the fund rebalances, adjusting positions to maintain those fundamental weights.

The effect is a built-in value tilt. When markets become exuberant about growth stories and bid up the largest companies, a cap-weighted index fund follows the market higher and higher. A fundamentals-weighted fund rebalances the other way: it automatically sells some of the stocks that have soared (to maintain their fundamental weight) and buys more of the ones that have been overlooked. This is a form of market-timing by formula — not perfect, but structured to avoid the worst of late-cycle excess. In busts, the same mechanism works in reverse: the fund is forced to sell the battered stocks and buy the ones that have held up. That counterintuitive rebalancing is the source of its long-term advantage.

The holdings and their composition

PRF holds the 1,000 largest US companies by combined fundamental weight — roughly two-thirds of the US public market’s total economic output. The portfolio spans all sectors: technology, healthcare, financials, energy, industrials, and consumer goods. But the weighting differs markedly from the S&P 500. A cap-weighted S&P 500 can become heavily skewed toward the largest mega-cap technology companies if their stock prices soar relative to earnings; a fundamentals-weighted index dampens that concentration automatically.

The typical tilt is toward profitable, larger mid-cap companies that are generating cash and earnings relative to their stock price, and away from very expensive growth stories. The holdings include well-known large-cap names — banks, industrials, energy companies — that a pure market-cap index would underweight if their stocks are cheap, and smaller exposures to the mega-cap technology names that dominate market-cap indices.

The annual rebalancing dance

Every year at the end of December, the fund reconstitutes, updating the fundamental weights of each company. This annual rebalancing forces the fund to sell some winners and buy some losers — the opposite of momentum investing. In practice, this tends to mean buying energy stocks and industrials during periods when technology has surged, and rotating toward technology when energy and financials have been crushed. Over long periods, this mechanical counterbalance has provided a persistent lift: Invesco’s research shows that fundamentals-weighted indices have typically outpaced cap-weighted ones by 1–2 percentage points per year, though the advantage varies by decade.

The cost of this approach is tracking error and annual turnover. Because the fund is reweighting systematically, it trades more than a static cap-weighted index and incurs more transaction costs and tax consequences in taxable accounts. The fund is also not tax-optimized in the way some passive funds are; it is rebalancing for fundamental weight, not for tax efficiency.

Behavior across market cycles

In years when the market rewards profitable value — such as when energy stocks or financials lead — PRF tends to outperform a market-cap index because the fundamental weighting has given it a higher weight to those sectors. In years when the market bids up expensive growth stories — such as the mega-cap technology surge of 2023–2024 — PRF lags because its fundamental weighting caps the exposure to the most expensive names. Neither is right or wrong; they are different bets.

The fund is especially effective during market dislocations and valuations extremes. In the dot-com crash of 2000–2002, a fundamentals-weighted index would have sold technology stocks before the crash and avoided the worst damage. In the 2008–2009 financial crisis, it would have been underweight financials. This is not because the index has foresight but because it maintains disciplined weights regardless of sentiment, which naturally buys low and sells high by force rather than by genius.

Over a full market cycle — expansion, peak, contraction, trough — the discipline of annual rebalancing and the tilt toward fundamental profitability have historically delivered cumulative outperformance. But that edge is not guaranteed in any given year or decade, and patient capital is required to stay the course.

Expense and trading mechanics

The fund’s expense ratio is modest, competitive with other large-cap equity ETFs. It trades on the NYSE under the ticker PRF, with sufficient trading volume that bid-ask spreads are tight. Dividends are paid regularly and can be reinvested or taken as cash. For investors seeking broad US exposure with a tilt toward value and profitability, PRF offers a systematic way to capture the long-term advantage of fundamental weighting without the effort of individual stock picking.