This ETF tracks Principal's proprietary small-cap multi-factor index. It selects stocks from the US small-cap universe by combining four factors: value, quality, momentum, and low volatility. Its structure aims to ease the volatility inherent in small caps through more diversified factor exposure than a single-factor strategy offers.

It suits investors who want the small-cap premium but also want a systematic, factor-based quality filter compared with a plain index.

It is a passively managed (index-tracking) ETF launched in 2015 by Principal Asset Management.

Among US small caps, the fund assigns composite scores based on financial soundness and profitability (quality), undervaluation (value), price trend (momentum), and volatility level (low volatility), then concentrates its investments in the top-ranked stocks. By leveraging the correlations between factors, the structure spreads out the cycle risk of single-factor strategies.

• Applies four factors at once within small caps, offering a quality filter compared with simply tracking the Russell 2000
• Semiannual rebalancing regularly reflects changes in factor scores

Assets under management (AUM) stand at $2.7B, and the expense ratio is 0.38% per year.

Unlike pure index-tracking products among peer small-cap ETFs such as IWM and SCHA, it applies a factor filter, so its fees are somewhat higher. That reflects a strategic positioning aimed at capturing factor premiums.

Small caps tend to react sensitively to the interest-rate environment, and a pattern of capital flowing into small caps broadly is observed when expectations of rate cuts strengthen. Because PSC uses a factor filter to concentrate on quality names within small caps, it tends to move in step with high-quality stocks during small-cap upcycles.

Across small-cap ETFs generally, fund flows take shape amid interest from investors seeking returns that differ from large caps. Multi-factor strategies tend to keep volatility somewhat lower than purely market-cap-weighted small-cap ETFs, which meets demand from investors who want to manage risk even within small caps.

Its strength is systematic selection based on four factors, while its weaknesses are somewhat higher fees than a plain index and factor cycle risk.

Among those shown in the table, DYNF is BlackRock's multi-factor strategy ETF that covers the entire market beyond small caps, while DFSU is Dimensional's US small-cap ETF, which emphasizes value and profitability factors. JMEE is JPMorgan's actively managed small-cap ETF, differing in its research-based stock selection. Meanwhile, ARKK follows an active innovation growth strategy whose direction differs from a small-cap factor approach, so it is cited as an alternative for growth-oriented investors rather than as a direct comparison. For investors who want lower-cost, broad index tracking within small caps, options such as IWM, SCHA, and VBR can also be considered.

These are points to confirm before investing in PSC. Given the nature of factor strategies, it is important to check the benchmark, costs, and factor cycle in advance, and an understanding of small-cap volatility and factor effectiveness is especially necessary.

The volatility peculiar to small caps is eased by the factor filter but not fully eliminated, and factor effectiveness can vary with interest rates and the economic cycle. Investors should recognize that when factor strategies lag, relative returns may fall behind a simple small-cap index.

It is a suitable choice for investors who want the small-cap premium along with factor-based quality filtering. If cost is a priority, it can be compared against low-fee index-tracking ETFs such as IWM and SCHA.