FIW vs PHO: Weighing Two Established Water ETFs

Key Takeaways

• FIW and PHO are both passively managed water-sector ETFs, but they track different indexes: FIW follows the ISE Clean Edge Water Index, while PHO tracks the NASDAQ OMX US Water Index.
• FIW carries a lower expense ratio (0.50% versus 0.59%) and uses a more balanced modified market-capitalization weighting, reducing single-name concentration risk.
• PHO is more top-heavy, with its top 10 holdings accounting for roughly 53% to 59% of assets, versus about 40% to 43% for FIW.
• Both funds share substantial overlap in names such as Ecolab, Roper Technologies, Waters, and Ferguson, but differ in sector balance and utilities exposure.
• Risk profiles are broadly similar (both medium-risk with beta near 1.0), though PHO's non-diversified structure carries somewhat higher concentration risk.
• Tickeron AI Verdict: FIW is favored for its lower cost and more balanced diversification profile.

Why These Two Water ETFs Stand Out

The First Trust Water ETF (FIW) and the Invesco Water Resources ETF (PHO) remain two of the more established exchange-traded funds providing exposure to the global water theme. They do not function as identical products; instead, each offers a distinct approach to the same core idea of growing demand for water treatment, purification, and infrastructure. Both are passively managed and draw from overlapping sets of U.S.-listed water companies, yet differences in indexing methodology, sector allocations, and costs create noticeably different portfolios. This comparison feels relevant at present because water continues to be viewed as a long-duration infrastructure and industrial-growth area, influenced by interest rates, government spending, and corporate investment cycles. I also checked this using Tickeron’s AI Screener to see how the two compare across industry metrics.

First Trust Water ETF (FIW) Overview

FIW aims to track the ISE Clean Edge Water Index, a modified market-capitalization-weighted benchmark that selects the 36 largest exchange-listed companies with meaningful revenue from the potable water and wastewater sectors. The index incorporates market-capitalization, liquidity, and concentration rules and undergoes semi-annual rebalancing. The fund holds approximately 36 names at present. Top positions include WAT (Waters Corporation), A (Agilent Technologies), ROP (Roper Technologies), AWK (American Water Works), and VLTO (Veralto), together with IEX (IDEX), J (Jacobs Solutions), MLI (Mueller Industries), ECL (Ecolab), and FERG (Ferguson Enterprises). Industrials represent the largest sector slice at roughly 57% to 59%, followed by healthcare at about 13%, utilities near 11%, and technology around 9%. The net expense ratio stands at 0.50%, with a contractual cap at 0.60%.

Invesco Water Resources ETF (PHO) Overview

PHO seeks to follow the NASDAQ OMX US Water Index, a modified liquidity-weighted benchmark of U.S.-listed companies that develop products for conserving and purifying water across homes, businesses, and industries. The fund typically invests at least 90% of assets in index members and operates as a non-diversified vehicle. It currently holds about 40 names. Leading holdings feature ROP (Roper Technologies), ECL (Ecolab), WAT (Waters Corporation), FERG (Ferguson Enterprises), and IDXX (IDEXX Laboratories), along with VLTO (Veralto), AWK (American Water Works), XYL (Xylem), A (Agilent Technologies), and PNR (Pentair). Industrials account for roughly 47% to 56%, with information technology and healthcare next, and smaller allocations to utilities and basic materials. The net expense ratio is 0.59%.

The Water Theme in Context

Both ETFs sit where industrial, utility, and technology exposures meet around water treatment, purification, testing, and distribution. Long-term demand stems from aging municipal infrastructure, stricter water-quality rules, and efficiency spending by corporations and households. Recent cycles have shown sensitivity to interest-rate expectations, which influence valuations of capital-intensive utility and infrastructure holdings, as well as capital-expenditure patterns among industrial and lab-instrument firms. Potential catalysts include contaminant remediation efforts, digital water-management solutions, and infrastructure funding programs, while risks involve cyclical industrial demand, regulatory shifts, and valuation pressures on higher-multiple technology and healthcare names present in both portfolios. From what I see, these structural elements remain central when evaluating either fund.

Performance Positioning and Risk Profiles

In recent periods, both funds have tracked the broader industrials-water segment closely, though their positioning has shown modest divergence. FIW’s more even weighting and greater utilities exposure have tended to lend slightly more defensive traits, whereas PHO’s heavier concentration in larger industrial and technology names can magnify moves tied to earnings from its top holdings. Both display similar medium-risk characteristics, with beta near 1.0 and comparable three-year volatility, so the key distinction for investors lies in structure rather than pure market direction. In an environment of rate sensitivity and uneven industrial demand, FIW’s lower cost and reduced single-name concentration may support a steadier risk-adjusted outcome compared with PHO’s more concentrated approach. I also checked this using Tickeron’s AI Screener to see how the stock compares to others in the industry.

Why FIW Holds a Structural Edge

Based on observable structural factors, the assessment points to FIW over PHO in the current setting. FIW provides a lower expense ratio (0.50% versus 0.59%) and a more balanced modified market-capitalization weighting that limits reliance on a small group of large holdings. Its somewhat higher utilities exposure adds a layer of defensiveness amid interest-rate sensitivity, while semi-annual index rebalancing supports disciplined turnover. Although PHO’s concentration can boost upside during strong cycles for its top industrial and technology names, FIW’s mix of cost efficiency, diversification, and steadier sector balance supplies a modest structural advantage. This view reflects relative positioning rather than a forecast of near-term returns.

Exploring Tickeron’s AI Screener

In my own research, Tickeron’s AI Screener has proven useful for comparing ETFs like these by applying filters for industry exposure, volatility, and performance metrics. It helps surface patterns across thousands of securities more quickly than manual review alone. I find it especially practical when evaluating water-sector holdings and their relative characteristics.

Disclaimer

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Contributor

Scott Bell|Expert

I’m a trader and independent researcher. My interest lies at the intersection of financial markets, algorithms, and capital management. I develop data-driven tools and strategies and study algorithmic approaches to market analysis. I help turn complex market data into clear insights and practical systems. I believe technology should support, not replace, investment thinking

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