LifeX 2055 Inflation-Protected Longevity Income ETF (LIAM)

The LifeX 2055 Inflation-Protected Longevity Income ETF (ticker: LIAM) is an exchange-traded fund designed for investors targeting 2055 as the year they will begin drawing retirement income. The fund holds inflation-linked bonds, broad equity exposure, and employs derivative overlays to generate a cash income stream that rises with inflation, protecting the investor’s purchasing power across decades of retirement.

Segment	Details
Core Bonds	Treasury Inflation-Protected Securities (U.S. and international)
Equity Sleeve	Diversified global equities across developed and emerging markets
Derivatives	Call selling and other income enhancement strategies
Target date	2055 (reference year for allocation strategy)
Typical allocation	~45–55% bonds, ~40–50% equities, ~5–10% alternatives (2024)
Expense ratio	~35–50 basis points
Primary risk	Equity volatility, inflation-expectation shifts, derivative counterparty risk

The inflation-linked bond foundation

LIAM’s ballast is Treasury Inflation-Protected Securities and inflation-linked bonds from other developed economies. These securities adjust their principal and coupon payments upward as the Consumer Price Index rises, or downward if deflation occurs (unlikely but contractually possible). This creates a real—inflation-adjusted—income floor. An investor who receives $100 of TIPS coupon income today can be confident that in five years, the fund’s coupon will reflect inflation that actually occurred, so purchasing power is preserved.

The bond sleeve also includes some conventional long-duration bonds, which add yield but do not carry inflation adjustment. The mix between TIPS and conventional bonds shifts over the fund’s lifetime. Earlier (closer to inception), more exposure to equities and conventional bonds captures growth. Later (closer to 2055 and beyond), the allocation tilts toward TIPS and away from equities, reducing volatility as withdrawals begin.

The equity engine

The equity portion—typically 40–50% of the fund—gives LIAM two roles: additional long-term real return and inflation hedge. Over decades, equities have outpaced inflation, and companies often have pricing power that allows them to maintain margins even as costs rise. Holding global equities also diversifies the inflation risk; if the U.S. dollar weakens due to inflation, international holdings in foreign currencies may appreciate, offsetting some of the erosion in domestic purchasing power.

Dividends from the equity portfolio supplement the coupon income from bonds, and the fund reinvests or distributes those dividends according to its stated strategy. The equity portion introduces volatility into the fund’s daily NAV, but for an investor with a decades-long horizon, that volatility is typically tolerable in exchange for inflation protection.

Income enhancement via derivatives

LIAM employs strategic option-selling and other derivative overlays to generate additional income beyond dividends and coupons. By selling call options on equity holdings, the fund collects option premiums that supplement yield. This is income that would not exist from bonds and dividends alone, but it comes with a constraint: if the stock prices rise sharply, the call options are exercised and shares are called away, capping the fund’s upside.

This trade—give up some potential appreciation for higher current income—is deliberate. LIAM is designed for investors who prioritize current income over capital appreciation. Someone seeking maximum growth would avoid this strategy; someone seeking reliable, rising income accepts the capped upside as an acceptable cost.

The 2055 glide path

As the calendar advances toward 2055, LIAM’s allocation will shift toward lower volatility and higher fixed-income content. The fund manager gradually reduces equity exposure and increases the TIPS weighting, moving from a growth-oriented posture to an income-and-preservation posture. An investor entering the fund in 2025 is taking on more equity risk (and upside potential) than an investor entering in 2050, but that investor also has more time for equities to compound before income is needed.

Costs and who it serves

The expense ratio is in the 35–50 basis point range, reasonable for a multi-asset, actively or semi-actively managed income fund. The fund trades on an exchange with good daily liquidity.

LIAM appeals to someone who expects to retire around 2055 and wants a simple, single-fund approach to income generation and inflation protection. It also suits someone already retired who wants to extend their horizon gradually—holding LIAM alongside a more conservative fund, and gradually rebalancing toward LIAM as portfolio risk increases. It is less suitable for aggressive growth seekers or for anyone uncomfortable with equity volatility.

The fund’s prospectus details the allocation glide path and the derivative strategies employed, and the fact sheet shows the current portfolio composition and income yield.