GraniteShares YieldBOOST 20Y Treasuries ETF (FIYY)

The GraniteShares YieldBOOST 20Y Treasuries ETF (ticker FIYY) is an exchange-traded fund that holds a portfolio of 20-year US Treasury bonds while overlaying a systematic covered-call strategy to boost the yield received by investors.

FIYY emerged in the early 2020s as part of GraniteShares’ expansion into yield-enhancement products. GraniteShares, founded by asset managers focused on rules-based, transparent index strategies, recognized that the low-rate environment following the financial crisis had made traditional Treasury yields inadequate for income-seeking investors. The solution was a covered-call overlay: a systematic strategy of selling call options against the underlying Treasury holdings to collect option premiums that would supplement the coupon income.

The fund’s structure is straightforward. It holds a ladder of US Treasury bonds with maturities centered around 20 years—the duration band that provides meaningful yield while remaining shorter than the ultra-long end of the curve. This Treasury core is passively managed to track the underlying index, with no active bond-picking decisions. What distinguishes FIYY from a simple Treasury ETF is the mechanical call-writing program applied on top.

The covered-call mechanism works as follows: the fund systematically sells call options on its Treasury holdings, collecting the premium that option buyers pay for the right to purchase the bonds at an agreed strike price. These premiums flow into the fund’s distributions, boosting yield well above what coupon payments alone would deliver. In a rising-rate environment, where Treasury prices are falling, the call options typically expire worthless because the bond is worth less than the strike price. The fund keeps the entire premium without losing holdings. In a falling-rate environment, however, the calls can be exercised, capping the fund’s upside if bond prices rally sharply.

This trade-off is the core feature and risk of the product. Investors who own FIYY are explicitly accepting a cap on capital appreciation in exchange for higher current income. If 20-year Treasury yields fall dramatically—typically a falling-rate scenario where a plain Treasury fund would deliver substantial gains—FIYY will underperform by the magnitude of the capped appreciation. Conversely, in a stable or rising-rate environment, the premium income acts as a cushion against falling prices.

The fund trades on a stock exchange like any other ETF, priced continuously throughout the trading day. Its expense ratio is modest for a product with an active overlay, as the call-writing process is systematic rather than requiring extensive discretionary management. The fund distributes its income regularly, typically quarterly, combining Treasury coupon payments with option premiums collected during the period. FIYY’s secondary-market liquidity depends on its assets under management and the depth of buyers and sellers, though Treasury bonds themselves are among the most liquid securities in existence.

A key consideration for investors is the daily-reset mechanics of the call strategy. The fund does not simply write calls once and hold them to expiration. Instead, it continuously rolls the option positions, writing new calls at new strike prices and maturities as old ones expire. This means the yield and the strike price change with market conditions. In periods of high option volatility, premiums are larger, and FIYY’s current yield increases. In quiet markets, premiums shrink, and yield normalizes. This dynamism is the fund’s strength—it allows yield to adjust with market conditions—but it also means the fund’s yield is not fixed or predictable far into the future.

The real risks worth understanding include the cap on upside mentioned above, the fund’s inability to participate fully in Treasury price appreciation if rates fall sharply, and concentration risk tied to the 20-year maturity band. If Treasury yield curve dynamics shift significantly, the fund’s returns may diverge from investor expectations. Additionally, the fund does not hedge interest-rate risk: as Treasury yields rise, the value of the 20-year bonds declines, and FIYY’s net asset value falls alongside them. The covered calls provide income but do not eliminate this duration risk.

FIYY appeals primarily to conservative income investors seeking higher current yields from Treasury bonds without taking credit risk. It is often used by retirees, income strategies, and investors who believe rates will remain elevated or rise further, making the capped-upside trade-off acceptable. Prospective investors should examine the fund’s fact sheet and prospectus on GraniteShares’ website, which detail the call-writing protocol, strike selection, and expected yield under different interest-rate scenarios. Watch how FIYY’s total return has compared to a simple Treasury ETF during periods of falling rates to understand the real cost of the covered-call cap. The fund’s historical distributions and premium collections provide transparency into how much incremental income the overlay has delivered over time.