Thornburg Investment Income Builder Fund Class I (TIBIX): fair value, margin of safety and Wheel Score

Is TIBIX undervalued?

TIBIX closed at 38.39 on 5 Nov 2026, more than 30% above the GLS average fair value of 4.27. Only 0 of the 8 models that produced a value sit above the price. By our models the shares are priced well beyond what the filed earnings, cash flow and book value support; the "below fair value" Wheel Trade Filter keeps names like this under 70.

The 8 models disagree widely: GLS Growth gives 0.0037 while DDM gives 29.18. A spread that wide means the average is sensitive to which methods you trust; the model table below shows where each one lands, and the Quote page lets you switch any of them off.

TIBIX looks like a fund, note or preferred share rather than an operating company, so the nightly engine files it under Fund / Note: the valuation models are not built for it, and its Wheel Score is capped at 45.

Nine valuation models for TIBIX

Each model turns the latest filed numbers into a value per share; the GLS fair value is the simple average of the ones that produce a positive number. The last two rows are shown for reference and never enter the average. The Quote page lets you switch any model off and add your own margin of safety.

Quality and financial health

Financial health is average - TIBIX passes 6 of the nine Piotroski tests, which passes the "Piotroski 6 or more" Wheel Trade Filter. The Financials tab on the Quote page shows which tests fail. There is no GLS Moat score for TIBIX: funds, notes and second share lines get none, and so does a company with fewer than two years of accounts on file. The Moat part of the Wheel Score is zero.

Returns on capital are thin or negative - ROIC 0.6%, ROE 0.7%, ROA 0.5% - with debt at 0.10 times equity and a free-cash-flow yield of 0.6%.

The dividend yield is high at 5.17% (payout ratio 1497%) - a payout above 100% of earnings, which is not covered by profits. A yield this size is often the market's way of pricing a risk to the payout, so the health score and cash flow matter more than usual.

Institutional ownership scores 3/10, insider activity 5/10 and Congressional trading 5/10 on the GLS smart-money scales.

Wheel Score 16: No options

TIBIX has no listed options in the nightly snapshot, so there is nothing to sell and the stock cannot be wheeled however good the business. It fails the first Wheel Trade Filter (options that actually trade), so the score stays under 70 and is shown as "No options" (16 here). The valuation and quality numbers still apply to owning the shares outright.

Volume runs at - a day on a market cap of $23.0B, with a beta of 0.77 - a low beta, so day-to-day moves are smaller than the market's; the Stability part of the Wheel Score rates that strong.

The Wheel Score ranks ~7,400 US stocks for selling cash-secured puts and covered calls: a stock must pass all 9 Wheel Trade Filters to score 70, and the score then ranks the ones that pass; the Sunday Scan is the top 10. It is updated nightly and is not a recommendation. How the Wheel Score works · the walkthrough lesson shows how it fits into a trade, start to finish.

Upcoming events

No upcoming earnings date is recorded for TIBIX in the nightly calendar.

Earnings, dividend, IPO, split and economic calendars for the whole market, filterable to your watchlists.

Similar stocks in Asset Management - Income

The 12 companies below are the closest to Thornburg Investment Income Builder Fund Class I by market cap within the Asset Management - Income industry, each with its own fact sheet; the Compare page puts up to eight of them side by side.

⚖ Compare TIBIX with 7 of them   All Financial Services stocks →