TIBIX Mutual Fund — Thornburg Investment Income Builder Fund Class I

Thornburg Investment Income Builder Fund Class I (TIBIX)

Updated October 8, 2026.

TIBIX is a Mutual Fund. its distribution rate is 3.30%, its trailing-12-month yield is 5.27%, its expense ratio is 0.91%. Dividend Vision Distribution Safety Score™ is 95/100 (Safe). Total return is 951.4% over the past 22.9 years, 65.0 points behind SPY at 1016.4%.

At the current 3.30% distribution rate, a $10,000 investment would generate approximately $330 per year, or about $82.50 per quarter if the next payment matches the last regular one.

Thornburg Investment Income Builder Fund Class I is a mutual fund that pursues income by investing primarily in stocks and bonds, maintaining at least 80% of assets in income-producing securities with a minimum 50% allocation to common stocks. The fund carries a modest current distribution rate and has an expense ratio of 0.91%. It appeals to income-focused investors seeking a balanced approach to dividend and interest income across both equity and fixed-income markets.

TIBIX performance versus SPY

Price and return data through 2026-10-08.

Total return is 951.4% over the past 22.9 years, 65.0 points behind SPY at 1016.4%. Over the past year its total return — price change plus distributions reinvested — is 23.8%. Its deepest 1-year drawdown was 5.4%.

TIBIX key facts

Distribution Safety Score™

95 · Safe

Safety-Adjusted Yield

3.13%

Issuer

Thornburg

Asset type

Mutual Fund

Asset class

Equity

Inception date

12/24/2002

Expense ratio

0.91%

Distribution rate

3.30%

Distribution frequency

Quarterly

Trailing yield

5.27%

Last close

$37.66 (as of 2026-10-08)

NAV

$37.86 as of 2026-09-30

Premium / discount

0.53% discount (price 2026-10-08, NAV 2026-09-30) (NAV stale)

AUM

$23,237,060,000

Average volume

0.0

Last dividend

$0.351

Last ex-dividend date

09/17/2026

Last payment date

09/17/2026

Beta

0.76

P/E ratio

4.561

How Dividend Vision calculates yield and returns

Distribution rate (3.30%) is the latest regular payout annualized by the fund's stated frequency, divided by the last close. Issuers often publish this as “Distribution Rate” on the fact sheet. Trailing-12-month yield (5.27%) is the sum of distributions paid in the last 12 months, split-adjusted, divided by the last close. It lags a recent raise or cut. Total return uses split-adjusted close with distributions reinvested on the ex-dividend date (a modeling convention, not the cash-settlement date) from the first stored bar on or after inception through the latest bar, compared with the same window on the benchmark. That is the security's total return, not your personal gain/loss.

Yield and safety methodology · Distribution rate methodology · Distribution Safety Score methodology

Sources and review

Primary sources: Thornburg; prices and distributions from Dividend Vision, derived from vendor EOD data.

Reviewed by Bert Sweet, CEO and Co-owner of Dividend Vision. Methodology: Distribution Safety Score.

TIBIX risks and drawbacks

TIBIX's current distribution rate is moderate, not a high-yield payout — the strategy is dividend quality more than maximum income. Payments are quarterly, so cash flow is lumpy versus a monthly fund. Total return has trailed SPY over the available window. The deepest 1-year drawdown on record here is 5.4%.

Who may consider TIBIX — and who may not

TIBIX may suit someone looking for a high Distribution Safety Score, moderate current income with a quality tilt. It is a weaker fit for investors who need monthly cash flow (TIBIX pays quarterly); investors hunting double-digit covered-call yields; investors whose main goal is matching SPY total return. This is educational context, not a recommendation to buy or sell.

Frequently asked questions

More securities from Thornburg.