TIBCX Mutual Fund — Thornburg Investment Income Builder Fund Class C

Thornburg Investment Income Builder Fund Class C (TIBCX)

Updated October 15, 2026.

TIBCX is a Mutual Fund. its distribution rate is 2.60%, its trailing-12-month yield is 4.58%, its expense ratio is 1.90%. Dividend Vision Distribution Safety Score™ is 83/100 (Safe). Total return is 812.6% over the past 23.8 years, 416.6 points behind SPY at 1229.2%.

Thornburg Investment Income Builder Fund Class C is a mutual fund that pursues income through a diversified portfolio of income-producing securities, primarily stocks and bonds, with at least 80% of assets invested in income-producing securities and at least 50% in common stocks. The fund carries a current distribution rate in the moderate range and operates at an expense ratio of 1.90%. It appeals to income-focused investors seeking exposure to a balanced mix of equity and fixed-income securities.

TIBCX performance versus SPY

Price and return data through 2026-10-15.

Total return is 812.6% over the past 23.8 years, 416.6 points behind SPY at 1229.2%. Over the past year its total return — price change plus distributions reinvested — is 21.5%. Its deepest 1-year drawdown was 5.6%.

TIBCX key facts

Distribution Safety Score™

83 · Safe

Safety-Adjusted Yield

2.16%

Issuer

Thornburg

Asset type

Mutual Fund

Asset class

Equity

Inception date

12/24/2002

Expense ratio

1.90%

Distribution rate

2.60%

Distribution frequency

Quarterly

Trailing yield

4.58%

Last close

$37.09 (as of 2026-10-15)

NAV

$35.92 as of 2026-09-30; source eodhd (stale)

Premium / discount

N/A (price 2026-10-15, NAV 2026-09-30) (NAV stale)

AUM

$22,640,860,000

Average volume

0.0

Dividend

$0.252

Ex-dividend date

09/17/2026

Payment date

09/17/2026

Beta

0.76

How Dividend Vision calculates yield and returns

Distribution rate (2.60%) uses calculation basis unavailable. Issuer rates can use a different denominator and date, including ex-date NAV. Trailing-12-month yield (4.58%) is the sum of split-adjusted cash distributions with ex-dates in the last 12 months, divided by the published price. 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.

TIBCX risks and drawbacks

TIBCX'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 5.6%.

Who may consider TIBCX — and who may not

TIBCX 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 (TIBCX 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.

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Tagged: Mutual Fund.

Frequently asked questions

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