AIDBX — Diversified Municipal Portfolio, Class B
Data updated: 2026-08-26
AIDBX — Diversified Municipal Portfolio, Class B. 1.56% expense ratio · 3.00% deferred sales charge · since 2002. Holdings, fees, performance and SEC filings.
AIDBX Fund Overview
AIDBX — Diversified Municipal Portfolio, Class B is a US mutual fund managed by Bernstein Sanford C Fund Inc., categorised as Intermediate Municipal - National Bond. ABC INVEST provides holdings, performance, costs, cashflows, risk data, prospectus documents and SEC filings, sourced from SEC filings.
- Type: US mutual fund
- Manager: Bernstein Sanford C Fund Inc.
- Category: Intermediate Municipal - National Bond
- Assets under management: $5.30B
- Ticker: AIDBX
- SEC CIK: 0000832808
- SEC series ID: S000011055
- Share class ID: C000030491
AIDBX Investment Objective and Strategy
Diversified Municipal Portfolio describes its objective and strategy as follows, from its latest prospectus filed with the SEC by Bernstein Sanford C Fund Inc..
Investment objective
The investment objective of the Portfolio is to provide safety of principal and maximize total return after taking account of federal taxes.
Principal investment strategy
As a matter of fundamental policy, the Portfolio, under normal circumstances, invests at least 80% of its net assets in municipal securities. For purposes of this policy, net assets include any borrowings for investment purposes. The Portfolio invests no more than 25% of its total assets in municipal securities of issuers located in any one state. The municipal securities in which the Portfolio may invest are issued to raise money for a variety of public or private purposes, including general financing for state and local governments, the District of Columbia or possessions and territories of the United States, or financing for specific projects or public facilities. The interest paid on these securities is generally exempt from federal income tax, although in certain instances, it may be includable in income subject to alternative minimum tax.
The Portfolio invests at least 80% of its total assets in municipal securities rated A or better by national rating agencies (or, if unrated, determined by AllianceBernstein L.P., the Portfolios investment manager (the Manager), to be of comparable quality) and comparably rated municipal notes. The Portfolio may invest up to 20% of its total assets in fixed-income securities rated BB or B by national rating agencies, which are not investment-grade (commonly known as junk bonds). The Portfolio may invest, without limit, in revenue bonds, which generally do not have the pledge of the credit of the issuer. The Portfolio may invest, without limit, in securities or obligations that are related in such a way that business or political developments or changes affecting one such security could also affect the others (for example, securities with interest that is paid from projects of a similar type).
The Portfolio may also invest up to 20% of its net assets in fixed-income securities of U.S. issuers that are not municipal securities if, in the Managers opinion, these securities will enhance the after-tax return for Portfolio investors. The Portfolio may use derivatives, such as options, futures contracts, forward contracts and swaps. In managing the Portfolio, the Manager may use interest rate forecasting to estimate the best level of interest rate risk at a given time. The Portfolio seeks to maintain an effective duration of three and one-half years to seven years under normal market conditions. Duration is a measure that relates the expected price volatility of a security to changes in interest rates. The duration of a debt security is the weighted average term to maturity, expressed in years, of the present value of all future cash flows, including coupon payments and principal repayments.
Within the range described above, the Manager may moderately shorten the average duration of the Portfolio when it expects interest rates to rise and moderately lengthen average duration when it anticipates that interest rates will fall. The Manager selects securities for purchase or sale based on its assessment of the securities risk and return characteristics as well as the securities impact on the overall risk and return characteristics of the Portfolio. In making this assessment, the Manager takes into account various factors including the credit quality and sensitivity to interest rates of the securities under consideration and of the Portfolios other holdings.
AIDBX Holdings
Top 10 holdings of Diversified Municipal Portfolio by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| Patriots Energy Group Financing Agency | 1.01% |
| State of Idaho | 0.96% |
| Southeast Energy Authority A Cooperative District | 0.85% |
| Tennessee Energy Acquisition Corp | 0.85% |
| New Jersey Transportation Trust Fund Authority | 0.77% |
| City of Los Angeles CA | 0.67% |
| County of Miami-Dade FL Aviation Revenue | 0.66% |
| Main Street Natural Gas Inc | 0.57% |
| Illinois State Toll Highway Authority | 0.55% |
| Private Colleges & Universities Authority | 0.53% |
AIDBX Portfolio Allocation
Asset-class allocation of Diversified Municipal Portfolio by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Fixed Income | 99.1% |
| Securitized | 0.6% |
| Real Estate | 0.1% |
AIDBX Costs and Fees
AIDBX costs about $156 per $10,000 invested per year in fund expenses.
- Net expense ratio: 1.56%
- Gross expense ratio: 1.56%
- Portfolio turnover: 26%
- Brokerage commissions: 0.00 bps of average net assets (SEC N-CEN)
AIDBX Cashflows
Over the 12 months to 2026-06, Diversified Municipal Portfolio had net inflows of $524.66M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-06 | −$34.57M |
| 2026-05 | $30.54M |
| 2026-04 | −$25.72M |
| 2026-03 | −$27.70M |
| 2026-02 | $18.72M |
| 2026-01 | −$4.37M |
AIDBX Debt Constituents
Largest debt holdings of Diversified Municipal Portfolio by percentage of net assets, from the latest SEC N-PORT filing.
| Debt holding | % of net assets |
|---|---|
| Patriots Energy Group Financing Agency | 1.01% |
| State of Idaho | 0.96% |
| Southeast Energy Authority A Cooperative District | 0.85% |
| Tennessee Energy Acquisition Corp | 0.85% |
| New Jersey Transportation Trust Fund Authority | 0.77% |
| City of Los Angeles CA | 0.67% |
| County of Miami-Dade FL Aviation Revenue | 0.66% |
| Main Street Natural Gas Inc | 0.57% |
| Illinois State Toll Highway Authority | 0.55% |
| Private Colleges & Universities Authority | 0.53% |
AIDBX Prospectus and SEC Filings
Official Diversified Municipal Portfolio filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
- Prospectus (485BPOS) — filed 2025-01-29
- Prospectus (485BPOS) — filed 2024-01-26
- Prospectus supplement (497) — filed 2026-01-30
- Portfolio holdings (N-PORT) — filed 2026-08-26
- Portfolio holdings (N-PORT) — filed 2026-05-26
- Portfolio holdings (N-PORT) — filed 2026-02-26
- Annual census (N-CEN) — filed 2025-12-12
- Annual census (N-CEN) — filed 2024-12-13
Related Funds
Other Intermediate Municipal - National Bond funds tracked on ABC INVEST:
Data Sources
ABC INVEST compiles this page from public filings made to the U.S. Securities and Exchange Commission (SEC) through EDGAR: portfolio holdings and monthly cashflows from Form N-PORT, expenses and returns from fund prospectuses (Form 485BPOS) and the SEC DERA Risk/Return Summary data sets, annual data from Form N-CEN, and shareholder reports from Form N-CSR.