ALTBX — AB National Portfolio
Data updated: 2026-07-24
ALTBX — AB National Portfolio data: holdings, portfolio allocation, expenses, performance, cashflows, risk and SEC filings. Long Municipal - National Bond · $2.00B AUM · 1.50% expense ratio. From SEC regulatory filings.
ALTBX Fund Overview
ALTBX — AB National Portfolio is a US mutual fund managed by Ab Municipal Income Fund, Inc., categorised as Long 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: Ab Municipal Income Fund, Inc.
- Category: Long Municipal - National Bond
- Assets under management: $2.00B
- Ticker: ALTBX
- SEC CIK: 0000798737
- SEC series ID: S000010351
- Share class ID: C000028629
ALTBX Holdings
Top 10 holdings of AB National Portfolio by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| Lamar Consolidated Independent School District | 1.01% |
| San Francisco City & County Airport Comm-San Francisco International Airport | 0.87% |
| Illinois State Toll Highway Authority | 0.80% |
| City of Tacoma WA Electric System Revenue | 0.78% |
| New York Transportation Development Corp | 0.75% |
| California Municipal Finance Authority | 0.62% |
| Private Colleges & Universities Authority | 0.62% |
| District of Columbia Income Tax Revenue | 0.59% |
| San Diego County Regional Airport Authority | 0.58% |
| Port of Seattle WA | 0.57% |
ALTBX Portfolio Allocation
Asset-class allocation of AB National Portfolio by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Fixed Income | 98.6% |
| Securitized | 0.6% |
| Cash & Equivalents | 0.5% |
| Real Estate | 0.2% |
ALTBX Costs and Fees
ALTBX costs about $150 per $10,000 invested per year in fund expenses.
- Net expense ratio: 1.50%
- Gross expense ratio: 1.59%
- Portfolio turnover: 33%
- Brokerage commissions: 0.00 bps of average net assets (SEC N-CEN)
ALTBX Cashflows
Over the 12 months to 2026-02, AB National Portfolio had net outflows of $30.16M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-02 | $9.76M |
| 2026-01 | $22.90M |
| 2025-12 | $13.69M |
| 2025-11 | $9.91M |
| 2025-10 | $16.40M |
| 2025-09 | $3.39M |
ALTBX Debt Constituents
Largest debt holdings of AB National Portfolio by percentage of net assets, from the latest SEC N-PORT filing.
| Debt holding | % of net assets |
|---|---|
| Lamar Consolidated Independent School District | 1.01% |
| San Francisco City & County Airport Comm-San Francisco International Airport | 0.87% |
| Illinois State Toll Highway Authority | 0.80% |
| City of Tacoma WA Electric System Revenue | 0.78% |
| New York Transportation Development Corp | 0.75% |
| California Municipal Finance Authority | 0.62% |
| Private Colleges & Universities Authority | 0.62% |
| District of Columbia Income Tax Revenue | 0.59% |
| San Diego County Regional Airport Authority | 0.58% |
| Port of Seattle WA | 0.57% |
ALTBX Prospectus and SEC Filings
Official AB National Portfolio filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
Related Funds
Other Long 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.