VTEC is passively managed to provide broad exposure to California muni bonds. The fund holds USD-denominated municipal bonds issued in California, whose interest is exempt from US and California income taxes and the alternative minimum tax (AMT). Eligible securities must have a rating of at least investment grade, a minimum par amount of $15 million, and a remaining term to maturity of at least one month. The fund uses a sampling strategy to track the market value-weighted index, which rebalances monthly. As with all Vanguard ETFs, VTEC only discloses its holdings monthly.