Morningstar Medalists currently represent about 10% of mutual funds available for sale in the U.S.

Morningstar (MORN) said Monday that it changed the ratings on 10 funds in August.

According to the fund-research group, its research analysts upgraded three U.S. fund ratings and downgraded ratings for two funds last month. Also, analysts affirmed ratings for 35 funds and six target-date series and assigned five new ratings.

The Morningstar Analyst Rating for funds represents analysts’ conviction in the fund’s ability to outperform on a risk-adjusted basis over the long term.

Its five-tiered, qualitative Morningstar Analyst Rating scale has three positive levels or Morningstar Medalists — gold, silver and bronze — in addition to neutral and negative ratings.

As of Aug. 31, 133 U.S. funds have a gold rating, 280 funds had a silver rating and 347 funds had a bronze rating. There are 281 funds with a neutral rating and 32 with a negative rating.

Morningstar Medalists currently represent about 10% of mutual funds available for sale in the United States and 58% of assets under management. The analysts rate about $8 trillion of U.S. investor assets, or roughly 70% of total investor assets in the United States.

Wordlwide, the research firm (which is based in Chicago) has more than 100 manager research analysts covering some 4,000 funds. The company provides data on roughly 90,000 open-end mutual funds, 9,500 closed-end funds and 11,600 exchange-traded product listings.

Read on for the latest Morningstar analyst rating changes:

Morningstar Upgrades (from August 2015)

  • Natixis ASG Global Alternatives A to Bronze from Neutral
  • Vanguard High-Yield Corporate Inv. to Silver from Bronze
  • Vanguard Long-Term Investment-Grade Inv. to Silver from Bronze

Morningstar Downgrades

  • Dreyfus Appreciation Investor to Bronze from Silver
  • Weitz Partners Value Investor to Silver from Gold

Morningstar New Ratings

  • AQR Large Cap Multi-Style N. to Bronze (from none)
  • Harbor Mid Cap Value Institutional to Bronze
  • PIMCO Mortgage Opportunities A to Bronze
  • SunAmerica Focused Dividend Strategy A to Bronze
  • USAA Tax Exempt Intermediate-Term to Bronze

 — Check out Top 10 Mutual Fund Firms Most Trusted by Advisors: Cogent on ThinkAdvisor.