Thomson Reuters has named the winners of the Lipper U.S. Fund Awards for 2015. The select group of fund families was recognized recently at a ceremony in New York, with TIAA-CREF and MassMutual Retirement Services collecting the top group awards for the large and small categories, respectively. Other top group winners include the Oakmark Family of Funds for best large equity-fund group, Hotchkis & Wiley Capital for best small equity-fund group.

Lord Abbett received the best large fixed-income fund group award, while Guggenheim was acknowledged as the best small fixed-income fund group. American Funds won an award for best large mixed-assets fund group, and Thrivent Asset Management was named best small mixed-assets fund group.

“This year as in years past, the Lipper Fund Awards winners have exhibited a high level of skill and talent in navigating the ever complex and interconnected markets of today,” said Robert Jenkins, head of Lipper Research at Thomson Reuters, in a statement. “We at Lipper congratulate the 2015 Award winners for their demonstrated expertise and for delivering outperformance to their collective fund shareholders.”

To be recognized in the large category, a fund family must have at least five equity, five bond or three mixed-asset portfolios in the respective asset classes; this number is three for the small category. The broadest awards are given to the fund families with the lowest average decile rank of the three-year consistent return measure of the eligible funds per asset class and group.

Over the different time periods, Lipper’s scores reflect a fund’s historical risk-adjusted returns relative to funds in the same Lipper classification and include each fund’s expenses and reinvested distributions, but exclude sales charges. The highest Lipper Leader for Consistent Return value within each eligible classification determines the fund classification winner over three, five or 10 years.

“I’m of two minds about our award winners: on one hand, it’s satisfying seeing funds and groups repeat, because it tells us that with the right management excellence and consistency can go together,” explained Jeff Tjornehoj, head of Lipper Research-Americas, in a press release. “And on the other hand, declaring new winners reminds us that this is a competitive industry and no one’s entitled to win.”

Lipper data covers more than 285,000 share classes and over 129,000 funds in 62 markets. Among nearly 70 funds receiving U.S. awards, eight funds—such as the PIMCO Fixed-Income Shares Fund, T. Rowe Price Maryland Tax-Free Bond Fund and GMO Emerging Country Debt Fund, topped rival funds for the most 3-, 5- and 10-year periods.

Fidelity Investments said 16 of its fund won 19 Lipper awards, up from 15 funds receiving 18 awards a year ago. Among the winner funds were the Fidelity Advisor Biotechnology Fund, Fidelity Advisor Energy Fund, Fidelity Advisor Income Replacement 2042 Fund, Fidelity Advisor Real Estate Fund, Fidelity Advisor China Region Fund and Fidelity Advisor International Real Estate Fund.

In addition, Janus Capital Group announced that the Janus Balanced Fund (Class D shares) received a 2015 Lipper Fund Award for the best mixed-asset target allocation moderate Fund for the latest 10-year period.