Managing success: How do active managers handle increasing AUM?

Some larger AUM managers can produce strong returns — but how? Director of investment strategy research, Leola Ross, explores possible reasons and shares our preferences for evaluating managers with increasing AUM.

In part one of this series, we noted that active managers demonstrated the potential to generate strong performance, even with large AUM, across several equity and fixed income strategies and regions. Such an observation may be surprising given our early research on the “Perils of Success,” our continued preference for lower AUM managers and University of California Professor Jonathan Berk's well-known 2005 conclusion:

Competition between them [managers] increases the size of the fund and drives the alpha to zero. Instead the manager himself captures this value through the fee he charges.

In all of these examples, the common link is that size alone can erode success. The most damning, however, is the Berk conclusion. Is it true?

Can active managers kill the goose that lays the golden egg?

And why would investors continue to fund the active manager once the manager has extracted all value?

The charts from our last post suggest that some active managers with large AUM have produced strong excess returns. The charts, also shown below, depict interquartile ranges of 1-year returns (2001-2015), broken out by AUM quintiles, for active managers across various equity regions and fixed income strategies. If the amount of AUM really is such an issue, and if active managers were trying to capture all the value for themselves by taking on too much AUM, it is unlikely that we would observe fifth-quintile managers (across various asset classes and equity regions) with still mostly positive returns.

can managers with more assets outperform

Source: Russell Investments. These are based on observations from products in Russell Investments’ active manager universes. The average number of products per period ranges from approximately 50 to 300 by region.


We suspect that skilled active managers may carefully manage their AUM to have it both ways. A reasonable strategy for them is to collect profits while also providing value to their clients, in the long run.

So, if we have evidence of larger AUM managers producing strong returns (and indications that it’s in their best interests to do so), how do these active managers manage their success? Especially when market impact, costly trading and illiquidity are constantly nipping at their heels?

Better techniques for improving success

We typically see active managers accomplish this by increasing the number of holdings, reducing their active share, reducing turnover and moving toward more liquid stocks. Some managers do this better than others and, through our 48 years of researching managers, we’ve identified some of the better techniques for improving success. To accommodate AUM effectively, we prefer managers that:

  1. Manage growth, so that it doesn't come too quickly
  2. Don’t hide growth in multiple, similar, products
  3. Stay in their habitat (capitalisation, risk profile)
  4. Stay invested (less in cash)
  5. Play liquidity well, are mindful of their investment horizon
  6. Are mindful of cash flow requirements
  7. Employ wise use of derivatives and other capacity expanding securities

Ultimately, our conclusions support an investment community that is mindful of AUM limitations and has learned to manage AUM growth well.