The Russell 2000 ended the year on a sour note over unease about where interest rates could go. In this episode of Inside Active, host David Cohne, mutual fund and active-management analyst with Bloomberg Intelligence, along with co-host Michael Casper, US small-cap and sector strategist at BI, spoke with John Barr, managing director at Needham Funds and portfolio manager for the Needham Aggressive Growth Fund (NEAGX) about hidden quality compounders and why investing with a margin of safety is crucial for long-term success. They also discussed why owning established businesses helps with downside protection, why founders are a shortcut to finding great management and how meeting with private companies can help with long-term success.

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