The following commentary comes from an independent investor or market observer as part of TheStreet's guest contributor program, which is separate from the company's news coverage.NEW YORK ( Insider Monkey) -- Patrick McCormack's Tiger Consumer Management is one of the many from Tiger Management. Like its brethren, the fund is housed at 101 Park Avenue in Midtown Manhattan. Founded in 2006, Tiger Consumer does not change its net exposure based on a market or economic view. Instead, it concentrates on two governing factors to its growth -- liquidity and research capacity -- according to McMormack's letter to investors in 2010. In late January, we found that McCormack's top 10 positions at the end of September returned 19% since then. The large positions in McMormack's portfolio continue similarly decent performance this year. Since the beginning of 2012, the top 10 positions at the end of December returned 18%, vs. 11% for the S&P 500 index in the same period. The top three positions in McCormack's portfolio were Kraft ( KFT), Dollar General ( DG) and McKesson ( MCK). Dollar General returned 13% and McKesson delivered an 18% return since the beginning of this year. Kraft is the third-worst-performing position in our list, gaining only 4%. Follow TheStreet on Twitter and become a fan on Facebook. The best performing among the stocks in McMormack's portfolio is Priceline.com ( PCLN). The stock is up 53% since the beginning of this year, beating the market by 42 percentage points. McCormack increased his Priceline stakes by 16% during the fourth quarter of 2011 -- a rather well-timed bet by the looks of it. At the end of last year, Tiger Consumer reported to own $58 million worth of Priceline shares. Many other Tiger Cubs were bullish about Priceline. Stephen Mandel, Chase Coleman, Andreas Halvorsen and John Griffin were all among the top five hedge fund managers most bullish about Priceline. Coleman had $570 million invested in this position. Express Scripts ( ESRX) is also generating a strong return this year. To date, the stock is up 32%, outperforming the market by over 20 percentage points. Express Scripts is a new position in McMormack's portfolio. During the fourth quarter, Tiger Consumer initiated a brand new $53 million investment in Express Scripts. Stephen Mandel was in favor of Express Scripts as well. His Lone Pine Capital had over $600 million invested in this position at the end of 2011. Christopher James' Partner Fund Management also had nearly $600 million invested in Express Scripts.