The  All-In-One Guru Screener, can be used to find the most insider buys over the past week by clicking on the insiders tab and changing the settings for All Insider Buying to "1,000,000+ shares at $5,000,000" and Duration to "over the past 7 days."
 Oasis Petroleum Inc (OAS) and HF2 Financial Management Inc. (HTWO) were the two companies with the heaviest buys over the pas week that met the criteria.
10% Owners, Ramsey Neil P. and d.Quant Special Opportunities, purchased 6,670,856 shares of HTWO combined, which totaled $70,044,000. Since then, the price declined by 10%.
HTWO has an Institutional Ownership of 65% and an Insider Ownership of 1%
HTWO has a market Cap of $234.6 billion and over the last year, the price dropped by about 20% and is currently trading at a P/B ratio of 18.40 in relation to the Global Conglomerates Industry Median of 3.67.
The company has a good financial strength and no debt, but it has poor profitability with a negative ROE of -9.65% and a ROA of 0%
Guru Chuck Royce is the only Guru holding HTWO and he increased his position by 59% during the last quarter of 2014
 10% Owner SPO ADVISORY CORP purchased 8,000,000 shares of OAS for a total of $102,400,000. Since that trade, the price rose by 7%.
OAS has an Institutional Ownership of 94% and an Insider Ownership of 6%.
The company has a market Cap of $1.402 billion and over the last year, the price dropped by about 66% and is currently trading at a P/B ratio of 0.80 versus a Global Oil & Gas E&P Industry Median of 8.41.
The company has a good financial strength rating of 7 out of 10, despite a Cash to Debt ratio of 0.02. Profitability is rated 6 out of 10., with ROE at 31%, ROA at 10% and a ROC at 14%.
Over the past 12 months, revenue grew by 13%, EPS by 107% and book value by 38%
Guru John Paulson is the main holder with 9.57% of outstanding shares, followed by Jim Simons with 0.59%.
Gurus Paul Singer, Jim Simons, Ray Dalio and Pioneer Investments bought shares of OAS during the fourth quarter of 2014.
