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Warren Buffett and Charlie Munger used concentrated stock positions to compound wealth. The methods ... More behind the strategy are examined along with data on the risks. (Photo credit should read JOHANNES EISELE/AFP via Getty Images)AFP via Getty Images Charlie’s portfolio was concentrated in very few securities and therefore his record was much more volatile but it was based on the same discount-from-value approach. He was willing to accept greater peaks and valleys of performance, and he happens to be a fellow whose whole psyche goes toward concentration, with the...

Solar stocks rebounded on Friday but were still on track to close out the week with steep losses as Wall Street assesses last-minute changes slipped into the tax-and-spending bill approved by the House this week, which threaten to disrupt the industry. SolarEdge (SEDG), Sunrun (RUN), Complete Solaria (SPWR), and Enphase Energy (ENPH) were among the biggest decliners this week, all down double-digit percentages. Most of the damage to the sector came on Thursday after the “big, beautiful bill” passed by one vote called for ending key investment and production tax...