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最近比较火热的一个话题是裸卖put, 裸卖put确实是一种好的策略，也是巴菲特早年比较推崇的策略之一。顺便说一句，巴菲特现在不做股票期权了，因为他的资金量太大，股票期权无法容纳。如果风险控制得当，sell put这一策略可以获得稳定收益。裸卖put实行的是保证金制度，也就是说，你必须有一定量的现金或股票作为保证金才能开仓，且开仓后需维持一定量的保证金。看到有几个虎友分享了他们卖put的历险经历，跌宕起伏，扣人心弦。由于正股大跌，导致保证金急剧上升，为避免被强制平仓，最后不得不自行割肉某些寸头，或者紧急从别处腾挪资金救急。归根结底，是大家对保证金的计算不了解，不重视。很多人开仓完成后就不太关注保证金的变化，尤其是在涨势中。好像没有太大风险。但是，一旦进入跌势，如果你对保证金的计算不了解，将面临被强制平仓的风险。我们开仓之前，必须对最坏的情况做个估计。比如，我开了这么多的仓位，初始保证金是多少，行权日到达之前，股票价格下跌到行权价附近，此时维持保证金变为多少，当股价大幅低于行权价时，维持保证金又会变为多少。关于保证金的计算，各家券商都有自己的算法，但这些算法的基本构架是相似的。各家在基本构架外再考虑一些别的因子。下面就以盈透证券的算法为例来给大家讲讲sell put的保证金算法。Sell put的保证金分为两部分：1，期权金。所获期权金必须拿出来做为保证金的一部分。这部分在整个期权存续期间不会变化。2，由于sell put最坏的结果是要接股票，所以你必须准备一部分资金（现金或股票），但不必准备100%接股票的钱。这部分钱是这样算的：或者20%股票现价减掉虚值额，或者是10%行权价，二者取大者。这样的描述有点烧脑，还是举个栗子吧。比如你卖了目前股价为50元，行权价为40元的put。20%*50=10，虚值额为50-40=10，二者相减等于0，这种情况就选10%行权价作为保证金的一

U.S. stock indexes gained ground on Tuesday with Nasdaq leading the advance as investors were reliev

Dec 29 (Reuters) - The Dow and S&P 500 closed at all-time highs on Wednesday on a boost from retaile

Dec 27 - The S&P 500 indexended at a record high on Monday, its fourth straight session of gains, as strong U.S. retail sales underscored economic strength and eased worries from Omicron-driven flight cancellations that hit travel stocks.U.S. retail sales increased 8.5% year-over-year this holiday season, powered by an ecommerce boom, according to a Mastercard Inc report, giving the S&P 500 retailing indexa boost.Travel-related stocks, typically sensitive to coronavirus news, declined after U.S

As traders return from the holiday-shortened week, the price action heading into the new year will be closely monitored — especially given the relatively light economic data and earnings calendar for the coming days.The S&P 500 is entering the period known for ushering in the so-called Santa Claus Rally, or seasonally strong timeframe for stocks at the end of each year.According to data from LPL Financial, the Santa Claus Rally period encapsulates the seven days most likely to be higher in any

Is now the best time to buy these three Wood picks?

As the year comes to a close, Wall Street analysts are practically falling over themselves with almost daily serious predictions aboutwhat to expect from the tech sector in 2022.So, it should come as no surprise that, like many analysts, MKM Partners managing director Rohit Kulkarni came out with a list of 10 things that could shape the Internet industry next year. However, instead of diving into matters such as revenue growth rates and price-to-earnings ratios, Kulkarni released a slate of "Bla

U.S. health regulators on Thursday authorized the second pill against COVID-19, providing another ea

* Tesla jumps as CEO Musk says he has sold 'enough' stock. * Pfizer rises as oral COVID-19 pill wins approval. Dec 22 - Wall Street's main indexes powered higher on Wednesday in a broad rally after upbeat economic data and hopeful developments about the severity of the Omicron coronavirus variant that is sweeping the world.The S&P 500 gained at least 1% for a second straight session, putting it near record levels, as volatility has ratcheted up in the last month of 2021 following the arrival of

Dec 21 - Wall Street's main indexes ended sharply higher on Tuesday, with strength in travel and tech shares as well as in Nike and Micron Technology following their earnings, as stocks rebounded from a coronavirus-fueled rout the session before.The rapidly spreading Omicron variant of the coronavirus has rattled stock markets around the world, triggering volatility in the final month of 2021, which has otherwise been a strong year for equities.Gains in massive technology and tech-related stock