web3: As U.S. stocks reach new highs, VIX sees a rare simultaneous rise
CNBC
08-06 03:33
Ai Focus
During the rise in U.S. stocks, VIX rose in tandem with the stock index, indicating a significant increase in demand for bullish options.
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美股本周走强之际,华尔街一项常见判断出现偏离:股市上涨时,代表市场波动预期的 VIX 通常会回落,但这一次却与股指一同上升。市场人士认为,背后主要是看涨期权需求突然放大,推高了期权价格,也抬升了隐含波动率。

看涨期权成交创纪录

周二,标普 500 指数大涨 1.8%,并带动市场情绪迅速升温。与此同时,被称为“恐慌指数”的芝商所波动率指数 VIX 当天反而上升 1 点。周三早盘,股指继续走高时,VIX 也一度同步上行;直到盘中市场转弱后,VIX 才随之回落。

这种股市与 VIX 同涨的情况并不常见,但也并非首次出现。报道援引市场数据称,这类联动大约占两者走势关系的两成,通常出现在 VIX 处于较低水平、且市场快速上行时大量资金集中买入看涨期权的阶段。

期权价格被需求推高

芝加哥期权交易所数据显示,周二标普 500 指数看涨期权成交量超过 400 万张,创历史新高。与此同时,纳斯达克 100 指数一倍标准差看涨期权的价格单日上涨 42%,为近五年来最大单日升幅。

这意味着,市场并非因为避险需求上升而推高 VIX,而是因为看涨情绪过热,带动期权买盘集中涌入。期权价格上升后,隐含波动率也被一并抬高,进而让 VIX 在股市上涨时仍维持强势。

另一个能反映情绪的数据是看跌看涨期权比率。周二该比率降至 0.83,为历史第二低水平,显示资金明显偏向押注继续上涨。

上涨中的风险也在累积

不过,这种结构也意味着部分看涨期权的持有成本已明显抬高。尤其是那些执行价远高于现价的看涨期权,在价格和波动率都被推高后,继续追高的性价比下降。

如果后续股指回落,且隐含波动率同步下降,这类期权可能面临双重压力:标的价格走弱,期权估值也因波动率回落而缩水。周三盘中股市与 VIX 一同下跌时,这种情况已开始出现。

对于不愿减持股票、但担心市场波动加大的投资者而言,这种环境也提供了另一种对冲思路。如果股市继续像周二那样上涨,股票与波动率对冲头寸可能同时受益;若市场突然大幅回落,VIX 通常也会走高,对冲工具仍可能发挥作用。

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