20170727 納指出現單日轉向，開市市況向上 中午後轉向急劇下跌。

20170727一天圖

 20170728一天圖

201707273個月圖

20170727, 納指出現單日轉向，開市市況向上 中午後轉向急劇下跌。

20170728VOSI的開市評論。The NASDAQ Composite, NASDAQ-100, and S&P 500 finished roughly mid-bar after bouncing off of their 20-demas, but showed negative outside reversals to the downside after starting to the upside yesterday at the opening bell. Also, many leading stocks  mimicked the action of the indexes and posted ugly reversals and outside reversals to the downside off their intraday highs yesterday on heavy selling volume. This looks bearish on its face.

HKT20170728李順威專欄: 美股主要上升界別電訊股、工業股。主要下跌界別是貴金屬股、運輸股和醫療保健股。生化科技股先高後低，動力科技股個別發展，半導體股有回吐。特別的是中國預託證券早段造好。周四美股走勢特點是科技股、動力股Amazon, Nvida遇到沽售，落後的電訊股、地產信托和能源股造好，這一方面是界別轉換。另一方面是政治消息影響：美眾議院議長表示放棄邊境税考慮；邊境税是共和黨國會減税建議的重要部份，市場擔心稅務改革法案可能出現問題，因此出現沽售。

HKT20170729李順威專欄，28日收市後業績公佈，亞馬遜業績差於預期，股價下跌，加上科技股仍有些壓力和月結因素，美股指數偏弱。美股主要上升界別是公用股、石油服務股、貴金屬股。主要下跌界別是半導體股、細價股。銀行股偏弱。中國預託證券被百度好消息帶動反彈。動力科技股反彈，生化科技股先軟後升，醫療保健股亦造好。

7月27日單日轉向已跌(可能因為Amazon業績公佈前再創新高引發回吐)，另加上收市後Amazon業績差於預期，市後時段納指繼續下跌0.7%。28日開市，VIX上升，但納指沒有進一步大跌，只是反覆波動，及後平穩慢慢向上及VIX下跌。

記憶中未有美股7月升市的經驗。以至7月自已忽略了1. 月結，所以先吐利，2.平衡基金調整組合，3.板塊轉換(沽動力股)等因素。

特別是7月納指由7月3日6173點升到27日最高6459點，而自己倉位已上升2成(30萬)。 應該平倉TQQQ獲利及利用短期稍微價外期權或以QQQ去搏取後續的利潤。另外, 亦可預設Trailing Stop或 以(EMA10-EMA20)x2/3+EMA20去訂立STOP order去觸發自動平倉去鎖定利潤。雖然7月未有像6月回調那麼深，亦應引以為鑑。最後，在7月28日平掉所有TQQQ正股及期權，回報則降低至1成。

VoSI Focus List Review for the Week Ended January 28, 2017

General Observations:The general  market was hit with heavy selling volume on Thursday, but the indexes found support around their 20-day exponential moving averages. Then on Friday, the indexes gapped down but held their ground, once again finding support at the 20-dema. The market's direction from here is currently unclear, and there is the possibility for further corrective action. This could come in the form of more downside as support at the 50-dma might come into play, or simply a choppy, volatile range such as we saw back in June.