請問加拿大國家鐡路盤後 - 股票

---請問一下
加拿大國家鐵路公司(cni-us)為何盤後大跌5%
我看google新聞只有說
Capital Guardian Trust Company Lifted Canadian National Railway Co (CNI)
Holding By $9.95 Million, Dcp Midstream LP (DCP) Shorts Down By 3.02%
July 6, 2017 - By Louis Casey

Capital Guardian Trust Company increased Canadian National Railway Co (CNI)
stake by 10.97% reported in 2016Q4 SEC filing. Capital Guardian Trust Company
acquired 148,477 shares as Canadian National Railway Co (CNI)’s stock rose
4.48%. The Capital Guardian Trust Company holds 1.50M shares with $101.17M
value, up from 1.35M last quarter. Canadian National Railway Co now has
$61.55B valuation. The stock decreased 0.60% or $0.49 during the last trading
session, reaching $81.39. About 1.01 million shares traded or 7.31% up from
the average. Canadian National Railway (USA) (NYSE:CNI) has risen 30.03%
since July 6, 2016 and is uptrending. It has outperformed by 13.33% the
S&P500.

不知是否為減資還是增資的原因?
謝謝各位

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