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AT&T and Acadia post gains while Clorox and Amgen stumble

NEW YORK (AP) — Stocks that moved substantially or traded heavily on Monday:

AT&T Inc., up 54 cents to $36.79

Activist investor Elliott Management announced a $3.2 billion stake in the communications company and called for a shakeup.

Acadia Pharmaceuticals Inc., up $15.05 to $38.85

The biotechnology company reported positive results from a key study of a potential dementia-related psychosis drug.

Clorox Co., down $3.71 to $158.33

The consumer products maker and its peers fell as investors shifted their focus to higher growth holdings.

Bank of America Corp., up 90 cents to $28.63

Banks gained ground on rising bond yields, which help them set more lucrative interest rates on loans.

Amgen Inc., down $5.39 to $202.34

The drug developer reported disappointing study results for a potential lung cancer drug.

Quanta Services Inc., up $1.25 to $35.47

The specialty contractor for utility and energy companies completed its buyout of gas utility contractor The Hallen Construction Co.

Cummins Inc., up $5.92 to $160.82

The engine maker closed its buyout of fuel cell and hydrogen production technology company Hydrogenics Corp.

Schlumberger NV, up $2.03 to $36.23

A jump in oil prices helped boost oil company and oilfield services stocks.