Bill Whyman, the technology strategist at ISI, has some thoughts on why that is.
Afghanistan and the US have both accused the ISI of links to the Haqqani network.
It may be many bad things, but it is not an arm of the ISI.
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Above all, they want the names of all the ISI men who worked on al-Qaeda.
He described frequent run-ins with the ISI to this correspondent over a recent dinner.
It is not just that the manner of his disappearance carries shades of ISI methods.
Mark Schoenebaum, an analyst at ISI Group, says this price may actually be lower than was expected.
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In an emailed note to clients, Mark Schoenebaum at ISI Group called the news a downside surprise.
He certainly overstated the relationship (the Haqqanis know better than the ISI what to target in Afghanistan).
The new ISI chief visited Washington last week, met with Director Petraeus as well with other top officials.
The note, by the way, carries a 9.5 percent annual rate, according to ISI Group analyst Marc Schoenebaum.
Not huge, says ISI Group analyst Mark Schoenebaum, who had the first report I saw of the news.
"At the end of the day, the numbers are fine, " said Brian Marshall, an analyst at ISI Group.
"It's unfortunate, but we did not know about the people resident in that compound, " the ISI official said.
Afghan government officials have also accused the Pakistan intelligence agency, the ISI, of involvement, a charge Islamabad denies.
Mark Schoenebaum at ISI Group mounted a more spirited defense of Amgen shares toward the end of the day.
The United States has linked the ISI to involvement in previous terrorist attacks.
Mark Schoenebaum, the healthcare research analyst at ISI Group, gave a thorough run-down of what to expect from illuminate.
Experienced investors and bond traders should head to sites like ISI Emerging Markets or Bradynet.com, which give greater detail.
Leon Panetta deals regularly with the Director General of the ISI, General Pasha.
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Or take this argument, recently made by Mark Schoenebaum at ISI Group.
Crucially, did any Pakistani official, perhaps a rogue agent in the notorious Inter Services Intelligence (ISI) agency, protect him?
Pakistan's main military-intelligence body, the ISI (Inter-Services Intelligence), kept the public mood simmering.
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The BBC's Ilyas Khan, in Islamabad, says Mullah Baradar has also been close to the Pakistani intelligence service, the ISI.
But is he concerned with evidence in these documents about civilian casualties, about cooperation between the Taliban and the ISI?
He said accusations of links to the ISI were an attempt "to hide their failure and to confuse peoples' minds".
Many suspect that Punjabi groups are still accorded some kind of protection by the ISI, though the agency denies it.
Mr Zardari is no friend of Mr Musharraf or the army: he has accused the ISI of killing his wife.
So, if elements of the ISI had a hand in this week's atrocities, the Pakistani government can plausibly deny it.
ECONOMIST: Why Pakistan may be America��s most dangerous ally
John Mendelson, ISI technical analyst, told CNBC Thursday that high volume on down days means Apple has 20% lower to go.
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