When an insider buys shares on inside information, the insider is taking those shares from someone at a discounted price from their true value, which is unknown to the seller.
I agree on the insider trading but imho, the stock market is all about a false balance and is most likely the apparatus behind the idea of Mammon. When Satan takes Jesus up on the high mountain to bribe him, he didn't offer him the world because he was not the owner of it. He offered Christ the kingdoms of the world because that's all he had to offer. Mystery Babylon in Revelation 17 & 18 is not about Rome or the Catholic Church. Nothing in the passage can be construed to prove this theory because Mystery Babylon in its 8 occurrences has always been about Mammon not religion. Mammon is all about the false balance that comes from and is based upon trade. If you notice in the passages below, the whore is a city that rules over kingdoms and nations and has made the "merchants" and kings rich. Also notice how they are made rich and what the merchandise is. No one city can produce all of that merchandise but it can facilitate the speculation of this merchandise through means of a stock market.
If Mystery Babylon / Mammon is all about the stock market, we as believers are to have no part of it or whatever Mystery Babylon is, per Rev. 18:4.
Rev. 17:1 And there came one of the seven angels which had the seven vials, and talked with me, saying unto me, Come hither; I will shew unto thee the judgment of the great whore that sitteth upon many waters:
18 And the woman which thou sawest is that great city, which reigneth † over the kings of the earth.
Rev. 18:2-4And he cried mightily with a strong voice, saying, Babylon the great is fallen, is fallen, and is become the habitation of devils, and the hold of every foul spirit, and a cage of every unclean and hateful bird.
For all nations have drunk of the wine of the wrath of her fornication, and the kings of the earth have committed fornication with her, and the merchants of the earth are waxed rich through the abundance of her delicacies.
And I heard another voice from heaven, saying, Come out of her, my people, that ye be not partakers of her sins, and that ye receive not of her plagues.
Rev. 18:10 Standing afar off for the fear of her torment, saying, Alas, alas, that great city Babylon, that mighty city! for in one hour is thy judgment come.
And the merchants of the earth shall weep and mourn over her; for no man buyeth their merchandise any more:
The merchandise of gold, and silver, and precious stones, and of pearls, and fine linen, and purple, and silk, and scarlet, and all thyine wood, and all manner vessels of ivory, and all manner vessels of most precious wood, and of brass, and iron, and marble,
And cinnamon, and odours, and ointments, and frankincense, and wine, and oil, and fine flour, and wheat, and beasts, and sheep, and horses, and chariots, and slaves, and souls of men.
And the fruits that thy soul lusted after are departed from thee, and all things which were dainty and goodly are departed from thee, and thou shalt find them no more at all.
The merchants of these things, which were made rich by her, shall stand afar off for the fear of her torment, weeping and wailing,
And saying, Alas, alas, that great city, that was clothed in fine linen, and purple, and scarlet, and decked with gold, and precious stones, and pearls!
For in one hour so great riches is come to nought