When Facebook went public, the price didn't rise like a normal IPO. Normally, IPO's are priced so that there's a "pop" on the opening day. Instead the Facebook price fluctuated around the initial price and once support was removed, the price fell below the offering price.

According to the Wall Street Journal:

"As the deal's so-called stabilizing agent, Morgan Stanley could support the stock through a pool of Facebook shares known as a overallotment."

In this context, "support" means keep the stock price higher than it otherwise would be. I see how Morgan Stanley could keep the price lower by releasing more shares from an overallotment pool, but how can they "support" the stock price?

2 Answers 2


There are no "rules" about how the price should act after an IPO, so there are no guarantee that a "pop" would appear at the opening day. But when an IPO is done, it's typically underpriced. On average, the shares are 10% up at the end of the first day after the IPO (I don't have the source that, I just remember that from some finance course).

Also, after the IPO, the underwriter can be asked to support the trading of the share for a certain period of time. That is the so called stabilizing agent. They have few obligations like:

  • Providing liquidity to avoid strong price movement.
  • Supporting the price by buying the share below a certain level.

This price support in often done by a repurchase of some of the shares of poorly performing IPO.

EDIT: Informations about the overallotment pool.

When the IPO is done, a certain number of client buy the shares issued by the company.

The underwriter, with the clients, can decide to create an overallotment pool, where the clients would get a little more shares (hence "overallotment"), but this time the shares are not issued by the company but by the underwriter. To put it another way, the underwriter oversell and becomes short by a certain number of shares (limited to 15% of the IPO).

In exchange for the risk taken by this overallotment, the underwriter gets a greenshoe option from the clients, that will allows the underwriter to buy back the oversold shares, at the price of the IPO, from the clients. The idea behind this option is to avoid a market exposure for the underwriter.

So, after the IPO:

  • If the price goes down, the underwriter buys back on the market the overshorted shares and makes a profits.

  • If the price goes up, the company exercise the greenshoe option buy the shares at the IPO prices (throught the overallotment pool, that is, the additional shares that the clients wanted ) to avoid suffering a loss.

  • 1
    Does that mean that they are not using the overallotment, but rather buying shares? Perhaps in a really backways way they are using the overallotment by INCREASING the overallotment by buying shares. (thanks for the edit BTW, much better)
    – Knox
    May 22, 2012 at 16:13
  • @Knox I edited my answer to explain a little more how this overallotment pool is working. If it's unclear, don't hesitate. But basically there are buying the shares either from the market or from the IPO clients.
    – Mesop
    May 22, 2012 at 16:52

"IPO's are priced so that there's a "pop" on the opening day."

If I were IPOing my company and the price "popped" on the open, I would think the underwriter priced it too low. In fact if I were to IPO, I'd seek an underwriter whose offerings consistently traded on the first day pretty unchanged. That means they priced it correctly. In the 90's IPO boom, there were stocks that opened up 3X and more. The original owners must have been pretty upset as the poor pricing guidance the underwriter offered.

  • Yes, exactly. The goal of the IPO is to get as much money to the company as possible. So if the stocks pop after the IPO it means exactly that the company did the IPO suboptimally.
    – sharptooth
    May 23, 2012 at 7:48
  • You are right, but that's a one sided view of the IPO. Even if the company wants as much money as it can, the investors wants returns for taking the risk of giving money to the company, that is why they are asking for a rebate during the IPO. Else they won't participates. If the price is already the right price then they will only benefits from the dividends, in such case, they are better off buying bonds. Also, if the price goes up, the company can still do SEO to gather more money.
    – Mesop
    May 23, 2012 at 8:01
  • @olchauvin - a one day rise of 10% is sufficient to keep interest in IPOs in general. Since "pop" is not a well defined business word, I inferred it to mean a greater rise than that. May 23, 2012 at 18:29
  • As a company, you do want a good price for your shares in general, but you're also going to be asking someone with a lot of money to buy up a lot of stock that they can't sell immediately (not enough buyers, selling would tank the stock price). That's kind of risky, and without a little bit of a discount relative to the anticipated trading price, fewer investors will be willing to buy.
    – user296
    May 10, 2013 at 20:53

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