Bank of America or THE Bank of America?

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Shares of most big banks have sunk this year. But Bank of America's stock has performed much worse than the KBW Bank Index.

NEW YORK (CNNMoney.com) -- Is Bank of America literally destined to become THE Bank of America?

The Charlotte-based banking giant has already received $45 billion in taxpayer money. And the scary thing is that some think it may need even more to survive....possibly even an outright takeover by the government.

Shares tumbled nearly 18% early Thursday morning before bouncing back sharply later in the day and clawing into positive territory. Shares finished up 4%

But at one point Thursday, the stock was trading below $4 a share, its lowest point in more than 20 years.

That followed an 11% plunge Wednesday amid renewed speculation of nationalization.

BofA (BAC, Fortune 500) is struggling to digest the acquisitions of Merrill Lynch and mortgage lender Countrywide, and nothing it has done lately has given investors reason to be hopeful.

On Wednesday, BofA said that to cut costs it would sell three of its corporate jets and a helicopter it inherited in the Merrill deal.

Last week, the bank unveiled what it called its Lending and Investing Initiative, essentially a promise to track and report how it is using money from the government's Troubled Asset Relief Program, or TARP.

But those moves have been rightfully ignored by investors as little more than attempts to boost the bank's image.

BofA is hardly the only bank that has gotten whacked this week. Also getting hit were Citigroup (C, Fortune 500), JPMorgan Chase (JPM, Fortune 500) and Wells Fargo (WFC, Fortune 500).

That's largely due to concerns that the Obama administration might not actually unveil a plan for a so-called "aggregator bank" to buy up the spoiled assets sitting on many banks' balance sheets.

But BofA's stock has been the worst performer by far in recent days. Simply put, the continued weakness in BofA's shares is a sign that something drastic has to be done...stat.

Andrew Marquardt, an analyst with Fox-Pitt Kelton Cochran Caronia Waller, wrote in a research note Thursday morning that there needs to be "new leadership with a clear and consistent strategic plan to manage through the existing tough period."

"Inconsistency and poor vision at the helm has added to lack of conviction and confidence by investors and analysts," he added.

So far, BofA CEO Ken Lewis has continued to have the backing of his company's board of directors. But how much longer will that be the case? Former Merrill CEO John Thain has already lost his job. A spokesperson for Bank of America would not comment about the company's stock price or Lewis' status.

Some are calling for Lewis to go next. Jerry Finger, an investor who owns more than a million shares of BofA through his Houston-based firm Finger Interests, has said in various interviews that he would like to see Lewis step down.

Finger, who could not immediately be reached for comment, is leading a class-action lawsuit against the company. In the complaint, the plaintiffs allege that Lewis and Thain failed to protect shareholder interests when hammering out the BofA-Merrill deal.

But Lewis still has some fans. Richard Bove, an analyst with Ladenburg Thalmann, wrote in a report Thursday morning that "Ken Lewis may be the best operating manager of any bank in the United States."

Bove added that even though "investors believe that this bank is about to fail and be nationalized by the United States government," he thinks that "these fears simply make no sense whatsoever."

He pointed out that BofA, despite its fourth-quarter loss, is still cash-flow positive and that the bank reported a net increase in deposits of nearly $9 billion in the quarter.

Dan Genter, president and CEO of RNC Genter Capital Management, an investment firm in Los Angeles with about $2.7 billion in assets, added that bringing in a new CEO would not necessarily solve the bank's problems. But he conceded that Lewis' job could be in danger.

"I'm hoping they don't make a change. But this is an atmosphere that's punitive. The market is rewarding revenge to some degree," said Genter, whose firm owns a small stake in BofA.

And one hedge fund manager that used to own shares of BofA and Merrill Lynch last year said that he thinks Citigroup is in more trouble than BofA because of Citi's bigger exposure to bad trading bets.

"Nobody really knows what's on Bank of America's balance sheet. But I think you have to draw a distinction between them and Citigroup," said Morris Mark, president of Mark Asset Group, a New York-based hedge fund firm.

Nonetheless, an analyst with one investment firm that sold its stake in BofA late last year said Lewis does deserve blame for taking on all the risks that came with trying to digest two sizable mergers in the face of a severe economic slump.

"Lewis could have weathered this downturn if it was just Bank of America and its assets, but now he's got to deal with Countrywide and Merrill, whose problems I don't think he fully understood," said Virge Trotter, a senior analyst with Manning & Napier Advisors, a money management firm based in Rochester, N.Y.

Trotter added that BofA arguably could have gotten better deals for both Countrywide and Merrill Lynch if they were allowed to collapse first.

He noted how JPMorgan Chase CEO Jamie Dimon waited until he got loan guarantees from the Federal Reserve before deciding to buy investment bank Bear Stearns. And JPMorgan Chase didn't pounce on savings and loan Washington Mutual until after the savings and loan failed and was seized by the FDIC.

"Lewis is the captain of the ship so he has to take some responsibility. It seems that he paid full price last year and got too greedy," Trotter said.