The 2007–2008 financial crisis, or Global Financial Crisis, was a severe worldwide economic crisis that occurred in the early 21st century. It was the most serious financial crisis since the Great Depression.

In 2007, the U.S. subprime mortgage market collapsed, sending shockwaves throughout the market. The effects were felt across the globe, and even caused the failure of several major banks including Lehman Brothers but some investors saw the massive sell-off as a chance to increase their positions in the market at a big discount .

1.Warren Buffett

In October 2008, Warren Buffett published an article in The New York Times op-ed section declaring he was buying American stocks during the equity downfall brought on by the credit crisis. His derivation of buying when there is blood in the streets is to "be fearful when others are greedy, and be greedy when others are fearful."

Buffett was especially skilled during the credit debacle. His buys included the purchase of $5 billion in perpetual preferred shares in Goldman Sachs ( GS ) that paid him a 10% interest rate and also included warrants to buy additional Goldman shares. Goldman also had the option to repurchase the securities at a 10% premium. This agreement was struck between both Buffett and the bank when they struck the deal in 2008. The bank ended up buying back the shares in 2011.

Buffett did the same with General Electric ( GE ), buying $3 billion in perpetual preferred stock with a 10% interest rate and redeemable in three years at a 10% premium.

He also purchased billions in convertible preferred shares in Swiss Re and Dow Chemical (DOW), all of which required liquidity to get them through the tumultuous credit crisis.

As a result, Buffett has made billions for himself, but has also helped steer these and other American firms through an extremely difficult period.

2. John Paulson

Hedge fund manager John Paulson reached fame during the credit crisis for a spectacular bet against the U.S. housing market. This timely bet made his firm, Paulson & Co., an estimated $20 billion during the crisis.

He quickly switched gears in 2009 to bet on a subsequent recovery and established a multi-billion dollar position in Bank of America ( BAC ) as well as an approximately two million shares in Goldman Sachs.

He also bet big on gold at the time and invested heavily in Citigroup (C), JP Morgan Chase ( JPM ), and a handful of other financial institutions.

Paulson's 2009 overall hedge fund returns were decent, but he posted huge gains in the big banks in which he invested. The fame he earned during the credit crisis also helped bring in billions in additional assets and lucrative investment management fees for both him and his firm.

3.Jamie Dimon

Though not a true individual investor, Jamie Dimon used fear to his advantage during the credit crisis, making huge gains for JP Morgan. At the height of the financial crisis, Dimon used the strength of his bank's balance sheet to acquire Bear Stearns and Washington Mutual, which were two financial institutions brought to ruins by huge bets on U.S. housing. JP Morgan acquired Bear Stearns for $10 a share, or roughly 15% of its value from early March 2008.

In September of that year, it also acquired WaMu. The purchase price was also for a fraction of WaMu's value earlier in the year.

From its lows in March 2009, shares of JP Morgan more than tripled over 10 years and have made shareholders and its CEO quite wealthy.

4. Ben Bernanke

Like Jamie Dimon, Ben Bernanke is not an individual investor. But as the head of the Federal Reserve (Fed), he was at the helm of what turned out to be a vital period for the Fed. The Fed's actions were ostensibly taken to protect both the U.S. and global financial systems from meltdown, but brave action in the face of uncertainty worked out well for the Fed and underlying taxpayers.

A 2011 article detailed that profits at the Fed came in at $82 billion in 2010. This included roughly $3.5 billion from buying the assets of Bear Stearns, AIG , $45 billion in returns on $1 trillion in mortgage-backed security ( MBS ) purchases, and $26 billion from holding government debt. The Fed's balance sheet tripled from an estimated $800 billion in 2007 to absorb a depression in the financial system, but appears to have worked out nicely in terms of profits now that conditions have returned more to normal.

5.Carl Icahn

Carl Icahn is another legendary fund investor with a stellar track record of investing in distressed securities and assets during downturns. His expertise is in buying companies and gambling firms in particular. In the past, he has acquired three Las Vegas gaming properties during financial hardships and sold them at a hefty profit when industry conditions improved.

To prove Icahn knows market peaks and troughs, he sold the three properties in 2007 for approximately $1.3 billion—many times his original investment. He began negotiations again during the credit crisis and was able to secure the bankrupt Fontainebleau property in Vegas for approximately $155 million, or about 4% of the estimated cost to build the property. Icahn ended up selling the unfinished property for nearly $600 million in 2017 to two investment firms, making nearly four times his original investment.