FWIW this would be my list of books every investor should read, which is different from what you should read to work in finance but anyway ...
Capital Ideas: The Improbable Origins of Modern Wall Street by Peter L. Bernstein.
A lively introduction to the theoretical foundations of modern finance and their history, Markowitz, Sharpe, etc.
https://www.amazon.com/Capital-Ideas-Improbable-Origins-Mode...
The Essays of Warren Buffett : Lessons for Corporate America by Warren E. Buffett.
In his own words...you can also find many if not all online, on Berkshire website
https://www.amazon.com/The-Essays-Warren-Buffett-Corporate/d...
Buffett: The Making of an American Capitalist
by Roger Lowenstein.
Insightful biography...The Snowball was written more recently with Buffett's approval, but would read this one first
https://www.amazon.com/Buffett-American-Capitalist-Roger-Low...
Common Stocks and Uncommon Profits and Other Writings
by Philip A. Fisher.
It's not widely appreciated, but Warren Buffett's method is 50% Ben Graham and 50% Phil Fisher. If you can find value stocks that are also great franchises, and hold onto them for dear life, you will be rich... if you also bet big, operate companies well, don't screw up, live in a bull market era and survive long enough, maybe as rich as Buffett.
https://www.amazon.com/Common-Stocks-Uncommon-Profits-Writin...
The Intelligent Investor: A Book of Practical Counsel
by Benjamin Graham.
Classic introduction to value investing
https://www.amazon.com/The-Intelligent-Investor-Practical-Co...
Unconventional Success: A Fundamental Approach to Personal Investment
by David F. Swensen.
Asset allocation, and the perils of mutual funds...leading endowment investor of our time (Yale) gives his advice for individuals
https://www.amazon.com/Unconventional-Success-Fundamental-Ap...
The Most Important Thing: Uncommon Sense for the Thoughtful Investor
by Howard Marks.
Lessons in investing... at any time, any one of them can be 'the most important thing' and so they all are jointly and severally 'the most important thing'.
https://www.amazon.com/The-Most-Important-Thing-Thoughtful/d...
The Investor's Anthology: Original Ideas from the Industry's Greatest Minds (Vols 1 and 2)
by Charles D. Ellis (Editor), James R. Vertin (Editor).
Essays from a broad selection of writers
https://www.amazon.com/The-Investors-Anthology-Industrys-Inv...
https://www.amazon.com/Classics-II-Another-Investors-Antholo...
The Money Masters;
The New Money Masters;
Money Masters of Our Time,
by John Train.
Methodologies of all-time great money managers, in their own words
https://www.amazon.com/The-Money-Masters-John-Train/dp/08873...
https://www.amazon.com/Money-Masters-Time-John-Train/dp/0887...
https://www.amazon.com/New-Money-Masters-John-Train/dp/08873...
Market Wizards;
The New Market Wizards;
Hedge Fund Market Wizards,
by Jack D. Schwager.
Interviews of successful traders
https://www.amazon.com/Market-Wizards-Jack-D-Schwager/dp/088...
https://www.amazon.com/The-New-Market-Wizards-Conversations/...
https://www.amazon.com/Hedge-Fund-Market-Wizards-Winning/dp/...
Manias, Panics, and Crashes: A History of Financial Crises
by Charles P. Kindleberger.
Why good markets go bad
https://www.amazon.com/Manias-Panics-Crashes-Financial-Inves...
Reminiscences of a Stock Operator
by Edwin Lefevre.
Fictionalized biography of a famed early-20th century trader
https://www.amazon.com/Reminiscences-Stock-Operator-Edwin-Le...
A Random Walk Down Wall Street: The Best and Latest Investment Advice Money Can Buy
by Burton G. Malkiel.
Reality check from an efficient market theorist
https://www.amazon.com/Random-Walk-Down-Wall-Street/dp/03933...
This is a rollicking good read on links between Shannon, Kelly, Thorpe, who wrote 'Beat the Dealer' and was maybe the first hedge fund legend https://www.amazon.com/Fortunes-Formula-Scientific-Betting-C...
And maybe something on technical analysis, but not really sure what to recommend...a lot of people view it kind as mumbo jumbo, but I kind of think fundamentals are like playing your poker hand, technicals are like playing the opponents' tells...the chart gives you an idea of who owns it at what price, what levels might make people rethink positions. Maybe this one as an easy intro, dumb title notwithstanding https://www.amazon.com/Stan-Weinsteins-Secrets-Profiting-Mar...