The name and mark, Phalanx, can be used to almost any industry. From capital markets, investments, legal & law, film & media, to safety and property protection.
The Greeks are regarded in history as the guardians of western civilization and democracy. They've shown a high degree of experience, integrity, credibility, strength, etc. -- qualities that any company or business would like to project.
What makes this logo simple, unique, clever and memorable is in the visual details -- it's a greek hoplite helmet with the letter P forming the helmet's nose and eye area while the negative space forms the overall shape of the helmet.
*** The text "SECURITIES" is just a placeholder and I'm willing to customize and substitute for other words.
Even the word "PHALANX" can be changed to any word that starts with the letter P and can be associated with the ideas mentioned above.