Jane Street Benefits

90% book reimbursement for work-related books

tons of in-office perks; food, gym. Lots of employer-sponsored extracurriculars when interns are around in the summer and winter.

It's great (and by "it" I mean the benefits package)

The 401k plan and insurances are all very good. Benefits in general are generous for employees. Free breakfast and lunch for all employees.

Amazing benefits. 401(k) with generous matching program (100% of up to 6%), which starts immediately and is vested. Health/Dental/Vision is completely paid for with only small copays. Office caters breakfast and lunch, and you can also order food from a restaurant on the company dime. The office is filled with snacks, fruit, drinks, coffee, candy, and tea, which is all complimentary. The vacation starts at 15 days per year, and grows to 20 days after a few years. Unlimited sick days (but use discretion). All NYSE holidays are observed (the six plus MLK/President's/Good Friday) and paid. Have access to a tax-free commuting and health account. Paid maternal and paternal leave. On-site gym, outside speakers come in monthly. Many company social events, including skyboxes at Madison Square Garden and others. Hard to beat these benefits anywhere.

Interns don't get perks, so I don't have much to say about this.

you make a lot of money at the cost of working your butt off

Medical Insurance, good insurance .