This is the official mega-thread for those looking to apply to internships in S&T, commodities trading and quantitative finance.
Banks:
BBs
Goldman Sachs
Morgan Stanley
JPMorgan
BAML
Credit Suisse
Citi
Deutsche Bank
Barclays Investment Bank
UBS
Other Balance Sheet Banks
Nomura
HSBC
SocGen
RBC
Investec
RBS (Natwest Markets)
BNP Paribas
Standard Chartered
Lloyd's
Santander
UniCredit
Mizuho
Commerzbank
Mitsubishi UFG
ING CB
Credit Agricole
Commodities:
BP IST
Glencore
Trafigura
EDF Trading
RWE Supply and Trading
Maersk Trading
Shell
ExxonMobil
Gunvor
Prop Shops
Jane Street
Virtu Financial
Optiver
SIG
Hudson River Trading
Chicago Trading Company (CTC)
IMC
TransMarket Group
Five Rings Capital
Flow Traders
Jump Trading
Maven Securities
DRW Trading
XR Trading
Hedge Funds (mostly quant, but not strictly):
Man Group
BlueCrest
Brevan Howard
Bridgewater
G-research
Citadel
Oxford Asset Management
Two Sigma
GSA Cap Partners
AQR Capital
Ares
Bain Credit
Engineer's Gate
Cantab Capital
DE Shaw