Hi Daniel, please consider www.dxfeed.com if you are connecting from NY4 or NY5

How do you define low latency? For home or even semi professional trading all the major brokers, IB, Think or Swim, etc will work. Bloomberg has similar speed, but if you want low latency you'll probably want to co-lo and parse it yourself or use a parser like Activ financial. Really just depends on your specific needs. Obviously the online brokers are super cheap, fast and reliable, but if you need to measure in sub millisecond they will likely be slower than something more professionally geared.

iqfeed is very stable and has an open api which makes it very flexible. Been using them for years.

Thanks to all. We are installing our platform at a colocation facility and it is used by professional traders and money managers. therefore proven data providers are important. we will look into each suggestion. thanks again

Daniel, my firm provides the fastest, low latency market data in each of the three NJ datacenters (NY4, Carteret, and Mahwah). You will not find a faster non-microwave source of market data. www.r2g.com Feel free to reach out via LinkedIn or call the number on the site. Questions for you to think about: Which specific data feeds do you need? Native or normalized? Do you just want local data in each colo or all data in all colo? For example, Bats is located in NY4. Do you want BYX, BZX, EDGA, and/or EDGX? Top of Book or Depth of Book? Do you want Bats via a local handoff inside NY4 or also in Carteret and Mahwah?

If you need ultra low latency, microwave is the only game in town. Research McKay brothers or vigilant global.

NASDAQ FAST or ITCH.

all datafeed providers like Interactive Brokers, Bloomberg , or iqfeed has same acess to exchange, 1-2 ms, but if you think in HFT you need aswell a good API or DMA, for trading execution and second VPS for speed 1-5 ms, if you trade US futures Aurora server( chigago) or stocks (NJ) . fell free to contactme if you have any question.

QuantHouse

Activ, http://www.activfinancial.com/products/activfeed

better access raw data directly at exchanges' matching engines. every exchange has a list of its Licensed Market Data Distributors. e.g. CME's list is at http://www.cmegroup.com/market-data/licensed-distributors.html. the same is for other exchanges

Daniel - many of the largest options market makers on the US exchanges use the low latency corporate events feeds from www.wallstreethorizon.com

How low latency do you want? Iqfeed / nanex are good. If you have to ask you probably arent collocated.

Daniel, TNS can provide you with low latency raw market data feeds directly from the exchange. https://www.tnsi.com/products-services/financial/. If you need normalized market data, let me know. I can refer some providers.

A quick interrogation of 3di's Profiler platform with your specific requirements delivered a range of options, including many of the providers mentioned by other respondents. For example:

- ICE Data Services offers low latency options and access to 450 real-time data feeds through the ICE Data Consolidated Feed.

- Thomson Reuters Elektron offers extremely low latency data feeds and includes US equity markets.

- Celoxica provides accelerated market data feed handlers for the financial markets in the US.

Other services include: Colt's PrizmNet, Fixnetix, QuantHouse, Vela, Active Feed, plus feeds directly from the Exchanges, as mentioned above.

Good luck in your search!

Thomson Reuters Elektron

My experience shows clearly that you got to connect directly to the exchange. Alina's right.

Aside from data providers, (many listed above), you also want to take into consideration, Savvis & Equinix, as well as the Co-Location service providers, i.e. TELX.