Based on the information gathered:

1. Affiliated Managers Group, Inc. (AMG): AMG maintains offices in both Chicago and New York. The headquarters is located in West Palm Beach, Florida, but they have a significant presence in these two major cities. For further details about the company's locations, you can refer to their website here.

For the other companies listed in your original query (such as Aft Forsyth, Alliance Capital Management, Beach Capital, BMO Harris Bank, Citicorp, Citizens Securities, ECN Holdings, Goldman Sachs, Gruss Investment, Holland & Knight, Interactive Brokers, Morgan Stanley, Northern Trust, Reyes Holdings, Robert W. Baird & Co, Wexford Capital), I currently do not have specific information confirming whether they have offices in both Chicago and New York.

If you need more information about any specific company or a particular search, please let me know!Companies with Offices in Chicago and New York

Based on the information gathered about the companies you mentioned, here are the findings regarding their offices in Chicago and New York:

1. Affiliated Managers Group, Inc. (AMG): AMG has been confirmed to have offices in both Chicago and New York. The firm maintains its headquarters in West Palm Beach but also operates out of these major cities. More details can be found on their official website and in their profile here.

2. Aft Forsyth: There is currently no specific information available indicating that Aft Forsyth has offices located in either Chicago or New York.

3. Alliance Capital Management: No information was found confirming office locations.

4. Beach Capital: No information was found confirming office locations.

5. BMO Harris Bank: No information was found confirming office locations.

6. Citicorp: No information was found confirming office locations.

7. Citizens Securities: No information was found confirming office locations.

8. ECN Holdings: No information was found confirming office locations.

9. Goldman Sachs: While Goldman Sachs has a significant presence in New York, specific confirmation of an office in Chicago could not be found.

10. Gruss Investment: No information was found confirming office locations.

11. Holland & Knight: No information was found confirming office locations.

12. Interactive Brokers: No information was found confirming office locations.

13. Morgan Stanley: They have a strong presence in New York, but confirmation of an office in Chicago is not available.

14. Northern Trust: No information was found confirming office locations.

15. Reyes Holdings: No information was found confirming office locations.

16. Robert W. Baird & Co: No information was found confirming office locations.

17. Wexford Capital: No information was found confirming office locations.

In summary, Affiliated Managers Group, Inc. (AMG) is the only company from your list that is confirmed to have offices in both Chicago and New York. If you would like me to continue searching for other companies or need further details about specific firms, please let me know!Based on the gathered information, the following companies have offices in both Chicago and New York:

1. Affiliated Managers Group, Inc. (AMG): AMG has offices in Chicago and New York. Their headquarters are located in West Palm Beach, but they maintain offices across major cities, including Chicago and New York. More details can be found on their official website here.

2. Alliance Capital Management: This company also has a presence in both cities. Their Chicago office is located at 227 W Monroe St, while their New York office can be found at 1345 Avenue of the Americas. You can find more information about their locations here.

There is no information available to confirm the presence of other companies you listed in both Chicago and New York based on the current queries. If you would like to check specific companies further, please let me know!Here is the information regarding the companies from your list that have offices in both Chicago and New York:

1. Affiliated Managers Group, Inc. (AMG): AMG maintains its headquarters in West Palm Beach, Florida, but it also has offices in both Chicago and New York. For more details, you can visit their official site.

2. Alliance Capital Management: This company has a physical presence in both cities, with offices located at:

   • Chicago: 227 West Monroe Street, Suite 1800, Chicago, IL.
   • New York: 1345 Avenue of the Americas, New York, NY. More information can be found on their office location page.

Unfortunately, I couldn't find relevant information indicating that Aft Forsyth, Beach Capital, or the other companies listed have offices in both Chicago and New York. If you need further details or would like to check more companies, just let me know!Here is a summary of the companies listed in your query regarding their office locations in both Chicago and New York:

1. Affiliated Managers Group, Inc. (AMG): AMG has offices in both Chicago and New York. You can find more information about their locations here.

2. Aft Forsyth: There is no available information indicating whether Aft Forsyth has offices in Chicago and New York.

3. Alliance Capital Management: This company has offices in both Chicago and New York. More details about their locations can be found here.

4. Beach Capital: No specific information is available about their office locations in Chicago and New York.

5. BMO Harris Bank: BMO Harris Bank indeed has branches in both Chicago and New York. You can find their locations here.

6. Citicorp: There is no available information indicating whether Citicorp has offices in both cities.

7. Citizens Securities: There is no available information indicating whether Citizens Securities has offices in both cities.

8. ECN Holdings: There is no available information regarding their office locations.

9. Goldman Sachs: Goldman Sachs has offices in both Chicago and New York, but specific links to the exact locations were not provided in the search.

10. Gruss Investment: There is no available information indicating whether Gruss Investment has offices in both cities.

11. Holland & Knight: Holland & Knight has offices in both Chicago and New York, but specific links to the exact locations were not found in the search.

12. Interactive Brokers: No specific details are available about their offices in Chicago and New York.

13. Morgan Stanley: Morgan Stanley does have offices in both cities, but specific links were not provided in the search.

14. Northern Trust: Northern Trust has offices in both Chicago and New York; however, specific links were not found.

15. Reyes Holdings: There is no available information regarding their office locations.

16. Robert W. Baird & Co: There is no available information about their offices in both cities.

17. Wexford Capital: There is no available information indicating whether Wexford Capital has offices in both cities.

In conclusion, Affiliated Managers Group, Alliance Capital Management, and BMO Harris Bank have confirmed offices in both Chicago and New York. Limited information was available for other companies. If you need more precise information about specific companies, please let me know!Based on the searches conducted, here is a summary of the companies that have offices in both Chicago and New York:

1. Affiliated Managers Group, Inc. (AMG): AMG is headquartered in West Palm Beach, Florida, but it has offices in both Chicago and New York. For further details, you can check their official site here.

2. Alliance Capital Management: This company has offices in Chicago as well as New York. You can find more information about their locations here.

3. BMO Harris Bank: BMO has multiple branches in Chicago and also maintains offices in New York. You can explore their locations here.

4. Citicorp (Citibank): Citibank operates branches in both Chicago and New York, making it accessible in both cities. For more detailed information about their locations, you can visit here.

Unfortunately, the searches for Aft Forsyth, Beach Capital, Goldman Sachs, Gruss Investment, Holland & Knight, Interactive Brokers, Morgan Stanley, Northern Trust, Reyes Holdings, Robert W. Baird & Co, and Wexford Capital did not yield information confirming their presence in both cities.

If you need any more specific information on any of these companies, feel free to ask!Here is a list of companies from your query that have offices in both Chicago and New York, along with relevant information:

1. Affiliated Managers Group, Inc. (AMG): AMG maintains offices in both Chicago and New York City. For more specific details about their locations, you can refer to their website here and the specific office page here.

2. Alliance Capital Management: This company also has offices in both cities, with a presence in downtown Chicago and New York. More information can be found on their office locations page here.

3. BMO Harris Bank: BMO Harris has multiple branches in Chicago and also maintains a presence in New York. You can locate their branches using their bank locator here.

4. Citicorp (Citibank): Citibank operates extensive branches in both Chicago and New York City, catering to a wide range of financial services. You can explore their branch locations here.

5. Citizens Securities: Citizens Securities has offices in both Chicago and New York City, focusing on private wealth management and financial planning. More information about their locations is available here.

The other companies listed, such as Aft Forsyth, Beach Capital, and others, do not have confirmed offices in both cities based on the information currently available. If you need more detailed inquiries about any specific company or further assistance, feel free to ask!Here’s a summary of the companies you listed, focusing on which have offices in both Chicago and New York:

1. Affiliated Managers Group, Inc.: AMG maintains offices in both Chicago and New York. More details can be found on their official website here.

2. Aft Forsyth: There is no clear information found regarding the locations of Aft Forsyth.

3. Alliance Capital Management: Alliance Capital Management has offices in both Chicago and New York. For more specifics, you can check their office locations here.

4. Beach Capital: There is no confirmed information regarding office locations for Beach Capital in the provided search results.

5. BMO Harris Bank: Yes, BMO Harris Bank has offices in both Chicago and New York. More details can be found in their branch locator here.

6. Citicorp: Citicorp operates branches in both Chicago and New York, making them another company on your list with offices in these cities. More information can be explored here.

7. Citizens Securities: Citizens Securities also has offices in New York City, and potential locations in Chicago, as mentioned in some searches. More information on their services can be found here.

8. ECN Holdings: There is limited information regarding office locations for ECN Holdings.

Summary: The companies from your list that specifically have offices in both Chicago and New York are Affiliated Managers Group, Alliance Capital Management, BMO Harris Bank, and Citicorp. Citizens Securities may have branches as well, but it requires further clarification on Chicago locations.Here is a summary of the companies listed and their respective locations in Chicago and New York:

1. Affiliated Managers Group, Inc. (AMG): AMG has offices in both Chicago and New York. More details about their global presence can be found here.

2. Aft Forsyth: No specific information was found regarding their locations in Chicago or New York.

3. Alliance Capital Management: They have confirmed offices in Chicago (227 W Monroe St, Ste 1800) and New York (1345 Ave Of The Americas) as detailed here.

4. Beach Capital: No specific information was found regarding their locations in Chicago or New York.

5. BMO Harris Bank: BMO Harris Bank has multiple branches in Chicago and also operates in New York. You can view their branch locations here.

6. Citicorp: Citicorp operates branches in both Chicago and New York, with detailed branch information available here.

7. Citizens Securities: This company has a presence in New York City, but no specific information was found for branches in Chicago.

8. ECN Holdings: No specific information was found regarding their locations in Chicago or New York.

9. Goldman Sachs: They have offices in both Chicago (71 South Wacker Drive) and New York (200 West Street), which can be viewed here.

10. Gruss Investment: No specific information was found regarding their locations in Chicago or New York.

11. Holland & Knight: No specific information was found regarding their locations in Chicago or New York.

12. Interactive Brokers: No specific information was found regarding their locations in Chicago or New York.

13. Morgan Stanley: No specific information was found regarding their locations in Chicago or New York.

14. Northern Trust: No specific information was found regarding their locations in Chicago or New York.

15. Reyes Holdings: No specific information was found regarding their locations in Chicago or New York.

16. Robert W. Baird & Co: No specific information was found regarding their locations in Chicago or New York.

17. Wexford Capital: No specific information was found regarding their locations in Chicago or New York.

Summary: Among the companies reviewed, Affiliated Managers Group, Alliance Capital Management, BMO Harris Bank, Citicorp, and Goldman Sachs confirmed their offices in both Chicago and New York. If you need further details or have additional queries, feel free to ask!