From MusicBrainz Wiki

This is a research page for the Concertmaster AR.

(1st) Concertmaster / Leader

Position Example Comment
Concertmaster Andreas Buschatz, Berliner Philharmoniker
1st Concertmaster Guy Braunstein, Berliner Philharmoniker One of 3 first CMs
Principal Concertmaster Tobias Steymans, Symphonieorchester des Bayerischen Rundfunks Webpage translates "1. Konzertmeister" with "Principal CM".
1st Principal Concertmaster unverifed
Alternating Concertmaster unverifed My translation?
Leader Gordan Nikolitch, London Symphony Orchestra
1st leader Erkki Palola, Helsinki Philharmonic Orchestra

Associate Concertmaster

Position Example Comment
Associate Concertmaster Nancy Wu, The Metropolitan Opera Orchestra
Associate Concertmaster Georg Liener, BR Münchner Rundfunk Orchester "Stellvertretender Konzertmeister" in German. English page even uses the term "deputy CM"!
Associate Concertmaster GSO Alt. förste k. in Swedish; literally "alternating first CM"
Principal Associate Concertmaster Laura Hamilton, The Metropolitan Opera Orchestra
Associate Concertmaster Boston Symphony Orchestra Both Associate & Assistant CM in the same orchestra.

So Associate CM != Assistant CM, but I haven't found a good explanation of the differences yet. Actually it looks like Associate CM > Assistant CM.

2nd Concertmaster, Assistant Concermaster

Position Example Comment
Assisting Concertmaster Lyndon Johnston Taylor, New Zealand Symphony Orchestra
Assistant Concertmaster Jeremy Constant, San Fransisco Symphony
Assistant Concertmaster Nicola Birkhan, Symphonieorchester des Bayerischen Rundfunks German: Vorspielerin
1st Assistant Concertmaster Tjeerd Top, Concertgebouw Orchestra "assistant principal violinist" according to the official homepage.
2nd Assistant Concertmaster Simon James, Seattle Symphony
Co-Concertmaster Pam Dassenko, San Luis Obispo Symphony
2nd Deputy Leader GSO Andre konsertmästare = literally 2nd CM
3nd Concertmaster Ingrid Sjönnemo, Gothenburg Symphony Orchestra
Guest Concertmaster ?
1st Guest Concertmaster Alexander Kerr, Indianapolis Symphony Orchestra
Concertmaster Emeritus ?
2nd leader Eriikka Maalismaa, Helsinki Philharmonic Orchestra
Assistant Leader Tomo Keller, London Symphony Orchestra
Co-Leader Carmine Lauri, London Symphony Orchestra
Sub-Leader Lennox Mackenzie, London Symphony Orchestra

Not sure what to do with "acting"; acting first assistant concermaster etc.