| Date | Exchange | Short code | Holiday description |
|---|
| | |
| 2012 May. 21 | Toronto Stock Exchange | TSE | Victoria Day |
| 2012 May. 28 | American Stock Exchange | AMEX | Memorial Day |
| 2012 May. 28 | Budapest Stock Exchange | BUD | Whitmonday |
| 2012 May. 28 | OMX Copenhagen | CSE | Whitmonday |
| 2012 May. 28 | NASDAQ Global Markets | NASDAQ NM | Memorial Day |
| 2012 May. 28 | NASDAQ Capital Market | NASDAQ SC | Memorial Day |
| 2012 May. 28 | New York Stock Exchange | NYSE | Memorial Day |
| 2012 May. 28 | NYSE ARCA | NYSE_ARCA | Memorial Day |
| 2012 May. 28 | Other OTC on NASDAQ (Pink Sheets) | OOTC | Memorial Day |
| 2012 May. 28 | Oslo Stock Exchange | OSE | Whitmonday |
| 2012 May. 28 | OTC Bulletin Board on NASDAQ | OTCBB | Memorial Day |
| 2012 May. 28 | Swiss Exchange | SWX | Whitmonday |
| 2012 May. 28 | Wiener Börse (Vienna) Stock Exchange | VIE | Whitmonday |
| 2012 May. 28 | SWX Europe | VX | Whitmonday |
| 2012 Jun. 04 | Athens Stock Exchange | AT | Whitmonday (Orthodox) |
| 2012 Jun. 04 | London Stock Exchange | LSE | Spring Holiday |
| 2012 Jun. 04 | London International Exchange | LSE_INTL | Early Close 00:00 |
| 2012 Jun. 04 | London Stock Exchange SEAQ Market | LSE_SEAQ | Spring Holiday |
| 2012 Jun. 04 | London Stock Exchange SETS Market | LSE_SETS | Spring Holiday |
| 2012 Jun. 05 | OMX Copenhagen | CSE | Constitution Day |
| 2012 Jun. 05 | London Stock Exchange | LSE | Queen's Diamond Jubilee |
| 2012 Jun. 05 | London International Exchange | LSE_INTL | Early Close 00:00 |
| 2012 Jun. 05 | London Stock Exchange SEAQ Market | LSE_SEAQ | Queen's Diamond Jubilee |
| 2012 Jun. 05 | London Stock Exchange SETS Market | LSE_SETS | Queen's Diamond Jubilee |
| 2012 Jun. 06 | OMX Stockholm | SSE | National Day |
| 2012 Jun. 07 | Wiener Börse (Vienna) Stock Exchange | VIE | Corpus Christi |
| 2012 Jun. 07 | Warsaw Stock Exchange | WSE | Corpus Christi |
| 2012 Jun. 11 | Australian Stock Exchange Ltd. | ASX | Queen's Birthday |
| 2012 Jun. 22 | OMX Helsinki | HSE | Midsummer Eve OBS |
| 2012 Jun. 22 | OMX Stockholm | SSE | Midsummer Eve OBS |
| 2012 Jul. 02 | Hong Kong Stock Exchange | HKEX | SAR Establishment Day OBS |
| 2012 Jul. 02 | Toronto Stock Exchange | TSE | Canada Day OBS |
| 2012 Jul. 04 | American Stock Exchange | AMEX | Independence Day |
| 2012 Jul. 04 | NASDAQ Global Markets | NASDAQ NM | Independence Day |
| 2012 Jul. 04 | NASDAQ Capital Market | NASDAQ SC | Independence Day |
| 2012 Jul. 04 | New York Stock Exchange | NYSE | Independence Day |
| 2012 Jul. 04 | NYSE ARCA | NYSE_ARCA | Independence Day |
| 2012 Jul. 04 | Other OTC on NASDAQ (Pink Sheets) | OOTC | Independence Day |
| 2012 Jul. 04 | OTC Bulletin Board on NASDAQ | OTCBB | Independence Day |
| 2012 Jul. 05 | Prague Stock Exchange | PRA | Cyril and Methodius |
| 2012 Jul. 06 | Prague Stock Exchange | PRA | Burning at Stake of Jan Hus |
| 2012 Jul. 16 | Tokyo Stock Exchange | TYO | Marine Day |
| 2012 Aug. 01 | Swiss Exchange | SWX | National Day |
| 2012 Aug. 01 | SWX Europe | VX | National Day |
| 2012 Aug. 06 | Australian Stock Exchange Ltd. | ASX | Bank Holiday/Normal trading |
| 2012 Aug. 06 | Toronto Stock Exchange | TSE | Civic Holiday |
| 2012 Aug. 09 | Johannesburg Stock Exchange | JSE | National Women's Day |
| 2012 Aug. 09 | Singapore Exchange Securities Trading Limited | SGX-ST | National Day |
| 2012 Aug. 15 | Athens Stock Exchange | AT | Assumption Day |
| 2012 Aug. 15 | Borsa Italiana – Blue Chip, Star & MTA Int. | MIL | Assumption Day |
| 2012 Aug. 15 | Wiener Börse (Vienna) Stock Exchange | VIE | Assumption Day |
| 2012 Aug. 15 | Warsaw Stock Exchange | WSE | Assumption Day |