In September, we acquired the other 50% interest in CityCenter, monetizing its underlying real estate and are now proud owners of 100% of its operations.
I spent the early part of my career at Mirage, I've been a part of that team's opening of the property in 1989.
The campus also sits on approximately 77 acres that provides attractive development opportunities to capture large amounts of foot traffic.
And within a short nine-day period, BetMGM is now live in 16 markets and is well on its way to 20 by the end of the first quarter of 2022.
In the three months ending August, BetMGM commanded 23% share nationwide in both U.S. sports and betting and iGaming.
And in the month of August, we believe BetMGM was competing for first place driven by iGaming in which BetMGM remains the clear leader with a 32% market share.
BetMGM continued momentum through this year has been extraordinary, and we expect full year 2021 net revenues associated with BetMGM will be in excess of $800 million.
The Raiders estimate that roughly 60% of tickets are sold to out-of-state fans.
And with the majority of the 50,000 to 60,000 people walking to and from Allegiant Stadium over the Hacienda Bridge between Mandalay Bay and Luxor, we are seeing significant broad-based uplift at both properties on event days and even more so on Raiders games.
And now with only 60 days until the start of 2022, I could not be more excited about our prospects for the year ahead, and it's all due to the heroic efforts of our thousands of colleagues here at MGM Resorts.
Our consolidated third quarter net revenues were $2.7 billion, a 19% sequential improvement over our second quarter results.
Our net income attributable to MGM Resorts was $1.4 billion driven by a $1.6 billion net gain from the consolidation of CityCenter.
Our third quarter adjusted EBITDAR improved sequentially to $765 million, led once again by our domestic operations.
12 of our 18 domestic properties achieved either all-time or third quarter EBITDAR records, and 15 achieved either all-time or third quarter margin records.
Our Las Vegas Strip net revenues were $1.4 billion, just 8% below the third quarter of 2019.
Adjusted property EBITDAR for the Strip was $535 million, 21% above the third quarter of 2019.
Hold had a $20 million positive impact on our EBITDAR this quarter.
So Hold Adjusted Strip EBITDAR was approximately $514 million.
Our Strip margins were 39% in the third quarter, a 943 basis point improvement over the third quarter of 2019 and a slight decline on a sequential basis over the second quarter of 2021.
Third quarter Strip casino room nights were 27% greater than in the third quarter of 2019.
Casino revenues per casino room night was up 10% above the third quarter of 2019.
All of this translated into third quarter casino revenues increasing to 26% above the third quarter of 2019, contributing 31% of our total Strip revenues in the third quarter, and that compares to our casino revenue mix of 22% back in 2019.
Our Strip hotel occupancy was 82% in the third quarter, improving from 77% in the second quarter.
And for the first time since reopening, the third quarter's room rates ran higher than pre-pandemic levels, with ADR 10% above that of the third quarter of 2019 or 5% when we exclude Circus Circus.
We finished a strong October with occupancy of 92%, the highest since reopening, and we expect November and December to be strong but also to follow seasonal slowdowns as we typically do every year heading into the holidays.
Led by Anton Nikodemus and his team, the CityCenter joint venture reported quarter to date ended September 26, adjusted EBITDA of approximately $120 million, with 40% margins.
Had CityCenter been consolidated for the full quarter, our Las Vegas Strip EBITDAR would have been approximately 22% higher than what we reported in the third quarter.
Our third quarter regional net revenues were $925 million, just 1% below that of the third quarter in 2019.
We delivered adjusted property EBITDAR of $348 million, which was 29% above 2019 levels and 9% above what we achieved in the second quarter of 2021.
Our regional casino business further strengthened in the third quarter with our slots and table games volumes improving sequentially by 6% and 11%, respectively, from the second quarter this year.
Our third quarter regional margins of 38% were another all-time record growing 886 basis points over the third quarter of 2019.
Our 50% share of BetMGM's losses in the third quarter amounted to $49 million, which is reported as a part of the unconsolidated affiliates line of our adjusted EBITDAR calculation.
Net revenues associated with BetMGM operations were $227 million in the quarter, exhibiting a 17% sequential growth from the second quarter, led by the continued strength in iGaming.
In the third quarter, 16% of BetMGM's new players were attributed to MGM, meaning they were active with MGM in the last 12 months.
In the third quarter, 42% of our new M life sign-ups have come from BetMGM, which plays a crucial role in our database expansion, a database, which currently stands at over 37 million members.
Finally, in Macau, third quarter marketwide gross gaming revenues sequentially declined 26% from the second quarter and was 27% of the third quarter 2019.
MGM China's third quarter results were also sequentially lower from the second quarter with net revenues of $289 million and adjusted property EBITDAR of $7 million.
Hold adjusted EBITDAR was a $2 million loss.
And with quarantine-free travel having resumed on October 19, the market has seen daily visitation rebound from less than 1,000 in the first 18 days to over 26,000 for the remainder of the month.
Our third quarter corporate expense, excluding share-based compensation, was $105 million, which included approximately $18 million of transaction costs for both MGM and MGP.
In the third quarter, we repurchased 17.2 million shares for $687 million, and we purchased an additional 1.8 million shares for $80 million in the fourth quarter through today.
That's $1.1 billion of share repurchases year to date, or approximately 5% of our market cap, and that is this year since March.
In October, we closed the MGM Springfield transaction for cash proceeds of $400 million.
Our transaction with VICI is on track to close in the first half of next year, subject to regulatory approval, at which point we will bring in an additional $4.4 billion in proceeds.
In September, we announced an agreement to acquire the operations of The Cosmopolitan of Las Vegas for $1.625 billion.
As of September 30, our liquidity position, excluding MGM China and MGP, was $6.4 billion, or $9.6 billion when adjusted for the Springfield, VICI and The Cosmopolitan transactions.

Summary:
Our consolidated third quarter net revenues were $2.7 billion, a 19% sequential improvement over our second quarter results.
MGM China's third quarter results were also sequentially lower from the second quarter with net revenues of $289 million and adjusted property EBITDAR of $7 million.