ACR Poker’s Online Super Series (OSS) returns May 11 to May 25, 2026 with more than $20 million in guaranteed prize pools across 171 tournaments. Buy-ins range from $5.50 to $2,650.
Three Main Events headline the schedule: a $1.5M GTD at $2,650, a $1.5M GTD at $1,050, and a $1M GTD at $215. All three share the same two-flight structure with Day 2 on Monday, May 25.
The series follows March’s $50M OSS XL series on ACR, which cleared its guarantee at $51.5M in total prize pools. This May edition is the standard-size OSS: a tighter 15-day run built around two big Sundays and a stacked closing Monday.
Three Main Events and a $250K Bonus
The three flagship Main Events use a multi-day format. Day 1A fires on Sunday, May 17 and Day 1B on Sunday, May 24, both at 11:05 AM ET. Day 2 for all three runs Monday, May 25 at 1:30 PM ET.
Starting stacks are deep: 350,000 chips for the $2,650 and $1,050 events, 300,000 chips for the $215. Late registration stays open through Level 32, and players who bust on Day 1A can re-enter on Day 1B.
| Event | Buy-in | GTD | Day 2 |
|---|---|---|---|
| OSS #1 Main Event | $2,650 | $1,500,000 | Mon May 25, 1:30 PM ET |
| OSS #2 Main Event | $1,050 | $1,500,000 | Mon May 25, 1:30 PM ET |
| OSS #3 Main Event | $215 | $1,000,000 | Mon May 25, 1:30 PM ET |
| OSS #4 Additional ME | $66 | $250,000 | Single-day (Sun May 24) |
A fourth option sits below the big three. The $250,000 GTD Additional Main Event at just $66 runs as a single-day tournament on Sunday, May 24. It is the cheapest path to a Main Event title in the entire series.
$1M Multi-Flight and Mystery Bounty Events
Beyond the Main Events, four multi-flight tournaments add another $1.975 million in guarantees to the schedule.
The biggest is OSS #5, a $1,000,000 GTD at $630 with Day 1 flights running the full length of the series. Three Mystery Bounty multi-flights round out the lineup, and their Day 1 flights have been running since April 26.
- OSS #5 ($1,000,000 GTD, $630 buy-in): Day 1 flights run May 11 through May 25. Day 2 on Monday, May 25 at 2:05 PM ET.
- OSS #6 Mystery Bounty ($750,000 GTD, $109 buy-in): Day 1 flights running since April 26. Day 2 on Monday, May 25 at 3:05 PM ET.
- OSS #7 Mystery Bounty Squeeze ($150,000 GTD, $33 buy-in): Day 1 flights running since April 26. Day 2 on Sunday, May 24 at 4:05 PM ET.
- OSS #8 Mystery Bounty Dime ($75,000 GTD, $5.50 buy-in): Day 1 flights running since April 26. Day 2 on Sunday, May 24 at 2:05 PM ET.
The $5.50 Mystery Bounty Dime is worth flagging for micro-stakes grinders. A $75,000 guarantee at that buy-in means significant overlay potential, and the multi-flight structure lets you take multiple shots across nearly a month of Day 1 entries.
Full Schedule Breakdown
The 171-event schedule runs Sunday through Thursday only. Fridays and Saturdays are dark: no OSS events on May 15-16 or May 22-23. ACR uses the same calendar design it ran for the March OSS XL, concentrating volume on the days when its player pool is most active.
Sunday, May 17 features 41 events including a $600,000 GTD at $630 and the Day 1A flights for all three Main Events. Sunday, May 24 is the biggest single day at 45 events with the Day 1B flights, the $250K Additional Main Event, and Day 2s for the smaller Mystery Bounty multi-flights.
The closing day, Monday, May 25, stacks the three Main Event Day 2s alongside standalone headliners: a $400,000 GTD at $2,650 and a $500,000 GTD at $1,050.
Formats go beyond standard NLH freezeouts. The schedule includes Progressive Knockout (PKO) events at every buy-in tier, Mystery Bounty tournaments, Pot-Limit Omaha, 5-Card PLO/Hi-Lo, 6-Max, and Hyper-turbo late-night closers most weeknights at 8:15 PM ET.
$30,500 Leaderboard Competition
ACR is funding a $30,500 leaderboard that runs the full length of the series from May 11 to May 25. It splits into two tiers based on buy-in level.
| Tier | 1st | 2nd | 3rd | 4th | 5th |
|---|---|---|---|---|---|
| High ($33+ buy-ins) | $10,000 | $5,000 | $3,000 | $2,000 | $1,500 |
| Low (under $33) | $4,000 | $2,000 | $1,500 | $1,000 | $500 |
Points are awarded to in-the-money finishers in OSS-tagged events only. The formula uses the square root of the prize pool divided by the square root of your finishing position. Playing more events at higher buy-ins generates more points, but consistent deep runs in the low tier can pay off at $4,000 for first.
Lock in rakeback before the series starts. Players who sign up for ACR through our ACR Poker review and rakeback deal get the best available rate on the Winning Poker Network. That compounds across 171 events, and going direct means leaving money on the table.
How to Get In
Satellites for the Main Events and headliner tournaments run inside the ACR tournament lobby throughout the series. Step satellite paths start from micro buy-ins and feed into the $2,650, $1,050, $630, and $215 events.
ACR’s cash-game leaderboard, The Beast, also awards tournament tickets usable for OSS events. Survivor Flips and Spin to Get IN offer additional qualification paths at no direct cost.
New players can start with a 100% match bonus up to $2,000 on their first deposit. Check our ACR Poker bonus code page for the latest sign-up offer before creating an account.
The Mystery Bounty multi-flight Day 1s have been running since April 26. That means entry windows for the $750K, $150K, and $75K Mystery Bounty events are open right now, weeks before the series officially starts on May 11.
The full schedule with start times and structures is available in the ACR tournament lobby once you log in. First events fire Sunday, May 11. Main Event Day 1A follows on Sunday, May 17.
For ongoing coverage, check our poker news hub.
