Photograph by Adele Erolsky.
The technique
A syndicate is simply a group who pool money to buy more tickets than any one person would alone, then split whatever they win by however much each person chipped in. Workplaces, families, and friend groups have run informal syndicates for as long as lotteries have existed.
What its fans say
The pitch is straightforward and, unlike most on this site, basically true: ten people buying ten different tickets between them really do hold ten times the combinations of one person buying one ticket. More combinations covered means a genuinely higher chance that the group holds a winning line on any given draw.
What the maths says
Here's the catch that the pitch quietly leaves out: your odds of winning go up, but your expected value per dollar doesn't move a cent. Ten people spending $1 each for a 10-in-300-million shot at a jackpot they'll split ten ways is mathematically identical to one person spending $10 on a 10-in-300-million shot at the full prize divided by ten. Nothing about the arithmetic changes. You've just traded a very rare shot at a very large prize for a slightly-less-rare shot at a proportionally smaller one. That's not a criticism of syndicates. It's just what they actually are: a volatility swap, not an edge.
The genuinely interesting twist
Almost every syndicate anyone will ever join is the "friends pooling tickets" kind above, no edge, just shared cost and shared risk. But there's a real, well-documented historical exception, and it's a genuinely wild story. Romanian-Australian mathematician Stefan Mandel worked out that when a jackpot rolls over enough times, it can grow larger than the total cost of buying literally every possible number combination, at which point buying the entire number space stops being a gamble and becomes a guaranteed profit. He organised investor syndicates to do exactly that, most famously buying out a 1992 Virginia lottery for a jackpot larger than the cost of covering every combination, and won.
It worked precisely because it required three things that essentially don't exist anymore: a small enough number pool that full coverage was physically printable, no rule against bulk-buying, and a retail system that could process an enormous stack of tickets in time. Every one of those loopholes has since been closed by lottery operators specifically because of what Mandel did. It's a genuinely fascinating piece of lottery history, and also a permanently closed door.
My take
I have a soft spot for the Mandel story precisely because it's the one time on this site the maths actually worked in the player's favour. It's the exception that proves how airtight the rest of the rule is. For everyone else, a normal syndicate is exactly what it says on the tin: a way to trade a lottery-sized dream for a smaller, more frequent one, split among people you already like. That's a perfectly good reason to run one. Just don't join thinking you've found an edge, because the maths says otherwise, and now you know exactly why.
Verdict
As a way to change your expected value: no, and it never will, for any normal-sized group. As a way to spread cost, spread risk, and turn draw night into something shared: genuinely good reasons, and worth doing for those alone. As history: Stefan Mandel is one of the most interesting true stories in the entire lottery world, and worth reading about regardless of whether you ever join a syndicate yourself.
No pooling arrangement changes the odds of a random draw for the money involved. This is opinion and entertainment, not advice. See the real odds before deciding if a syndicate is for you.
References
1. LottoROI, "Lottery Syndicates Explained: Stefan Mandel, Office Pools, and the Math of Group Play" (full Mandel history and the syndicate expected-value maths): lottoroi.com
2. Bland, R. et al., "A Method for Winning at Lotteries": the formal mathematics of coordinated syndicate betting against a crowd of independent players: arxiv.org
3. Clotfelter, C.T. & Cook, P.J. (1993), "The 'Gambler's Fallacy' in Lottery Play," Management Science 39(12): scholars.duke.edu