Following money for @WSJ using words, numbers and code. Co-founder: @jourmentors. Tips: github.com/ceostroff/contact. ∑: @TheAlligator, @MiamiHerald
Joined February 2015
- Tweets 3,819
- Following 2,958
- Followers 9,934
- Likes 23,238
415 Photos and videos
Caitlin Ostroff retweeted
Jun 2
Insurers warn of fraud and exorbitant charges from providers, including one that stuck a parent with a surprise $911,400 bill. on.wsj.com/4ehfaNB
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Caitlin Ostroff retweeted
Looking to trade on Polymarket? Here's the fine print: if your bet gets disputed (eg, because it's unclear if an agreement is a "ceasefire") the decision is up to anonymous holders of UMA, a digital token, who may have conflicts of interest. With @skesslr wsj.com/finance/polymarket-b…
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Caitlin Ostroff retweeted
May 18
When a @Polymarket result is disputed, it goes to a decentralized panel of judges.
But the system is rife with conflicts: ~60% of judges were linked to Polymarket accounts, and in nearly 20% of disputes we found judges tied to bets on the very markets they were deciding.
w/ @aosipovich
wsj.com/finance/polymarket-b…
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Caitlin Ostroff retweeted
May 11
"In one meeting, Trump passed a stack of news articles he and other senior officials thought threatened national security to Blanche with a sticky note on it that said 'treason,' another administration official said." wsj.com/politics/national-se…
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Caitlin Ostroff retweeted
May 4
Who wins on prediction markets? High-frequency traders.
We examined 1.6 million Polymarket wallets and found that the top 0.1% highest-frequency traders are by far the most likely to turn a profit.
One of those traders is Jonathan Stall-Ryan (pictured), whose firm of around a dozen college students turned $1,000 into seven figures. They're one of the top crypto traders on Kalshi and make tens of thousands of trades a day.
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Caitlin Ostroff retweeted
Mar 15
Join our team and write about the people and forces shaping markets. Huge bets on AI. Macro trades affecting nations. Succession dramas. Individual investors making exotic wagers. Requires first-class reporting and the writing to do it justice. dowjones.jobs/new-york-ny/re…
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The U.S. government says its agents are under attack. Most of the alleged culprits in the tweets were U.S. citizens.
From my @WSJ colleagues @noslouch, @brenna__smith, @HannaCritch, @bellecushing and @emmatscott
wsj.com/us-news/immigration-…
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My friend wrote a book and you should buy it 📚
Sorry. Phone died. What did I miss? In the meantime, I wrote a book
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Caitlin Ostroff retweeted
Sorry. Phone died. What did I miss? In the meantime, I wrote a book
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Caitlin Ostroff retweeted
Mar 6
NEW: A fraternity that counts Jeff Bezos' stepson as a member under investigation for insider trading. Polymarket-branded beer pong sets. $20,000 in funding to open a prediction market club.
Here's how prediction markets are gaining ground on campus.
wsj.com/business/media/predi…
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Caitlin Ostroff retweeted
“We know this shouldn’t be allowed,” said one brother involved. “People are like, is this insider information? Is this regulated? You feel like you’re doing something you’re not supposed to. It feels like someone should stop you.”
Must-read: wsj.com/business/media/predi…
Mar 6
NEW: A fraternity that counts Jeff Bezos' stepson as a member under investigation for insider trading. Polymarket-branded beer pong sets. $20,000 in funding to open a prediction market club.
Here's how prediction markets are gaining ground on campus.
wsj.com/business/media/predi…
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ICYMI: My latest with @sgurman
Mar 4
The Justice Department has withheld thousands of documents from the Epstein files, including FBI documents that detailed a woman’s unverified allegations of sexual misconduct against President Trump, according to a review by WSJ. on.wsj.com/4sichQP
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Caitlin Ostroff retweeted
Did Polymarket finally go too far? It's just removed a betting market on nuclear detonation, amid intense debates over the ethics of war betting and the risks of insider trading on military strikes. From @ceostroff wsj.com/livecoverage/stock-m…
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My latest with the great @sgurman
New: After a @WSJ analysis identified more than 40,000 files that appeared to be missing from the DOJ’s website, a DOJ spokeswoman said that “47,635 files were offline for further review and should be ready for re-production by the end of the week.”
wsj.com/us-news/law/there-ar…
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New: After a @WSJ analysis identified more than 40,000 files that appeared to be missing from the DOJ’s website, a DOJ spokeswoman said that “47,635 files were offline for further review and should be ready for re-production by the end of the week.”
wsj.com/us-news/law/there-ar…
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Caitlin Ostroff retweeted
Kalshi has posted its first disciplinary actions, against a former longshot candidate the California governor and a MrBeast employee. My colleague @kryshur reports on the brave new world of prediction-market enforcement actions wsj.com/business/media/kalsh…
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Caitlin Ostroff retweeted
It's one of the wackiest corners of prediction markets: "mentions", where traders bet on phrases that politicians and celebrities say at upcoming events. Will the words "insider trading" and "manipulation" appear in this story? With @ceostroff @ByKLong wsj.com/finance/investing/wh…
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Feb 19
On May 3, 2016, Epstein sent an email to Kathy Ruemmler. He wrote that Jean-Luc Brunel was planning to go to prosecutors the following week and one of Brunel’s friends had “asked for 3 million dollars so that Jean Luc would not go in.”
w/@khadeeja_safdar
wsj.com/us-news/epstein-acco…
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Caitlin Ostroff retweeted
Feb 19
New via WSJ: French modeling scout Jean-Luc Brunel was secretly negotiating in 2016 with lawyers representing Epstein's victims, according to DOJ files.
Brunel's lawyer told them his client recruited girls for Epstein and had incriminating photographs.
Then Brunel went dark. wsj.com/us-news/epstein-acco…
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Caitlin Ostroff retweeted
NEW: In 2016, Jean-Luc Brunel was discussing a date to walk into the U.S. Attorney’s office in New York to provide evidence against Jeffrey Epstein—in exchange for immunity. On May 3, Epstein fired off an email to Kathy Ruemmler. He wrote that Brunel was planning to go to prosecutors the following week and one of Brunel’s friends had “asked for 3 million dollars so that Jean Luc would not go in.”
Story w/ @ceostroff wsj.com/us-news/epstein-acco…
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