Bill Ackman engagement report
@BillAckman - 3.0M followers on X
Measured over 48 original posts from a 30-day window, last computed on October 25, 2026.
Engagement
A typical post picks up 2.0K interactions against 3.0M followers, an engagement rate of 0.067%. Measured over 48 original posts, its engagement rate beats 64% of 20,444 tracked accounts of a similar size, which puts it in the middle of its size range rather than at either end. Posts are seen about 232K times each, and 0.874% of those impressions turn into an interaction. That is about 7.66% of the follower count, which is the gap between an audience on paper and an audience in a timeline. Posting runs at about 18.1 posts a day over the last 30 days, with activity on almost every day in the window. Most posts go out around 15:00 UTC, and Sunday is the busiest day of the week. Of the 48 posts sampled, 58% carry an image or video and 33% link out. The account's strongest tracked post pulled 168K interactions, about 83x its own typical post. Recurring topics include #17octobre, #paris, #17oktober.
Measured over 48 original posts from a 30-day window, last computed on October 25, 2026. Recurring tags: #17octobre, #paris, #17oktober.
Compared with accounts its own size
Bill Ackman's engagement rate beats 64% of the tracked X accounts closest to it in follower count (20,444 accounts, accounts of similar size (decile 10 of 10)). A percentile is spread evenly by construction, so 50 really is the middle of that group and 90 really is its top tenth.
On engagement per impression rather than per follower it beats 44% of the same group. When those two numbers disagree, the gap is about how far its posts travel rather than how people react to them.
Where this sits in the catalog
At 0.067%, Bill Ackman sits above the 25th percentile of the 204,694 accounts in this comparison. That places it in the below the median band, which runs 0.024% to 0.143%.
Show the percentile table
| Percentile | Engagement rate |
|---|---|
| 10th percentile | 0.004% |
| 25th percentile | 0.024% |
| 50th percentile | 0.143% |
| 75th percentile | 0.677% |
| 90th percentile | 2.55% |
| 99th percentile | 82.4% |
This ruler is the whole measured catalog, not a size-matched group: it shows where the raw rate falls across every account we can measure, all of which are large. For a like-for-like comparison, read the size-band percentile above instead. See how the bands are built
Posting timing
This account posts most often around 15:00 UTC, and Sunday is its busiest day of the week. The bars below are the catalog-wide pattern, with this account's own busiest slot marked. They do not show how this account performs at each hour: we keep one aggregate per account, not one per hour, so that measurement does not exist in our data.
Show engagement by hour posted, utc as a table
| Hour (UTC) | Vs author median | Posts |
|---|---|---|
| 00:00 UTC | -1% | 89K |
| 01:00 UTC | -2% | 90K |
| 02:00 UTC | -3% | 88K |
| 03:00 UTC | -4% | 94K |
| 04:00 UTC | -5% | 76K |
| 05:00 UTC | -4% | 75K |
| 06:00 UTC | -5% | 86K |
| 07:00 UTC | -5% | 93K |
| 08:00 UTC | -4% | 108K |
| 09:00 UTC | -4% | 124K |
| 10:00 UTC | -3% | 129K |
| 11:00 UTC | -3% | 141K |
| 12:00 UTC | -3% | 154K |
| 13:00 UTC | -3% | 167K |
| 14:00 UTC | -4% | 173K |
| 15:00 UTC | -2% | 176K |
| 16:00 UTC | -3% | 171K |
| 17:00 UTC | -3% | 159K |
| 18:00 UTC | -2% | 149K |
| 19:00 UTC | -2% | 141K |
| 20:00 UTC | -1% | 131K |
| 21:00 UTC | 0% | 116K |
| 22:00 UTC | -2% | 100K |
| 23:00 UTC | -1% | 90K |
Show engagement by day of week as a table
| Day | Vs author median | Posts |
|---|---|---|
| Sunday | +5% | 393K |
| Monday | +1% | 483K |
| Tuesday | -2% | 520K |
| Wednesday | -3% | 472K |
| Thursday | -2% | 430K |
| Friday | -3% | 447K |
| Saturday | +2% | 393K |
Formats this account uses
Its own posting mix on the left, and what each of those formats does across every account we track on the right. Only formats where the effect clears our publish test appear here, so an empty row is a format we could not measure rather than one that does nothing.
| Format | This account | Catalog effect | 95% interval | Accounts behind it |
|---|---|---|---|---|
| Image or video | 58% of posts | +111% | +108% to +115% | 34K |
| Outbound link | 33% of posts | -41% | -42% to -40% | 32K |
| Typical length | - | +15% | +14% to +16% | 32K |
- 58% of this account's sampled posts carry an image or video. Across the catalog, posts with an image or video run 111% above the same accounts' other posts.
- 33% of its posts carry a link off X. Across the catalog, posts with an outbound link run 41% below the same accounts' other posts.
- Its average post runs 955 characters, which falls in the over 280 characters band. Across the catalog, posts over 280 characters run 15% above the same accounts' other posts.
These are catalog-wide differences applied to this account's own posting mix, not a measurement of how each format performs for this account specifically. We keep one median per account, not one per format per account, so the second thing is not something this data can tell you.
Best tweets
- Sep 19, 202683x their median
A mother and her three young children were trapped inside an upside-down SUV that was filling with water in a Florida canal. One of the little boys was banging on the door, screaming that his mom’s head was underwater. That’s when Casey Curtis heard the cries and ran toward the canal. He reached the submerged SUV and started pulling the children out one by one, getting all three to safety. But their mother was still inside. Casey went back to the vehicle and found her unconscious, still buckled into her seat with her head underwater. He lifted her face above the water, realized she wasn’t breathing and gave her a breath right there in the canal. She started breathing again. The mother spent several days in intensive care, but she survived. All three of her children survived too. Those kids watched a stranger pull them from a sinking SUV, then turn around and go back into the water for their mom when she couldn’t save herself. Casey Curtis is the kind of person people should know about.
- Aug 14, 202659x their median
I am in tears. President Trump just walked out to a HUGE Crowd of New York Police Officers chanting: “USA USA USA” with a massive standing ovation Make America SAFE Again https://t.co/Y5IJNEqNzR
- Sep 12, 202656x their median
There's a small window in life when your parents are healthy, your children are little, and everyone is happy and together. It feels like it will last forever, it won’t. Cherish every moment of it.
- Sep 30, 202647x their median
Had this man not found the courage to fight back after being repeatedly attacked with an axe capable of cutting through metal—while bleeding profusely—and had the presence mind to trigger the hijack/emergency code, initiate the emergency response and open the cockpit door to allow passengers to assist him, the aircraft’s subsequent dive could have had catastrophic consequences. Had that aircraft not been recovered, the geopolitical consequences for the Middle East could have been profound and potentially irreversible. Sometimes history turns on the courage, resilience and presence of mind of one person. Yes. One Indian man.
- Sep 5, 202638x their median
A Hero That Trusted His Intuition. The problem wasn’t that Morgan Stanley didn’t believe him. Rick Rescorla had already been right once. After the 1993 basement bombing of the World Trade Center, the firm’s security chief walked the towers, studied the site, and reached a conclusion most people preferred not to hear: the World Trade Center was still a target. Next time, he said, it would not be a truck. It would be an airplane. An airplane. In a 1993 report. Executives listened. Then they looked at the lease. Morgan Stanley was the largest tenant in the complex—twenty-two floors of the South Tower, thousands of brokers, and a trading infrastructure that could not be packed into boxes and wheeled across the Hudson. They literally made it a trading center. The contract with the Port Authority ran until 2006. Walking away from premium Manhattan space of that scale would have meant penalties measured in the hundreds of millions, plus the operational chaos of relocating an entire downtown machine. So the company stayed. Rescorla adjusted. If they could not leave the building, they would learn to escape it. He built a protocol and treated it like doctrine. Unannounced drills. No exemptions. Brokers who billed by the minute were pulled off their desks and sent into the stairwells two by two, starting from the top floors, leaving a lane for firefighters coming the other way. People complained. He did not care. Practice, he believed, was the only thing that would beat panic. On the morning of September 11, 2001, American Airlines Flight 11 hit the North Tower. From the 44th floor of the South Tower, Rescorla could see the fire. Then the Port Authority came over the speakers: the South Tower was secure. Stay at your desks. Rescorla grabbed a bullhorn and ignored them. He started the drill his people already knew by heart. Floor by floor, two by two, down the stairs. He sang as he moved—Cornish songs from childhood, then “God Bless America”—keeping the line moving, refusing to let the stairwell become a stampede. Seventeen minutes later, the second plane struck the South Tower. By then, most of Morgan Stanley was already on the way out. Of the 2,687 employees in the building that morning, all but 13 survived. It was stunning. Rescorla could have been outside with them. He went back up instead. Colleagues told him to leave. He said he would, as soon as he was sure no one was left behind. He was last seen around the 10th floor, heading higher. The South Tower fell at 9:59 a.m. They never found him. He was one of the 13. He was a hero in every sense of the word. Remember Rick Rescorla, he remembered for us.
- Aug 19, 202637x their median
At midnight on February 6th, earlier this year, the doorbell to our apartment rang. The doorbell was followed by a pounding on the door. I answered the door and a security person in our building handed me his phone. It was my oldest daughter Eloise. She had found my 26-year-old daughter unconscious on the floor of her apartment and had called 911. The EMT team was already there, but they did not know what was wrong with Lucy or to which hospital they would take her. I threw on some clothes and jumped in an Uber heading east toward Brooklyn. (Lucy lived alone in Williamsburg.) On the way, I learned that they were taking her to Elmhurst, a City trauma hospital in Queens. I arrived about five minutes after the ambulance to join Eloise, Lucy’s mom, and a friend, and waited to learn what was wrong. After about 15 minutes, I asked a nurse where she was. I looked over his shoulder to his computer. Next to her name, it said “non-responsive.” I walked into the emergency room and wandered around looking for her until I found her unconscious on a gurney surrounded by several doctors and nurses. By about 2:30am with the results from a CAT scan, Lucy’s doctors had determined that she had a massive brain hemorrhage and would need an emergency hemicraniectomy to release the pressure on her brain and remove the blood from the hemorrhage. I called our wonderful friend and family doctor Eddie Fisher and explained what was going on. He woke up Josh Bederson, Chairman of Neurosurgery at Mount Sinai, to find out more about Zach Hickman, the neurosurgeon on call that night. Dr. Bederson said Hickman was an excellent surgeon, which was comforting as we had no choice. The surgery to save Lucy’s life began around 3:15am and finished around 5:30am. It was successful. The following day, I joined Lucy in an ambulance while she was being transferred to Mount Sinai on Madison Avenue. Later that day, we determined from Lucy’s Oura ring that her hemorrhage had occurred around 9am, which meant that more than 19 hours had passed from the time of the hemorrhage to the completion of the surgery to release the pressure on her brain (I only wish @ouraring had an alert for this kind of a medical event. Imagine it could call a family member if the wearer doesn’t cancel the alert). I later learned that the standard of care is not to do surgery to save a patient with a large brain bleed if more than five hours have passed since the hemorrhage. Even when the surgery is done, I was told that the likely outcome for the patient is a few months in a nursing home and death from pneumonia. When I met Lucy’s doctors, I did my best to inspire them: “Let’s see what can be accomplished if we give her the best care possible and we invest unlimited resources to restore her to life.” And I promised that whatever we learned we would make available to everyone. Dr. Chris Kellner, her neurosurgeon, and Dr. David Putrino, Director of Rehabilitation Innovation for the Mount Sinai Health System have led Lucy’s care team since that day. Words cannot describe the remarkable and compassionate care that she has received beginning with the EMT team and then from nurses, doctors, therapists, and the army of people who have worked to save her and return her to life. To this day, we have a daily Zoom where we discuss her progress and make adjustments to her care. While her care and oversight have been incredible, the learnings for the Mount Sinai team have also been elucidating and will assist in the care of many others. Lucy began in a bad place. She was in a coma for several weeks and then awoke not being able to breathe on her own, unable to walk, see or speak. Over the last six months, she has recovered her cognition – she understands everything including her circumstance – is able to walk a hundred or more steps at a time with assistance, is making progress with sounds, vowels and consonants and the beginnings of speech, but she remains unable to see. Each day, she makes a little progress, and daily progress compounds. Every day I tell her that she just needs to make a little progress and it won’t be long before she is back. We remain optimistic that Lucy will return to normal function. It will likely take years, but I believe it is only a matter of time, hard work, and technological progress, along with some, and perhaps a lot, of divine intervention. Many people have been praying for Lucy and we are incredibly grateful for the prayers and remarkable support she has received. Lucy’s friends have been with her every day since the beginning, and their presence and friendship have saved her life and helped to rebuild and maintain her spirit. And on a very positive note, Lucy’s challenge has brought together our entire modern family who have all been incredibly devoted to her care and recovery. Lucy's vision and other faculties may require some form of brain computer interface, work that is underway at Neuralink, Precision Neuroscience, Science, Synchron, Nudge, and other companies in the space. If you are going to have a devastating brain injury, now is the best time in history for that to happen. We are living in a world when you can be confident that the blind will soon see again. We are going to do everything we can to help make that happen, including by assisting existing companies in the space. With respect to our promise to make Lucy’s care available to others, we have made good progress. In May, a real estate colleague made me aware of a 93% vacant, brand new, 400,000 square foot Class A+ purpose-built biotech facility on West End Avenue between 65th and 66th Streets that missed the market and was available for sale. The Pershing Square Foundation acquired the building 60 days later. We also put under contract an adjoining 130,000 square foot building at 320 West 66th Street that is currently being used by Saturday Night Live for studio space. The building has 35-foot ceilings with massive column-free spaces that can be converted into superb rehabilitation facilities. We will close on the SNL building in December. We are also acquiring an adjoining vacant lot with additional air rights. With just the existing zoning rights, we can add a 150,000 square feet for a total of 680,000 square feet, a lab footprint larger than Rockefeller University, and that’s without including the potential for an upzoning that would allow for substantially more buildable area on the site’s 3.4 acres with spectacular views of the Hudson. Our goal is to build the world’s greatest brain research, rehabilitation, recovery, human optimization, and longevity institute. We have named it The Ackman Oxman Institute or the AOI for lack of a better name, but also to reinforce the point that Neri and I and our family are all-in on the mission. The AOI will be patient-centric. It will not be an academic research institute that produces lots of papers, a Nobel Prize winner or two, but little if any results for patients. We will be laser-focused on cures, treatments, devices, rehabilitation and exercise equipment, and targeted and basic research with a goal of massively accelerating the time from idea to innovation to production to helping a patient. While the AOI will be a non-profit, it will have highly commercial instincts. The AOI will have its own venture funding and will work to develop innovations to create companies that we will seed, assist, and spinout to ensure technologies, treatments, techniques, and drugs get to patients as promptly as possible. On one 3.4 acre campus in what is still the greatest city in the world, we will do neurosurgery, neuroscience, rehabilitation, nutrition, BCI and device development, human trials, hyperbaric oxygen treatments, and life extension programs, and we will mandate and incentivize collaboration among the teams with no silos, politics, bureaucracy, or any other constraint that is inconsistent with the mission. Mount Sinai will be an important partner and deservedly so, but it won’t be our only hospital or medical school partner as we don’t believe any institution has a monopoly on the best ideas or the best talent. We don’t believe in exclusive relationships because that is not in the best interest of patients. Five years ago, we considered launching a brain institute inspired by Neri’s mom who sadly died from Alzheimer’s. We couldn’t make the math work as the real estate was too expensive and we believed it would be too difficult to recruit the best talent from universities to our effort. Since then, the real estate became available at a 70% discount, universities became a much less attractive place to work due to politics outweighing meritocracy, protests that disrupt learning, the curse of antisemitism, and a decline in funding. Fortunately, during the same time, I made sufficient personal economic progress to make the AOI possible. The advance of AI in the last few years will also enable us to greatly accelerate our mission. AI still has a lot to learn about human intelligence and the brain, and the AOI should be at the forefront of the interplay between the brain and AI. Today, I am making a public filing disclosing a gift from Neri and me of ~$400 million or 10,000,000 shares of Pershing Square Inc. (PS) to the AOI. It is very early days for Pershing Square so these shares are intended to anchor the long-term work of the AOI as the shares compound over time while generating what we expect will be a growing stream of quarterly dividends to fund the Institute. We will also be announcing an additional gift of similar and potentially greater size which won’t be in the form of Pershing Square stock to provide the AOI with the short- and intermediate-term runway necessary to enable it to achieve its goal of becoming a self-sustaining institute, which reinvests all of its revenues, royalties, and the economic rewards of company formation to advance the fields of brain health and human longevity. Neri and I have chosen to anchor the funding of the AOI to maintain vision alignment and limit the need for the organization to focus on fundraising. We expect the AOI to be the best-resourced brain, rehab, recovery, and longevity institute in the world. We are grateful to have been able to form a board which includes Dean Kamen (our generation’s Thomas Edison), George Yancopoulus (CEO of Regeneron), James Rothman (Nobel Laureate), Bernardo Sabatini (neuroscientist), Chris Kellner (neurosurgeon), Olivia Flatto (CEO Pershing Square Foundation), Neri Oxman, and myself. We have recently identified a CEO who we expect to announce by October along with other key hires, and are beginning searches for a Chief Scientific Officer, a Chief AI/Technology Officer, a Chief Operating Officer, a Chief Financial Officer, and other key leadership roles. If you find what we are building compelling and want to be part of the leadership team that creates and builds the AOI from a standing start, please send an email to: [email protected] with a short note as to why you believe you can help. Please include your best three ideas for the AOI along with a summary of your background and your most important accomplishments. We promise strict confidentiality to those expressing interest in working with us. We have learned from Lucy that the brain can recover from even catastrophic injury. There is so much more work to be done as the mind is a terrible thing to waste. For details from my Pershing Square SEC filing see: https://t.co/gZKafCw6Ia
- Aug 11, 202632x their median
🚨WOW!!! A college student is being praised as a HERO after she saw 3 little girls drowning in Lake Washington, jumped in, and saved ALL THREE GIRLS. The last one was UNCONSCIOUS, underwater, tangled in a rope, only her hair was still floating. All 3 SURVIVED!!!! ❤️ Her name is Lillie Vehling. She is an engineering student at UC Davis and an attacker on the women's water polo team. She was in Seattle for a summer internship and went to Seafair for the very first time, sitting at Genesee Park waiting on the Blue Angels with a book in her hands. Then she scanned the water. Three girls were out past the buoy line, bobbing, screaming, going under. She is a certified lifeguard who started her own swim lesson program, so she knew exactly what she was looking at. One of the girls was pushing the other two under just to get a breath. That is when she went in. She grabbed that girl first, to stop her from taking the other two down with her. Got her to shallow water. Went back for the second one. Then she went back a third time. By then the third girl was already gone under. Lillie: "I just saw her black hair in the water barely floating." The child was unconscious AND tangled in the rope of a buoy she had been clawing at to save her own life. Lillie got an arm under her, lifted her head out of the water, and hauled her to shore. The little girl coughed up the lake and came back. Seattle Fire paramedics met them on the beach. One girl went to Seattle Children's Hospital in stable condition. All three lived. Seafair's president found her that same day. Her first question was whether Lillie was okay. Her second was whether she could give her a hug. That night they brought her to the gala and knighted her "Lady Guardian of Lake Washington." Admirals lined up to meet her. And Lillie? She is chasing a career in the nuclear Navy. Seafair's president says she hopes the next time Lillie comes back to that lake, it is in a Blue Angels cockpit. "To save three people, I didn't think twice about myself." GOD BLESS Lillie Vehling, and GOD BLESS the firefighter who raised her. THIS IS THE AMERICA I KNOW!!! 🇺🇸🇺🇸🇺🇸
- Aug 16, 202632x their median
If you had trusted the settled science of the day, here is how it would have gone. 1890s: you dose the baby with Bayer's new cough syrup, the non-addictive alternative to morphine, marketed for children. It was heroin. They named it after the German for heroic. 1900s: you rub calomel teething powder on your infant's gums. It is a mercury compound, and it leaves a generation with pink disease. Swollen, peeling hands and feet, screaming for months, and some of them died. 1910s: you cook in Crisco, launched by a soap and candle company, because cottonseed oil is modern and lard is what your mother used. The process that made it solid produced trans fat, banned outright a century later. 1920s: you drink Radithor, certified radioactive water, on prescription. Eben Byers took fourteen hundred bottles for his vitality. His jaw was removed in pieces and he was buried in a lead coffin. 1930s: a chemist dissolves a new sulfa drug in diethylene glycol, which is antifreeze. It kills 107 people, mostly children, and only then does America give the FDA power to demand safety testing. 1940s: your doctor lights a Camel in the surgery. More doctors smoke them than any other brand, and the advert runs in the Journal of the American Medical Association, which sold him the page. 1950s: DDT is sprayed over your kitchen, your garden and your children at school. The man who found its insecticidal properties has already been given a Nobel Prize. 1960s: your wife takes thalidomide for morning sickness because it is remarkably safe. More than ten thousand children are born with missing and shortened limbs. 1970s: the country puts down the butter and picks up the margarine, on the instruction of the American Heart Association. The fat everybody switched to was banned in 2015 as unsafe at any level. 1980s: the fat comes out of everything and sugar goes back in to make it edible. Obesity begins a climb it has never come off. 1990s: your father is prescribed OxyContin, because fewer than one per cent get addicted. The company later pleads guilty to criminal misbranding, and the overdose count runs into hundreds of thousands. 2000s: you take Vioxx for your knee. It is pulled in 2004, and the FDA's own safety officer estimates tens of thousands of excess heart attacks. Not one of those was fringe. Every one had a professional body, a literature and a man in a white coat standing behind it. Nobody who followed that advice was stupid. They were obedient, to the most qualified people available. Settled is a word about money. It means the questions stopped being funded, so they stopped being asked. So which of today's instructions will your grandchildren read out in disbelief. The oil washed in hexane and built into every cell you own. The statin that blocks the pathway making your hormones, to prevent one heart attack per hundred people. The injection where a third of the loss is muscle. The infant formula built out of vegetable oil. All settled. None of it funded to be otherwise.
- Sep 24, 202628x their median
An anti-AI protest outside Google’s offices today. Note the presence of a Palestinian flag. Can someone please explain the alignment between the Palestinian and anti-AI protestors? https://t.co/cp8OrulU3y
- Sep 6, 202621x their median
Let's fix 3 major brands. Which is your favorite fix? Disney+, 47 Brand or Kind? Which major logo should I fix next? https://t.co/F5CRc7sSfM
Ranked by total interactions across everything we have tracked for this account, which is a longer history than the 30-day window the rates above use. The multiple compares each post to this account's own median.
Recurring topics
The most frequent hashtags in the sampled posts. They describe what this account writes about; they are not a performance signal, and the catalog-wide breakdown on the hub shows how little hashtag count moves.
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Reading these numbers
A typical post picks up 2.0K interactions against 3.0M followers, an engagement rate of 0.067%. Measured over 48 original posts, its engagement rate beats 64% of 20,444 tracked accounts of a similar size, which puts it in the middle of its size range rather than at either end. Posts are seen about 232K times each, and 0.874% of those impressions turn into an interaction. That is about 7.66% of the follower count, which is the gap between an audience on paper and an audience in a timeline. Posting runs at about 18.1 posts a day over the last 30 days, with activity on almost every day in the window. Most posts go out around 15:00 UTC, and Sunday is the busiest day of the week. Of the 48 posts sampled, 58% carry an image or video and 33% link out. The account's strongest tracked post pulled 168K interactions, about 83x its own typical post. Recurring topics include #17octobre, #paris, #17oktober.
- What is Bill Ackman's engagement rate on X?
- Bill Ackman (@BillAckman) has an engagement rate of 0.067%, based on the median interactions across 48 original posts from the last 30 days against 3,036,068 followers. Replies, reposts and quote-posts of other people are excluded from that sample.
- Is that a good engagement rate?
- At 0.067%, Bill Ackman sits above the 25th percentile of the 204,694 accounts in this comparison. Those comparison accounts are all large ones, because our scanning cadence is weighted towards big accounts, so this is a ranking among peers of similar scale rather than a ranking across X.
- Does @BillAckman have real engagement?
- Its engagement rate beats 64% of the tracked X accounts closest to it in follower count (20,444 accounts), which puts it in the middle of its size range group. Ranking inside a size band matters because engagement rate falls as accounts grow, so a raw rate would mostly re-measure the follower count. It is a starting point for a look at follower quality, not a verdict on it.
- When does @BillAckman post?
- Most posts go out around 15:00 UTC, and Sunday is its busiest day, at roughly 18.07 posts per day across the measured window.