• Home
  • Latest
  • Fortune 500
  • Finance
  • Tech
  • Leadership
  • Lifestyle
  • Rankings
  • Multimedia
FinanceBill Ackman

Did Bill Ackman just kill the poison pill?

By
Stephen Gandel
Stephen Gandel
Down Arrow Button Icon
By
Stephen Gandel
Stephen Gandel
Down Arrow Button Icon
November 6, 2014, 4:10 PM ET
Bill Ackman, founder and CEO of Pershing Square.
Bill Ackman, founder and CEO of Pershing Square.Photograph by Jin Lee — Bloomberg via Getty Images

You might be able to add the so-called poison pill to the list of Bill Ackman’s conquests this year.

On Tuesday, a judge in California ruled that Ackman is allowed to vote his shares at a key meeting next month in the long-running takeover battle for botox maker Allergan. Ackman favors a bid by rival pharmaceuticals company Valeant, which Ackman has teamed up with to acquire Allergan. Poison pills are supposed to stop investors from doing this sort of thing (i.e. ganging up with other investors or with other companies to do hostile take overs). Allergan has a poison pill in place, and has been fighting to stave off Valeant’s takeover bid. And the judge’s ruling means that Ackman and Valeant can continue to team up. It also means that Ackman, who will vote to have most of Allergan’s board removed, and Valeant are one step closer to taking over Allergan.

Allergan may still thwart this effort. The company is reportedly in talks to be acquired by another pharmaceutical company, Activas.

Still, the ruling seems like a pretty big victory, not just for Ackman and Valeant, but for all activist hedge funds and would-be hostile acquirers.

Poison pills have been a thorn in the side of activist investors and acquisitive companies for nearly three decades. The provisions, established in the mid-1980s, were meant to stop corporate raiders, that decade’s biggest threat. The classic corporate raider move was to find a company whose shares had plummeted and then offer to buy out shareholders at a higher price than what the company’s stock was currently trading, but still maybe less than it would ultimately be worth. Still, shareholders looking for a quick buck would hand over their shares.

Poison pills made that move close to impossible. The provisions allow companies to offer cheap or free shares to shareholders who are friendly to the company and its current management. If a raider shows up, management floods the market with new shares to only those who are on their side. The raiders, however, who don’t get the new shares, end up with a much lower stake in the company and shares that are worth much less than before. They could then try to buy up the new shares, but management could always just flood the market again. It’s toxic to anyone trying to do this, which is where the name poison pill comes from.

But by teaming up to overthrow the board, rather than making a bid to shareholders, Ackman and Valeant may have come up with the ultimate antidote to the poison pill. Some don’t want to admit that. Hours after the judge’s verdict, prominent M&A law firm Wachtell Lipton Rosen & Katz put out a memo claiming that the judge’s ruling was actually a victory for Allergan and companies in a similar position.

Marty Lipton, a legendary corporate lawyer and the long-time head of Wachtell, has a lot at stake here. Not only is Wachtell on Allergan’s legal team, but the poison pill is very much part of Lipton’s legacy. Lipton is credited with inventing poison pill agreements back in the 1980s. Ackman and Lipton also personally don’t have a lot of love for one another. Ackman settled a long-running dispute with Carl Icahn when they both agreed that they dislike Marty Lipton more than they dislike each other.

But even Lipton seems to think the poison pill isn’t the defense it used to be, particularly in the age of activist investors looking to overthrow boards. The day after the ruling, Wachtell released another client memo, this time a three-page list of all the steps companies need to take to ward off an attack from an activist. “Reinforce your poison pill” wasn’t one of them.

Of course, some of this is Lipton taking advantage of the situation. The win for Ackman is a pretty good time for Lipton to remind clients why you need Wachtell. Others don’t think the poison pill has been totally bottled up. First of all, the judge’s decision wasn’t really about Allergan’s poison pill provision. Allergan had actually given up on its poison pill as a defense a few months ago. But, presumably, it did so because it thought it would win on insider trading charges, which it didn’t.

But Allergan (AGN) didn’t totally lose, either. The judge’s ruling, which allows Ackman to vote his shares with Valeant (VRX), did say that there was something “insider trade-y” about the way that Valeant told Ackman about its plan to make a bid for Allergan before others. But the judge said that was for others to decide, though the judge made Ackman and Valeant disclose that their bid could have some legal risks. While that’s not much of a win for Allergan—it wanted the judge to block Ackman from voting—it could cause some other hedge funds to pause from before following Ackman’s lead, particularly at time when prosecutors have been aggressive about going after hedge funds for insider trading.

“I think this ruling will put a substantial chill on activist-corporate team ups,” says John Coffee, a law professor at Columbia University. “The decision contained a sharp rebuke of Ackman’s tactics. My guess is Lipton is very happy they got that.”

What’s more, the judge making the ruling was in the 9th circuit court in California, which is not where key rulings in M&A cases get made, and therefore holds a little less sway when it comes to setting precedent. That’s usually the job of the 2nd Circuit Court of Appeals in New York for federal cases, or the Delaware court system, because that’s where many companies are incorporated, for state cases. Allergan has said it is going to appeal the ruling.

Lucian Bebchuk, a Harvard professor who has called laws that uphold poison pills provisions unconstitutional in the past, isn’t claiming a victory yet. He says the California judge’s ruling doesn’t change much. Activists always had the ability to vote out board members to get around poison pill agreements. “The poison pill remains highly relevant and [is still] the key defense tool that targets use to block offers,” says Bebchuk.

So, what happens now? Here’s the best guess: Allergan will hold its special board meeting in December. Most observers think that Valeant, with the help of Ackman’s shares, now has enough votes to oust six of Allergan’s nine board members. The rub is that Allergan’s bylaws say that while shareholders can vote out board members, they can’t appoint new ones. That job would go to Allergan’s remaining board members. Those board members are likely to put in place new board members who are friendly to Allergan’s current management.

At that point, Ackman would likely sue Allergan in Delaware court claiming that Allergan’s board is not acting in the best interest of its shareholders. Columbia’s Coffee says if Ackman wins that suit, with the court ruling that corporate boards have to defer to what shareholders perceive is in their best interests and not bylaws, then poison pills could finally be done.

“That would dramatically shift the power in takeover battles to hedge funds and activists,” says Coffee.

The fact that the poison pill is less potent than it used to be is a sign that the balance of power is shifting already.

About the Author
By Stephen Gandel
See full bioRight Arrow Button Icon

Latest in Finance

Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025

Most Popular

Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Fortune Secondary Logo
Rankings
  • 100 Best Companies
  • Fortune 500
  • Global 500
  • Fortune 500 Europe
  • Most Powerful Women
  • World's Most Admired Companies
  • See All Rankings
  • Lists Calendar
Sections
  • Finance
  • Fortune Crypto
  • Features
  • Leadership
  • Health
  • Commentary
  • Success
  • Retail
  • Mpw
  • Tech
  • Lifestyle
  • CEO Initiative
  • Asia
  • Politics
  • Conferences
  • Europe
  • Newsletters
  • Personal Finance
  • Environment
  • Magazine
  • Education
Customer Support
  • Frequently Asked Questions
  • Customer Service Portal
  • Privacy Policy
  • Terms Of Use
  • Single Issues For Purchase
  • International Print
Commercial Services
  • Advertising
  • Fortune Brand Studio
  • Fortune Analytics
  • Fortune Conferences
  • Business Development
  • Group Subscriptions
About Us
  • About Us
  • Press Center
  • Work At Fortune
  • Terms And Conditions
  • Site Map
  • About Us
  • Press Center
  • Work At Fortune
  • Terms And Conditions
  • Site Map
  • Facebook icon
  • Twitter icon
  • LinkedIn icon
  • Instagram icon
  • Pinterest icon

Latest in Finance

trump
Economynational debt
‘The national debt is now larger than the economy’: Watchdog marks 100% of GDP milestone for $39 trillion burden
By Nick LichtenbergApril 30, 2026
16 minutes ago
Elon Musk arrives at the courthouse during his trial against OpenAI
CryptoElon Musk
Elon Musk likes Bitcoin—but he just told a jury most crypto coins are scams
By Jack KubinecApril 30, 2026
28 minutes ago
zohran
PoliticsNew York City
Days after trolling billionaire Ken Griffin, Mamdani suggests King Charles should return a crown jewel to India
By Nick LichtenbergApril 30, 2026
33 minutes ago
Jamie Dimon, chief executive officer of JPMorgan Chase & Co., at the Norges Bank Investment Management annual investment conference in Oslo, Norway, on Tuesday, April 28, 2026.
EconomyJamie Dimon
For years, the risk Jamie Dimon was most concerned about was geopolitics. His answer has shifted
By Eleanor PringleApril 30, 2026
1 hour ago
inflation
EconomyInflation
The biggest jump in 3 years: gas’ effect on core inflation in March revealed
By Christopher Rugaber and The Associated PressApril 30, 2026
2 hours ago
inflation
EconomyGDP
U.S. GDP rebounds from lackluster end to 2025, grows at 2% rate in first quarter
By Paul Wiseman and The Associated PressApril 30, 2026
2 hours ago

Most Popular

Apple cofounder Ronald Wayne—whose stake would be worth up to $400 billion had he not sold it in 1976—says that at 91, he has no regrets
Success
Apple cofounder Ronald Wayne—whose stake would be worth up to $400 billion had he not sold it in 1976—says that at 91, he has no regrets
By Preston ForeApril 27, 2026
3 days ago
Jamie Dimon gets candid about national debt: ‘There will be a bond crisis, and then we’ll have to deal with it’
Economy
Jamie Dimon gets candid about national debt: ‘There will be a bond crisis, and then we’ll have to deal with it’
By Eleanor PringleApril 29, 2026
1 day ago
‘They left me no choice’: Powell isn’t going anywhere—blocking Trump from another Fed appointee
Banking
‘They left me no choice’: Powell isn’t going anywhere—blocking Trump from another Fed appointee
By Eva RoytburgApril 29, 2026
21 hours ago
‘The cost of compute is far beyond the costs of the employees’: Nvidia executive says right now AI is more expensive than paying human workers
AI
‘The cost of compute is far beyond the costs of the employees’: Nvidia executive says right now AI is more expensive than paying human workers
By Sasha RogelbergApril 28, 2026
2 days ago
Google Cloud revenue is now 18% of Alphabet's business. Is this the beginning of the end of Google's search identity?
Big Tech
Google Cloud revenue is now 18% of Alphabet's business. Is this the beginning of the end of Google's search identity?
By Alexei OreskovicApril 29, 2026
14 hours ago
‘Take the money and run’: Johns Hopkins economist Steve Hanke on why the UAE quit OPEC
Energy
‘Take the money and run’: Johns Hopkins economist Steve Hanke on why the UAE quit OPEC
By Shawn TullyApril 29, 2026
1 day ago

© 2026 Fortune Media IP Limited. All Rights Reserved. Use of this site constitutes acceptance of our Terms of Use and Privacy Policy | CA Notice at Collection and Privacy Notice | Do Not Sell/Share My Personal Information
FORTUNE is a trademark of Fortune Media IP Limited, registered in the U.S. and other countries. FORTUNE may receive compensation for some links to products and services on this website. Offers may be subject to change without notice.