What Is a Poison Pill

What Is a Poison Pill in Finance?

7 min read

What is a poison pill? What does this have to do with investing? This was relevant for those who followed the Elon Musk and Twitter saga. Elon Musk attempted a hostile takeover of Twitter for $54.20 per share. Twitter’s board was not accepting Musk’s takeover. So they defended themselves and their shareholders with a poison pill defense, also known as a shareholder rights plan. What is it, has it been used before, and who is this protecting? All these questions and more will be answered below.

To begin with, what is a poison pill? The poison pill defense has been around since the 1980s. The term was coined by a New York legal firm called Wachtell, Lipton, Rosen, and Katz.

When captured, spies carried a poison pill to avoid revealing information to their enemies. Nowadays, It is a very effective way to prevent a hostile takeover of a company.

In a nutshell, existing shareholders are given the right to purchase shares at a discounted price. As a result, the opposing party’s ownership effectively decreases.

This makes it more expensive for the potential new owner since they must purchase more shares to take over the company. Therefore, the hostile takeover immediately becomes less attractive. 

Types of Poison Pills

Types of Poison Pills

There are two types of poison pills. The first is the flip-in poison pill. Only existing shareholders, not the acquirer, are allowed to purchase discounted shares. This effectively dilutes the opposing party’s stake in the company, making it more expensive to succeed in the takeover. 

The second type is the flip-over poison pill. Existing shareholders can only purchase discounted shares if the takeover attempt is successful. This can be perceived as a last-effort attempt to dissuade the party from taking over the company if a dilution occurs after the takeover. 

Effects of a Poison Pill

A poison pill can lead to many outcomes regarding stock price, management, hostile takeover, and shareholders. A poison pill is only triggered if the opposing party purchases a certain percentage of shares. This percentage differs for every company.

1. Stock Price

The stock price will decrease if dilution is created by releasing outstanding shares to prevent the takeover. As a result, existing shareholders have no choice but to purchase cheaper shares to stay even.

Since the stock price has already risen due to more stock being purchased by the opposing party, it can quickly decrease if the same party decides to change its mind and sell its stake in the company. This can leave shareholders in a precarious place.

On the other hand, the stock price can go even higher. The opposing party might double down on their decision and buy even more shares. If the takeover is beneficial for the company’s future, institutional investors can also join the fun. Ultimately, this will benefit shareholders. This depends on how willing the hostile party is to purchase the company.

2. Management

There are different reasons why a hostile takeover is initiated. In some cases, it is to combine different businesses. It can also be done to replace incompetent management and change a company’s direction. We will examine examples for Papa John’s, Netflix, and Twitter. Each has its particularities.

Day Trading Course Options Trading Course Futures Trading Course
DESCRIPTION Learn how to read penny stock charts, premarket preparation, target buy and sell zones, scan for stocks to trade, and get ready for live day trading action
Learn how to buy and sell options, assignment options, implement vertical spreads, and the most popular strategies, and prepare for live options trading How to read futures charts, margin requirements, learn the COT report, indicators, and the most popular trading strategies, and prepare for live futures trading

Historical Poison Pill Examples

We will look at a few examples over the last years to better understand the effects and actions undertaken during a poison pill defense.

1. Netflix (NASDAQ: NFLX)

In 2012, Netflix was nowhere near as successful as it is today. Its streaming service was in the early stages of development, and its stock was less than $10.

Activist investor and billionaire Carl Icahn decided to undertake a hostile takeover of Netflix. As a result, the company’s stock was falling, subscribers were decreasing, and its streaming business wasn’t growing as expected.

Icahn saw great potential in Netflix and wanted to shake things up. Other tech companies were interested in a Netflix takeover but didn’t act on it.

In November 2012, Icahn disclosed he owned 9.98% of the company. In response, Netflix announced it would adopt the poison pill defense if Icahn reached the 10% threshold. Their plan included a 2-for-1 discount on shares if a successful takeover (flip-over poison pill) was underway. Netflix successfully convinced Icahn to retreat and look where it is now.

Fun fact: Netflix released their Q1 earnings after hours on April 19th. This was the first time the company lost subscribers since this hostile takeover attempt in 2012, one decade later. Netflix lost 200k subscribers in Q1 and expects another 2M by July. To prevent this, they are cracking down on password sharing. So the next few months will be interesting for them.

Poison Pill Papa Johns

2. Papa John’s (NASDAQ: PZZA)

In the summer of 2018, the news of Papa John’s founder, John Schnatter, being ousted as chairman for using a racial slur and then trying to undertake a hostile takeover made the news. 

Back then, Mr Schnatter already owned 30% of the company. He was the largest shareholder. This was a rare occasion when a company founder wanted to take control but wasn’t allowed to by the board and shareholders.

Papa John’s shareholders voted to undertake a poison pill defense if Mr. Schnatter moved his stake in the company to 31% or if anyone bought 15% without the board’s approval.

Under these circumstances, existing shareholders could purchase discounted shares to dilute anyone interested in the takeover. As a result, increasing ownership in Papa John’s would become more expensive. Schnatter was also excluded from any dividend distributions. The hostile takeover attempt ended there since the stock has been performing well.

3. Twitter (NYSE: TWTR)

To conclude this section, our main story. Elon Musk submitted a bid to buy Twitter. However, Musk’s motives for this takeover had little to do with money.

He targeted this social media giant for its part in the free speech movement and for spreading misinformation. He says it is a turning point for our civilization.

Musk already invested $2.64B, representing a 9.2% stake in Twitter, and proposed spending $43B more for its purchase. He is currently worth more than $250B. Twitter’s board responded with a poison pill, which will come into effect if anyone succeeds in acquiring more than 15% of the company.

Musk, receiving 51% of the shareholder’s votes, can replace the current board and enact his master plan. One of Twitter’s biggest shareholders is Mohammed Bin Salman. He is the Saudi crown prince and deputy prime minister. He strongly opposed Musk’s plan.

This led to many questions about the Saudi government’s use and influence of Twitter. Musk’s plan to promote free speech and remove misinformation is a double-edged sword.

Many view it as dangerous to our society, while others are tired of being censored. Unfortunately, he also has very little experience in this industry other than tweeting about absolute randomness. 

Final Thoughts: What Is a Poison Pill?

To conclude, a poison pill is a very effective strategy to prevent a hostile takeover from an inside or outside investor. Shareholders can easily find themselves on the winning or losing side. In the first two examples, the stock rose after the proposal. As for Twitter, it is too early to know.

After Musk’s initial purchase, it rose over 25%. The next weeks will dictate the future of Twitter and maybe of free speech and misinformation. Apart from Twitter, the poison pill defense has been very successful for other companies, with little damage done to the core of the business. 

Related Articles

Black Friday Stocks

Black Friday Stocks to Watch

Thanksgiving and Black Friday mark the start of the holiday shopping season. It provides a unique lens through which investors can gauge consumer sentiment, economic

Read More »


If you’ve looked for trading education elsewhere then you’ll notice that it can be very costly.

We are opposed to charging ridiculous amounts to access experience and quality information. 

That being said, our website is a great resource for traders or investors of all levels to learn about day trading stocks, futures, and options. Swing trading too! 

On our site, you will find thousands of dollars worth of free online trading courses, tutorials, and reviews.

We put all of the tools available to traders to the test and give you first-hand experience in stock trading you won’t find elsewhere.

Our content is packed with the essential knowledge that’s needed to help you to become a successful trader.

It’s important to treat day trading stocks, options, futures, and swing trading like you would with getting a professional degree, a new trade, or starting any new career.

Invest the proper time into your Trading Education and don’t try to run before you learn to crawl. Trading stocks is not a get-rich-quick scheme. It’s not gambling either, though there are people who treat it this way. Don’t be that person! 


The Bullish Bears team focuses on keeping things as simple as possible in our online trading courses and chat rooms. We provide our members with courses of all different trading levels and topics.

If you’re a beginner, intermediate level, or looking for expert trading knowledge…we’ve got you covered. 

We have a basic stock trading course, swing trading course, 2 day trading courses, 2 options courses, 2 candlesticks courses, and broker courses to help you get started. Free.

Just choose the course level that you’re most interested in and get started on the right path now. Become a leader, not a follower. When you’re ready you can join our chat rooms and access our Next Level training library. No rush. We’re here to help.

Click Here to take our free courses.