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The effects of controversies on share prices
A rogue tweet can have a major impact
Share prices fluctuate every day, and are particularly prone to change when the company concerned features in the news. We studied some particularly noteworthy instances of this, to demonstrate how a single event, and public perception, can have a major effect on a company’s value.
The best and the worst
The most dramatic drop belongs to BP, thanks to its disastrous oil spill in 2010. Its share price dropped by 20%, decreasing its total value by £14 billion.
BP share price before and after the oil spill
| Date | BP share price |
|---|---|
| 2010-04-13 | 640.7 |
| 2010-04-14 | 643.1 |
| 2010-04-15 | 653 |
| 2010-04-16 | 641.8 |
| 2010-04-19 | 642.5 |
| 2010-04-20 Day of event! | 655.4 |
| 2010-04-21 | 648.2 |
| 2010-04-22 | 636.4 |
| 2010-04-23 | 639.7 |
| 2010-04-26 | 626.8 |
| 2010-04-27 | 610 |
| 2010-04-28 | 625 |
| 2010-04-29 | 584.2 |
| 2010-04-30 | 575.5 |
| 2010-05-04 | 558.5 |
| 2010-05-05 | 565 |
| 2010-05-06 | 567 |
| 2010-05-07 | 553.9 |
| 2010-05-10 | 549.2 |
| 2010-05-11 | 545.5 |
| 2010-05-12 | 541.6 |
| 2010-05-13 | 547.6 |
| 2010-05-14 | 530.2 |
| 2010-05-17 | 529.9 |
| 2010-05-18 | 534 |
| 2010-05-19 | 523.5 |
| 2010-05-20 | 528.8 |
| 2010-05-21 | 506.7 |
| 2010-05-24 | 493 |
| 2010-05-25 | 485.2 |
| 2010-05-26 | 492 |
| 2010-05-27 | 520.8 |
| 2010-05-28 | 494.8 |
| 2010-06-01 | 430 |
| 2010-06-02 | 429.75 |
| 2010-06-03 | 432.25 |
| 2010-06-04 | 433.35 |
| 2010-06-07 | 430.3 |
| 2010-06-08 | 408.9 |
| 2010-06-09 | 391.55 |
| 2010-06-10 | 365.5 |
| 2010-06-11 | 391.9 |
| 2010-06-14 | 355.45 |
| 2010-06-15 | 342 |
| 2010-06-16 | 337 |
| 2010-06-17 | 359.7 |
| 2010-06-18 | 357.45 |
| 2010-06-21 | 349.5 |
| 2010-06-22 | 334.2 |
| 2010-06-23 | 333.5 |
| 2010-06-24 | 325.25 |
| 2010-06-25 | 304.6 |
| 2010-06-28 | 308.25 |
Before the oil spill, BP’s share price was fluctuating around 650 GBp(Great British pence). In the months that followed, this price decreased steadily, reaching a low of 304.6p. Since then, the price has recovered significantly, sitting at 546p.
.
Weight Watchers’ share price before and after Oprah Winfrey’s Golden Globe speech
| Date | Weightwatchers share price |
|---|---|
| 2017-12-14 | 45.33 |
| 2017-12-15 | 45.34 |
| 2017-12-18 | 47.02 |
| 2017-12-19 | 45.85 |
| 2017-12-20 | 46.77 |
| 2017-12-21 | 47.45 |
| 2017-12-22 | 50.52 |
| 2017-12-26 | 48.79 |
| 2017-12-27 | 49.35 |
| 2017-12-28 | 47.38 |
| 2017-12-29 | 44.28 |
| 2018-01-02 | 47.83 |
| 2018-01-03 | 47.18 |
| 2018-01-04 | 46.7 |
| 2018-01-05 Day of event! | 46.91 |
| 2018-01-08 | 52.62 |
| 2018-01-09 | 57.37 |
| 2018-01-10 | 56.89 |
| 2018-01-11 | 56.98 |
| 2018-01-12 | 59.44 |
| 2018-01-16 | 59.21 |
| 2018-01-17 | 61.84 |
| 2018-01-18 | 61.19 |
| 2018-01-19 | 63.5 |
| 2018-01-22 | 64.86 |
| 2018-01-23 | 67.7 |
| 2018-01-24 | 67.34 |
The biggest rise in our analysis occurred in thanks to Oprah Winfrey, a shareholder and icon of Weight Watchers. Her January 2018 speech at the Golden Globes awards increased the value of Weight Watchers’ shares by 14%, from US$46.91 to $52.62. Since then, Weight Watchers’ shares have risen higher still, to $64.52.
Other drops in share price
Tesla share price before and after Elon Musk’s emotional interview
| Date | Tesla share price |
|---|---|
| 2018-08-07 | 379.57 |
| 2018-08-08 | 370.34 |
| 2018-08-09 | 352.45 |
| 2018-08-10 | 355.49 |
| 2018-08-13 | 356.41 |
| 2018-08-14 | 347.64 |
| 2018-08-15 | 338.69 |
| 2018-08-16 Day of event! | 335.45 |
| 2018-08-17 | 305.5 |
| 2018-08-20 | 308.44 |
| 2018-08-21 | 321.9 |
| 2018-08-22 | 321.64 |
| 2018-08-23 | 320.1 |
Event: In August 2018, an interview with Elon Musk caused Tesla share prices to drop by 9%, after he divulged the details of his “excruciating” year.
Source: The Express
Juventus shares before and after Cristiano Ronaldo’s rape allegation
| Date | Juventus share price |
|---|---|
| 2018-09-24 | 1.54 |
| 2018-09-25 | 1.53 |
| 2018-09-26 | 1.54 |
| 2018-09-27 | 1.52 |
| 2018-09-28 | 1.47 |
| 2018-10-01 | 1.47 |
| 2018-10-02 Day of event! | 1.45 |
| 2018-10-03 | 1.33 |
| 2018-10-04 | 1.32 |
| 2018-10-05 | 1.19 |
| 2018-10-08 | 1.14 |
| 2018-10-09 | 1.14 |
| 2018-10-10 | 1.07 |
| 2018-10-11 | 1.09 |
| 2018-10-12 | 1.03 |
| 2018-10-15 | 1.07 |
| 2018-10-16 | 1.15 |
| 2018-10-17 | 1.05 |
| 2018-10-18 | 1.05 |
| 2018-10-19 | 1.01 |
Event: Cristiano Ronaldo accused of rape, which he denies
Source: BBC news
Facebook shares before and after it announces revenue growth rate decline
| Date | Facebook share price |
|---|---|
| 2018-07-16 | 207.23 |
| 2018-07-17 | 209.99 |
| 2018-07-18 | 209.36 |
| 2018-07-19 | 208.09 |
| 2018-07-20 | 209.94 |
| 2018-07-23 | 210.91 |
| 2018-07-24 | 214.67 |
| 2018-07-25 Day of event! | 217.5 |
| 2018-07-26 | 176.26 |
| 2018-07-27 | 174.89 |
| 2018-07-30 | 171.06 |
| 2018-07-31 | 172.58 |
| 2018-08-01 | 171.65 |
Event: Facebook announced revenue growth rates will continue to decelerate.
Source: The Guardian
Facebook before and after the Cambridge Analytica data compromise story
| Date | Facebook share price |
|---|---|
| 2018-03-07 | 183.71 |
| 2018-03-08 | 182.34 |
| 2018-03-09 | 185.23 |
| 2018-03-12 | 184.76 |
| 2018-03-13 | 181.88 |
| 2018-03-14 | 184.19 |
| 2018-03-15 | 183.86 |
| 2018-03-16 Day of event! | 185.09 |
| 2018-03-19 | 172.56 |
| 2018-03-20 | 168.15 |
| 2018-03-21 | 169.39 |
| 2018-03-22 | 164.89 |
| 2018-03-23 | 159.39 |
| 2018-03-26 | 160.06 |
| 2018-03-27 | 152.22 |
Event: Facebook stock value plunges after it’s revealed that 50 million people may have had data compromised by Cambridge Analytica.
Source: CBS News
Snapchat shares after Kylie Jenner announces Snapchat is dead
| Date | Snapchat share price |
|---|---|
| 2018-02-07 | 20.75 |
| 2018-02-08 | 19.39 |
| 2018-02-09 | 18.8 |
| 2018-02-12 | 18.63 |
| 2018-02-13 | 18.58 |
| 2018-02-14 | 19.56 |
| 2018-02-15 | 19.75 |
| 2018-02-16 | 20.42 |
| 2018-02-20 | 18.93 |
| 2018-02-21 Day of event! | 18.64 |
| 2018-02-22 | 17.51 |
| 2018-02-23 | 17.45 |
| 2018-02-26 | 17.09 |
| 2018-02-27 | 16.32 |
| 2018-02-28 | 17.32 |
Event: Snapchat declared dead on 21 February 2018 by Kylie Jenner.
Source: The Verge
Toyota share prices before and after a President Trump tweet
| Date | Toyota share price |
|---|---|
| 2017-01-03 | 118.55 |
| 2017-01-04 | 121.19 |
| 2017-01-05 Day of event! | 120.44 |
| 2017-01-06 | 120.13 |
| 2017-01-09 | 119.74 |
| 2017-01-10 | 119.76 |
| 2017-01-11 | 119.91 |
| 2017-01-12 | 119.64 |
| 2017-01-13 | 119.81 |
| 2017-01-17 | 118.41 |
| 2017-01-18 | 118.79 |
| 2017-01-19 | 119.31 |
| 2017-01-20 | 118.92 |
| 2017-01-23 | 118.29 |
| 2017-01-24 | 117.64 |
| 2017-01-25 | 119.06 |
| 2017-01-26 | 118.98 |
| 2017-01-27 | 116.69 |
| 2017-01-30 | 116.07 |
| 2017-01-31 | 115.75 |
| 2017-02-01 | 115.26 |
| 2017-02-02 | 114.53 |
| 2017-02-03 | 115.12 |
| 2017-02-06 | 113.31 |
| 2017-02-07 | 113.04 |
| 2017-02-08 | 113.27 |
| 2017-02-09 | 111.92 |
Event: US president Donald Trump tweets “Toyota Motor said will build a new plant in Baja, Mexico, to build Corolla cars for U.S. NO WAY! Build plant in U.S. or pay big border tax.”
Source: The Independent
Amazon shares before and after another President Trump tweet
| Date | Amazon share price |
|---|---|
| 2018-03-14 | 1591 |
| 2018-03-15 | 1582.32 |
| 2018-03-16 | 1571.68 |
| 2018-03-19 | 1544.93 |
| 2018-03-20 | 1586.51 |
| 2018-03-21 | 1581.86 |
| 2018-03-22 | 1544.92 |
| 2018-03-23 | 1495.56 |
| 2018-03-26 | 1555.86 |
| 2018-03-27 | 1497.05 |
| 2018-03-28 | 1431.42 |
| 2018-03-29 | 1447.34 |
| 2018-04-02 | 1371.99 |
| 2018-04-03 | 1392.05 |
| 2018-04-04 | 1410.57 |
| 2018-04-05 | 1451.75 |
| 2018-04-06 | 1405.23 |
Event: US president Donald Trump tweets “It is reported that the U.S. Post Office will lose $1.50 on average for each package it delivers for Amazon. That amounts to billions of dollars.”
Source: Medium
Share price increases
Apple shares after it becomes the first US company to be worth $1 trillion
| Date | Apple share price |
|---|---|
| 2018-07-18 | 190.4 |
| 2018-07-19 | 191.88 |
| 2018-07-20 | 191.44 |
| 2018-07-23 | 191.61 |
| 2018-07-24 | 193 |
| 2018-07-25 | 194.82 |
| 2018-07-26 | 194.21 |
| 2018-07-27 | 190.98 |
| 2018-07-30 | 189.91 |
| 2018-07-31 Day of event! | 190.29 |
| 2018-08-01 | 201.5 |
| 2018-08-02 | 207.39 |
| 2018-08-03 | 207.99 |
| 2018-08-06 | 209.07 |
| 2018-08-07 | 207.11 |
| 2018-08-08 | 207.25 |
| 2018-08-09 | 208.88 |
| 2018-08-10 | 207.53 |
| 2018-08-13 | 208.87 |
| 2018-08-14 | 209.75 |
Event: Apple became world’s first trillion-dollar company
Source: The Guardian
Nike before and after its Colin Kaepernick advert
| Date | Nike Share Price |
|---|---|
| 2018-08-21 | 82.02 |
| 2018-08-22 | 82.28 |
| 2018-08-23 | 82.34 |
| 2018-08-24 | 82.1 |
| 2018-08-27 | 82.23 |
| 2018-08-28 | 82.48 |
| 2018-08-29 | 82.22 |
| 2018-08-30 | 81.01 |
| 2018-08-31 Day of event! | 82.2 |
| 2018-09-04 | 79.6 |
| 2018-09-05 | 79.92 |
| 2018-09-06 | 80.4 |
| 2018-09-07 | 80.3 |
| 2018-09-10 | 82.1 |
| 2018-09-11 | 82.63 |
| 2018-09-12 | 83 |
| 2018-09-13 | 83.47 |
| 2018-09-14 | 83.49 |
| 2018-09-17 | 83.26 |
| 2018-09-18 | 85.26 |
Event: Nike shares dropped, then rose to higher than before, after Colin Kaepernick became the new face of its “Just Do It” ads.
Source: Markets Insider
Apple shares before and after a Carl Icahn tweet
| Date | Apple |
|---|---|
| 2013-07-31 | 64.65 |
| 2013-08-01 | 65.24 |
| 2013-08-02 | 66.08 |
| 2013-08-05 | 67.06 |
| 2013-08-06 | 66.46 |
| 2013-08-07 | 66.43 |
| 2013-08-08 | 65.86 |
| 2013-08-09 | 64.92 |
| 2013-08-12 Day of event! | 66.77 |
| 2013-08-13 | 69.94 |
| 2013-08-14 | 71.21 |
| 2013-08-15 | 71.13 |
| 2013-08-16 | 71.76 |
| 2013-08-19 | 72.53 |
| 2013-08-20 | 71.58 |
| 2013-08-21 | 71.77 |
| 2013-08-22 | 71.85 |
Event: Carl Icahn tweeted “We currently have a large position in APPLE. We believe the company to be extremely undervalued. Spoke to Tim Cook today. More to come.”
Source: Financial Post
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