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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.
| 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 |
.
| 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.
| 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
| 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
| 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
| 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
| 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
| 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
| 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
| 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
| 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
| 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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