Introduction

This page provides a comprehensive analysis of the known insider trading history of Michael D Lambert. Insiders are officers, directors, or significant investors in a company. It is illegal for insiders to make trades in their companies based on specific, non-public information. This does not mean it is illegal for them to make any trades in their own companies. However, they must report all trades to the SEC via a Form 4. Despite these restrictions, academic research suggests that insiders - in general - tend to outperform the market in their own companies.

Average Trade Profitability

The average trade profitability is the average return of all the open market purchases made by the insider in the last three years. To calculate this, we examine every open-market, unplanned purchase made by the insider, excluding all trades that were marked as part of a 10b5-1 trading plan. We then calculate the average performance of those trades over 3, 6, and 12 months, averaging each of those durations to generate a final performance metric for each trade. Finally, we average all of the performance metrics to calculate a performance metric for the insider. This list only includes insiders that have made at least three trades in the last two years.

If this insiders trade profitability is "N/A", then the insider either has not made any open-market purchases in the last three years, or the trades they’ve made are too recent to calculate a reliable performance metric.

Update Frequency: Daily

See the list of most profitable insider traders.

Companies with Reported Insider Positions

The SEC filings indicate Michael D Lambert has reported holdings or trades in the following companies:

Security Title Latest Reported Holdings
US:WDC / Western Digital Corporation Director 0
How to Interpret the Charts

The following charts show the stock performance of securities subsequent to each open-market, non-planned trade made by Michael D Lambert. Non-planned trade are trades that were not made as part of a 10b5-1 trading plan. The stock performance is charted as cumulative percent change in share price. For example, if an insider trade was made on January 1, 2019, the chart will show the daily percent change of the security to the present day. If the share price were to go from $10 to $15 during this time, the cumulative percent change in share price would be 50%. A change in price from $10 to $20 would be 100%, and a change in price of $10 to $5 would be -50%.

Ultimately, we are trying to determine how closely the insider’s trades correlate to excess returns (positive or negative) in the share price in order to see if the insider is timing their trades to profit from insider information. Consider the situation where an insider was doing this. In this situation, we would expect either (a) positive returns after purchases, or (b) negative returns after sales. In the case of (a), the PURCHASE chart would show a series of upwardly sloping curves, indicating positive returns after each purchase transaction. In the case of (b), the SALE chart would show a series of downward sloping curves, indicating negative returns after each sale transaction.

However, this alone is not enough to draw conclusions. If, for example, the share price of the company was in a non-cyclical climb over many years, then we would expect all the post-purchase plots to be upwardly sloping. Likewise, non-cyclical declines over many years would result in downward sloping post-trade plots. Neither of these charts would suggest insider trading activity.

The strongest indicator would be a situation where the share price was extremely cyclical, and there were both positive signals in the PURCHASE chart and negative plots on the SALE chart. This situation would be highly suggestive of an insider that was timing trades to their financial advantage.

Insider Trading History

This table shows the complete list of insider trades made by Michael D Lambert as disclosed to the Securities Exchange Commission (SEC).

File Date Tran Date Form Ticker Security Code 10b5-1 Shares Remaining Shares Percent
Change
Share
Price
Tran
Value
Remaining
Value
2019-11-12 2019-11-07 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
M - Exercise -203 0 -100.00
2019-11-12 2019-11-07 4 WDC WESTERN DIGITAL CORP
Common Stock
M - Exercise 202 26,324 0.77
2019-10-24 2019-10-22 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
A - Award 43 203 27.18
2019-07-17 2019-07-15 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
A - Award 46 160 40.87
2019-04-17 2019-04-15 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
A - Award 48 113 74.35
2019-01-16 2019-01-14 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
A - Award 65 65
2018-11-08 2018-11-07 4 WDC WESTERN DIGITAL CORP
Common Stock
A - Award 4,945 26,122 23.35
2018-11-06 2018-11-02 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
M - Exercise -74 0 -100.00
2018-11-06 2018-11-02 4 WDC WESTERN DIGITAL CORP
Common Stock
M - Exercise 73 21,177 0.35
2018-10-17 2018-10-15 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
A - Award 25 74 51.98
2018-07-18 2018-07-16 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
A - Award 17 49 55.99
2018-05-16 2018-05-16 4 WDC WESTERN DIGITAL CORP
Non-Qualified Stock Option (right to buy)
M - Exercise -11,542 0 -100.00
2018-05-16 2018-05-16 4 WDC WESTERN DIGITAL CORP
Common Stock
S - Sale -11,542 21,104 -35.36 85.88 -991,202 1,812,365
2018-05-16 2018-05-16 4 WDC WESTERN DIGITAL CORP
Common Stock
M - Exercise 11,542 32,646 54.69 25.79 297,668 841,940
2018-04-18 2018-04-16 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
A - Award 15 31 93.22
2018-01-17 2018-01-16 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
A - Award 16 16
2017-11-03 2017-11-02 4 WDC WESTERN DIGITAL CORP
Common Stock
A - Award 2,708 21,104 14.72
2017-11-03 2017-11-01 4 WDC WESTERN DIGITAL CORP
Non-Qualified Stock Option (right to buy)
M - Exercise -1,063 0 -100.00
2017-11-03 2017-11-01 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
M - Exercise -99 0 -100.00
2017-11-03 2017-11-01 4 WDC WESTERN DIGITAL CORP
Common Stock
M - Exercise 98 18,396 0.54
2017-11-03 2017-11-01 4 WDC WESTERN DIGITAL CORP
Common Stock
S - Sale -1,063 18,298 -5.49 89.36 -94,984 1,635,018
2017-11-03 2017-11-01 4 WDC WESTERN DIGITAL CORP
Common Stock
M - Exercise 1,063 19,361 5.81 32.99 35,068 638,719
2017-10-16 2017-10-16 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
A - Award 24 99 32.01
2017-07-19 2017-07-17 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
A - Award 22 75 41.31
2017-04-19 2017-04-17 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
A - Award 24 53 85.69
2017-01-19 2017-01-17 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
A - Award 29 29
2016-11-07 2016-11-04 4 WDC WESTERN DIGITAL CORP
Common Stock
A - Award 4,089 18,298 28.78
2016-11-07 2016-11-03 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
M - Exercise -140 0 -100.00
2016-11-07 2016-11-03 4 WDC WESTERN DIGITAL CORP
Common Stock
M - Exercise 140 14,209 1.00
2016-10-19 2016-10-17 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
A - Award 32 140 29.46
2016-07-19 2016-07-15 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
A - Award 32 108 42.93
2016-04-18 2016-04-15 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
A - Award 41 76 117.91
2016-01-20 2016-01-15 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
A - Award 35 35
2015-11-05 2015-11-03 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
M - Exercise -48 0 -100.00
2015-11-05 2015-11-03 4 WDC WESTERN DIGITAL CORP
Common Stock
A - Award 3,282 14,069 30.43
2015-11-05 2015-11-03 4 WDC WESTERN DIGITAL CORP
Common Stock
M - Exercise 48 10,787 0.45
2015-10-19 2015-10-15 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
A - Award 14 48 40.74
2015-07-16 2015-07-15 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
A - Award 14 34 71.62
2015-04-20 2015-04-16 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
A - Award 11 20 134.29
2015-01-20 2015-01-15 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
A - Award 8 8
2014-11-24 2014-11-20 4 WDC WESTERN DIGITAL CORP
Common Stock
S - Sale -5,000 10,739 -31.77 101.20 -505,987 1,086,759
2014-11-18 2014-11-18 4 WDC WESTERN DIGITAL CORP
Common Stock
S - Sale -5,000 15,739 -24.11 100.13 -500,642 1,575,919
2014-11-12 2014-11-10 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
M - Exercise -200 0 -100.00
2014-11-12 2014-11-10 4 WDC WESTERN DIGITAL CORP
Common Stock
M - Exercise 200 20,739 0.97
2014-11-06 2014-11-05 4 WDC WESTERN DIGITAL CORP
Common Stock
A - Award 2,221 20,539 12.12
2014-11-06 2014-11-04 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
M - Exercise -46 200 -18.73
2014-11-06 2014-11-04 4 WDC WESTERN DIGITAL CORP
Common Stock
M - Exercise 46 18,318 0.25
2014-10-16 2014-10-15 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
A - Award 38 247 18.05
2014-08-25 2014-08-21 4 WDC WESTERN DIGITAL CORP
Non-Qualified Stock Option (right to buy)
M - Exercise -6,909 0 -100.00
2014-08-25 2014-08-21 4 WDC WESTERN DIGITAL CORP
Non-Qualified Stock Option (right to buy)
M - Exercise -7,443 1,063 -87.50
2014-08-25 2014-08-21 4 WDC WESTERN DIGITAL CORP
Common Stock
S - Sale -14,352 18,272 -43.99 100.37 -1,440,575 1,834,043
2014-08-25 2014-08-21 4 WDC WESTERN DIGITAL CORP
Common Stock
M - Exercise 6,909 32,624 26.87 38.53 266,204 1,257,003
2014-08-25 2014-08-21 4 WDC WESTERN DIGITAL CORP
Common Stock
M - Exercise 7,443 25,715 40.73 32.99 245,545 848,338
2014-07-16 2014-07-15 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
A - Award 32 209 18.34
2014-04-17 2014-04-15 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
A - Award 27 177 17.84
2014-01-17 2014-01-15 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
A - Award 27 150 21.74
2013-11-14 2013-11-14 4 WDC WESTERN DIGITAL CORP
Common Stock
A - Award 2,966 18,272 19.38
2013-11-14 2013-11-12 4 WDC WESTERN DIGITAL CORP
Common Stock
S - Sale -10,000 15,306 -39.52 71.85 -718,500 1,099,736
2013-11-12 2013-11-11 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
M - Exercise -96 123 -43.88
2013-11-12 2013-11-11 4 WDC WESTERN DIGITAL CORP
Common Stock
M - Exercise 96 25,306 0.38
2013-11-12 2013-11-08 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
M - Exercise -118 219 -34.99
2013-11-12 2013-11-08 4 WDC WESTERN DIGITAL CORP
Common Stock
M - Exercise 117 25,210 0.47
2013-10-17 2013-10-15 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
A - Award 56 337 20.02
2013-07-17 2013-07-15 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
A - Award 56 281 24.95
2013-05-10 2013-05-09 4 WDC WESTERN DIGITAL CORP
Non-Qualified Stock Option (right to buy)
M - Exercise -7,364 0 -100.00
2013-05-10 2013-05-09 4 WDC WESTERN DIGITAL CORP
Non-Qualified Stock Option (right to buy)
M - Exercise -16,743 0 -100.00
2013-05-10 2013-05-09 4 WDC WESTERN DIGITAL CORP
Common Stock
S - Sale -24,107 25,093 -49.00 57.34 -1,382,225 1,438,760
2013-05-10 2013-05-09 4 WDC WESTERN DIGITAL CORP
Common Stock
M - Exercise 7,364 49,200 17.60 27.64 203,541 1,359,888
2013-05-10 2013-05-09 4 WDC WESTERN DIGITAL CORP
Common Stock
M - Exercise 16,743 41,836 66.72 15.34 256,838 641,764
2013-04-16 2013-04-15 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
A - Award 74 225 49.53
2013-02-15 2013-02-14 4 WDC WESTERN DIGITAL CORP
Non-Qualified Stock Option (right to buy)
M - Exercise -9,185 0 -100.00
2013-02-15 2013-02-14 4 WDC WESTERN DIGITAL CORP
Non-Qualified Stock Option (right to buy)
M - Exercise -12,500 0 -100.00
2013-02-15 2013-02-14 4 WDC WESTERN DIGITAL CORP
Common Stock
S - Sale -21,685 25,093 -46.36 48.85 -1,059,371 1,225,861
2013-02-15 2013-02-14 4 WDC WESTERN DIGITAL CORP
Common Stock
M - Exercise 12,500 46,778 36.47 13.76 172,000 643,665
2013-02-15 2013-02-14 4 WDC WESTERN DIGITAL CORP
Common Stock
M - Exercise 9,185 34,278 36.60 19.09 175,342 654,367
2012-12-28 2012-12-26 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
A - Award 90 150 149.05
2012-12-21 2012-12-20 4 WDC WESTERN DIGITAL CORP
Common Stock
S - Sale -11,484 25,093 -31.40 42.03 -482,692 1,054,701
2012-11-13 2012-11-11 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
M - Exercise -23 60 -27.31
2012-11-13 2012-11-11 4 WDC WESTERN DIGITAL CORP
Common Stock
M - Exercise 22 36,577 0.06
2012-11-13 2012-11-08 4 WDC WESTERN DIGITAL CORP
Common Stock
A - Award 6,458 36,555 21.46
2012-10-17 2012-10-15 4 WDC WESTERN DIGITAL CORP
Dividend Equivalent Rights
A - Award 83 83
2007-11-08 2007-11-06 4 WDC WESTERN DIGITAL CORP
Non-Qualified Stock Option (right to buy)
A - Award 7,364 7,364
2004-01-05 2004-01-01 4 WDC WESTERN DIGITAL CORP
Phantom Stock
A - Award 2,100 2,100
2004-01-05 2004-01-01 4 WDC WESTERN DIGITAL CORP
Common Stock
A - Award 1,696 6,500 35.30 11.79 19,996 76,635
P
Open market or private purchase of non-derivative or derivative security
S
Open market or private sale of non-derivative or derivative security
A
Grant, award, or other acquisition of securities from the company (such as an option)
C
Conversion of derivative
D
Sale or transfer of securities back to the company
F
Payment of exercise price or tax liability using portion of securities received from the company
G
Gift of securities by or to the insider
K
Equity swaps and similar hedging transactions
M
Exercise or conversion of derivative security received from the company (such as an option)
V
A transaction voluntarily reported on Form 4
J
Other (accompanied by a footnote describing the transaction)