Introduction

This page provides a comprehensive analysis of the known insider trading history of Marc Grondahl. 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.

See Highest Ranking Insiders
Companies with Reported Insider Positions

The SEC filings indicate Marc Grondahl has reported holdings or trades in the following companies:

Security Title Latest Reported Holdings
US:PLNT / Planet Fitness, Inc. Director 4,367,695
How to Interpret the Charts

The following charts show the stock performance of securities subsequent to each open-market, non-planned trade made by Marc Grondahl. 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 Marc Grondahl 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
2017-01-18 2017-01-13 4 PLNT Planet Fitness, Inc.
Holding Units and Class B common stock 		C - Conversion X -99,949 4,367,695 -2.24
2017-01-18 2017-01-13 4 PLNT Planet Fitness, Inc.
Class A Common Stock 		S - Sale X -99,949 0 -100.00 20.63 -2,061,898
2017-01-18 2017-01-13 4 PLNT Planet Fitness, Inc.
Class A Common Stock 		C - Conversion X 99,949 99,949
2017-01-17 2017-01-12 4 PLNT Planet Fitness, Inc.
Holding Units and Class B common stock 		C - Conversion X -96,582 4,467,644 -2.12
2017-01-17 2017-01-12 4 PLNT Planet Fitness, Inc.
Class A Common Stock 		S - Sale X -96,582 0 -100.00 20.37 -1,967,607
2017-01-17 2017-01-12 4 PLNT Planet Fitness, Inc.
Class A Common Stock 		C - Conversion X 96,582 96,582
2017-01-13 2017-01-11 4 PLNT Planet Fitness, Inc.
Holding Units and Class B common stock 		C - Conversion X -94,289 4,564,226 -2.02
2017-01-13 2017-01-11 4 PLNT Planet Fitness, Inc.
Class A Common Stock 		S - Sale X -94,289 0 -100.00 20.47 -1,929,634
2017-01-13 2017-01-11 4 PLNT Planet Fitness, Inc.
Class A Common Stock 		C - Conversion X 94,289 94,289
2017-01-12 2017-01-10 4 PLNT Planet Fitness, Inc.
Holding Units and Class B common stock 		C - Conversion X -117,220 4,658,515 -2.45
2017-01-12 2017-01-10 4 PLNT Planet Fitness, Inc.
Class A Common Stock 		S - Sale X -117,220 0 -100.00 20.07 -2,352,652
2017-01-12 2017-01-10 4 PLNT Planet Fitness, Inc.
Class A Common Stock 		C - Conversion X 117,220 117,220
2017-01-11 2017-01-09 4 PLNT Planet Fitness, Inc.
Holding Units and Class B common stock 		C - Conversion X -46,251 4,775,735 -0.96
2017-01-11 2017-01-09 4 PLNT Planet Fitness, Inc.
Class A Common Stock 		S - Sale X -46,251 0 -100.00 20.02 -925,755
2017-01-11 2017-01-09 4 PLNT Planet Fitness, Inc.
Class A Common Stock 		C - Conversion X 46,251 46,251
2017-01-10 2017-01-06 4 PLNT Planet Fitness, Inc.
Holding Units and Class B common stock 		C - Conversion X -52,591 4,821,986 -1.08
2017-01-10 2017-01-06 4 PLNT Planet Fitness, Inc.
Class A Common Stock 		S - Sale X -52,591 0 -100.00 20.07 -1,055,286
2017-01-10 2017-01-06 4 PLNT Planet Fitness, Inc.
Class A Common Stock 		C - Conversion X 52,591 52,591
2017-01-09 2017-01-05 4 PLNT Planet Fitness, Inc.
Holding Units and Class B common stock 		C - Conversion X -63,092 4,874,577 -1.28
2017-01-09 2017-01-05 4 PLNT Planet Fitness, Inc.
Class A Common Stock 		S - Sale X -63,092 0 -100.00 20.14 -1,270,603
2017-01-09 2017-01-05 4 PLNT Planet Fitness, Inc.
Class A Common Stock 		C - Conversion X 63,092 63,092
2017-01-06 2017-01-04 4 PLNT Planet Fitness, Inc.
Holding Units and Class B common stock 		C - Conversion X -54,451 4,937,669 -1.09
2017-01-06 2017-01-04 4 PLNT Planet Fitness, Inc.
Class A Common Stock 		S - Sale X -54,451 0 -100.00 20.24 -1,102,203
2017-01-06 2017-01-04 4 PLNT Planet Fitness, Inc.
Class A Common Stock 		C - Conversion X 54,451 54,451
2017-01-05 2017-01-03 4 PLNT Planet Fitness, Inc.
Holding Units and Class B common stock 		C - Conversion X -75,197 4,992,120 -1.48
2017-01-05 2017-01-03 4 PLNT Planet Fitness, Inc.
Class A Common Stock 		S - Sale X -75,197 0 -100.00 20.08 -1,510,016
2017-01-05 2017-01-03 4 PLNT Planet Fitness, Inc.
Class A Common Stock 		C - Conversion X 75,197 75,197
2017-01-04 2016-12-30 4 PLNT Planet Fitness, Inc.
Holding Units and Class B common stock 		C - Conversion X -60,669 5,067,317 -1.18
2017-01-04 2016-12-30 4 PLNT Planet Fitness, Inc.
Class A Common Stock 		S - Sale X -60,669 0 -100.00 20.06 -1,217,099
2017-01-04 2016-12-30 4 PLNT Planet Fitness, Inc.
Class A Common Stock 		C - Conversion X 60,669 60,669
2017-01-03 2016-12-29 4 PLNT Planet Fitness, Inc.
Holding Units and Class B common stock 		C - Conversion X -31,925 5,127,986 -0.62
2017-01-03 2016-12-29 4 PLNT Planet Fitness, Inc.
Class A Common Stock 		S - Sale X -31,925 0 -100.00 20.01 -638,870
2017-01-03 2016-12-29 4 PLNT Planet Fitness, Inc.
Class A Common Stock 		C - Conversion X 31,925 31,925
2016-12-29 2016-12-27 4 PLNT Planet Fitness, Inc.
Holding Units and Class B common stock 		C - Conversion X -887 5,159,911 -0.02
2016-12-29 2016-12-27 4 PLNT Planet Fitness, Inc.
Class A Common Stock 		S - Sale X -887 0 -100.00 20.01 -17,745
2016-12-29 2016-12-27 4 PLNT Planet Fitness, Inc.
Class A Common Stock 		C - Conversion X 887 887
2016-12-27 2016-12-22 4 PLNT Planet Fitness, Inc.
Holding Units and Class B common stock 		C - Conversion X -400 5,160,798 -0.01
2016-12-27 2016-12-22 4 PLNT Planet Fitness, Inc.
Class A Common Stock 		S - Sale X -400 0 -100.00 20.03 -8,012
2016-12-27 2016-12-22 4 PLNT Planet Fitness, Inc.
Class A Common Stock 		C - Conversion X 400 400
2016-12-23 2016-12-21 4 PLNT Planet Fitness, Inc.
Holding Units and Class B common stock 		C - Conversion X -101,296 5,161,198 -1.92
2016-12-23 2016-12-21 4 PLNT Planet Fitness, Inc.
Class A Common Stock 		S - Sale X -101,296 0 -100.00 20.15 -2,041,114
2016-12-23 2016-12-21 4 PLNT Planet Fitness, Inc.
Class A Common Stock 		C - Conversion X 101,296 101,296
2016-12-22 2016-12-20 4 PLNT Planet Fitness, Inc.
Holding Units and Class B common stock 		C - Conversion X -48,349 5,262,494 -0.91
2016-12-22 2016-12-20 4 PLNT Planet Fitness, Inc.
Class A Common Stock 		S - Sale X -48,349 0 -100.00 20.69 -1,000,447
2016-12-22 2016-12-20 4 PLNT Planet Fitness, Inc.
Class A Common Stock 		C - Conversion X 48,349 48,349
2016-12-21 2016-12-19 4 PLNT Planet Fitness, Inc.
Holding Units and Class B common stock 		C - Conversion X -56,852 5,310,843 -1.06
2016-12-21 2016-12-19 4 PLNT Planet Fitness, Inc.
Class A Common Stock 		S - Sale X -56,852 0 -100.00 20.77 -1,180,742
2016-12-21 2016-12-19 4 PLNT Planet Fitness, Inc.
Class A Common Stock 		C - Conversion X 56,852 56,852
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)