Why insider trading matters?

Numerous studies have examined whether there is evidence that U.S. insiders systematically trade on private information despite the legal deterrence. The consensus appears to be that insider purchases (but not sales) tend to be followed by positive abnormal stock price performance, particularly for small growth stocks.

- Prof. B. Espen Eckbo, Dartmouth College
The Liberty SiriusXM Group (LSXMA)
Sector: Communication Services; Industry: Broadcasting

Formula One Group operates in the motorsports business. Formula One Group operates as a subsidiary of Liberty Media Corporation.


Trade Date Insider Title Buy/Sell #Shares Price Value Option
2022-05-11 GAMCO INVESTORS, INC. ET AL 10%-Owner Buy 1,000 $25.55 $25,550 No
2022-04-25 GAMCO INVESTORS, INC. ET AL 10%-Owner Buy 6,000 $27.17 $163,028 No
2022-04-21 GAMCO INVESTORS, INC. ET AL 10%-Owner Buy 3,000 $27.96 $83,880 No
2022-04-01 GAMCO INVESTORS, INC. ET AL 10%-Owner Buy 4,500 $28.96 $130,328 No
2022-03-15 GAMCO INVESTORS, INC. ET AL 10%-Owner Buy 5,000 $26.75 $133,760 No
2022-01-21 GAMCO INVESTORS, INC. ET AL 10%-Owner Buy 2,000 $26.24 $52,489 No
2022-01-04 GAMCO INVESTORS, INC. ET AL 10%-Owner Buy 2,500 $28.60 $71,491 No
2021-12-31 MAFFEI GREGORY B President, CEO Sell 141,988 $62.63 $8,892,476 No
2021-12-23 MAFFEI GREGORY B President, CEO Sell 100,000 $61.26 $6,126,387 No
2021-11-01 WESCHLER, R. TED Member of 10% owner group Buy 5,347,320 $50.02 $267,449,418 No
2021-05-12 RAPLEY DAVID E Director Sell 1,200 $41.92 $50,307 No
2020-11-23 MALONE JOHN C Chairman of the Board Sell 360,724 $39.01 $14,073,561 No
2020-08-13 RAPLEY DAVID E Director Sell 2,021 $36.10 $72,958 No
2020-06-18 MALONE JOHN C Chairman of the Board Sell 500,000 $36.21 $18,104,167 No
2022-01-21 GAMCO INVESTORS, INC. ET AL 10%-Owner Buy 2,000 $26.24 $52,489 No
2022-01-20 GAMCO INVESTORS, INC. ET AL 10%-Owner Buy 1,000 $26.15 $26,150 No
2022-01-04 GAMCO INVESTORS, INC. ET AL 10%-Owner Buy 2,500 $28.60 $71,491 No
2021-12-28 MAFFEI GREGORY B President, CEO Sell 100,000 $61.75 $6,175,364 No
2021-12-28 GAMCO INVESTORS, INC. ET AL 10%-Owner Buy 500 $28.63 $14,315 No
2021-12-23 GAMCO INVESTORS, INC. ET AL 10%-Owner Buy 500 $28.71 $14,357 No
2021-12-08 Gilchrist Malcolm Ian Grant Director Sell 3,769 $54.43 $205,138 Yes
2021-12-02 MALONE JOHN C Chairman of the Board Sell 399,000 $50.30 $20,068,668 No
2021-11-09 RAPLEY DAVID E Director Sell 3,872 $53.61 $207,585 Yes
2021-11-01 BERKSHIRE HATHAWAY INC 10%-Owner Buy 5,347,320 $50.02 $267,449,418 No
2021-11-01 WESCHLER, R. TED Member of 10% owner group Buy 5,347,320 $50.02 $267,449,418 No
2021-08-31 ROSENTHALER ALBERT E Chief Corp. Dev. Officer Sell 11,816 $25.77 $304,520 Yes
2021-08-30 Wendling Brian J CAO/PFO Sell 12,215 $49.59 $605,784 Yes
2021-08-18 Wendling Brian J CAO/PFO Sell 11,405 $48.00 $547,440 Yes
2021-07-02 GAMCO INVESTORS, INC. ET AL 10%-Owner Buy 100 $27.92 $2,792 No
2021-06-04 MALONE JOHN C Chairman of the Board Sell 51,500 $44.13 $2,272,700 No

Insider Smart

Delta Airlines (DAL) - From an insider's perspective: airlines are the first ones to go under due to the pandemic. A lot of concerns were raised on possible bankruptcy especially amid by the dump from Buffett. However, insiders of Delta were bold enough to buy when Buffett was fear. And Delta is the only airline bought by insiders post-Buffett-dump.

Insider Smart

Mohawk Group Holdings, Inc. (MWK) - Multiple insiders bought MWK in June around $5, stock moved sideways for a month then made a 60% jump in 10 days. Patience is the key.