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
2021-02-17 GAMCO INVESTORS, INC. ET AL 10%-Owner Sell 1,000 $28.48 $28,480 No
2020-12-03 MALONE JOHN C Chairman of the Board Sell 60,302 $41.52 $2,503,582 No
2020-12-02 MALONE JOHN C Chairman of the Board Sell 104,571 $41.31 $4,319,638 No
2020-11-30 MALONE JOHN C Chairman of the Board Sell 65,935 $41.52 $2,737,305 No
2020-11-25 MALONE JOHN C Chairman of the Board Sell 143,884 $42.22 $6,075,021 No
2020-11-23 MALONE JOHN C Chairman of the Board Sell 360,724 $39.01 $14,073,561 No
2020-11-19 MALONE JOHN C Chairman of the Board Sell 349,584 $39.12 $13,675,525 No
2020-08-13 RAPLEY DAVID E Director Sell 2,021 $36.10 $72,958 No
2020-07-21 GAMCO INVESTORS, INC. ET AL 10%-Owner Buy 600 $19.58 $11,751 No
2020-07-15 GAMCO INVESTORS, INC. ET AL 10%-Owner Buy 7,694 $18.27 $140,552 No
2020-06-18 MALONE JOHN C Chairman of the Board Sell 500,000 $36.21 $18,104,167 No
2020-06-05 Ancient Art, L.P. 10%-Owner Sell 50,000 $35.84 $1,791,930 No
2020-06-03 Ancient Art, L.P. 10%-Owner Sell 7,304 $35.69 $260,697 No
2020-06-01 WESCHLER, R. TED Member of 10% owner group Buy 450,000 $37.35 $16,807,500 No
2020-06-01 BERKSHIRE HATHAWAY INC 10%-Owner Buy 450,000 $37.35 $16,807,500 No
2020-05-29 WESCHLER, R. TED Member of 10% owner group Buy 2,374,180 $36.15 $85,824,685 Yes
2020-05-29 BERKSHIRE HATHAWAY INC 10%-Owner Buy 2,374,180 $36.15 $85,824,685 Yes
2020-05-26 WESCHLER, R. TED Member of 10% owner group Buy 2,016,950 $32.56 $65,678,861 Yes
2020-05-26 BERKSHIRE HATHAWAY INC 10%-Owner Buy 2,016,950 $32.56 $65,678,861 Yes
2020-03-18 GAMCO INVESTORS, INC. ET AL 10%-Owner Buy 4,000 $15.50 $62,000 No
2020-03-10 Gilchrist Malcolm Ian Grant Director Sell 1,484 $33.86 $50,243 No
2020-03-11 GAMCO INVESTORS, INC. ET AL 10%-Owner Buy 1,000 $20.21 $20,210 No
2020-01-24 GAMCO INVESTORS, INC. ET AL 10%-Owner Buy 1,200 $29.55 $35,460 No
2020-01-22 GAMCO INVESTORS, INC. ET AL 10%-Owner Buy 1,000 $29.25 $29,250 No
2019-12-30 GAMCO INVESTORS, INC. ET AL 10%-Owner Buy 8,006 $28.85 $230,978 No
2019-12-12 MAFFEI GREGORY B President, CEO Sell 147,577 $47.70 $7,040,072 No
2019-12-11 ROSENTHALER ALBERT E Chief Corp. Dev. Officer Sell 21,664 $46.72 $1,012,202 No
2019-12-11 MAFFEI GREGORY B President, CEO Sell 201,550 $47.32 $9,537,137 No
2019-12-09 MAFFEI GREGORY B President, CEO Sell 286,152 $47.25 $13,521,428 No
2019-12-05 MAFFEI GREGORY B President, CEO Sell 480,011 $46.21 $22,183,253 No

Insider Smart

ROYAL CARIBBEAN CRUISES (RCL) - Thompson Donald, Director of RCL feels safe and made a move. The only insiders bought RCL post crash.

Insider Smart

SIMON PROPERTY GROUP (SPG) - Bottom fishing the crash could be intimidating, but it can be easier if you know insiders are on your side. Aeppel Glyn, Director of SPG played safe and bought shares in May at $50, but it is not late at all, the stock is now $90.