William R Tiefel

Insider

First SEC filing: July 2, 2010 · Latest: July 2, 2010

On this page

Insider at Companies where this person is a reporting insider.
Insider transactions Every share this person bought or sold, from Form 4 filings.
Derivatives Options and other derivative holdings reported by this person.

Insider at

KMX selling Nov. 3, 2017

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 51 non-open-market transactions below last 12 months, based on the transactions shown below

Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted

51 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
Jan. 16, 2019	KMX	M	4,897	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
Jan. 16, 2019	KMX	M	4,897	$25.12	$123,013	162,567 Direct	+3.11%	Acquired	145.2% (price as of 2026-08-21)
June 29, 2018	KMX	A	2,390	—	—	157,670 Direct	+1.54%	Acquired	(price as of 2026-08-21)
April 11, 2018	KMX	M	3,621	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
April 11, 2018	KMX	M	3,621	$33.11	$119,891	155,280 Direct	+2.39%	Acquired	86.0% (price as of 2026-08-21)
Nov. 3, 2017	KMX	S	13,000	$75.30	$978,900	151,659 Direct	-7.90%	Disposed	-18.2% (price as of 2026-08-21)
Oct. 3, 2017	KMX	S	23,000	$76.39	$1,756,970	164,659 Direct	-12.26%	Disposed	-19.4% (price as of 2026-08-21)
July 1, 2016	KMX	A	2,810	—	—	185,253 Direct	+1.54%	Acquired	(price as of 2026-08-21)
Sept. 25, 2015	KMX	M	5,787	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
Sept. 25, 2015	KMX	M	7,610	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
Sept. 25, 2015	KMX	M	5,787	$19.98	$115,624	182,443 Direct	+3.28%	Acquired	208.3% (price as of 2026-08-21)
Sept. 25, 2015	KMX	M	7,610	$14.49	$110,269	176,656 Direct	+4.50%	Acquired	325.1% (price as of 2026-08-21)
June 25, 2015	KMX	A	1,907	—	—	169,046 Direct	+1.14%	Acquired	(price as of 2026-08-21)
June 26, 2014	KMX	A	2,540	—	—	167,139 Direct	+1.54%	Acquired	(price as of 2026-08-21)
Jan. 3, 2014	KMX	M	9,091	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
Jan. 3, 2014	KMX	M	9,091	$14.86	$135,092	164,599 Direct	+5.85%	Acquired	314.5% (price as of 2026-08-21)
Dec. 26, 2013	KMX	M	5,285	$25.67	$135,666	155,508 Direct	+3.52%	Acquired	140.0% (price as of 2026-08-21)
Dec. 26, 2013	KMX	M	5,285	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
June 27, 2013	KMX	A	1,071	—	—	150,223 Direct	+0.72%	Acquired	(price as of 2026-08-21)
June 27, 2013	KMX	A	2,870	—	—	2,870 Direct	—	Acquired	(price as of 2026-08-21)
Dec. 24, 2012	KMX	M	6,804	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
Dec. 24, 2012	KMX	M	7,598	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
Dec. 24, 2012	KMX	M	6,804	$17.44	$118,662	149,152 Direct	+4.78%	Acquired	253.2% (price as of 2026-08-21)
Dec. 24, 2012	KMX	M	7,598	$13.19	$100,218	142,348 Direct	+5.64%	Acquired	367.0% (price as of 2026-08-21)
June 28, 2012	KMX	A	1,990	—	—	134,750 Direct	+1.50%	Acquired	(price as of 2026-08-21)
June 28, 2012	KMX	A	4,897	—	—	4,897 Direct	—	Acquired	(price as of 2026-08-21)
April 11, 2012	KMX	M	8,006	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
April 11, 2012	KMX	M	8,006	$10.75	$86,064	132,760 Direct	+6.42%	Acquired	473.0% (price as of 2026-08-21)
June 30, 2011	KMX	A	3,621	—	—	3,621 Direct	—	Acquired	(price as of 2026-08-21)
June 30, 2011	KMX	A	1,510	—	—	124,754 Direct	+1.23%	Acquired	(price as of 2026-08-21)
April 6, 2011	KMX	M	5,750	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
April 6, 2011	KMX	M	5,750	$14.19	$81,592	123,244 Direct	+4.89%	Acquired	334.1% (price as of 2026-08-21)
July 1, 2010	KMX	A	5,787	—	—	5,787 Direct	—	Acquired	(price as of 2026-08-21)
July 1, 2010	KMX	A	2,503	—	—	117,494 Direct	+2.18%	Acquired	(price as of 2026-08-21)
May 7, 2010	KMX	M	11,470	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
May 7, 2010	KMX	M	11,470	$7.02	$80,519	114,991 Direct	+11.08%	Acquired	777.5% (price as of 2026-08-21)
June 26, 2009	KMX	A	7,610	—	—	7,610 Direct	—	Acquired	(price as of 2026-08-21)
June 26, 2009	KMX	A	3,451	—	—	103,521 Direct	+3.45%	Acquired	(price as of 2026-08-21)
June 27, 2008	KMX	A	9,091	—	—	9,091 Direct	—	Acquired	(price as of 2026-08-21)
June 27, 2008	KMX	A	3,365	—	—	100,070 Direct	+3.48%	Acquired	(price as of 2026-08-21)
Dec. 26, 2007	KMX	P	20,000	$19.10	$382,000	96,705 Direct	+26.07%	Acquired	222.5% (price as of 2026-08-21)
Oct. 15, 2007	KMX	P	20,000	$21.30	$426,000	76,705 Direct	+35.27%	Acquired	189.2% (price as of 2026-08-21)
June 29, 2007	KMX	A	5,285	—	—	5,285 Direct	—	Acquired	(price as of 2026-08-21)
June 29, 2007	KMX	A	1,169	—	—	56,705 Direct	+2.10%	Acquired	(price as of 2026-08-21)
April 2, 2007	KMX	P	20,000	$24.78	$495,600	55,536 Direct	+56.28%	Acquired	148.6% (price as of 2026-08-21)
Jan. 11, 2007	KMX	P	5,000	$55.98	$279,900	17,768 Direct	+39.16%	Acquired	120.1% (price as of 2026-08-21)
June 21, 2006	KMX	A	3,402	—	—	3,402 Direct	—	Acquired	(price as of 2026-08-21)
June 21, 2006	KMX	A	860	$34.88	$29,997	12,768 Direct	+7.22%	Acquired	253.2% (price as of 2026-08-21)
June 24, 2005	KMX	A	3,799	—	—	3,799 Direct	—	Acquired	(price as of 2026-08-21)
June 23, 2005	KMX	A	3,709	—	—	3,709 Direct	—	Acquired	(price as of 2026-08-21)
June 23, 2005	KMX	A	379	$26.38	$9,998	11,908 Direct	+3.29%	Acquired	367.0% (price as of 2026-08-21)
May 11, 2005	KMX	A	1,300	—	—	4,003 Direct	+48.09%	Acquired	(price as of 2026-08-21)
May 11, 2005	KMX	D	1,300	—	—	2,703 Direct	-32.48%	Disposed	(price as of 2026-08-21)
June 30, 2004	KMX	A	21	$21.49	$451	21 Direct	—	Acquired	473.3% (price as of 2026-08-21)
June 30, 2004	KMX	A	465	$21.49	$9,993	11,529 Direct	+4.20%	Acquired	473.3% (price as of 2026-08-21)
June 30, 2004	KMX	A	465	$21.49	$9,993	11,529 Direct	+4.20%	Acquired	473.3% (price as of 2026-08-21)
June 30, 2004	KMX	A	21	$21.49	$451	21 Direct	—	Acquired	473.3% (price as of 2026-08-21)
June 25, 2004	KMX	P	5,000	$21.09	$105,450	11,064 Direct	+82.45%	Acquired	484.1% (price as of 2026-08-21)
Jan. 12, 2004	KMX	P	2,000	$29.71	$59,420	6,064 Direct	+49.21%	Acquired	314.7% (price as of 2026-08-21)
Dec. 18, 2003	KMX	P	1,000	$31.19	$31,190	4,064 Direct	+32.64%	Acquired	295.0% (price as of 2026-08-21)
Oct. 20, 2003	KMX	P	1,000	$32.20	$32,200	3,064 Direct	+48.45%	Acquired	282.6% (price as of 2026-08-21)

P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding

Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.

Derivative holdings (Form 4 Table II)

Options, RSUs and convertible securities reported on Form 4 Table II.

Date	Ticker	Security	Underlying	Exercise price	Expiration	Shares	A/D
Jan. 16, 2019	KMX	Stock Options (Right to Buy)	Common Stock (4,897)	$25.12	June 28, 2019	4,897	Disposed
April 11, 2018	KMX	Stock Options (Right to Buy)	Common Stock (3,621)	$33.11	June 30, 2018	3,621	Disposed
Sept. 25, 2015	KMX	Stock Options (Right to Buy)	Common Stock (5,787)	$19.98	July 1, 2017	5,787	Disposed
Sept. 25, 2015	KMX	Stock Options (Right to Buy)	Common Stock (7,610)	$14.49	June 26, 2016	7,610	Disposed
Jan. 3, 2014	KMX	Stock Options (Right to Buy)	Common Stock (9,091)	$14.86	June 27, 2015	9,091	Disposed
Dec. 26, 2013	KMX	Stock Options (Right to Buy)	Common Stock (5,285)	$25.67	June 29, 2014	5,285	Disposed
June 27, 2013	KMX	Stock Options (Right to Buy)	Common Stock (2,870)	$46.65	June 27, 2020	2,870	Acquired
Dec. 24, 2012	KMX	Stock Options (Right to Buy) [F2]	Common Stock (6,804)	$17.44	June 21, 2013	6,804	Disposed
Dec. 24, 2012	KMX	Stock Options (Right to Buy) [F1]	Common Stock (7,598)	$13.19	June 25, 2013	7,598	Disposed
June 28, 2012	KMX	Stock Options (Right to Buy)	Common Stock (4,897)	$25.12	June 28, 2019	4,897	Acquired
April 11, 2012	KMX	Stock Options (Right to Buy) [F1]	Common Stock (8,006)	$10.75	July 1, 2012	8,006	Disposed
June 30, 2011	KMX	Stock Options (Right to Buy)	Common Stock (3,621)	$33.11	June 30, 2018	3,621	Acquired
April 6, 2011	KMX	Stock Options (Right to Buy) [F1]	Common Stock (5,750)	$14.19	June 25, 2011	5,750	Disposed
July 1, 2010	KMX	Stock Options (Right to Buy)	Common Stock (5,787)	$19.98	July 1, 2017	5,787	Acquired
May 7, 2010	KMX	Stock Options (Right to Buy) [F1]	Common Stock (11,470)	$7.02	Oct. 9, 2010	11,470	Disposed
June 26, 2009	KMX	Stock Options (Right to Buy)	Common Stock (7,610)	$14.49	June 26, 2016	7,610	Acquired
June 27, 2008	KMX	Stock Options (Right to Buy)	Common Stock (9,091)	$14.86	June 27, 2015	9,091	Acquired
June 29, 2007	KMX	Stock Options (Right to Buy)	Common Stock (5,285)	$25.67	June 29, 2014	5,285	Acquired
June 21, 2006	KMX	Stock Options (Right to Buy)	Common Stock (3,402)	$34.88	June 21, 2013	3,402	Acquired
June 24, 2005	KMX	Stock Options (Right to buy) [F1]	Common Stock (3,799)	$26.38	June 24, 2013	3,799	Acquired
June 23, 2005	KMX	Stock Options (Right to buy)	Common Stock (3,709)	$26.38	June 23, 2015	3,709	Acquired
May 11, 2005	KMX	Stock Options (Right to buy)	Common Stock (1,300)	$21.49	June 30, 2014	1,300	Acquired
May 11, 2005	KMX	Stock Options (Right to buy)	Common Stock (1,300)	$21.49	June 30, 2014	1,300	Disposed
June 30, 2004	KMX	Stock Options (Right to buy)	Common Stock (21)	$21.49	June 30, 2014	21	Acquired
June 30, 2004	KMX	Stock Options (Right to buy)	Common Stock (21)	$21.49	June 30, 2014	21	Acquired

Exercise/conversion price is blank when not applicable (e.g. RSUs).