Michael C Armstrong

Insider

First SEC filing: Nov. 21, 2006 · Latest: Nov. 21, 2006

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.
Initial holdings The stakes this person held when they first started reporting.

Insider at

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 84 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

84 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
Jan. 19, 2010	C	A	42,662	—	—	288,922 Direct	+17.32%	Acquired	(price as of 2026-08-20)
July 24, 2009	C	A	202,423	—	—	246,260 Direct	+461.76%	Acquired	(price as of 2026-08-20)
July 24, 2009	C	D	27,700	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
April 1, 2009	C	A	289	$1.31	$379	43,837 Direct	+0.66%	Acquired	907.5% (price as of 2026-08-20)
April 1, 2009	C	A	904	$1.31	$1,184	119,185 Indirect	+0.76%	Acquired	907.5% (price as of 2026-08-20)
Jan. 14, 2009	C	A	32,106	—	—	45,614 Direct	+237.68%	Acquired	(price as of 2026-08-20)
Oct. 17, 2008	C	P	27,700	$17.75	$491,675	27,700 Direct	—	Acquired	-25.6% (price as of 2026-08-20)
Jan. 22, 2008	C	A	5,697	—	—	13,508 Direct	+72.94%	Acquired	(price as of 2026-08-20)
Jan. 16, 2007	C	A	2,758	—	—	2,758 Direct	—	Acquired	(price as of 2026-08-20)
Jan. 16, 2007	C	A	2,066	—	—	12,746 Direct	+19.34%	Acquired	(price as of 2026-08-20)
Jan. 1, 2007	C	A	47	$51.38	$2,415	10,680 Direct	+0.44%	Acquired	-74.3% (price as of 2026-08-20)
Jan. 1, 2007	C	A	294	$51.38	$15,106	111,280 Indirect	+0.26%	Acquired	-74.3% (price as of 2026-08-20)
Jan. 1, 2007	C	A	757	$51.38	$38,895	110,986 Indirect	+0.69%	Acquired	-74.3% (price as of 2026-08-20)
Jan. 1, 2007	C	A	444	$51.38	$22,813	110,229 Indirect	+0.40%	Acquired	-74.3% (price as of 2026-08-20)
Nov. 17, 2006	HCA	D	5,715	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Nov. 17, 2006	HCA	D	3,833	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Nov. 17, 2006	HCA	D	6,229	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Nov. 17, 2006	HCA	D	2,774	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Nov. 17, 2006	HCA	D	12,163	$51.00	$620,313	0 Direct	-100.00%	Disposed	704.7% (price as of 2026-08-20)
Oct. 1, 2006	C	A	49	$49.09	$2,405	10,633 Direct	+0.46%	Acquired	-73.1% (price as of 2026-08-20)
Oct. 1, 2006	C	A	305	$49.09	$14,972	109,785 Indirect	+0.28%	Acquired	-73.1% (price as of 2026-08-20)
Oct. 1, 2006	C	A	781	$49.09	$38,339	109,480 Indirect	+0.72%	Acquired	-73.1% (price as of 2026-08-20)
Oct. 1, 2006	C	A	465	$49.09	$22,827	108,699 Indirect	+0.43%	Acquired	-73.1% (price as of 2026-08-20)
July 1, 2006	C	A	48	$49.44	$2,373	10,585 Direct	+0.46%	Acquired	-73.3% (price as of 2026-08-20)
July 1, 2006	C	A	300	$49.44	$14,832	108,235 Indirect	+0.28%	Acquired	-73.3% (price as of 2026-08-20)
July 1, 2006	C	A	763	$49.44	$37,723	107,935 Indirect	+0.71%	Acquired	-73.3% (price as of 2026-08-20)
July 1, 2006	C	A	462	$49.44	$22,841	107,172 Indirect	+0.43%	Acquired	-73.3% (price as of 2026-08-20)
May 25, 2006	HCA	A	3,833	—	—	3,833 Direct	—	Acquired	(price as of 2026-08-20)
May 25, 2006	HCA	A	3,105	—	—	12,163 Direct	+34.28%	Acquired	(price as of 2026-08-20)
April 1, 2006	C	J	50	$46.52	$2,326	10,537 Direct	+0.48%	Acquired	-71.6% (price as of 2026-08-20)
April 1, 2006	C	J	315	$46.52	$14,654	106,711 Indirect	+0.30%	Acquired	-71.6% (price as of 2026-08-20)
April 1, 2006	C	J	797	$46.52	$37,076	106,396 Indirect	+0.75%	Acquired	-71.6% (price as of 2026-08-20)
April 1, 2006	C	A	490	$46.52	$22,795	105,599 Indirect	+0.47%	Acquired	-71.6% (price as of 2026-08-20)
Jan. 17, 2006	C	A	4,599	—	—	4,599 Direct	—	Acquired	(price as of 2026-08-20)
Jan. 17, 2006	C	A	2,307	—	—	10,487 Direct	+28.20%	Acquired	(price as of 2026-08-20)
Jan. 1, 2006	C	J	22	$48.92	$1,076	8,180 Direct	+0.27%	Acquired	-73.0% (price as of 2026-08-20)
Jan. 1, 2006	C	J	266	$48.92	$13,013	105,109 Indirect	+0.25%	Acquired	-73.0% (price as of 2026-08-20)
Jan. 1, 2006	C	J	670	$48.92	$32,776	104,842 Indirect	+0.64%	Acquired	-73.0% (price as of 2026-08-20)
Jan. 1, 2006	C	A	466	$48.92	$22,797	104,172 Indirect	+0.45%	Acquired	-73.0% (price as of 2026-08-20)
Oct. 1, 2005	C	J	24	$44.55	$1,069	8,158 Direct	+0.30%	Acquired	-70.4% (price as of 2026-08-20)
Oct. 1, 2005	C	J	289	$44.55	$12,875	103,706 Indirect	+0.28%	Acquired	-70.4% (price as of 2026-08-20)
Oct. 1, 2005	C	J	723	$44.55	$32,210	103,417 Indirect	+0.70%	Acquired	-70.4% (price as of 2026-08-20)
Oct. 1, 2005	C	A	512	$44.55	$22,810	102,694 Indirect	+0.50%	Acquired	-70.4% (price as of 2026-08-20)
July 1, 2005	C	J	665	$47.64	$31,681	101,914 Indirect	+0.66%	Acquired	-72.3% (price as of 2026-08-20)
July 1, 2005	C	A	479	$47.64	$22,820	101,249 Indirect	+0.48%	Acquired	-72.3% (price as of 2026-08-20)
July 1, 2005	C	J	22	$47.64	$1,048	8,135 Direct	+0.27%	Acquired	-72.3% (price as of 2026-08-20)
July 1, 2005	C	J	268	$47.64	$12,768	102,182 Indirect	+0.26%	Acquired	-72.3% (price as of 2026-08-20)
June 9, 2005	HCA	A	5,715	—	—	5,715 Direct	—	Acquired	(price as of 2026-08-20)
June 9, 2005	HCA	A	1,394	—	—	9,058 Direct	+18.19%	Acquired	(price as of 2026-08-20)
April 1, 2005	C	J	22	$48.14	$1,059	8,113 Direct	+0.27%	Acquired	-72.6% (price as of 2026-08-20)
April 1, 2005	C	J	263	$48.14	$12,661	100,770 Indirect	+0.26%	Acquired	-72.6% (price as of 2026-08-20)
April 1, 2005	C	J	648	$48.14	$31,195	100,507 Indirect	+0.65%	Acquired	-72.6% (price as of 2026-08-20)
April 1, 2005	C	A	474	$48.14	$22,818	99,860 Indirect	+0.48%	Acquired	-72.6% (price as of 2026-08-20)
Jan. 18, 2005	C	A	4,737	—	—	4,737 Direct	—	Acquired	(price as of 2026-08-20)
Jan. 18, 2005	C	A	2,346	—	—	8,091 Direct	+40.84%	Acquired	(price as of 2026-08-20)
Jan. 1, 2005	C	A	812	$46.18	$37,498	98,538 Indirect	+0.83%	Acquired	-71.4% (price as of 2026-08-20)
Jan. 1, 2005	C	J	601	$46.18	$27,754	99,139 Indirect	+0.61%	Acquired	-71.4% (price as of 2026-08-20)
Jan. 1, 2005	C	J	247	$46.18	$11,406	99,386 Indirect	+0.25%	Acquired	-71.4% (price as of 2026-08-20)
Nov. 5, 2004	CCZ	A	7,500	—	—	7,500 Direct	—	Acquired	(price as of 2026-08-20)
Oct. 1, 2004	C	J	240	$46.97	$11,273	97,726 Indirect	+0.25%	Acquired	-71.9% (price as of 2026-08-20)
Oct. 1, 2004	C	J	579	$46.97	$27,196	97,485 Indirect	+0.60%	Acquired	-71.9% (price as of 2026-08-20)
Oct. 1, 2004	C	A	798	$46.97	$37,482	96,906 Indirect	+0.83%	Acquired	-71.9% (price as of 2026-08-20)
Aug. 12, 2004	C	G	150	—	—	5,745 Direct	-2.54%	Disposed	(price as of 2026-08-20)
July 1, 2004	C	J	238	$47.00	$11,186	96,108 Indirect	+0.25%	Acquired	-71.9% (price as of 2026-08-20)
July 1, 2004	C	J	567	$47.00	$26,649	95,870 Indirect	+0.59%	Acquired	-71.9% (price as of 2026-08-20)
July 1, 2004	C	A	798	$47.00	$37,506	95,303 Indirect	+0.84%	Acquired	-71.9% (price as of 2026-08-20)
June 10, 2004	HCA	A	6,229	—	—	6,229 Direct	—	Acquired	(price as of 2026-08-20)
June 10, 2004	HCA	A	1,900	—	—	7,664 Direct	+32.96%	Acquired	(price as of 2026-08-20)
May 26, 2004	CCZ	A	3,750	—	—	3,750 Direct	—	Acquired	(price as of 2026-08-20)
May 25, 2004	CCZ	M	110,255	—	—	542,510 Direct	+25.51%	Acquired	(price as of 2026-08-20)
May 25, 2004	CCZ	D	110,255	$29.57	$3,260,240	432,255 Direct	-20.32%	Disposed	124.7% (price as of 2026-08-20)
May 25, 2004	CCZ	M	110,255	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
April 1, 2004	C	J	224	$49.64	$11,119	94,505 Indirect	+0.24%	Acquired	-73.4% (price as of 2026-08-20)
April 1, 2004	C	J	526	$49.64	$26,111	94,281 Indirect	+0.56%	Acquired	-73.4% (price as of 2026-08-20)
April 1, 2004	C	A	756	$49.64	$37,528	93,755 Indirect	+0.81%	Acquired	-73.4% (price as of 2026-08-20)
Jan. 29, 2004	HCA	A	2,774	—	—	2,774 Direct	—	Acquired	(price as of 2026-08-20)
Jan. 29, 2004	HCA	A	5,764	—	—	5,764 Direct	—	Acquired	(price as of 2026-08-20)
Jan. 20, 2004	C	A	2,500	—	—	2,500 Direct	—	Acquired	(price as of 2026-08-20)
Jan. 20, 2004	C	A	2,500	—	—	2,500 Direct	—	Acquired	(price as of 2026-08-20)
Jan. 1, 2004	C	J	204	$47.24	$9,637	92,999 Indirect	+0.22%	Acquired	-72.1% (price as of 2026-08-20)
Jan. 1, 2004	C	J	475	$47.24	$22,439	92,795 Indirect	+0.51%	Acquired	-72.1% (price as of 2026-08-20)
Jan. 1, 2004	C	A	794	$47.24	$37,509	92,320 Indirect	+0.87%	Acquired	-72.1% (price as of 2026-08-20)
Oct. 1, 2003	C	J	216	$44.28	$9,564	91,527 Indirect	+0.24%	Acquired	-70.2% (price as of 2026-08-20)
Oct. 1, 2003	C	J	496	$44.28	$21,963	91,311 Indirect	+0.55%	Acquired	-70.2% (price as of 2026-08-20)
Oct. 1, 2003	C	A	790	$44.28	$34,981	90,814 Indirect	+0.88%	Acquired	-70.2% (price as of 2026-08-20)

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, 2007	C	Employee Stock Options (Right to Buy)	Common Stock (2,758)	$54.38	Jan. 16, 2013	2,758	Acquired
Nov. 17, 2006	HCA	Non-Qualified Stock Option (right-to-buy)	Common Stock (5,715)	$54.68	June 9, 2015	5,715	Disposed
Nov. 17, 2006	HCA	Non-Qualified Stock Option (right to buy)	Common Stock (3,833)	$43.49	May 25, 2016	3,833	Disposed
Nov. 17, 2006	HCA	Non-Qualified Stock Option (right to buy)	Common Stock (6,229)	$40.14	June 10, 2014	6,229	Disposed
Nov. 17, 2006	HCA	Non-Qualified Stock Option (right to buy)	Common Stock (2,774)	$45.86	Jan. 29, 2014	2,774	Disposed
May 25, 2006	HCA	Non-Qualified Stock Option (right to buy)	Common Stock (3,833)	$43.49	May 25, 2016	3,833	Acquired
Jan. 17, 2006	C	Employee Stock Options (Right to Buy)	Common Stock (4,599)	$48.92	Jan. 17, 2012	4,599	Acquired
June 9, 2005	HCA	Non-Qualified Stock Option (right-to-buy)	Common Stock (5,715)	$54.68	June 9, 2015	5,715	Acquired
Jan. 18, 2005	C	Employee Stock Options (Right to Buy)	Common Stock (4,737)	$47.50	Jan. 18, 2011	4,737	Acquired
Nov. 5, 2004	CCZ	Option to Purchase Class A Common Stock	Class A Common Stock (7,500)	$29.69	Nov. 5, 2014	7,500	Acquired
June 10, 2004	HCA	Non-Qualified Stock Option (right to buy)	Common Stock (6,229)	$40.14	June 10, 2014	6,229	Acquired
May 26, 2004	CCZ	Option to Purchase [F1]	Class A Common Stock (3,750)	$29.69	May 26, 2014	3,750	Acquired
May 25, 2004	CCZ	Phantom Stock	Class A Common Stock (110,255)	—	May 25, 2004	110,255	Disposed
Jan. 29, 2004	HCA	Non-Qualified Stock Option (right to buy)	Common Stock (2,774)	$45.86	Jan. 29, 2014	2,774	Acquired
Jan. 20, 2004	C	Employee Stock Options (Right to Buy)	Common Stock (2,500)	$49.50	Jan. 20, 2010	2,500	Acquired
Jan. 20, 2004	C	Employe Stock Options (Right to Buy)	Common Stock (2,500)	$49.50	Jan. 20, 2010	2,500	Acquired

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

Initial ownership (Form 3) 1 holding

Securities held when first becoming an insider, per SEC Form 3.

Date	Ticker	Security	Shares	Ownership
Jan. 30, 2004	HCA	No Securities Beneficially Owned	0	Direct