Michael Ross Boyce

Insider

First SEC filing: Oct. 9, 2008 · Latest: Oct. 9, 2008

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 + 80 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

80 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
June 1, 2026	AIR	A	1,364	—	—	100,904 Direct	+1.37%	Acquired	(price as of 2026-08-20)
June 1, 2025	AIR	A	2,198	—	—	99,540 Direct	+2.26%	Acquired	(price as of 2026-08-20)
June 1, 2024	AIR	A	1,901	—	—	97,342 Direct	+1.99%	Acquired	(price as of 2026-08-20)
June 1, 2023	AIR	A	2,426	—	—	95,441 Direct	+2.61%	Acquired	(price as of 2026-08-20)
June 1, 2022	AIR	A	2,574	—	—	93,015 Direct	+2.85%	Acquired	(price as of 2026-08-20)
July 28, 2021	AIR	P	10,000	$36.11	$361,100	20,000 Indirect	+100.00%	Acquired	277.6% (price as of 2026-08-20)
June 1, 2021	AIR	A	2,937	—	—	90,441 Direct	+3.36%	Acquired	(price as of 2026-08-20)
April 27, 2021	SCL	A	760	—	—	15,261 Direct	+5.24%	Acquired	(price as of 2026-08-20)
April 1, 2021	SCL	A	2	$127.11	$254	753 Direct	+0.27%	Acquired	-50.3% (price as of 2026-08-20)
Jan. 4, 2021	SCL	A	1	$119.32	$119	751 Direct	+0.13%	Acquired	-47.1% (price as of 2026-08-20)
Oct. 1, 2020	SCL	A	2	$109.00	$218	750 Direct	+0.27%	Acquired	-42.1% (price as of 2026-08-20)
July 1, 2020	SCL	A	2	$97.10	$194	748 Direct	+0.27%	Acquired	-35.0% (price as of 2026-08-20)
June 1, 2020	AIR	A	5,976	—	—	87,504 Direct	+7.33%	Acquired	(price as of 2026-08-20)
April 21, 2020	SCL	A	1,103	—	—	14,501 Direct	+8.23%	Acquired	(price as of 2026-08-20)
April 1, 2020	SCL	A	3	$88.46	$265	746 Direct	+0.40%	Acquired	-28.6% (price as of 2026-08-20)
Jan. 2, 2020	SCL	A	2	$102.44	$205	743 Direct	+0.27%	Acquired	-38.4% (price as of 2026-08-20)
Oct. 1, 2019	SCL	A	2	$97.06	$194	741 Direct	+0.27%	Acquired	-34.9% (price as of 2026-08-20)
July 1, 2019	SCL	A	2	$91.91	$184	739 Direct	+0.27%	Acquired	-31.3% (price as of 2026-08-20)
June 3, 2019	AIR	A	3,922	—	—	81,528 Direct	+5.05%	Acquired	(price as of 2026-08-20)
April 30, 2019	SCL	A	1,087	—	—	13,398 Direct	+8.83%	Acquired	(price as of 2026-08-20)
April 1, 2019	SCL	A	2	$87.52	$175	737 Direct	+0.27%	Acquired	-27.8% (price as of 2026-08-20)
Jan. 2, 2019	SCL	A	2	$74.00	$148	735 Direct	+0.27%	Acquired	-14.7% (price as of 2026-08-20)
Oct. 1, 2018	SCL	A	2	$87.01	$174	733 Direct	+0.27%	Acquired	-27.4% (price as of 2026-08-20)
July 2, 2018	SCL	A	2	$78.01	$156	731 Direct	+0.27%	Acquired	-19.0% (price as of 2026-08-20)
June 1, 2018	AIR	A	2,648	—	—	77,606 Direct	+3.53%	Acquired	(price as of 2026-08-20)
April 24, 2018	SCL	A	1,157	—	—	12,311 Direct	+10.37%	Acquired	(price as of 2026-08-20)
April 2, 2018	SCL	A	2	$83.18	$166	729 Direct	+0.28%	Acquired	-24.1% (price as of 2026-08-20)
Jan. 3, 2018	SCL	A	2	$78.97	$158	727 Direct	+0.28%	Acquired	-20.0% (price as of 2026-08-20)
Oct. 2, 2017	ECVT	A	21,067	—	—	21,067 Direct	—	Acquired	(price as of 2026-08-20)
Sept. 29, 2017	SCL	A	2	$83.66	$167	725 Direct	+0.28%	Acquired	-24.5% (price as of 2026-08-20)
Aug. 25, 2017	SCL	M	872	$34.33	$29,936	12,026 Direct	+7.82%	Acquired	83.9% (price as of 2026-08-20)
Aug. 25, 2017	SCL	S	872	$77.00	$67,144	11,154 Direct	-7.25%	Disposed	-18.0% (price as of 2026-08-20)
Aug. 25, 2017	SCL	M	872	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
July 3, 2017	SCL	A	2	$87.14	$174	723 Direct	+0.28%	Acquired	-27.5% (price as of 2026-08-20)
June 1, 2017	AIR	A	5,000	—	—	74,958 Direct	+7.15%	Acquired	(price as of 2026-08-20)
April 25, 2017	SCL	A	1,044	—	—	11,154 Direct	+10.33%	Acquired	(price as of 2026-08-20)
April 3, 2017	SCL	A	1	$78.81	$79	721 Direct	+0.14%	Acquired	-19.9% (price as of 2026-08-20)
Jan. 3, 2017	SCL	A	2	$81.48	$163	720 Direct	+0.28%	Acquired	-22.5% (price as of 2026-08-20)
Oct. 3, 2016	SCL	A	2	$72.66	$145	718 Direct	+0.28%	Acquired	-13.1% (price as of 2026-08-20)
July 1, 2016	SCL	A	2	$59.53	$119	716 Direct	+0.28%	Acquired	6.1% (price as of 2026-08-20)
June 1, 2016	AIR	A	5,000	—	—	69,958 Direct	+7.70%	Acquired	(price as of 2026-08-20)
April 26, 2016	SCL	A	1,290	—	—	10,110 Direct	+14.63%	Acquired	(price as of 2026-08-20)
April 1, 2016	SCL	A	3	$55.29	$166	714 Direct	+0.42%	Acquired	14.2% (price as of 2026-08-20)
Jan. 4, 2016	SCL	A	2	$49.69	$99	711 Direct	+0.28%	Acquired	27.1% (price as of 2026-08-20)
Oct. 1, 2015	SCL	A	4	$41.61	$166	709 Direct	+0.57%	Acquired	51.8% (price as of 2026-08-20)
July 1, 2015	SCL	A	2	$54.11	$108	705 Direct	+0.28%	Acquired	16.7% (price as of 2026-08-20)
June 1, 2015	AIR	A	5,000	—	—	64,938 Direct	+8.34%	Acquired	(price as of 2026-08-20)
April 28, 2015	SCL	A	1,632	—	—	8,820 Direct	+22.70%	Acquired	(price as of 2026-08-20)
April 1, 2015	SCL	A	3	$41.66	$125	703 Direct	+0.43%	Acquired	51.6% (price as of 2026-08-20)
Jan. 2, 2015	SCL	A	3	$40.08	$120	700 Direct	+0.43%	Acquired	57.6% (price as of 2026-08-20)
Oct. 1, 2014	SCL	A	3	$44.38	$133	697 Direct	+0.43%	Acquired	42.3% (price as of 2026-08-20)
July 1, 2014	SCL	A	2	$52.86	$106	694 Direct	+0.29%	Acquired	19.5% (price as of 2026-08-20)
June 2, 2014	AIR	A	5,000	—	—	59,938 Direct	+9.10%	Acquired	(price as of 2026-08-20)
April 29, 2014	SCL	A	1,288	—	—	7,188 Direct	+21.83%	Acquired	(price as of 2026-08-20)
April 1, 2014	SCL	A	2	$64.56	$129	692 Direct	+0.29%	Acquired	-2.2% (price as of 2026-08-20)
Jan. 2, 2014	SCL	A	2	$65.63	$131	690 Direct	+0.29%	Acquired	-3.8% (price as of 2026-08-20)
Oct. 1, 2013	SCL	A	1	$57.73	$58	688 Direct	+0.15%	Acquired	9.4% (price as of 2026-08-20)
July 1, 2013	SCL	A	3	$55.61	$167	687 Direct	+0.44%	Acquired	13.6% (price as of 2026-08-20)
June 1, 2013	AIR	A	5,000	—	—	54,938 Direct	+10.01%	Acquired	(price as of 2026-08-20)
May 16, 2013	SCL	P	2,500	$53.57	$133,925	5,900 Direct	+73.53%	Acquired	17.9% (price as of 2026-08-20)
April 30, 2013	SCL	A	1,286	—	—	3,400 Direct	+60.83%	Acquired	(price as of 2026-08-20)
April 1, 2013	SCL	A	1	$63.10	$63	684 Direct	+0.15%	Acquired	0.1% (price as of 2026-08-20)
Jan. 2, 2013	SCL	A	3	$55.54	$167	683 Direct	+0.44%	Acquired	13.7% (price as of 2026-08-20)
Oct. 1, 2012	SCL	A	1	$96.12	$96	340 Direct	+0.29%	Acquired	31.4% (price as of 2026-08-20)
July 2, 2012	SCL	A	1	$94.18	$94	339 Direct	+0.30%	Acquired	34.1% (price as of 2026-08-20)
June 26, 2012	AIR	P	7,500	$11.82	$88,650	49,938 Direct	+17.67%	Acquired	1053.4% (price as of 2026-08-20)
June 1, 2012	AIR	A	5,000	—	—	42,438 Direct	+13.36%	Acquired	(price as of 2026-08-20)
April 24, 2012	SCL	A	635	—	—	1,057 Direct	+150.47%	Acquired	(price as of 2026-08-20)
April 2, 2012	SCL	A	1	$87.80	$88	338 Direct	+0.30%	Acquired	43.8% (price as of 2026-08-20)
Jan. 3, 2012	SCL	A	1	$80.16	$80	337 Direct	+0.30%	Acquired	57.6% (price as of 2026-08-20)
Oct. 3, 2011	SCL	A	1	$67.18	$67	336 Direct	+0.30%	Acquired	88.0% (price as of 2026-08-20)
July 1, 2011	SCL	A	1	$70.90	$71	335 Direct	+0.30%	Acquired	78.1% (price as of 2026-08-20)
June 1, 2011	AIR	A	5,000	—	—	37,309 Direct	+15.48%	Acquired	(price as of 2026-08-20)
May 3, 2011	SCL	A	422	—	—	422 Direct	—	Acquired	(price as of 2026-08-20)
April 1, 2011	SCL	A	1	$72.50	$72	334 Direct	+0.30%	Acquired	74.2% (price as of 2026-08-20)
Feb. 7, 2011	SCL	A	333	$75.02	$24,982	333 Direct	—	Acquired	68.4% (price as of 2026-08-20)
July 13, 2010	AIR	A	4,000	—	—	32,300 Direct	+14.13%	Acquired	(price as of 2026-08-20)
July 13, 2010	AIR	A	4,500	—	—	32,800 Direct	+15.90%	Acquired	(price as of 2026-08-20)
April 20, 2010	SCL	A	436	$68.66	$29,936	436 Direct	—	Acquired	83.9% (price as of 2026-08-20)
July 14, 2009	AIR	A	4,000	—	—	28,300 Direct	+16.46%	Acquired	(price as of 2026-08-20)
Oct. 9, 2008	AIR	P	10,000	$11.77	$117,700	24,300 Direct	+69.93%	Acquired	1058.3% (price as of 2026-08-20)
July 29, 2008	AIR	P	10,000	$17.16	$171,600	10,000 Indirect	—	Acquired	694.5% (price as of 2026-08-20)
July 29, 2008	AIR	P	10,000	$17.16	$171,600	10,000 Indirect	—	Acquired	694.5% (price as of 2026-08-20)
July 29, 2008	AIR	P	4,300	$16.95	$72,885	13,800 Direct	+45.26%	Acquired	704.3% (price as of 2026-08-20)
July 11, 2008	AIR	A	2,500	—	—	10,000 Direct	+33.33%	Acquired	(price as of 2026-08-20)
Oct. 17, 2007	AIR	S	2,000	$32.57	$65,140	11,800 Direct	-14.49%	Disposed	318.6% (price as of 2026-08-20)
July 11, 2007	AIR	A	2,500	—	—	9,500 Direct	+35.71%	Acquired	(price as of 2026-08-20)
July 10, 2006	AIR	A	2,500	—	—	7,000 Direct	+55.56%	Acquired	(price as of 2026-08-20)
Jan. 13, 2006	AIR	P	2,000	$25.23	$50,460	2,000 Direct	—	Acquired	440.4% (price as of 2026-08-20)
Aug. 2, 2005	AIR	A	2,500	—	—	2,500 Direct	—	Acquired	(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
April 1, 2021	SCL	Stock Awards	Common Stock (2)	—	—	2	Acquired
Jan. 4, 2021	SCL	Stock Awards	Common Stock (1)	—	—	1	Acquired
Oct. 1, 2020	SCL	Stock Awards	Common Stock (2)	—	—	2	Acquired
July 1, 2020	SCL	Stock Awards	Common Stock (2)	—	—	2	Acquired
April 1, 2020	SCL	Stock Awards	Common Stock (3)	—	—	3	Acquired
Jan. 2, 2020	SCL	Stock Awards	Common Stock (2)	—	—	2	Acquired
Oct. 1, 2019	SCL	Stock Awards	Common Stock (2)	—	—	2	Acquired
July 1, 2019	SCL	Stock Awards	Common Stock (2)	—	—	2	Acquired
April 1, 2019	SCL	Stock Awards	Common Stock (2)	—	—	2	Acquired
Jan. 2, 2019	SCL	Stock Awards	Common Stock (2)	—	—	2	Acquired
Oct. 1, 2018	SCL	Stock Awards	Common Stock (2)	—	—	2	Acquired
July 2, 2018	SCL	Stock Awards	Common Stock (2)	—	—	2	Acquired
April 2, 2018	SCL	Stock Awards	Common Stock (2)	—	—	2	Acquired
Jan. 3, 2018	SCL	Stock Awards	Common Stock (2)	—	—	2	Acquired
Sept. 29, 2017	SCL	Stock Awards	Common Stock (2)	—	—	2	Acquired
Aug. 25, 2017	SCL	Stock Option (Right to Buy)	Common Stock (872)	$34.33	April 19, 2018	872	Disposed
July 3, 2017	SCL	Stock Awards	Common Stock (2)	—	—	2	Acquired
April 3, 2017	SCL	Stock Awards	Common Stock (1)	—	—	1	Acquired
Jan. 3, 2017	SCL	Stock Awards	Common Stock (2)	—	—	2	Acquired
Oct. 3, 2016	SCL	Stock Awards	Common Stock (2)	—	—	2	Acquired
July 1, 2016	SCL	Stock Awards	Common Stock (2)	—	—	2	Acquired
April 1, 2016	SCL	Stock Awards	Common Stock (3)	—	—	3	Acquired
Jan. 4, 2016	SCL	Stock Awards	Common Stock (2)	—	—	2	Acquired
Oct. 1, 2015	SCL	Stock Awards	Common Stock (4)	—	—	4	Acquired
July 1, 2015	SCL	Stock Awards	Common Stock (2)	—	—	2	Acquired
April 1, 2015	SCL	Stock Awards	Common Stock (3)	—	—	3	Acquired
Jan. 2, 2015	SCL	Stock Awards	Common Stock (3)	—	—	3	Acquired
Oct. 1, 2014	SCL	Stock Awards	Common Stock (3)	—	—	3	Acquired
July 1, 2014	SCL	Stock Awards	Common Stock (2)	—	—	2	Acquired
April 1, 2014	SCL	Stock Awards	Common Stock (2)	—	—	2	Acquired
Jan. 2, 2014	SCL	Stock Awards	Common Stock (2)	—	—	2	Acquired
Oct. 1, 2013	SCL	Stock Awards	Common Stock (1)	—	—	1	Acquired
July 1, 2013	SCL	Stock Awards	Common Stock (3)	—	—	3	Acquired
April 1, 2013	SCL	Stock Awards	Common Stock (1)	—	—	1	Acquired
Jan. 2, 2013	SCL	Stock Awards	Common Stock (3)	—	—	3	Acquired
Oct. 1, 2012	SCL	Stock Awards	Common Stock (1)	—	—	1	Acquired
July 2, 2012	SCL	Stock Awards	Common Stock (1)	—	—	1	Acquired
April 2, 2012	SCL	Stock Awards	Common Stock (1)	—	—	1	Acquired
Jan. 3, 2012	SCL	Stock Awards	Common Stock (1)	—	—	1	Acquired
Oct. 3, 2011	SCL	Stock Awards	Common Stock (1)	—	—	1	Acquired
July 1, 2011	SCL	Stock Awards	Common Stock (1)	—	—	1	Acquired
April 1, 2011	SCL	Stock Awards	Common Stock (1)	—	—	1	Acquired
Feb. 7, 2011	SCL	Stock Awards	Common Stock (333)	—	—	333	Acquired
April 20, 2010	SCL	Stock Option	Common Stock (436)	$68.66	April 19, 2018	436	Acquired

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

Initial ownership (Form 3) 5 holdings

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

Date	Ticker	Security	Shares	Ownership
Sept. 29, 2017	ECVT	Option (Right to Buy)→ Common Stock (95,191)	95,191	Direct
Sept. 29, 2017	ECVT	Option (Right to Buy)→ Common Stock (95,191)	95,191	Direct
Sept. 29, 2017	ECVT	Option (Right to Buy)→ Common Stock (95,191)	95,191	Direct
Sept. 29, 2017	ECVT	Option (Right to Buy)→ Common Stock (95,192)	95,192	Direct
Aug. 12, 2005	AIR	Common Stock	0	Direct