David Earl Williams

Insider

First SEC filing: Sept. 25, 2009 · Latest: Sept. 25, 2009

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

IOSP selling Feb. 23, 2018

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 55 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

55 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
May 24, 2018	IOSP	M	1,004	$44.18	$44,357	644 Direct	-60.92%	Disposed	109.0% (price as of 2026-08-20)
May 24, 2018	IOSP	M	1,004	$75.52	$75,822	14,516 Direct	-6.47%	Disposed	22.3% (price as of 2026-08-20)
May 24, 2018	IOSP	M	1,004	$44.18	$44,357	15,520 Direct	+6.92%	Acquired	109.0% (price as of 2026-08-20)
Feb. 23, 2018	IOSP	M	982	$43.95	$43,159	7,102 Direct	-12.15%	Disposed	110.1% (price as of 2026-08-20)
Feb. 23, 2018	IOSP	M	2,160	—	—	8,084 Direct	-21.09%	Disposed	(price as of 2026-08-20)
Feb. 23, 2018	IOSP	S	982	$68.54	$67,306	14,516 Direct	-6.34%	Disposed	34.7% (price as of 2026-08-20)
Feb. 23, 2018	IOSP	M	982	$43.95	$43,159	15,498 Direct	+6.76%	Acquired	110.1% (price as of 2026-08-20)
Feb. 23, 2018	IOSP	S	2,160	$68.54	$148,046	14,516 Direct	-12.95%	Disposed	34.7% (price as of 2026-08-20)
Feb. 23, 2018	IOSP	M	2,160	—	—	16,676 Direct	+14.88%	Acquired	(price as of 2026-08-20)
Feb. 23, 2017	IOSP	M	277	—	—	10,784 Direct	-2.50%	Disposed	(price as of 2026-08-20)
Feb. 23, 2017	IOSP	M	730	$46.03	$33,602	11,061 Direct	-6.19%	Disposed	100.6% (price as of 2026-08-20)
Feb. 23, 2017	IOSP	M	1,505	—	—	11,971 Direct	-11.17%	Disposed	(price as of 2026-08-20)
Feb. 23, 2017	IOSP	S	277	$67.92	$18,814	14,516 Direct	-1.87%	Disposed	36.0% (price as of 2026-08-20)
Feb. 23, 2017	IOSP	M	277	—	—	14,793 Direct	+1.91%	Acquired	(price as of 2026-08-20)
Feb. 23, 2017	IOSP	S	730	$67.92	$49,582	14,516 Direct	-4.79%	Disposed	36.0% (price as of 2026-08-20)
Feb. 23, 2017	IOSP	M	730	$46.03	$33,602	15,246 Direct	+5.03%	Acquired	100.6% (price as of 2026-08-20)
Feb. 23, 2017	IOSP	S	1,505	$67.92	$102,220	14,516 Direct	-9.39%	Disposed	36.0% (price as of 2026-08-20)
Feb. 23, 2017	IOSP	M	1,505	—	—	16,021 Direct	+10.37%	Acquired	(price as of 2026-08-20)
Feb. 21, 2017	IOSP	A	644	$70.60	$45,466	14,001 Direct	+4.82%	Acquired	30.8% (price as of 2026-08-20)
Feb. 21, 2017	IOSP	A	2,897	—	—	13,357 Direct	+27.70%	Acquired	(price as of 2026-08-20)
Feb. 22, 2016	IOSP	A	2,760	—	—	10,360 Direct	+36.32%	Acquired	(price as of 2026-08-20)
Feb. 22, 2016	IOSP	A	1,004	$44.18	$44,357	7,600 Direct	+15.22%	Acquired	109.0% (price as of 2026-08-20)
March 10, 2015	IOSP	M	1,380	$29.56	$40,793	7,745 Direct	-15.12%	Disposed	212.4% (price as of 2026-08-20)
March 10, 2015	IOSP	M	3,794	—	—	9,125 Direct	-29.37%	Disposed	(price as of 2026-08-20)
March 10, 2015	IOSP	S	1,380	$43.14	$59,533	14,516 Direct	-8.68%	Disposed	114.1% (price as of 2026-08-20)
March 10, 2015	IOSP	M	1,380	$29.56	$40,793	15,896 Direct	+9.51%	Acquired	212.4% (price as of 2026-08-20)
March 10, 2015	IOSP	S	3,680	$43.14	$158,755	14,516 Direct	-20.22%	Disposed	114.1% (price as of 2026-08-20)
March 10, 2015	IOSP	M	3,680	—	—	18,196 Direct	+25.35%	Acquired	(price as of 2026-08-20)
March 10, 2015	IOSP	M	1,380	$29.56	$40,793	7,745 Direct	-15.12%	Disposed	212.4% (price as of 2026-08-20)
March 10, 2015	IOSP	M	3,794	—	—	9,125 Direct	-29.37%	Disposed	(price as of 2026-08-20)
March 10, 2015	IOSP	S	1,380	$43.14	$59,533	13,367 Direct	-9.36%	Disposed	114.1% (price as of 2026-08-20)
March 10, 2015	IOSP	M	1,380	$29.56	$40,793	14,747 Direct	+10.32%	Acquired	212.4% (price as of 2026-08-20)
March 10, 2015	IOSP	S	3,680	$43.14	$158,755	13,367 Direct	-21.59%	Disposed	114.1% (price as of 2026-08-20)
March 10, 2015	IOSP	M	3,680	—	—	17,047 Direct	+27.53%	Acquired	(price as of 2026-08-20)
Feb. 24, 2015	IOSP	M	894	—	—	9,237 Direct	-8.82%	Disposed	(price as of 2026-08-20)
Feb. 24, 2015	IOSP	M	894	—	—	13,367 Direct	+7.17%	Acquired	(price as of 2026-08-20)
Feb. 23, 2015	IOSP	A	2,700	—	—	12,919 Direct	+26.42%	Acquired	(price as of 2026-08-20)
Feb. 23, 2015	IOSP	A	982	$43.95	$43,159	10,219 Direct	+10.63%	Acquired	110.1% (price as of 2026-08-20)
June 6, 2014	IOSP	P	185	$43.16	$7,985	12,473 Direct	+1.51%	Acquired	114.0% (price as of 2026-08-20)
Feb. 21, 2014	IOSP	A	277	—	—	10,131 Direct	+2.81%	Acquired	(price as of 2026-08-20)
Feb. 18, 2014	IOSP	A	277	$44.59	$12,351	12,288 Direct	+2.31%	Acquired	107.1% (price as of 2026-08-20)
Feb. 14, 2014	IOSP	A	2,007	—	—	9,854 Direct	+25.58%	Acquired	(price as of 2026-08-20)
Feb. 14, 2014	IOSP	A	730	$46.03	$33,602	7,847 Direct	+10.26%	Acquired	100.6% (price as of 2026-08-20)
June 6, 2013	IOSP	M	100	—	—	7,117 Direct	-1.39%	Disposed	(price as of 2026-08-20)
June 6, 2013	IOSP	F	31	$41.04	$1,272	12,011 Direct	-0.26%	Disposed	125.0% (price as of 2026-08-20)
June 6, 2013	IOSP	M	100	—	—	12,042 Direct	+0.84%	Acquired	(price as of 2026-08-20)
April 12, 2013	IOSP	F	808	$42.32	$34,195	11,942 Direct	-6.34%	Disposed	118.2% (price as of 2026-08-20)
April 4, 2013	IOSP	M	6,448	—	—	13,063 Direct	+97.48%	Acquired	(price as of 2026-08-20)
April 4, 2013	IOSP	F	1,999	$39.88	$79,720	11,064 Direct	-15.30%	Disposed	131.6% (price as of 2026-08-20)
April 4, 2013	IOSP	M	6,448	—	—	8,903 Direct	-42.00%	Disposed	(price as of 2026-08-20)
March 12, 2013	IOSP	M	1,686	$10.38	$17,501	7,217 Direct	-18.94%	Disposed	789.7% (price as of 2026-08-20)
March 12, 2013	IOSP	M	1,686	—	—	12,750 Direct	+15.24%	Acquired	(price as of 2026-08-20)
Feb. 26, 2013	IOSP	M	1,365	—	—	15,351 Direct	-8.17%	Disposed	(price as of 2026-08-20)
Feb. 26, 2013	IOSP	M	1,365	—	—	6,615 Direct	+26.00%	Acquired	(price as of 2026-08-20)
Nov. 12, 2012	IOSP	M	342	$14.03	$4,798	16,716 Direct	-2.00%	Disposed	558.2% (price as of 2026-08-20)
Nov. 12, 2012	IOSP	A	342	$14.03	$4,798	17,058 Direct	+2.05%	Acquired	558.2% (price as of 2026-08-20)
Nov. 12, 2012	IOSP	M	342	$14.03	$4,798	5,250 Direct	-6.12%	Disposed	558.2% (price as of 2026-08-20)
Feb. 23, 2012	IOSP	A	3,794	—	—	16,716 Direct	+29.36%	Acquired	(price as of 2026-08-20)
Feb. 23, 2012	IOSP	A	1,380	$29.56	$40,793	12,922 Direct	+11.96%	Acquired	212.4% (price as of 2026-08-20)
Feb. 23, 2012	IOSP	A	894	—	—	11,542 Direct	+8.40%	Acquired	(price as of 2026-08-20)
Feb. 22, 2012	IOSP	A	894	$29.79	$26,632	4,908 Direct	+22.27%	Acquired	210.0% (price as of 2026-08-20)
Feb. 25, 2011	IOSP	A	1,149	—	—	10,648 Direct	+12.10%	Acquired	(price as of 2026-08-20)
Feb. 18, 2011	IOSP	P	1,149	$27.44	$31,529	4,014 Direct	+40.10%	Acquired	236.6% (price as of 2026-08-20)
Feb. 25, 2010	IOSP	A	1,365	—	—	9,499 Direct	+16.78%	Acquired	(price as of 2026-08-20)
Feb. 23, 2010	IOSP	P	1,365	$10.57	$14,428	2,865 Direct	+91.00%	Acquired	773.7% (price as of 2026-08-20)
Feb. 17, 2010	IOSP	A	6,448	—	—	8,134 Direct	+382.44%	Acquired	(price as of 2026-08-20)
Feb. 17, 2010	IOSP	A	1,686	—	—	1,686 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
May 24, 2018	IOSP	Stock Options	Common Stock (1,004)	$44.18	March 31, 2019	1,004	Disposed
Feb. 23, 2018	IOSP	Stock Options	Common Stock (982)	$43.95	Feb. 23, 2025	982	Disposed
Feb. 23, 2018	IOSP	Stock Options	Common Stock (2,160)	$0.00	Feb. 23, 2025	2,160	Disposed
Feb. 23, 2017	IOSP	Stock Options	Common Stock (277)	$0.00	Feb. 14, 2024	277	Disposed
Feb. 23, 2017	IOSP	Stock Options	Common Stock (730)	$46.03	Feb. 14, 2024	730	Disposed
Feb. 23, 2017	IOSP	Stock Options	Common Stock (1,505)	$0.00	Feb. 14, 2024	1,505	Disposed
Feb. 21, 2017	IOSP	Stock Options	Common Stock (644)	$70.60	Feb. 21, 2027	644	Acquired
Feb. 21, 2017	IOSP	Stock Options	Common Stock (2,897)	$0.00	March 15, 2020	2,897	Acquired
Feb. 22, 2016	IOSP	Stock Options	Common Stock (2,760)	$0.00	Feb. 22, 2026	2,760	Acquired
Feb. 22, 2016	IOSP	Stock Options	Common Stock (1,004)	$44.18	Feb. 22, 2026	1,004	Acquired
March 10, 2015	IOSP	Stock Options	Common Stock (1,380)	$29.56	Feb. 23, 2022	1,380	Disposed
March 10, 2015	IOSP	Stock Options	Common Stock (3,794)	$0.00	Feb. 23, 2022	3,794	Disposed
March 10, 2015	IOSP	Stock Options	Common Stock (1,380)	$29.56	Feb. 23, 2022	1,380	Disposed
March 10, 2015	IOSP	Stock Options	Common Stock (3,794)	$0.00	Feb. 23, 2022	3,794	Disposed
Feb. 24, 2015	IOSP	Stock Options	Common Stock (894)	$0.00	Feb. 23, 2022	894	Disposed
Feb. 23, 2015	IOSP	Stock Options	Common Stock (2,700)	$0.00	Feb. 23, 2025	2,700	Acquired
Feb. 23, 2015	IOSP	Stock Options	Common Stock (982)	$43.95	Feb. 23, 2025	982	Acquired
Feb. 21, 2014	IOSP	Stock Options (Co-Invest match)	Common Stock (277)	$0.00	Feb. 21, 2024	277	Acquired
Feb. 14, 2014	IOSP	Stock Options (PRSOP)	Common Stock (2,007)	$0.00	Feb. 14, 2018	2,007	Acquired
Feb. 14, 2014	IOSP	Stock Options (CSOP B)	Common Stock (730)	$46.03	Feb. 14, 2024	730	Acquired
June 6, 2013	IOSP	Stock Options	Common Stock (100)	$0.00	March 19, 2020	100	Disposed
April 4, 2013	IOSP	Stock Options	Common Stock (6,448)	$0.00	March 17, 2020	6,448	Disposed
March 12, 2013	IOSP	Stock Options	Common Stock (1,686)	$10.38	March 17, 2020	1,686	Disposed
Feb. 26, 2013	IOSP	Stock Options	Common Stock (1,365)	$0.00	Feb. 25, 2020	1,365	Disposed
Nov. 12, 2012	IOSP	Stock Options	Common Stock (342)	$14.03	Jan. 17, 2013	342	Disposed
Nov. 12, 2012	IOSP	Stock Options	Common Stock (342)	$14.03	Jan. 17, 2013	342	Acquired
Feb. 23, 2012	IOSP	Stock Options	Common Stock (3,794)	$0.00	Feb. 23, 2022	3,794	Acquired
Feb. 23, 2012	IOSP	Stock Options	Common Stock (1,380)	$29.56	Feb. 23, 2022	1,380	Acquired
Feb. 23, 2012	IOSP	Stock Options	Common Stock (894)	$0.00	Feb. 23, 2022	894	Acquired
Feb. 25, 2011	IOSP	Stock Options	Common Stock (1,149)	$0.00	Feb. 25, 2021	1,149	Acquired
Feb. 25, 2010	IOSP	Options	Common Stock (1,365)	$0.00	Feb. 25, 2020	1,365	Acquired
Feb. 17, 2010	IOSP	Options	Common Stock (6,448)	$0.00	Feb. 17, 2020	6,448	Acquired
Feb. 17, 2010	IOSP	Options	Common Stock (1,686)	$10.38	Feb. 17, 2020	1,686	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
Sept. 25, 2009	IOSP	Common Stock	1,500	Direct