Charles G Curtis

CIK 1196423 · View on SEC EDGAR ↗

Insider

First SEC filing: Jan. 21, 2014 · Latest: Jan. 21, 2014

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

NGS selling Dec. 9, 2016

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 46 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

46 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
June 10, 2020	NGS	M	3,546	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
June 10, 2020	NGS	M	3,546	—	—	3,546 Indirect	—	Acquired	(price as of 2026-08-20)
April 28, 2020	NGS	A	3,546	—	—	3,546 Direct	—	Acquired	(price as of 2026-08-20)
April 28, 2020	NGS	A	886	$5.64	$4,997	86,755 Direct	+1.03%	Acquired	529.3% (price as of 2026-08-20)
March 29, 2019	NGS	A	5,784	$17.29	$100,005	85,869 Direct	+7.22%	Acquired	105.3% (price as of 2026-08-20)
March 15, 2018	NGS	A	4,072	$24.55	$99,968	80,085 Direct	+5.36%	Acquired	44.6% (price as of 2026-08-20)
Dec. 21, 2017	NGS	A	2,500	$20.48	$51,200	76,013 Direct	+3.40%	Acquired	73.3% (price as of 2026-08-20)
Dec. 21, 2017	NGS	M	2,500	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Dec. 11, 2017	NGS	M	2,500	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Dec. 11, 2017	NGS	M	2,500	$19.61	$49,025	73,513 Direct	+3.52%	Acquired	81.0% (price as of 2026-08-20)
March 23, 2017	NGS	A	3,992	$25.05	$100,000	71,013 Direct	+5.96%	Acquired	41.7% (price as of 2026-08-20)
Dec. 9, 2016	NGS	S	8,000	$33.30	$266,400	67,021 Direct	-10.66%	Disposed	6.6% (price as of 2026-08-20)
Nov. 11, 2016	NGS	M	2,500	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Nov. 11, 2016	NGS	M	2,500	$13.90	$34,750	75,021 Direct	+3.45%	Acquired	155.3% (price as of 2026-08-20)
April 6, 2016	NGS	A	5,884	$20.39	$119,975	72,521 Direct	+8.83%	Acquired	74.1% (price as of 2026-08-20)
Dec. 4, 2015	NGS	M	2,500	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Dec. 4, 2015	NGS	M	2,500	$16.96	$42,400	66,637 Direct	+3.90%	Acquired	109.3% (price as of 2026-08-20)
March 19, 2015	NGS	A	5,492	$18.75	$102,975	64,137 Direct	+9.36%	Acquired	89.3% (price as of 2026-08-20)
March 20, 2014	NGS	A	3,288	$30.41	$99,988	58,645 Direct	+5.94%	Acquired	16.7% (price as of 2026-08-20)
March 21, 2013	NGS	A	2,500	$18.75	$46,875	59,357 Direct	+4.40%	Acquired	89.3% (price as of 2026-08-20)
Dec. 31, 2012	NGS	G	12,000	—	—	46,857 Direct	-20.39%	Disposed	(price as of 2026-08-20)
July 30, 2012	NGS	M	2,500	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
July 30, 2012	NGS	M	2,500	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
July 30, 2012	NGS	M	2,500	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
July 30, 2012	NGS	M	2,500	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
July 30, 2012	NGS	A	2,500	$8.00	$20,000	56,857 Direct	+4.60%	Acquired	343.6% (price as of 2026-08-20)
July 30, 2012	NGS	A	2,500	$9.34	$23,350	54,357 Direct	+4.82%	Acquired	280.0% (price as of 2026-08-20)
July 30, 2012	NGS	A	2,500	$5.55	$13,875	51,857 Direct	+5.07%	Acquired	539.5% (price as of 2026-08-20)
July 30, 2012	NGS	A	2,500	$3.88	$9,700	49,357 Direct	+5.34%	Acquired	814.7% (price as of 2026-08-20)
March 28, 2012	NGS	A	2,500	$13.43	$33,575	58,857 Direct	+4.44%	Acquired	164.3% (price as of 2026-08-20)
April 11, 2011	NGS	A	2,500	$17.41	$43,525	56,357 Direct	+4.64%	Acquired	103.8% (price as of 2026-08-20)
March 23, 2010	NGS	A	5,000	—	—	5,000 Direct	—	Acquired	(price as of 2026-08-20)
March 18, 2009	NGS	A	2,500	—	—	2,500 Direct	—	Acquired	(price as of 2026-08-20)
May 12, 2008	NGS	S	2,000	$26.54	$53,080	23,000 Direct	-8.00%	Disposed	33.7% (price as of 2026-08-20)
May 9, 2008	NGS	S	8,000	$26.34	$210,720	25,000 Direct	-24.24%	Disposed	34.7% (price as of 2026-08-20)
March 18, 2008	NGS	A	2,500	—	—	2,500 Direct	—	Acquired	(price as of 2026-08-20)
Dec. 31, 2007	NGS	A	2,500	—	—	2,500 Direct	—	Acquired	(price as of 2026-08-20)
Dec. 29, 2006	NGS	A	2,500	—	—	2,500 Direct	—	Acquired	(price as of 2026-08-20)
Dec. 29, 2006	NGS	A	2,500	—	—	2,500 Direct	—	Acquired	(price as of 2026-08-20)
Nov. 21, 2006	NGS	M	24,000	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Nov. 21, 2006	NGS	M	16,000	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Nov. 21, 2006	NGS	F	5,486	$14.22	$78,011	18,514 Direct	-22.86%	Disposed	149.6% (price as of 2026-08-20)
Nov. 21, 2006	NGS	M	24,000	$3.25	$78,000	0 Direct	—	Acquired	992.0% (price as of 2026-08-20)
Nov. 21, 2006	NGS	F	3,657	$14.22	$52,003	12,343 Direct	-22.86%	Disposed	149.6% (price as of 2026-08-20)
Nov. 21, 2006	NGS	M	16,000	$3.25	$52,000	0 Direct	—	Acquired	992.0% (price as of 2026-08-20)
Dec. 30, 2005	NGS	A	2,500	—	—	2,500 Direct	—	Acquired	(price as of 2026-08-20)
Jan. 5, 2005	NGS	A	2,500	—	—	2,500 Direct	—	Acquired	(price as of 2026-08-20)
March 26, 2004	NGS	C	18,000	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
March 26, 2004	NGS	C	18,000	—	—	33,000 Direct	+120.00%	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
June 10, 2020	NGS	Restricted Stock Units	Common Stock (3,546)	—	—	3,546	Disposed
April 28, 2020	NGS	Restricted Stock Units	Common Stock (3,546)	—	—	3,546	Acquired
Dec. 21, 2017	NGS	Nonqualified Stock Option	Common Stock (2,500)	$20.48	March 31, 2018	2,500	Disposed
Dec. 11, 2017	NGS	Nonqualified Stock Option	Common Stock (2,500)	$19.61	Dec. 31, 2017	2,500	Disposed
Nov. 11, 2016	NGS	Non-Qualified Stock Option	Common Stock (2,500)	$13.90	Jan. 1, 2017	2,500	Disposed
Dec. 4, 2015	NGS	Nonqualified Stock Option (right to buy)	Common Stock (2,500)	$16.96	Dec. 30, 2015	2,500	Disposed
July 30, 2012	NGS	Nonqualified Stock Option (right to buy)	Common Stock (2,500)	$8.00	March 18, 2019	2,500	Disposed
July 30, 2012	NGS	Nonqualified Stock Option (right to buy)	Common Stock (2,500)	$9.34	Jan. 5, 2015	2,500	Disposed
July 30, 2012	NGS	Nonqualified Stock Option (right to buy)	Common Stock (2,500)	$5.55	Dec. 31, 2013	2,500	Disposed
July 30, 2012	NGS	Nonqualified Stock Option (right to buy)	Common Stock (2,500)	$3.88	Dec. 31, 2012	2,500	Disposed
March 23, 2010	NGS	Nonqualified Stock Option (right to buy) [F2]	Common Stock (5,000)	$16.74	March 22, 2020	5,000	Acquired
March 18, 2009	NGS	Nonqualified Stock Option (right to buy) [F1]	Common Stock (2,500)	$8.00	March 18, 2019	2,500	Acquired
March 18, 2008	NGS	Nonqualified Stock Option (right to buy) [F1]	Common Stock (2,500)	$20.48	March 18, 2018	2,500	Acquired
Dec. 31, 2007	NGS	Nonqualified Stock Option (right to buy) [F1]	Common Stock (2,500)	$19.61	Dec. 31, 2017	2,500	Acquired
Dec. 29, 2006	NGS	Nonqualified Stock Option (right to buy) [F1]	Common Stock (2,500)	$13.90	Jan. 1, 2007	2,500	Acquired
Dec. 29, 2006	NGS	Nonqualified Stock Option (right to buy) [F1]	Common Stock (2,500)	$13.90	Dec. 29, 2016	2,500	Acquired
Nov. 21, 2006	NGS	Stock Purchase Warrant (right to buy)	Common Stock (24,000)	$3.25	Dec. 31, 2006	24,000	Disposed
Nov. 21, 2006	NGS	Stock Purchase Warrant (right to buy)	Common Stock (16,000)	$3.25	Dec. 31, 2006	16,000	Disposed
Dec. 30, 2005	NGS	Nonqualified Stock Option (right to buy) [F1]	Common Stock (2,500)	$16.96	Dec. 30, 2015	2,500	Acquired
Jan. 5, 2005	NGS	Nonqualified Stock Option (right to buy) [F1]	Common Stock (2,500)	$9.34	Jan. 5, 2015	2,500	Acquired
March 26, 2004	NGS	Series A Preferred Stock	Common Stock (18,000)	—	—	18,000	Disposed

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