Thomas C Knudson

Insider

First SEC filing: May 16, 2013 · Latest: May 16, 2013

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Insider at

0 buys (P) 0 sells (S) Net: $0 + 7 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

7 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
Feb. 21, 2014	AMPY	A	25,000	—	—	42,000 Direct	+147.06%	Acquired	(price as of 2026-08-19)
Nov. 20, 2013	MDU	A	3,603	$30.53	$110,000	28,070 Direct	+14.73%	Acquired	76.8% (price as of 2026-08-19)
May 16, 2013	AMPY	A	16,000	—	—	17,000 Direct	+1600.00%	Acquired	(price as of 2026-08-19)
Nov. 19, 2012	MDU	A	5,467	$20.12	$109,996	24,467 Direct	+28.77%	Acquired	168.2% (price as of 2026-08-19)
Nov. 21, 2011	MDU	A	5,450	$20.18	$109,981	19,000 Direct	+40.22%	Acquired	167.4% (price as of 2026-08-19)
May 17, 2010	MDU	A	4,050	$19.52	$79,056	13,550 Direct	+42.63%	Acquired	176.5% (price as of 2026-08-19)
May 18, 2009	MDU	A	4,050	$17.15	$69,458	9,500 Direct	+74.31%	Acquired	214.7% (price as of 2026-08-19)
May 8, 2009	MDU	P	3,600	$17.88	$64,368	5,450 Direct	+194.59%	Acquired	201.8% (price as of 2026-08-19)
May 8, 2009	MDU	P	1,400	$17.88	$25,032	1,850 Direct	+311.11%	Acquired	201.8% (price as of 2026-08-19)

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.

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

Date	Ticker	Security	Shares	Ownership
May 16, 2013	AMPY	Common Stock	1,000	Direct
Nov. 6, 2008	MDU	Common Stock	450	Direct