John Peter Walker

Insider

First SEC filing: Jan. 30, 2009 · Latest: Jan. 30, 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.

Insider at

GERN selling Jan. 30, 2009

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 23 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

23 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
Jan. 30, 2009	GERN	M	1,117	$3.97	$4,434	155,000 Direct	-0.72%	Disposed	-58.0% (price as of 2026-08-19)
Jan. 30, 2009	GERN	M	15,000	$3.97	$59,550	156,117 Direct	-8.77%	Disposed	-58.0% (price as of 2026-08-19)
Jan. 30, 2009	GERN	M	10,000	$5.08	$50,800	171,117 Direct	-5.52%	Disposed	-67.2% (price as of 2026-08-19)
Jan. 30, 2009	GERN	M	2,500	$5.08	$12,700	181,117 Direct	-1.36%	Disposed	-67.2% (price as of 2026-08-19)
Jan. 30, 2009	GERN	M	20,000	$5.08	$101,600	183,617 Direct	-9.82%	Disposed	-67.2% (price as of 2026-08-19)
Jan. 30, 2009	GERN	S	48,617	$8.28	$402,549	39,119 Direct	-55.41%	Disposed	-79.9% (price as of 2026-08-19)
Jan. 30, 2009	GERN	M	1,117	$3.97	$4,434	87,736 Direct	+1.29%	Acquired	-58.0% (price as of 2026-08-19)
Jan. 30, 2009	GERN	M	15,000	$3.97	$59,550	86,619 Direct	+20.94%	Acquired	-58.0% (price as of 2026-08-19)
Jan. 30, 2009	GERN	M	10,000	$5.08	$50,800	71,619 Direct	+16.23%	Acquired	-67.2% (price as of 2026-08-19)
Jan. 30, 2009	GERN	M	2,500	$5.08	$12,700	61,619 Direct	+4.23%	Acquired	-67.2% (price as of 2026-08-19)
Jan. 30, 2009	GERN	M	20,000	$5.08	$101,600	59,119 Direct	+51.13%	Acquired	-67.2% (price as of 2026-08-19)
May 28, 2008	GERN	A	6,700	$3.97	$26,599	215,900 Direct	+3.20%	Acquired	-58.0% (price as of 2026-08-19)
May 28, 2008	GERN	A	15,000	$3.97	$59,550	209,200 Direct	+7.72%	Acquired	-58.0% (price as of 2026-08-19)
May 28, 2008	GERN	A	7,500	—	—	59,744 Direct	+14.36%	Acquired	(price as of 2026-08-19)
May 28, 2008	GERN	A	7,557	—	—	52,244 Direct	+16.91%	Acquired	(price as of 2026-08-19)
May 23, 2007	GERN	A	15,000	$9.32	$139,800	194,200 Direct	+8.37%	Acquired	-82.1% (price as of 2026-08-19)
May 23, 2007	GERN	A	7,500	—	—	44,687 Direct	+20.17%	Acquired	(price as of 2026-08-19)
May 23, 2007	GERN	A	15,000	—	—	37,187 Direct	+67.61%	Acquired	(price as of 2026-08-19)
Jan. 3, 2007	GERN	A	20,000	—	—	22,187 Direct	+914.49%	Acquired	(price as of 2026-08-19)
May 24, 2006	GERN	A	30,000	$6.63	$198,900	191,100 Direct	+18.62%	Acquired	-74.9% (price as of 2026-08-19)
May 6, 2005	GERN	A	2,187	—	—	2,187 Direct	—	Acquired	(price as of 2026-08-19)
May 6, 2005	GERN	A	22,500	$6.40	$144,000	161,100 Direct	+16.23%	Acquired	-74.0% (price as of 2026-08-19)
Jan. 12, 2005	GERN	A	10,000	$8.83	$88,300	138,600 Direct	+7.78%	Acquired	-81.1% (price as of 2026-08-19)
May 27, 2004	GERN	A	22,500	$7.56	$170,100	128,600 Direct	+21.21%	Acquired	-78.0% (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.

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. 30, 2009	GERN	Stock Option (right to buy)	Common Stock (1,117)	$3.97	April 28, 2009	1,117	Disposed
Jan. 30, 2009	GERN	Stock Option (right to buy)	Common Stock (15,000)	$3.97	April 28, 2009	15,000	Disposed
Jan. 30, 2009	GERN	Stock Option (right to buy)	Common Stock (10,000)	$5.08	April 28, 2009	10,000	Disposed
Jan. 30, 2009	GERN	Stock Option (right to buy)	Common Stock (2,500)	$5.08	April 28, 2009	2,500	Disposed
Jan. 30, 2009	GERN	Stock Option (right to buy)	Common Stock (20,000)	$5.08	April 28, 2009	20,000	Disposed
May 28, 2008	GERN	Stock Option (right to buy)	Common Stock (6,700)	$3.97	May 28, 2018	6,700	Acquired
May 28, 2008	GERN	Stock Option (right to buy)	Common Stock (15,000)	$3.97	May 28, 2018	15,000	Acquired
May 23, 2007	GERN	Stock Option (right to buy)	Common Stock (15,000)	$9.32	May 23, 2017	15,000	Acquired
May 24, 2006	GERN	Stock Option (right to buy)	Common Stock (30,000)	$6.63	May 24, 2016	30,000	Acquired
May 6, 2005	GERN	Stock Option (right to buy)	Common Stock (22,500)	$6.40	May 2, 2015	22,500	Acquired
Jan. 12, 2005	GERN	Stock Option (right to buy)	Common Stock (10,000)	$8.83	Jan. 12, 2015	10,000	Acquired
May 27, 2004	GERN	Stock Option (right to buy)	Common Stock (22,500)	$7.56	May 27, 2014	22,500	Acquired

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