Andrew Astor

Insider

First SEC filing: Aug. 18, 2021 · Latest: Aug. 18, 2021

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

NEPH buying Aug. 18, 2021

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 17 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

17 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
Aug. 18, 2021	NEPH	P	2,500	$7.77	$19,425	77,958 Direct	+3.31%	Acquired	-39.2% (price as of 2026-08-20)
Aug. 17, 2021	NEPH	P	2,500	$7.67	$19,175	75,458 Direct	+3.43%	Acquired	-38.4% (price as of 2026-08-20)
Nov. 19, 2020	NEPH	P	1,000	$5.87	$5,870	72,958 Direct	+1.39%	Acquired	-19.5% (price as of 2026-08-20)
Aug. 24, 2020	NEPH	A	152,064	—	—	152,064 Direct	—	Acquired	(price as of 2026-08-20)
Aug. 19, 2020	NEPH	P	950	$7.40	$7,030	71,958 Direct	+1.34%	Acquired	-36.1% (price as of 2026-08-20)
May 28, 2020	NEPH	P	1,000	$6.96	$6,960	71,008 Direct	+1.43%	Acquired	-32.1% (price as of 2026-08-20)
March 12, 2020	NEPH	P	1,000	$6.70	$6,700	70,008 Direct	+1.45%	Acquired	-29.5% (price as of 2026-08-20)
March 5, 2020	NEPH	P	700	$8.46	$5,922	69,008 Direct	+1.02%	Acquired	-44.1% (price as of 2026-08-20)
Feb. 1, 2020	NEPH	A	13,958	—	—	46,525 Direct	+42.86%	Acquired	(price as of 2026-08-20)
Feb. 1, 2020	NEPH	A	19,320	—	—	64,399 Direct	+42.86%	Acquired	(price as of 2026-08-20)
Dec. 16, 2019	NEPH	A	20,000	—	—	20,000 Direct	—	Acquired	(price as of 2026-08-20)
Dec. 16, 2019	NEPH	A	6,848	—	—	68,308 Direct	+11.14%	Acquired	(price as of 2026-08-20)
Nov. 18, 2019	NEPH	P	750	$8.38	$6,285	61,460 Direct	+1.24%	Acquired	-43.6% (price as of 2026-08-20)
Aug. 22, 2019	NEPH	P	1,500	$6.97	$10,455	60,710 Direct	+2.53%	Acquired	-32.2% (price as of 2026-08-20)
Aug. 9, 2019	NEPH	A	9,305	—	—	32,567 Direct	+40.00%	Acquired	(price as of 2026-08-20)
Aug. 9, 2019	NEPH	A	12,880	—	—	45,079 Direct	+40.00%	Acquired	(price as of 2026-08-20)
June 14, 2019	NEPH	P	35,000	$0.64	$22,400	532,903 Direct	+7.03%	Acquired	-18.0% (price as of 2026-08-20)
Dec. 19, 2018	NEPH	A	200,000	—	—	200,000 Direct	—	Acquired	(price as of 2026-08-20)
Dec. 14, 2018	NEPH	A	44,111	—	—	497,903 Direct	+9.72%	Acquired	(price as of 2026-08-20)
May 14, 2018	NEPH	X	33,333	—	—	133,333 Direct	-20.00%	Disposed	(price as of 2026-08-20)
May 14, 2018	NEPH	X	33,333	$0.30	$10,000	453,792 Direct	+7.93%	Acquired	75.0% (price as of 2026-08-20)
April 10, 2018	NEPH	P	80,000	$0.45	$36,000	420,459 Direct	+23.50%	Acquired	16.7% (price as of 2026-08-20)
March 9, 2018	NEPH	P	5,000	$0.48	$2,400	340,459 Direct	+1.49%	Acquired	9.4% (price as of 2026-08-20)
Dec. 20, 2017	NEPH	A	50,000	—	—	50,000 Direct	—	Acquired	(price as of 2026-08-20)
Dec. 20, 2017	NEPH	A	120,417	—	—	335,459 Direct	+56.00%	Acquired	(price as of 2026-08-20)
Dec. 4, 2017	NEPH	P	8,333	$0.50	$4,166	215,042 Direct	+4.03%	Acquired	5.0% (price as of 2026-08-20)
Dec. 1, 2017	NEPH	P	10,000	$0.50	$5,000	206,709 Direct	+5.08%	Acquired	5.0% (price as of 2026-08-20)
Aug. 28, 2017	NEPH	P	4,000	$0.27	$1,080	196,709 Direct	+2.08%	Acquired	94.4% (price as of 2026-08-20)
Aug. 28, 2017	NEPH	P	6,000	$0.27	$1,620	192,709 Direct	+3.21%	Acquired	94.4% (price as of 2026-08-20)
Aug. 11, 2017	NEPH	P	20,000	$0.26	$5,200	186,666 Direct	+12.00%	Acquired	101.9% (price as of 2026-08-20)
June 16, 2017	NEPH	L	43	$0.26	$11	186,709 Direct	+0.02%	Acquired	101.9% (price as of 2026-08-20)
May 1, 2017	NEPH	A	209,355	—	—	209,355 Direct	—	Acquired	(price as of 2026-08-20)
May 1, 2017	NEPH	A	209,355	—	—	209,355 Direct	—	Acquired	(price as of 2026-08-20)
March 17, 2017	NEPH	P	166,666	—	—	166,666 Direct	—	Acquired	(price as of 2026-08-20)
March 17, 2017	NEPH	P	166,666	—	—	166,666 Direct	—	Acquired	(price as of 2026-08-20)
Feb. 13, 2017	NEPH	A	289,785	—	—	289,785 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
Aug. 24, 2020	NEPH	Stock Option (right to buy)	Common Stock (152,064)	$7.07	Aug. 24, 2030	152,064	Acquired
Feb. 1, 2020	NEPH	Stock Option (right to buy)	Common Stock (13,958)	$2.64	May 1, 2027	13,958	Acquired
Feb. 1, 2020	NEPH	Stock Option (right to buy)	Common Stock (19,320)	$4.14	Feb. 13, 2027	19,320	Acquired
Dec. 16, 2019	NEPH	Stock Option (right to buy)	Common Stock (20,000)	$8.30	Dec. 16, 2029	20,000	Acquired
Aug. 9, 2019	NEPH	Stock Option (right to buy)	Common Stock (9,305)	$2.64	May 1, 2027	9,305	Acquired
Aug. 9, 2019	NEPH	Stock Option (right to buy)	Common Stock (12,880)	$4.14	Feb. 13, 2027	12,880	Acquired
Dec. 19, 2018	NEPH	Stock Option (right to buy)	Common Stock (200,000)	$0.65	Dec. 19, 2028	200,000	Acquired
May 14, 2018	NEPH	Warrants (right to buy)	Common Stock (33,333)	$0.30	March 17, 2022	33,333	Disposed
Dec. 20, 2017	NEPH	Stock Option (right to buy)	Common Stock (50,000)	$0.50	Dec. 20, 2027	50,000	Acquired
May 1, 2017	NEPH	Stock Option (right to buy)	Common Stock (209,355)	$0.29	May 1, 2027	209,355	Acquired
May 1, 2017	NEPH	Stock Option (right to buy)	Common Stock (209,355)	$0.29	May 1, 2017	209,355	Acquired
March 17, 2017	NEPH	Warrants (right to buy)	Common Stock (166,666)	$0.30	March 17, 2022	166,666	Acquired
Feb. 13, 2017	NEPH	Stock Option (right to buy)	Common Stock (289,785)	$0.46	Feb. 13, 2027	289,785	Acquired

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