Serguei Melnik

Activist

First SEC filing: March 13, 2025 · Latest: March 13, 2025

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Insider at

0 buys (P) 0 sells (S) Net: $0 + 5 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

5 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
March 20, 2024	NTRBW	A	97,500	$2.61	$254,475	245,000 Direct	+66.10%	Acquired	-86.6% (price as of 2026-08-20)
March 6, 2023	NTRBW	G	5,000	—	—	827,999 Direct	-0.60%	Disposed	(price as of 2026-08-20)
Feb. 24, 2022	NTRBW	P	500	$4.03	$2,015	633,000 Direct	+0.08%	Acquired	-91.3% (price as of 2026-08-20)
Feb. 24, 2022	NTRBW	P	5,000	$4.03	$20,150	637,500 Direct	-0.78%	Disposed	-91.3% (price as of 2026-08-20)
Feb. 24, 2022	NTRBW	P	500	$4.03	$2,015	633,000 Direct	-0.08%	Disposed	-91.3% (price as of 2026-08-20)
Feb. 6, 2022	NTRBW	G	10,000	—	—	632,500 Direct	-1.56%	Disposed	(price as of 2026-08-20)
May 30, 2019	NTRBW	G	20,000	—	—	2,530,000 Direct	-0.78%	Disposed	(price as of 2026-08-20)
Aug. 19, 2017	NTRBW	G	450,000	—	—	2,550,000 Direct	-15.00%	Disposed	(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.

Options, RSUs and convertible securities reported on Form 4 Table II.

Date	Ticker	Security	Underlying	Exercise price	Expiration	Shares	A/D
March 20, 2024	NTRBW	Options to Purchase Common Stock	Common Stock (97,500)	$2.61	March 20, 2027	97,500	Acquired

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