Paul Buckman

Insider

First SEC filing: Feb. 12, 2014 · Latest: July 30, 2025

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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.
Initial holdings The stakes this person held when they first started reporting.

Insider at

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 30 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

No open-market trades on record; showing all filings.

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
June 26, 2026	SI	A	5,046	—	—	63,750 Direct	+8.60%	Acquired	(price as of 2026-08-20)
April 3, 2026	NMTC	A	26,036	—	—	26,036 Direct	—	Acquired	(price as of 2026-08-20)
April 3, 2026	NMTC	A	41,929	—	—	178,733 Direct	+30.65%	Acquired	(price as of 2026-08-20)
March 31, 2026	HSDT	A	23,529	—	—	23,529 Direct	—	Acquired	(price as of 2026-08-20)
March 31, 2026	HSDT	A	2,180	—	—	92,004 Direct	+2.43%	Acquired	(price as of 2026-08-20)
March 13, 2026	SI	M	26,205	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
March 13, 2026	SI	M	19,401	—	—	1,142 Direct	-94.44%	Disposed	(price as of 2026-08-20)
March 13, 2026	SI	F	3,714	$14.82	$55,041	58,704 Direct	-5.95%	Disposed	54.2% (price as of 2026-08-20)
March 13, 2026	SI	F	3,292	$14.62	$48,129	62,418 Direct	-5.01%	Disposed	56.3% (price as of 2026-08-20)
March 13, 2026	SI	M	26,205	$2.10	$55,030	65,710 Direct	+66.33%	Acquired	988.3% (price as of 2026-08-20)
March 13, 2026	SI	M	19,401	$2.48	$48,114	39,505 Direct	+96.50%	Acquired	821.6% (price as of 2026-08-20)
July 2, 2025	HSDT	A	2,600	—	—	2,600 Direct	—	Acquired	(price as of 2026-08-20)
Feb. 14, 2025	NMTC	A	17,025	—	—	17,025 Direct	—	Acquired	(price as of 2026-08-20)
Feb. 14, 2025	NMTC	A	27,778	—	—	136,804 Direct	+25.48%	Acquired	(price as of 2026-08-20)
Jan. 6, 2025	HSDT	A	10,732	—	—	10,732 Direct	—	Acquired	(price as of 2026-08-20)
Aug. 1, 2024	NMTC	A	20,834	$0.12	$2,500	20,834 Direct	—	Acquired	209.7% (price as of 2026-08-20)
Aug. 1, 2024	NMTC	A	27,778	$0.81	$22,500	109,026 Direct	+34.19%	Acquired	-54.1% (price as of 2026-08-20)
July 2, 2024	HSDT	A	31,000	—	—	31,000 Direct	—	Acquired	(price as of 2026-08-20)
May 24, 2023	HSDT	A	284,865	—	—	284,865 Direct	—	Acquired	(price as of 2026-08-20)
May 24, 2023	HSDT	A	83,054	—	—	89,824 Direct	+1226.79%	Acquired	(price as of 2026-08-20)
March 16, 2023	NMTC	A	18,927	—	—	18,927 Direct	—	Acquired	(price as of 2026-08-20)
March 16, 2023	NMTC	A	20,576	—	—	81,248 Direct	+33.91%	Acquired	(price as of 2026-08-20)
May 31, 2022	NMTC	A	29,230	—	—	29,230 Direct	—	Acquired	(price as of 2026-08-20)
May 31, 2022	NMTC	A	29,240	—	—	60,672 Direct	+93.03%	Acquired	(price as of 2026-08-20)
May 23, 2022	HSDT	A	21,605	—	—	21,605 Direct	—	Acquired	(price as of 2026-08-20)
May 23, 2022	HSDT	A	6,049	—	—	6,770 Direct	+838.97%	Acquired	(price as of 2026-08-20)
Sept. 10, 2021	HSDT	A	2,547	—	—	2,547 Direct	—	Acquired	(price as of 2026-08-20)
Sept. 10, 2021	HSDT	A	721	—	—	721 Direct	—	Acquired	(price as of 2026-08-20)
July 30, 2013	NUWE	M	3,384	—	—	3,384 Direct	—	Acquired	(price as of 2026-08-20)
July 30, 2013	NUWE	A	2,332	$7.50	$17,490	2,332 Direct	—	Acquired	-100.0% (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
April 3, 2026	NMTC	Option to Purchase Common Stock	Common Stock (26,036)	$0.80	April 2, 2036	26,036	Acquired
March 31, 2026	HSDT	Stock Option (Right to Buy)	Class A Common Stock (23,529)	$6.88	March 30, 2036	23,529	Acquired
March 13, 2026	SI	Stock Option	Common Stock (26,205)	$2.10	Dec. 16, 2030	26,205	Disposed
March 13, 2026	SI	Stock Option	Common Stock (19,401)	$2.48	May 17, 2033	19,401	Disposed
July 2, 2025	HSDT	Stock Option (Right to Buy)	Class A Common Stock (2,600)	$9.76	July 1, 2035	2,600	Acquired
Feb. 14, 2025	NMTC	Option to Purchase Common Stock	Common Stock (17,025)	$1.20	Feb. 14, 2035	17,025	Acquired
Jan. 6, 2025	HSDT	Stock Option (Right to Buy)	Class A Common Stock (10,732)	$0.73	Jan. 5, 2035	10,732	Acquired
Aug. 1, 2024	NMTC	Warrants (Right to Buy)	Common Stock (20,834)	$1.19	Aug. 1, 2027	20,834	Acquired
July 2, 2024	HSDT	Stock Option (Right to Buy)	Class A Common Stock (31,000)	$0.96	July 1, 2034	31,000	Acquired
May 24, 2023	HSDT	Stock Option (Right to Buy)	Class A Common Stock (284,865)	$0.16	May 23, 2033	284,865	Acquired
March 16, 2023	NMTC	Option to Purchase Common Stock	Common Stock (18,927)	$1.62	March 16, 2033	18,927	Acquired
May 31, 2022	NMTC	Option to Purchase Common Stock	Common Stock (29,230)	$1.14	May 31, 2032	29,230	Acquired
May 23, 2022	HSDT	Stock Option (Right to Buy)	Class A Common Stock (21,605)	$1.40	May 22, 2032	21,605	Acquired
Sept. 10, 2021	HSDT	Stock Option (Right to Buy)	Class A Common Stock (2,547)	$14.90	Sept. 9, 2031	2,547	Acquired
July 30, 2013	NUWE	Non-Qualified Stock Option (right to buy)	Common Stock (2,332)	$7.50	July 30, 2023	2,332	Acquired

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

Initial ownership (Form 3) 6 holdings

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

Date	Ticker	Security	Shares	Ownership
July 30, 2025	SI	Series D Convertible Preferred Stock→ Common Stock (6,198)	6,198	Direct
July 30, 2025	SI	Stock Option→ Common Stock (26,205)	26,205	Direct
July 30, 2025	SI	Stock Option→ Common Stock (20,543)	20,543	Direct
July 30, 2025	SI	Stock Option→ Common Stock (15,212)	15,212	Direct
Aug. 4, 2017	NMTC	Stock Option (right to buy)→ Common Stock (34,020)	34,020	Direct
Feb. 15, 2012	NUWE	Employee Stock Option (Right to Buy)→ Common Stock (11,685)	11,685	Direct