Michael R Niggli

Insider

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

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Insider at

0 buys (P) 0 sells (S) Net: $0 + 14 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

14 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
Oct. 13, 2025	GWH	A	13,513	—	—	90,825 Direct	+17.48%	Acquired	(price as of 2026-08-20)
May 17, 2024	PCG	A	9,677	—	—	58,846 Direct	+19.68%	Acquired	(price as of 2026-08-20)
May 19, 2023	PCG	A	10,836	—	—	49,149 Direct	+28.28%	Acquired	(price as of 2026-08-20)
May 19, 2022	PCG	A	11,532	—	—	38,313 Direct	+43.06%	Acquired	(price as of 2026-08-20)
March 1, 2022	GWH	P	20,000	$5.01	$100,200	530,235 Direct	+3.92%	Acquired	-99.1% (price as of 2026-08-20)
Nov. 15, 2021	GWH	A	30,053	—	—	510,219 Direct	+6.26%	Acquired	(price as of 2026-08-20)
Nov. 9, 2021	GWH	J	77,822	$10.00	$778,220	568,302 Indirect	+15.87%	Acquired	-99.6% (price as of 2026-08-20)
Nov. 9, 2021	GWH	J	11,670	$10.00	$116,700	85,225 Indirect	+15.87%	Acquired	-99.6% (price as of 2026-08-20)
Nov. 9, 2021	GWH	J	11,670	$10.00	$116,700	85,225 Indirect	+15.87%	Acquired	-99.6% (price as of 2026-08-20)
Nov. 9, 2021	GWH	J	11,670	$10.00	$116,700	85,225 Indirect	+15.87%	Acquired	-99.6% (price as of 2026-08-20)
Nov. 9, 2021	GWH	J	11,670	$10.00	$116,700	85,225 Indirect	+15.87%	Acquired	-99.6% (price as of 2026-08-20)
Nov. 9, 2021	GWH	J	31,140	$10.00	$311,400	227,400 Indirect	+15.87%	Acquired	-99.6% (price as of 2026-08-20)
Nov. 9, 2021	GWH	J	65,752	$10.00	$657,520	480,166 Direct	+15.87%	Acquired	-99.6% (price as of 2026-08-20)
May 20, 2021	PCG	A	13,461	—	—	26,781 Direct	+101.06%	Acquired	(price as of 2026-08-20)
Aug. 3, 2020	PCG	A	12,820	—	—	13,320 Direct	+2564.00%	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.

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

Date	Ticker	Security	Shares	Ownership
Oct. 18, 2021	GWH	Common Stock	414,414	Direct
Oct. 18, 2021	GWH	Common Stock	196,260	Indirect
Oct. 18, 2021	GWH	Common Stock	490,480	Indirect
Oct. 18, 2021	GWH	Common Stock	73,555	Indirect
Oct. 18, 2021	GWH	Common Stock	73,555	Indirect
Oct. 18, 2021	GWH	Common Stock	73,555	Indirect
Oct. 18, 2021	GWH	Common Stock	73,555	Indirect
Oct. 18, 2021	GWH	Stock Option (right to buy)→ Common Stock (177,785)	177,785	Direct
Oct. 18, 2021	GWH	Restricted Stock Units→ Common Stock (30,053)	30,053	Direct
July 10, 2020	PCG	Common Stock	500	Direct