William John Sempolinski

SEC CIK: 0002149024
Latest filing: Aug 14, 2026

SEC filings (opens in a new tab)

RKLB holding history

Rocket Lab Corp in every 13F filed by William John Sempolinski, including the quarters it was sold out or no filing was made. Changes compare share counts with the previous calendar quarter.

RKLB overview All 13F holders of RKLB Full Q2 2026 holdings

Shares (Q2 2026): 25,800
Value: $2.62M
% of portfolio: 1.1%
Quarters held: 3; Since Q4 2025

Holdings of RKLB by William John Sempolinski, by quarter
Quarter	Shares	Value	% of portfolio	Share change	Action	All holders
Q2 2026	25,800	$2.62M	1.1%	−750−2.8%	Reduced	Holders
Q1 2026	26,550	$1.71M	0.9%	−3,550−11.8%	Reduced	Holders
Q4 2025	30,100	$2.10M	1.0%	–	No prior filing	Holders