SharkWater Trading  •  Space Desk • Rocket Lab Rocket Lab Officer Files to Sell the Same 140,157-Share Block He Sold a Month Ago October 5, 2026 Bottom Line Up Front Rocket Lab (Nasdaq: RKLB) officer Adam C Spice filed a Form 144 on October 1, 2026 to sell 140,157 shares, valued at $9,766,140 on the form, through Morgan Stanley. The block is identical in size to his September 2 sale of 140,157 shares ($8,777,725). Both sit under a Rule 10b5-1 plan he adopted on June 3, 2026. The proposed block is about 0.023 percent of 598,350,482 shares outstanding. This is a scheduled sale, not a signal. The useful number is the implied price: roughly $69.68 a share versus roughly $62.62 a month earlier. What the Form Says The filer lists his relationship to the issuer as "Officer." The form does not give a title, so I am not assigning one. Shares to be sold: 140,157. Approximate sale date: October 1, 2026. The plan adoption date, June 3, 2026, matters because a plan adopted months ahead removes the "he knows something" read. Date Shares Value Aug 17 15,718 $1,291,812 Aug 18 30,908 $2,484,248 Aug 24 9,677 $673,790 Sep 2 140,157 $8,777,725 Oct 1 (proposed) 140,157 $9,766,140 Source: Form 144 filed October 1, 2026 by Adam C Spice (SEC EDGAR, primary document). Oct 1 value is the filer's estimated aggregate market value, not an executed price. Past three months of sales as listed on the form. Divide value by shares and the Oct 1 block prices at about $69.68. The Sep 2 block works out to about $62.62. That is an increase of roughly 11 percent between the two sales. The prices are my arithmetic on the filing's dollar values, not quoted trades. A 10b5-1 plan is a tide clock. The water comes in when the clock says, not when the captain feels like it. What I Could Not Check I could not retrieve the matching Form 4 for the October 1 sale, so the executed price and the post-sale holdings are not verified. I also did not pull Rocket Lab's own newsroom for October. Nothing here says the sale happened at the filed value. The Bull Case Pre-committed selling. The plan dates to June 3, 2026. The sale schedule was set months before the October 1 filing. Small against the float. 140,157 shares is about 0.023 percent of shares outstanding. It does not move the tape. Still higher. The implied price rose about 11 percent between the two sales, so the plan sold into strength, not weakness. The Bear Case It is recurring. Four sales since August 17 total roughly $13.2 million in proceeds on the form. Steady supply is still supply. Cadence is accelerating. Three small August sales gave way to two identical 140,157-share blocks, a month apart. Price is the tell. An officer selling at about $69.68 is not pricing in a collapse. That cuts both ways for anyone hoping for a discount. The SharkWater Take I pass on this as a trade. A scheduled sale under a plan adopted in June tells me when the officer needs liquidity, not what the company will do. The thing I would watch is the next 140,157-share block in early November. If the size changes or the plan gets amended, that is information. Until then this is housekeeping with a dollar sign on it. Tight lines. SharkWater Educational and informational purposes only. Not personalized investment advice. Filing figures are from SEC EDGAR as of October 5, 2026. Implied prices are arithmetic on those figures. The Form 4 was not retrieved. No options data was pulled or computed. The author may hold positions in securities discussed. Do your own work.