RKLB insider ownership: who sold, why, and what they still hold

What stands out

Three insiders sold more than 25% of vested holdings: Arjun Kampani (65% of holdings, $33.5M, 68% under a disclosed plan), Frank Klein (30% of holdings, $32.2M, 95% under a disclosed plan) and Alexander Slusky (26% of holdings, $25.7M, none under a disclosed plan).Arjun Kampani: largest sale, Jun 18, 2026 · Frank Klein: largest sale, Aug 24, 2026 · Alexander Slusky: largest sale, May 28, 2026
Two directors sold $5.5M with no disclosed plan: Merline Saintil ($2.8M) and Jon Olson ($2.7M, 21% of holdings). The filings don't state a reason.Merline Saintil: largest such sale, Mar 6, 2026 · Jon Olson: largest such sale, Nov 20, 2025
Marvin Clevenger sold 34K shares (16% of starting holdings), but 283K more shares were added, so the stake grew (from 210K to 459K).Largest sale, Aug 24, 2026

Percentages cover 7 of 13 officers and directors. 6 are left out

Left out: Peter Beck (holdings couldn't be fully reconciled); Adam Spice, Merline Saintil and Edward Frank (most of their shares vested during the period, so a percentage would mislead); Matthew Ocko (most holdings were last confirmed in 2021); Agostino Ricupati (held no vested shares at the start).

Disclosed company stock is not an insider's whole wealth.

The evidence

Who sold11 officers and directors: amount, % of holdings, trading plan

Who sold	Amount	% of holdings	Trading plan
Peter Beck CEO, Director	$430M 5.81M shares	i No percentage: holdings couldn't be fully reconciled.	99.8% under a disclosed plan
Adam Spice Chief Financial Officer	$138M 1.84M shares	i No percentage: most of their shares vested during the period, so a percentage would mislead.	98% under a disclosed plan
Arjun Kampani SVP & General Counsel	$33.5M 316K shares	65%	68% under a disclosed plan
Frank Klein Chief Operations Officer	$32.2M 390K shares	30%	95% under a disclosed plan
Alexander Slusky Director	$25.7M 200K shares	26%	No plan disclosed
Merline Saintil Director	$12.8M 162K shares	i No percentage: most of their shares vested during the period, so a percentage would mislead.	78% under a disclosed plan
Jon Olson Director	$5.1M 91K shares	21%	47% under a disclosed plan
Marvin Clevenger President, Rocket Lab USA, Inc	$3.8M 34K shares	16%	28% under a disclosed plan
Nina Armagno Director	$1.9M 27K shares	20%	Disclosed plan
Edward Frank Director	$193K 2.5K shares	i No percentage: most of their shares vested during the period, so a percentage would mislead.	No plan disclosed
Agostino Ricupati VP Corp Controller & CAO	$47K 669 shares	i No percentage: held no vested shares at the start.	No plan disclosed

Outside holder, reported separately: KHOSLA VENTURES SEED B, L.P. (a 10% owner, not part of management). No open-market sales reported in the period. Holds 37.65M shares. Latest filing

The full ownership picture12 of 13 insiders fully reconciled · 13 officers and directors

Vested shares across all share classes, held directly and through trusts, LLCs and family members, as reported on SEC Forms 3, 4 and 5. Unvested awards and options are never counted as owned shares.

Insider

Held Oct 7, 2025

Sold

Held Oct 7, 2026

Still held

Peter Beck

Holdings couldn't be fully reconciled. Balance changed with no matching transaction and no footnote: -392,155 shares on May 26, 2026 (Direct). See the filing Sales and other transactions for Peter Beck are complete.

CEO, Director

n/a

−5.81M

n/a

Vesting, gifts, unvested awards and holding lines for Peter Beck

0shares vested or exercised

0gifted (net of own trusts)

none reportedunvested awards, start → end

Includes unvested RSUs, amount not disclosed.
Additional holdings last reported more than 3 years ago are shown separately and excluded from totals.

Holdings couldn't be fully reconciled. Balance changed with no matching transaction and no footnote: -392,155 shares on May 26, 2026 (Direct). The balances below are as reported, not verified totals.

Held through	Share class	Oct 7, 2025	Oct 7, 2026
Direct includes unvested RSUs, amount not disclosed	Common Stock	789,373	491,930
Equatorial Trust	Common Stock	2,500,000	1,724,221
Equatorial Trust	Series A Convertible Participating Preferred Stock	45,951,250	40,951,250

Additional holdings last reported Aug 25, 2021, not confirmed since: 4,408,241 shares. Not included in any total or percentage on this page.

Equatorial Trust, Earnout Rights (common stock): 4,408,241 shares, last reported Aug 25, 2021

Adam Spice

Minor difference of 638 shares. Difference is under 0.5% of holdings. Includes unvested RSUs, amount not disclosed.

Chief Financial Officer

2.06M

−1.84M

1.41M

not meaningful

Vesting, gifts, unvested awards and holding lines for Adam Spice

+1.01Mshares vested or exercised

−96Kgifted (net of own trusts)

none reportedunvested awards, start → end

Includes unvested RSUs, amount not disclosed.

Held through	Share class	Oct 7, 2025	Oct 7, 2026
Direct includes unvested RSUs, amount not disclosed	Common Stock	2,057,889	1,155,967
Trust	Common Stock	0	250,000
Trusts	Common Stock	0	0

Stock options (not counted as shares):

Options held	Strike price	Expires	Intrinsic value (estimate)
2,242,511	$1.09	Aug 3, 2028	$159M

Estimate: options held × ($71.79 − strike price), using the most recent insider trade price on Form 4 (Oct 1, 2026), not a market close.

Reconciliation: minor difference of 638 shares. Difference is under 0.5% of holdings.

Frank Klein

Includes unvested RSUs, amount not disclosed.

Chief Operations Officer

1.32M

−390K

926K

70%

Vesting, gifts, unvested awards and holding lines for Frank Klein

0shares vested or exercised

0gifted (net of own trusts)

none reportedunvested awards, start → end

Includes unvested RSUs, amount not disclosed.

Held through	Share class	Oct 7, 2025	Oct 7, 2026
Direct includes unvested RSUs, amount not disclosed	Common Stock	1,316,005	925,737

Alexander Slusky

Includes unvested RSUs, amount not disclosed.

Director

780K

−200K

552K

71%

Vesting, gifts, unvested awards and holding lines for Alexander Slusky

0shares vested or exercised

−30Kgifted (net of own trusts)

none reportedunvested awards, start → end

Includes unvested RSUs, amount not disclosed.

Held through	Share class	Oct 7, 2025	Oct 7, 2026
Direct includes unvested RSUs, amount not disclosed	Common Stock	88,849	61,331
Abalone Cove LLLP	Common Stock	534,675	334,675
Trust	Common Stock	156,361	156,361

Arjun Kampani

Includes unvested RSUs, amount not disclosed.

SVP & General Counsel

490K

−316K

251K

51%

Vesting, gifts, unvested awards and holding lines for Arjun Kampani

0shares vested or exercised

0gifted (net of own trusts)

none reportedunvested awards, start → end

Includes unvested RSUs, amount not disclosed.

Held through	Share class	Oct 7, 2025	Oct 7, 2026
Direct includes unvested RSUs, amount not disclosed	Common Stock	489,629	250,917

Jon Olson

Includes unvested RSUs, amount not disclosed.

Director

436K

−91K

348K

80%

Vesting, gifts, unvested awards and holding lines for Jon Olson

0shares vested or exercised

0gifted (net of own trusts)

none reportedunvested awards, start → end

Includes unvested RSUs, amount not disclosed.

Held through	Share class	Oct 7, 2025	Oct 7, 2026
Direct includes unvested RSUs, amount not disclosed	Common Stock	436,235	348,112

Merline Saintil

Includes unvested RSUs, amount not disclosed.

Director

424K

−162K

264K

not meaningful

Vesting, gifts, unvested awards and holding lines for Merline Saintil

0shares vested or exercised

0gifted (net of own trusts)

none reportedunvested awards, start → end

Includes unvested RSUs, amount not disclosed.

Held through	Share class	Oct 7, 2025	Oct 7, 2026
Direct includes unvested RSUs, amount not disclosed	Common Stock	423,529	2,482
Trust	Common Stock	0	261,903

Marvin Clevenger

Minor difference of 589 shares. Difference is stated in footnotes (unreported vesting, exempt acquisition or transfer). Includes unvested RSUs, amount not disclosed. Unvested RSUs stated in footnotes are excluded from owned shares. Started reporting during the period; starting holdings are from the Form 3.

President, Rocket Lab USA, Inc

210K

−34K

459K

+119%

Vesting, gifts, unvested awards and holding lines for Marvin Clevenger

0shares vested or exercised

0gifted (net of own trusts)

none reportedunvested awards, start → end

Includes unvested RSUs, amount not disclosed.
Unvested RSUs stated in footnotes are excluded from owned shares.
Started reporting during the period; starting holdings are from the Form 3.

Held through	Share class	Oct 7, 2025	Oct 7, 2026
Direct includes unvested RSUs, amount not disclosed	Common Stock	209,756	458,924

Reconciliation: minor difference of 589 shares. Difference is stated in footnotes (unreported vesting, exempt acquisition or transfer).

Matthew Ocko

Most of this insider's holdings were last confirmed in 2021. Confirmed in the last three years: 173,920 shares. Not confirmed since: 818,789 shares, left out of this row. "Still held" is not shown because it would cover only the smaller, confirmed part.

Director

174K

see note

Vesting, gifts, unvested awards and holding lines for Matthew Ocko

0shares vested or exercised

0gifted (net of own trusts)

none reportedunvested awards, start → end

Additional holdings last reported more than 3 years ago are shown separately and excluded from totals.

Held through	Share class	Oct 7, 2025	Oct 7, 2026
SST Capital Management, LLC	Common Stock	164,026	164,026
Three Kingdoms Capital Partners, LP	Common Stock	9,894	9,894

Additional holdings last reported Aug 25, 2021, not confirmed since: 818,789 shares. Not included in any total or percentage on this page.

DCVC Opportunity Fund II, L.P, Earnout Rights (common stock): 582,071 shares, last reported Aug 25, 2021
Data Collective IV, L.P, Earnout Rights (common stock): 236,718 shares, last reported Aug 25, 2021

Edward Frank

Includes unvested RSUs, amount not disclosed.

Director

150K

−2.5K

145K

not meaningful

Vesting, gifts, unvested awards and holding lines for Edward Frank

0shares vested or exercised

−5Kgifted (net of own trusts)

none reportedunvested awards, start → end

Includes unvested RSUs, amount not disclosed.

Held through	Share class	Oct 7, 2025	Oct 7, 2026
Direct includes unvested RSUs, amount not disclosed	Common Stock	150,004	53,613
Trust	Common Stock	0	91,373

Nina Armagno

Includes unvested RSUs, amount not disclosed.

Director

136K

−27K

111K

82%

Vesting, gifts, unvested awards and holding lines for Nina Armagno

0shares vested or exercised

0gifted (net of own trusts)

none reportedunvested awards, start → end

Includes unvested RSUs, amount not disclosed.

Held through	Share class	Oct 7, 2025	Oct 7, 2026
Direct includes unvested RSUs, amount not disclosed	Common Stock	136,254	111,422

Kenneth Possenriede

Includes unvested RSUs, amount not disclosed.

Director

94K

97K

no sales

Vesting, gifts, unvested awards and holding lines for Kenneth Possenriede

0shares vested or exercised

0gifted (net of own trusts)

none reportedunvested awards, start → end

Includes unvested RSUs, amount not disclosed.

Held through	Share class	Oct 7, 2025	Oct 7, 2026
Direct includes unvested RSUs, amount not disclosed	Common Stock	94,178	96,660

Agostino Ricupati

Includes unvested RSUs, amount not disclosed.

VP Corp Controller & CAO

−669

27K

not meaningful

Vesting, gifts, unvested awards and holding lines for Agostino Ricupati

0shares vested or exercised

0gifted (net of own trusts)

none reportedunvested awards, start → end

Includes unvested RSUs, amount not disclosed.

Held through	Share class	Oct 7, 2025	Oct 7, 2026
Direct includes unvested RSUs, amount not disclosed	Common Stock	0	26,863

12 of 13 insiders fully reconciled: starting holdings plus reported transactions match ending holdings (10 exactly, 2 with a minor or footnoted difference). For 1 we show sales but not holdings; the ! icon on that row explains why. Percentages cover 7 of 13 officers and directors. Left out: Peter Beck (holdings couldn't be fully reconciled); Adam Spice, Merline Saintil and Edward Frank (most of their shares vested during the period, so a percentage would mislead); Matthew Ocko (most holdings were last confirmed in 2021); Agostino Ricupati (held no vested shares at the start). "Still held" compares ending with starting vested shares; a plus sign means the holding grew.

What explains the selling$683M of sales by plan status, purpose, seller and month

Officer and director open-market sales: $683M across 8,880,247 shares. Plan status and stated purpose are separate questions, and a sale can have both.

By plan status

Disclosed plan · $633M · 93%

The lighter segment is sales with no plan disclosed in the filing ($49.9M), including tax-related sales outside a plan.

No plan disclosed · $41.5M

Sales with no 10b5-1 plan and no tax reference in the filing. $25.7M of it is Alexander Slusky. No plan disclosed is a statement about the filing, not about why the sale happened. Largest such sale: Arjun Kampani, Jun 18, 2026

Taxes

$44.0M of sales (6.4%) cite tax obligations in their footnotes, $35.6M of them also under a plan. Example: Agostino Ricupati, Aug 24, 2026

Charitable gifts · 10K shares

Gifts the filings describe as charitable. Gifts are not sales and are not included in the sale totals.

Seller	Shares sold	Proceeds	Under a disclosed plan	Share of total	Sales dates
Peter Beck CEO, Director	5.81M	$430M	99.8%	63%	Nov 24, 2025 to Jul 8, 2026
Adam Spice Chief Financial Officer	1.84M	$138M	98%	20%	Nov 22, 2025 to Oct 1, 2026
Arjun Kampani SVP & General Counsel	316K	$33.5M	68%	5%	Nov 24, 2025 to Aug 27, 2026
Frank Klein Chief Operations Officer	390K	$32.2M	95%	5%	Nov 24, 2025 to Aug 27, 2026
Alexander Slusky Director	200K	$25.7M	0%	4%	May 12, 2026 to Jun 2, 2026
Merline Saintil Director	162K	$12.8M	78%	2%	Dec 4, 2025 to Mar 6, 2026
Jon Olson Director	91K	$5.1M	47%	0.8%	Nov 20, 2025 to Jan 20, 2026
Marvin Clevenger President, Rocket Lab USA, Inc	34K	$3.8M	28%	0.6%	May 26, 2026 to Aug 24, 2026
Nina Armagno Director	27K	$1.9M	100%	0.3%	Dec 19, 2025 to Dec 19, 2025
Edward Frank Director	2.5K	$193K	0%	0.0%	Dec 23, 2025 to Dec 23, 2025
Agostino Ricupati VP Corp Controller & CAO	669	$47K	0%	0.0%	Aug 24, 2026 to Aug 24, 2026

Sales by month

Monthly figures as a table

Month	Sale proceeds
Oct 2025	$0
Nov 2025	$9.5M
Dec 2025	$146M
Jan 2026	$121M
Feb 2026	$0
Mar 2026	$16.5M
Apr 2026	$0
May 2026	$62.0M
Jun 2026	$14.4M
Jul 2026	$286M
Aug 2026	$8.3M
Sep 2026	$8.8M
Oct 2026	$9.9M

Is this normal? Selling year by year5 earlier years to compare with

More than usual: about 2.5x the 5-year average. 11 insiders sold; the average is 4 a year.

12 months ending	Shares sold	Insiders who sold	Proceeds
Oct 7, 2026 Latest 12 months	8.88M	11	$683M
Oct 7, 2025 1 year earlier	12.45M	9	$406M
Oct 7, 2024 2 years earlier	399K	3	$2.1M
Oct 8, 2023 3 years earlier	4.11M	4	$22.6M
Oct 8, 2022 4 years earlier	712K	4	$4.0M
Oct 8, 2021 5 years earlier	0	0	$0

Open-market sales (Form 4 code S) by people who were officers or directors, in split-adjusted shares. Earlier years include people who have since left. Shares, not dollars, are compared, so a change in the stock price doesn't look like a change in selling. Years the filings don't fully cover are shown but left out of the average.

Known gaps and uncertainty1 insider whose holdings couldn't be fully reconciled

Peter Beck: holdings couldn't be fully reconciled (difference of -392,155 shares). Balance changed with no matching transaction and no footnote: -392,155 shares on May 26, 2026 (Direct). Filing, May 26, 2026

Adam Spice: minor difference of 638 shares. Difference is under 0.5% of holdings.

Marvin Clevenger: minor difference of 589 shares. Difference is stated in footnotes (unreported vesting, exempt acquisition or transfer).

Inferred rename: "Khosla Ventures Seed B" is treated as the same holder as "KV Seed B", because the old name was never reported again and the new one opened with the same balance (3,051,809 shares). Old name, new name

Inferred rename: "On May 29, 2026, the Reporting Person transferred 62,724 shares of the Registrant's common stock to trusts" is treated as the same holder as "Trusts", because the old name was never reported again and the new one opened with the same balance (62,724 shares). Old name, new name

External context: we only cite outside events when a documented connection exists. None is shown for this period.

Sources and methodology210 filings from SEC EDGAR, and how we read them

All 210 Forms 3, 4 and 5 filed for Rocket Lab Corp (SEC CIK 1819994) from Sep 24, 2020 to Oct 2, 2026, retrieved from SEC EDGAR on Oct 7, 2026. Prices are the ones reported in each filing, often weighted averages.

Holdings. Each holding line (a share class plus an owner, such as a trust or LLC) carries its last reported balance forward. Entities first reported during the period start at zero, so transfers between an insider's own trusts don't count as selling. Lines not reported for three years or more are listed separately and left out of totals.

Sales. A sale counts as under a 10b5-1 plan if its footnote cites one or the filing's Rule 10b5-1 box is checked, and as tax-related if its footnote cites tax obligations or sell-to-cover. Shares withheld by the company for taxes are listed separately. Sales with neither attribute are labeled "no plan disclosed".

Full methodology

Former or inactive filers (10)No filing in 18 months; last reported balances, not in any total

Name	Last filed	Last reported balance
Michael Griffin	Aug 26, 2024	42,353 shares, last reported balance as of Aug 22, 2024
Sven Strohband	May 13, 2024	324,341 shares, last reported balance as of May 9, 2024
Bessemer Venture Partners VIII L.P.	Nov 18, 2022	63,605,491 shares, last reported balance as of Nov 16, 2022
Shaun O'Donnell	Sep 15, 2022	720,088 shares, last reported balance as of Sep 13, 2022
David Cowan	Jun 27, 2022	493,394 shares, last reported balance as of Jun 23, 2022
Vector Acquisition Partners, L.P.	Oct 21, 2020	7,950,000 shares, last reported balance as of Oct 20, 2020
David Kennedy	Sep 24, 2020	25,000 shares, last reported balance as of Sep 24, 2020
John Herr	Sep 24, 2020	25,000 shares, last reported balance as of Sep 24, 2020
David Baylor		No balance on record
David Fishman		No balance on record

Rocket Lab Corp insiders sold $683M. How much of their stake is that?

What stands out

The evidence

No plan disclosed · $41.5M

Taxes

Charitable gifts · 10K shares

Sales by month