Rubrik (RBRK) CTO logs 38,460-share 10b5-1 sale but keeps large stake
Filing Impact
Filing Sentiment
Form Type
4
Rhea-AI Filing Summary
Rubrik, Inc. director and CTO Nithrakashyap Arvind reported a series of open-market sales of Class A Common Stock totaling 38,460 shares over July 6–8, 2026, at reported prices generally in the mid-to-high $80s per share. These sales were made under a pre-arranged Rule 10b5-1 trading plan adopted on October 15, 2025.
At the end of the reported period, he held 316,431 shares of Class A Common Stock directly and 200,000 shares of Class B Common Stock indirectly through a revocable trust. Each Class B share is convertible into one Class A share at any time and automatically converts upon certain transfers.
Positive
- None.
Negative
- None.
Insights
CTO’s Form 4 shows pre-planned stock sales with sizeable remaining holdings.
Rubrik Chief Technology Officer and director Nithrakashyap Arvind reported net open-market sales of 38,460 Class A shares, executed across July 6–8, 2026. Individual sale prices include $83.37, $88.69, and $89.28 per share, indicating activity around the stock’s recent trading levels.
The filing shows three “C” code derivative conversions totaling 38,460 shares, paired with an equal number of Class A shares acquired from Class B Common Stock. This creates a conversion-and-sell pattern: Class B converts into Class A, then Class A is sold into the market.
A key footnote states the sales were effected under a Rule 10b5-1 trading plan adopted on October 15, 2025, meaning the trades were pre-scheduled rather than opportunistic. Following these transactions, Arvind still holds 316,431 Class A shares directly and 200,000 Class B shares indirectly through a revocable trust, each Class B share being convertible one-for-one into Class A. This combination suggests a routine liquidity event with a substantial continuing ownership stake.
Insider Trade Summary 10b5-1
Net Seller: 38,460 shares ($3,332,421)
Net Sell
23 txns
Insider
Nithrakashyap Arvind
Role
Chief Technology Officer
Sold
38,460 shs ($3.33M)
| Type | Security | Shares | Price | Value |
|---|---|---|---|---|
| Conversion | Class B Common Stock | 12,820 | $0.00 | -- |
| Conversion | Class A Common Stock | 12,820 | $0.00 | -- |
| Sale | Class A Common Stock | 6,728 | $84.02 | $565K |
| Sale | Class A Common Stock | 4,233 | $84.87 | $359K |
| Sale | Class A Common Stock | 1,446 | $85.67 | $124K |
| Sale | Class A Common Stock | 413 | $86.81 | $36K |
| Conversion | Class B Common Stock | 12,820 | $0.00 | -- |
| Conversion | Class A Common Stock | 12,820 | $0.00 | -- |
| Sale | Class A Common Stock | 749 | $85.44 | $64K |
| Sale | Class A Common Stock | 1,821 | $86.45 | $157K |
| Sale | Class A Common Stock | 4,957 | $87.32 | $433K |
| Sale | Class A Common Stock | 3,978 | $88.33 | $351K |
| Sale | Class A Common Stock | 1,315 | $89.13 | $117K |
| Conversion | Class B Common Stock | 12,820 | $0.00 | -- |
| Conversion | Class A Common Stock | 12,820 | $0.00 | -- |
| Sale | Class A Common Stock | 192 | $83.37 | $16K |
| Sale | Class A Common Stock | 257 | $85.04 | $22K |
| Sale | Class A Common Stock | 562 | $85.56 | $48K |
| Sale | Class A Common Stock | 665 | $86.91 | $58K |
| Sale | Class A Common Stock | 6,754 | $87.66 | $592K |
| Sale | Class A Common Stock | 4,129 | $88.69 | $366K |
| Sale | Class A Common Stock | 261 | $89.28 | $23K |
| holding | Class B Common Stock | -- | -- | -- |
Holdings After Transaction:
Class B Common Stock — 10,094,852 shares (Direct, null);
Class A Common Stock — 316,431 shares (Direct, null);
Class B Common Stock — 200,000 shares (Indirect, By Arvind Nithrakashyap, as Trustee of the Nithrakashyap Chatterjee Revocable Trust)
Footnotes (1)
- This sale reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan, adopted October 15, 2025. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $83.22 to $83.415 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separated price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $84.8725 to $85.1475 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separated price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $85.305 to $86.02 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separated price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $86.38 to $87.195 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separated price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $87.22 to $88.215 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separated price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $88.22 to $89.215 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separated price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $89.235 to $89.31 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separated price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $84.825 to $85.82 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separated price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $85.825 to $86.81 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separated price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $86.825 to $87.8225 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separated price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $87.825 to $88.7625 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separated price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $88.85 to $89.525 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separated price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $83.405 to $84.38 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separated price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $84.4075 to $85.39 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separated price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $85.405 to $86.325 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separated price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $86.6075 to $87.26 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separated price within the range set forth in this footnote. Each share of Class B Common Stock held by the Reporting Person will automatically convert into one share of Class A Common Stock upon the sale or transfer of such share of Class B Common Stock, subject to certain exceptions, and in certain other circumstances described in the Issuer's amended and restated certificate of incorporation. Each share of Class B Common Stock is also convertible at any time at the option of the Reporting Person into one share of Class A Common Stock and has no expiration date. The shares are held of record by Arvind Nithrakashyap, as Trustee of the Nithrakashyap/Chatterjee Revocable Trust, for which the Reporting Person serves as trustee and shares voting and dispositive power with his spouse.
Key Figures
Shares sold: 38,460 shares
Conversion shares: 38,460 shares
Post-transaction Class A holding: 316,431 shares
+4 more
7 metrics
Shares sold
38,460 shares
Total Class A shares sold July 6–8, 2026
Conversion shares
38,460 shares
Class B to Class A conversions (code C) in period
Post-transaction Class A holding
316,431 shares
Direct Class A Common Stock after reported transactions
Indirect Class B holding
200,000 shares
Class B Common Stock held via revocable trust
Example sale price
$89.28 per share
Class A sale on July 6, 2026
Example sale price
$83.37 per share
Class A sale on July 6, 2026
10b5-1 plan adoption date
October 15, 2025
Rule 10b5-1 trading plan governing these sales
Key Terms
Rule 10b5-1 trading plan, weighted average price, Class B Common Stock, convertible, +1 more
5 terms
Rule 10b5-1 trading plan regulatory
"This sale reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan, adopted October 15, 2025"
A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.
weighted average price financial
"The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions"
Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.
Class B Common Stock financial
"Each share of Class B Common Stock held by the Reporting Person will automatically convert into one share of Class A Common Stock"
A class B common stock is one of multiple types of a company’s ordinary shares that carries specific rights—often different voting power or dividend priority—compared with other classes. For investors it matters because those differences affect how much influence you have over company decisions, the income you might receive, and how freely the shares trade; think of it like owning a car with different keys: some keys let you start the engine and open the trunk, others only unlock the door.
convertible financial
"Each share of Class B Common Stock is also convertible at any time at the option of the Reporting Person into one share of Class A Common Stock"
A convertible is a type of investment that starts as a loan or preferred stake (like a bond or preferred share) but can be exchanged for common shares of the company at a set price or under certain conditions. It matters to investors because it offers a mix of steady income and downside protection like a loan, plus the upside of stock ownership if the company does well—similar to holding a coupon that you can trade for a full ticket if the event becomes valuable.
dispositive power regulatory
"for which the Reporting Person serves as trustee and shares voting and dispositive power with his spouse"
Dispositive power is the authority to decide the final outcome of an asset, legal claim, contract, or corporate action — in effect the power to dispose of or resolve something. For investors it matters because whoever holds that authority can determine who gets paid, who controls an asset or vote, and how risks and returns are allocated; think of it like holding the key that lets you lock in the winner or loser in a deal.
FAQ
What did Rubrik (RBRK) CTO Nithrakashyap Arvind report in this Form 4?
He reported multiple open-market sales of Rubrik Class A Common Stock totaling 38,460 shares over July 6–8, 2026. The trades occurred at various prices in the $80s per share and were paired with conversions of Class B shares into Class A shares.
Were Nithrakashyap Arvind’s Rubrik (RBRK) stock sales pre-planned?
Yes. A footnote states the sales were effected under a Rule 10b5-1 trading plan adopted on October 15, 2025. Such plans schedule trades in advance, making the timing more mechanical and reducing the informational value of when the transactions occurred.
What Rubrik (RBRK) stake does Nithrakashyap Arvind hold after these transactions?
After the reported transactions, he holds 316,431 shares of Class A Common Stock directly. He also holds 200,000 shares of Class B Common Stock indirectly through a revocable trust, and each Class B share is convertible into one Class A share under the company’s charter terms.
What is the significance of Rubrik’s Class B Common Stock in this Form 4?
The filing shows Class B shares converting into Class A shares using transaction code C. A footnote explains each Class B share converts automatically into one Class A share upon certain transfers and can be converted at any time at the holder’s option, with no expiration date.