Dropbox officer plans Rule 144 stock sales

An officer of Dropbox, Inc. filed a Form 144 notice covering stock acquired from RSU vesting and reported prior 10b5-1 plan sales of small share blocks.

Rhea-AI Filing Summary

DROPBOX, INC. (DBX) received a Form 144 notice from officer Sarah Schubach regarding potential sales of common stock under Rule 144. The shares were acquired through vesting of restricted stock units on May 15, 2026 and August 15, 2026, and sales are through Morgan Stanley Smith Barney LLC on NASDAQ.

The notice lists prior 10b5-1 plan sales over the past three months, including several small transactions between June 30, 2026 and August 31, 2026, each for roughly 1,300–1,600 shares of Dropbox common stock, with aggregate proceeds in the tens of thousands of dollars per transaction.

Key Figures

10b5-1 sale shares (August 31, 2026): 1,631 shares Sale proceeds (August 31, 2026): $57,900.50 10b5-1 sale shares (August 20, 2026): 1,631 shares +5 more

8 metrics

10b5-1 sale shares (August 31, 2026) 1,631 shares Dropbox common stock sold under a 10b5-1 plan on August 31, 2026

Sale proceeds (August 31, 2026) $57,900.50 Aggregate amount for 1,631 Dropbox shares sold on August 31, 2026

10b5-1 sale shares (August 20, 2026) 1,631 shares Dropbox common stock sold under a 10b5-1 plan on August 20, 2026

Sale proceeds (August 20, 2026) $55,470.31 Aggregate amount for 1,631 Dropbox shares sold on August 20, 2026

10b5-1 sale shares (July 31, 2026) 1,632 shares Dropbox common stock sold under a 10b5-1 plan on July 31, 2026

Sale proceeds (July 31, 2026) $51,587.52 Aggregate amount for 1,632 Dropbox shares sold on July 31, 2026

10b5-1 sale shares (July 15, 2026) 1,306 shares Dropbox common stock sold under a 10b5-1 plan on July 15, 2026

Sale proceeds (July 15, 2026) $39,349.78 Aggregate amount for 1,306 Dropbox shares sold on July 15, 2026

Key Terms

Rule 144, restricted stock units, 10b5-1, Form 144, +1 more

5 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

restricted stock units financial

"The securities to be sold were acquired upon the vesting of restricted stock units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

10b5-1 regulatory

"10b5-1 Sales for SARAH SCHUBACH 50 Hawthorne Street San Francisco CA 94105"

A 10b5-1 plan is a pre-set schedule that lets company insiders buy or sell shares according to written instructions made when they do not possess material, nonpublic information. Think of it as a timed automatic payment for stock trades: it helps insiders avoid accusations of trading on secret information and gives outside investors a clearer signal about whether sales are routine or potentially informative about the company’s prospects.

Form 144 regulatory

"144: Filer Information"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

common financial

"Common | Morgan Stanley Smith Barney LLC Executive Financial Services"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does the Form 144 filing mean for DROPBOX, INC. (DBX)?

The Form 144 shows officer Sarah Schubach has notified of planned sales of Dropbox common stock under Rule 144. The shares were acquired from RSU vesting on May 15, 2026 and August 15, 2026, and sales are to be executed through a broker on NASDAQ.

Who is selling Dropbox (DBX) shares and how were they acquired?

Officer Sarah Schubach is the person for whose account the Dropbox shares may be sold. The filing states the securities to be sold were acquired upon the vesting of restricted stock units on May 15, 2026 and August 15, 2026.

What 10b5-1 plan sales of DBX stock were reported in the last 3 months?

The filing lists 10b5-1 sales by Sarah Schubach of Dropbox common stock on June 30, July 15, July 31, August 20, and August 31, 2026, with each trade covering about 1,300–1,600 shares and aggregate sale amounts between roughly $35,000 and $58,000.

On what market are the reported Dropbox (DBX) shares traded?

The Form 144 identifies the securities as Dropbox common stock traded on NASDAQ, with sales executed through Morgan Stanley Smith Barney LLC Executive Financial Services in New York.

When was the Form 144 notice for DBX dated?

The Date of Notice on the Form 144 is September 15, 2026. The filing also references earlier activity dated June 4, 2026 in the signature/notice area.

What type of Dropbox (DBX) security is involved in this Form 144?

The Form 144 covers common stock of DROPBOX, INC. The securities were obtained upon the vesting of restricted stock units, and past sales under a 10b5-1 trading plan relate to this same class of common stock.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/15/2026 - 04:26 PM Accepted by SEC EDGAR 09/15/2026 - 04:25 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0002075704
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	DROPBOX INC
SEC File Number	001-38434
Address of Issuer	50 Hawthorne Street San Francisco CALIFORNIA 94105
Phone	4159307766
Name of Person for Whose Account the Securities are To Be Sold	SARAH SCHUBACH
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	2025	75552.75	150561680	09/15/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	05/15/2026	Restricted Stock Units	Issuer			2025	05/15/2026	N/A

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
10b5-1 Sales for SARAH SCHUBACH 50 Hawthorne Street San Francisco CA 94105	Common	08/31/2026	1631	57900.50
10b5-1 Sales for SARAH SCHUBACH 50 Hawthorne Street San Francisco CA 94105	Common	08/20/2026	1631	55470.31
10b5-1 Sales for SARAH SCHUBACH 50 Hawthorne Street San Francisco CA 94105	Common	07/31/2026	1632	51587.52
10b5-1 Sales for SARAH SCHUBACH 50 Hawthorne Street San Francisco CA 94105	Common	07/15/2026	1306	39349.78
10b5-1 Sales for SARAH SCHUBACH 50 Hawthorne Street San Francisco CA 94105	Common	06/30/2026	1305	35378.55

144: Remarks and Signature

Remarks	The securities to be sold were acquired upon the vesting of restricted stock units on 05/15/2026 and 08/15/2026.
Date of Notice	09/15/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	06/04/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Sarah Schubach
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)