Director Stephen Webber buys 2,500 CSP Inc. (CSPI) shares

Rhea-AI Filing Summary

CSP Inc. director Stephen J. Webber reported an open-market purchase of the company’s common stock. On May 12, 2026, he bought 2,500 shares at $9.48 per share. After this transaction, he directly holds 12,500 common shares, indicating a modest increase in his personal investment in the company.

Insider Trade Summary

Net Buyer: 2,500 shares ($23,700)

Net Buy 1 txn

Insider Webber Stephen J.

Role null

Bought 2,500 shs ($24K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	2,500	$9.48	$24K

Holdings After Transaction: Common Stock — 12,500 shares (Direct, null)

Footnotes (1)

Key Figures

Shares purchased: 2,500 shares Purchase price: $9.48 per share Shares held after transaction: 12,500 shares +1 more

4 metrics

Shares purchased 2,500 shares Open-market purchase on May 12, 2026

Purchase price $9.48 per share Price for CSP Inc. common stock in this transaction

Shares held after transaction 12,500 shares Total direct holdings after the purchase

Net buy shares 2,500 shares Net buying reported in transaction summary

Key Terms

open-market purchase, Common Stock, transaction_code "P", direct ownership

4 terms

open-market purchase financial

"transaction_action: "open-market purchase""

An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.

Common Stock financial

"security_title: "Common Stock""

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

transaction_code "P" financial

"transaction_code: "P" for purchase in open market"

direct ownership financial

"ownership_type: "direct", ownership_code: "D""

Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Webber Stephen J.

(Last) (First) (Middle)

CSP INC.

175 CABOT ST STE 210

(Street)

LOWELL MASSACHUSETTS 01854

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
CSP INC /MA/ [ CSPI ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/12/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	05/12/2026		P		2,500	A	$9.48	12,500	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

	Stephen J Webber	05/13/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did CSP Inc. (CSPI) disclose for Stephen J. Webber?

CSP Inc. disclosed that director Stephen J. Webber made an open-market purchase of common stock. He bought 2,500 shares on May 12, 2026, increasing his direct holdings to 12,500 shares after the transaction was completed.

How many CSP Inc. (CSPI) shares did Stephen J. Webber buy and at what price?

Stephen J. Webber bought 2,500 CSP Inc. common shares in an open-market transaction. The reported purchase price was $9.48 per share, as shown in the Form 4 transaction data for May 12, 2026.

What are Stephen J. Webber’s CSP Inc. (CSPI) holdings after this Form 4 transaction?

After the reported purchase, Stephen J. Webber directly holds 12,500 shares of CSP Inc. common stock. This figure reflects his total direct ownership immediately following the 2,500-share open-market purchase on May 12, 2026.

Was the CSP Inc. (CSPI) transaction by Stephen J. Webber a buy or a sell?

The transaction was a buy. The Form 4 shows transaction code P, classified as an open-market purchase of common stock, with no reported sales or dispositions in this specific insider filing.

Is Stephen J. Webber a director or officer of CSP Inc. (CSPI) in this filing?

In this insider report, Stephen J. Webber is identified as a director of CSP Inc. He is not listed as an officer or ten-percent owner, and the purchased common shares are reported as direct ownership.

Does Stephen J. Webber’s CSP Inc. (CSPI) transaction involve derivatives or only common stock?

The reported transaction involves only common stock. The filing shows a non-derivative open-market purchase and an empty derivativeSummary, indicating no options, warrants, or other derivative securities in this specific Form 4 record.