CSP Inc. (CSPI) 10% owner Joseph Nerges buys 2,207 shares

Rhea-AI Filing Summary

CSP Inc. ten percent owner Joseph R. Nerges increased his stake through a series of open-market purchases of Common Stock. On March 11–13, 2026, he bought a total of 2,207 shares at prices between $8.45 and $8.59 per share. Following these transactions, he directly owns 1,411,282 shares of CSP Inc. common stock.

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

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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^*

NERGES JOSEPH R

(Last) (First) (Middle)

1726 BUNDY ST

(Street)

SCRANTON PA 18508

(City) (State) (Zip)

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

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

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

3. Date of Earliest Transaction (Month/Day/Year)
03/11/2026

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

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

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

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	03/11/2026		P		400	A	$8.5	1,409,475	D
Common Stock	03/11/2026		P		300	A	$8.45	1,409,775	D
Common Stock	03/11/2026		P		400	A	$8.48	1,410,175	D
Common Stock	03/12/2026		P		500	A	$8.58	1,410,675	D
Common Stock	03/12/2026		P		407	A	$8.45	1,411,082	D
Common Stock	03/13/2026		P		200	A	$8.59	1,411,282	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:

Remarks:

Entered into confidentiality agreement with CSP Inc. on October 8, 2024.

	/s/ Joseph R. Nerges	03/13/2026
	** 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.

FAQ

What insider activity did CSPI report for Joseph R. Nerges on this Form 4?

CSP Inc. reported that ten percent owner Joseph R. Nerges made several open-market purchases of its common stock. Over March 11–13, 2026, he bought 2,207 shares at prices between $8.45 and $8.59 per share.

How many CSPI shares did Joseph R. Nerges buy and at what prices?

Joseph R. Nerges purchased 2,207 CSPI common shares in total. Individual trades ranged from 300 to 500 shares, at prices of $8.45, $8.48, $8.50, $8.58, and $8.59 per share in open-market transactions.

On what dates did the CSPI insider open-market purchases occur?

The open-market purchases of CSP Inc. stock occurred on March 11, 12, and 13, 2026. Multiple trades were executed on March 11 and 12, followed by an additional 200-share purchase on March 13 at $8.59 per share.

What is Joseph R. Nerges’s CSPI share ownership after these transactions?

After the reported purchases, Joseph R. Nerges directly owns 1,411,282 shares of CSP Inc. common stock. This post-transaction holding figure is disclosed in the Form 4 for each transaction as his direct ownership position.

What type of transactions did the CSPI Form 4 for Joseph R. Nerges disclose?

All reported transactions were non-derivative, open-market purchases of CSP Inc. common stock, coded P on the Form 4. There were no sales, option exercises, gifts, or tax-withholding entries disclosed in this filing.

Is Joseph R. Nerges a major CSPI shareholder according to this filing?

Yes. The Form 4 identifies Joseph R. Nerges as a ten percent owner of CSP Inc. He directly holds 1,411,282 common shares after the reported purchases, confirming his status as a significant shareholder.