CSP Inc. (CSPI) major holder adds 4,248 shares in May buys

Rhea-AI Filing Summary

CSP Inc. ten percent owner Joseph R. Nerges reported open-market purchases of a total of 4,248 shares of CSPI common stock over several transactions on May 11–13, 2026. The reported trade prices ranged from $9.15 to $9.30 per share. Following these purchases, he directly owns 1,415,530 common shares.

Insights

Equity analyst

CSPI’s large shareholder made modest open-market share purchases.

Ten percent owner Joseph R. Nerges bought 4,248 CSPI common shares in seven open-market trades between May 11 and May 13, 2026, at prices around $9.15–$9.30 per share.

After these transactions he directly holds 1,415,530 shares, so the additional purchases represent a small incremental increase to an already large position. The filing shows only common stock trades and no derivative exercises or tax-related dispositions.

Insider Trade Summary

Net Buyer: 4,248 shares ($39,201)

Net Buy 7 txns

Insider NERGES JOSEPH R

Role null

Bought 4,248 shs ($39K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	400	$9.19	$4K
Purchase	Common Stock	500	$9.26	$5K
Purchase	Common Stock	800	$9.30	$7K
Purchase	Common Stock	200	$9.15	$2K
Purchase	Common Stock	1,500	$9.22	$14K
Purchase	Common Stock	348	$9.18	$3K
Purchase	Common Stock	500	$9.20	$5K

Holdings After Transaction: Common Stock — 1,415,030 shares (Direct, null)

Footnotes (1)

Key Figures

Total shares purchased: 4,248 shares Purchase price range: $9.15–$9.30 per share Holdings after transactions: 1,415,530 shares +3 more

6 metrics

Total shares purchased 4,248 shares Net open-market buys reported on Form 4

Purchase price range $9.15–$9.30 per share Open-market common stock purchases

Holdings after transactions 1,415,530 shares Direct CSPI common stock ownership post-trade

Number of buy transactions 7 transactions All coded P, open-market purchases

Largest single trade size 1,500 shares Open-market purchase on May 11, 2026

Smallest single trade size 200 shares Open-market purchase on May 12, 2026

Key Terms

ten percent owner, Common Stock, open-market purchase, non-derivative, +1 more

5 terms

ten percent owner financial

"the reporting person is marked as a ten percent owner of CSP Inc."

Common Stock financial

"each reported transaction involves CSP Inc. Common Stock as the security title"

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.

open-market purchase financial

"each transaction action is classified as an open-market purchase of shares"

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.

non-derivative financial

"every transaction is listed as non-derivative, involving only common stock"

transaction code financial

"all seven entries use transaction code P for purchases"

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^*

NERGES JOSEPH R

(Last) (First) (Middle)

1726 BUNDY ST

(Street)

SCRANTON PENNSYLVANIA 18508

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/11/2026

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	05/11/2026		P		1,500	A	$9.22	1,412,782	D
Common Stock	05/11/2026		P		348	A	$9.18	1,413,130	D
Common Stock	05/11/2026		P		500	A	$9.2	1,413,630	D
Common Stock	05/12/2026		P		800	A	$9.3	1,414,430	D
Common Stock	05/12/2026		P		200	A	$9.15	1,414,630	D
Common Stock	05/13/2026		P		400	A	$9.19	1,415,030	D
Common Stock	05/13/2026		P		500	A	$9.26	1,415,530	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	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 transactions did Joseph R. Nerges report for CSPI?

Joseph R. Nerges reported buying 4,248 CSPI common shares. The Form 4 shows seven open-market purchases of CSP Inc. common stock between May 11 and May 13, 2026, at prices slightly above $9 per share, increasing his direct holdings.

Over what dates did CSPI insider Joseph R. Nerges buy shares?

Nerges bought CSPI shares on May 11, 12, and 13, 2026. Across those three trading days, he executed multiple open-market purchase transactions in CSP Inc. common stock, each reported separately in the Form 4 filing with associated share counts and prices.

How many CSPI shares does Joseph R. Nerges own after these trades?

After the reported trades, Nerges owns 1,415,530 CSPI shares directly. The Form 4 discloses this post-transaction ownership figure for CSP Inc. common stock, reflecting his status as a ten percent owner of the company.

What prices did CSPI insider Joseph R. Nerges pay for his recent share purchases?

Nerges paid between $9.15 and $9.30 per CSPI share. Individual trades were reported at prices including $9.15, $9.18, $9.19, $9.20, $9.22, $9.26, and $9.30, all classified as open-market purchases of CSP Inc. common stock.

Is Joseph R. Nerges considered a major shareholder of CSPI?

Yes, Nerges is identified as a ten percent owner of CSPI. The Form 4 indicates his status as a ten percent owner of CSP Inc., and after the latest open-market purchases he directly holds 1,415,530 shares of the company’s common stock.