ACNB director granted 210.5989 shares at $65.29

ACNB CORP reported that director Donald Arthur Seibel Jr received a grant of 210.5989 shares of ACNB Corporation Common on September 15, 2026 as compensation for board service under a director compensation plan, at a reference value of $65.29 per share.

Rhea-AI Filing Summary

ACNB CORP reported that director Donald Arthur Seibel Jr received a grant of 210.5989 shares of ACNB Corporation Common on September 15, 2026 as compensation for board service under a director compensation plan, at a reference value of $65.29 per share.

After this award, he holds 5,524.5921 shares directly and 13,002.7338 shares indirectly through a trust, which includes shares acquired via automatic dividend reinvestment under ACNB's Dividend Reinvestment and Stock Purchase Plan. No Rule 10b5-1 trading plan is reported.

Insider Trade Summary

Grant/Award: 210.5989 shares

Grant/Award 2 txns

Insider Seibel Donald Arthur Jr

Role Director

Type	Security	Shares	Price	Value
Grant/Award	ACNB Corporation Common F1, F2, F3	210.5989	$65.29	$14K
holding	ACNB Corporation Common F3	--	--	--

Holdings After Transaction: ACNB Corporation Common — 5,524.5921 shares (Direct); ACNB Corporation Common — 13,002.7338 shares (Indirect, Trust)

Footnotes (3)

1. F1. The date of execution was determined in accordance with SEC Rule 16a-3(g)(2) and (g)(4).
2. F2. The shares represent stock received as compensation for service as a director pursuant to a director compensation plan.
3. F3. This amount includes shares of common stock purchased for the same transaction date through the automatic reinvestment of dividends under the ACNB Corporation Dividend Reinvestment and Stock Purchase Plan, which are exempt from the reporting requirements of Section 16 of the Securities Exchange Act of 1934.

Key Figures

Shares granted: 210.5989 shares Reference price per share: $65.29 per share Direct holdings after transaction: 5,524.5921 shares +1 more

4 metrics

Shares granted 210.5989 shares Stock compensation grant to director on September 15, 2026

Reference price per share $65.29 per share Value associated with the September 15, 2026 share grant

Direct holdings after transaction 5,524.5921 shares Director’s direct ownership of ACNB Corporation Common after the grant

Indirect trust holdings after transaction 13,002.7338 shares Shares held indirectly through a trust, including dividend reinvestment purchases

Key Terms

director compensation plan, Dividend Reinvestment and Stock Purchase Plan, Section 16 of the Securities Exchange Act of 1934, Rule 16a-3(g)(2)

4 terms

director compensation plan financial

"stock received as compensation for service as a director pursuant to a director compensation plan"

Dividend Reinvestment and Stock Purchase Plan financial

"through the automatic reinvestment of dividends under the ACNB Corporation Dividend Reinvestment and Stock Purchase Plan"

A dividend reinvestment and stock purchase plan lets investors automatically use cash dividends to buy additional shares and often make extra share purchases directly from the company, usually at low or no commission. Think of it as an automatic savings plan for stock: dividends and optional contributions are turned into more shares, helping ownership grow through compounding and making regular investing simple and low-cost—key for long-term investors.

Section 16 of the Securities Exchange Act of 1934 regulatory

"exempt from the reporting requirements of Section 16 of the Securities Exchange Act of 1934"

A provision of federal securities law that requires company insiders—directors, officers and large shareholders—to publicly report their stock holdings and trades and to surrender any “short-swing” profits from purchases and sales within a six-month window. It acts like a rule that forces leaders to announce their trades and prevents quick buy-sell windfalls, giving investors transparency into insider activity and reducing opportunities for unfair gain.

Rule 16a-3(g)(2) regulatory

"date of execution was determined in accordance with SEC Rule 16a-3(g)(2) and (g)(4)"

FAQ

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

What insider transaction did ACNB (ACNB) report for Donald Arthur Seibel Jr?

ACNB reported that director Donald Arthur Seibel Jr received a grant of 210.5989 shares of ACNB Corporation Common on September 15, 2026 as stock compensation for his service as a director under a director compensation plan.

How many ACNB (ACNB) shares does Donald Arthur Seibel Jr hold directly after this filing?

Following the September 15, 2026 grant, Donald Arthur Seibel Jr holds 5,524.5921 shares of ACNB Corporation Common in his direct ownership account, according to the reported post-transaction holdings.

What are Donald Arthur Seibel Jr’s indirect ACNB (ACNB) share holdings?

In addition to his direct shares, Donald Arthur Seibel Jr reports 13,002.7338 shares of ACNB Corporation Common held indirectly through a trust, which includes shares purchased via automatic dividend reinvestment.

Was the ACNB (ACNB) director’s share acquisition under a Rule 10b5-1 trading plan?

No. The filing’s Rule 10b5-1 checkbox is not affirmed, and no footnote states that the September 15, 2026 stock compensation grant was made pursuant to a Rule 10b5-1 or other pre-arranged trading plan.

How were some of the ACNB (ACNB) shares in this filing acquired?

A footnote states that the reported amounts include shares purchased on the same transaction date through automatic reinvestment of dividends under the ACNB Corporation Dividend Reinvestment and Stock Purchase Plan, which are exempt from Section 16 reporting requirements.

What price per share is associated with the ACNB (ACNB) director’s stock grant?

The grant of 210.5989 shares of ACNB Corporation Common for Donald Arthur Seibel Jr is associated with a reference value of $65.29 per share as reported in the transaction data for September 15, 2026.

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

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Available on EDGAR 09/17/2026 - 09:53 AM Accepted by SEC EDGAR 09/17/2026 - 09:52 AM Learn about SEC filing dates

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^*

Seibel Donald Arthur Jr

(Last) (First) (Middle)

16 LINCOLN SQUARE

(Street)

GETTYSBURG PENNSYLVANIA 17325

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
ACNB CORP [ ACNB ]

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)
09/15/2026

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
ACNB Corporation Common	09/15/2026	09/16/2026(1)	A		210.5989(2)	A	$65.29	5,524.5921(3)	D
ACNB Corporation Common								13,002.7338(3)	I	Trust

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:

1. The date of execution was determined in accordance with SEC Rule 16a-3(g)(2) and (g)(4).

2. The shares represent stock received as compensation for service as a director pursuant to a director compensation plan.

3. This amount includes shares of common stock purchased for the same transaction date through the automatic reinvestment of dividends under the ACNB Corporation Dividend Reinvestment and Stock Purchase Plan, which are exempt from the reporting requirements of Section 16 of the Securities Exchange Act of 1934.

Remarks:

	/s/ Kevin J. Hayes as POA for Donald Arthur Seibel, Jr.	09/17/2026
	** 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)