[SCHEDULE 13G/A] Jackson Acquisition Company II SEC Filing

Rhea-AI Filing Summary

T-Mobile US, Inc. (TMUS) – Form 4 insider transaction. President of the Business Group, Callie R. Field, reported the sale of 12,300 common shares on 07/29/2025 under transaction code “S.” The weighted-average sale price was $240.80 per share (range: $240.79-$240.87). After the sale, Field directly owns 110,891.114 shares of TMUS common stock. No derivative security activity or Rule 10b5-1 trading plan disclosure was indicated. The filing was signed by Attorney-in-Fact Frederick Williams on 07/31/2025.

The transaction reduces Field’s direct holdings by roughly 10% versus the pre-sale balance (123,191.114 shares) but leaves a substantial remaining position. No accompanying narrative explains motive or use of proceeds, and there were no other simultaneous insider transactions disclosed.

Positive

• None.

Negative

• President Callie R. Field sold 12,300 shares (~$3 million), reducing her holdings by ~10%, which can be viewed as a modestly negative insider-sentiment signal.

Insights

Corporate Governance Expert

TL;DR: Officer sold ~10% of holdings; modestly negative governance signal.

Insider sales by senior executives often draw scrutiny because they can hint at internal views on valuation or future performance. The 12.3k-share sale is sizable in dollar terms (~$3.0 million) but leaves Field with >110k shares, suggesting continued alignment with shareholders. Absence of a 10b5-1 plan and the concentration within a single day slightly elevate sentiment risk, though the transaction alone is not alarming given the remaining stake and lack of broader insider selling.

Portfolio Manager

TL;DR: Transaction is small relative to TMUS float; market impact immaterial.

TMUS averages multi-million-share daily volume; 12,300 shares is negligible for liquidity and unlikely to move price. Nevertheless, insider direction matters to sentiment, and this is the first reported sale by Field in 2025. I view the filing as not impactful to valuation models or target price, but I would monitor for additional selling patterns from multiple insiders before adjusting position weights.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 2)

Jackson Acquisition Co II

(Name of Issuer)

Class A ordinary shares, par value $0.0001 per share

(Title of Class of Securities)

G4992A201

(CUSIP Number)

06/30/2025

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

SCHEDULE 13G

CUSIP No. G4992A201

1

Names of Reporting Persons

BANK OF MONTREAL

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

CANADA (FEDERAL LEVEL)

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,340,200.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,340,200.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,340,200.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.62 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

CUSIP No. G4992A201

1

Names of Reporting Persons

BANK OF MONTREAL HOLDING INC.

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

CANADA (FEDERAL LEVEL)

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,340,200.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,340,200.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,340,200.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.62 %

12

Type of Reporting Person (See Instructions)

BK

SCHEDULE 13G

CUSIP No. G4992A201

1

Names of Reporting Persons

BMO NESBITT BURNS INC.

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

CANADA (FEDERAL LEVEL)

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,340,200.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,340,200.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,340,200.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.62 %

12

Type of Reporting Person (See Instructions)

BD

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Jackson Acquisition Co II
(b)	Address of issuer's principal executive offices: 2655 NORTHWINDS PARKWAY, ALPHARETTA, GEORGIA 30009
Item 2.
(a)	Name of person filing: BANK OF MONTREAL BANK OF MONTREAL HOLDING INC. BMO NESBITT BURNS INC.
(b)	Address or principal business office or, if none, residence: 1 First Canadian Place Toronto, Ontario, Canada M5X1A1
(c)	Citizenship: BANK OF MONTREAL - CANADA (FEDERAL LEVEL) BANK OF MONTREAL HOLDING INC. - CANADA (FEDERAL LEVEL) BMO NESBITT BURNS INC. - CANADA (FEDERAL LEVEL)
(d)	Title of class of securities: Class A ordinary shares, par value $0.0001 per share
(e)	CUSIP No.: G4992A201
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 1,340,200
(b)	Percent of class: 5.62 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: BANK OF MONTREAL - 0 BANK OF MONTREAL HOLDING INC. - 0 BMO NESBITT BURNS INC. - 0
	(ii) Shared power to vote or to direct the vote: BANK OF MONTREAL - 1,340,200 BANK OF MONTREAL HOLDING INC. - 1,340,200 BMO NESBITT BURNS INC. - 1,340,200
	(iii) Sole power to dispose or to direct the disposition of: BANK OF MONTREAL - 0 BANK OF MONTREAL HOLDING INC. - 0 BMO NESBITT BURNS INC. - 0
	(iv) Shared power to dispose or to direct the disposition of: BANK OF MONTREAL - 1,340,200 BANK OF MONTREAL HOLDING INC. - 1,340,200 BMO NESBITT BURNS INC. - 1,340,200
Item 5.	Ownership of 5 Percent or Less of a Class.
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. The securities reported herein are held in the ordinary course of business of the Reporting Person acting as prime broker on behalf of certain clients who have the power to direct the receipt of dividends from, or the proceeds from the sale of such securities.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. See Documents.
Item 8.	Identification and Classification of Members of the Group.
	If a group has filed this schedule pursuant to §240.13d-1(b)(1)(ii)(J), so indicate under Item 3(j) and attach an exhibit stating the identity and Item 3 classification of each member of the group. If a group has filed this schedule pursuant to §240.13d-1(c) or §240.13d-1(d), attach an exhibit stating the identity of each member of the group. Each reporting person may be deemed to be a member of a group with respect to the issuer or securities of the issuer for the purposes of Section 13(d) or 13(g) of the Act. Each reporting person declares that neither the filing of this statement nor anything herein shall be construed as an admission that such person is, for the purposes of Section13(d) or 13(g) of the Act or any other purpose, (i) acting (or has agreed or is agreeing to act) with any other person as a partnership, limited partnership, syndicate, or other group for the purpose of acquiring, holding, or disposing of securities of the issuer or otherwise with respect to the issuer or any securities of the issuer or (ii) a member of any syndicate or group with respect to the issuer or any securities of the issuer.
Item 9.	Notice of Dissolution of Group.
	Notice of dissolution of a group may be furnished as an exhibit stating the date of the dissolution and that all further filings with respect to transactions in the security reported on will be filed, if required, by members of the group, in their individual capacity. See Item 5. Each reporting person may be deemed to be a member of a group with respect to the issuer or securities of the issuer for the purposes of Section 13(d) or 13(g) of the Act. Each reporting person declares that neither the filing of this statement nor anything herein shall be construed as an admission that such person is, for the purposes of Section13(d) or 13(g) of the Act or any other purpose, (i) acting (or has agreed or is agreeing to act) with any other person as a partnership, limited partnership, syndicate, or other group for the purpose of acquiring, holding, or disposing of securities of the issuer or otherwise with respect to the issuer or any securities of the issuer or (ii) a member of any syndicate or group with respect to the issuer or any securities of the issuer.

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

BANK OF MONTREAL

Signature:	Kathryn Cenac
Name/Title:	Managing Director - Regulatory Solutions Group
Date:	07/31/2025

BANK OF MONTREAL HOLDING INC.

Signature:	Kathryn Cenac
Name/Title:	Managing Director - Regulatory Solutions Group
Date:	07/31/2025

BMO NESBITT BURNS INC.

Signature:	Kathryn Cenac
Name/Title:	Managing Director - Regulatory Solutions Group
Date:	07/31/2025

FAQ

How many TMUS shares did Callie R. Field sell?

She disposed of 12,300 common shares on 07/29/2025.

At what price were the TMUS shares sold?

The weighted-average sale price was $240.80, with trades ranging from $240.79 to $240.87.

How many TMUS shares does Callie R. Field still own after the sale?

She now directly owns 110,891.114 shares.

Was a Rule 10b5-1 trading plan disclosed for this sale?

The form does not indicate that the transaction was executed under a Rule 10b5-1(c) trading plan.

Does this Form 4 include any derivative security transactions?

No; Table II shows no activity in derivative securities.