Atika Capital (JATT) discloses 5.1% beneficial stake in JATT II Acquisition Corp.

Rhea-AI Filing Summary

Atika Capital Management LLC and Brad Farber report beneficial ownership of JATT II Acquisition Corp. ordinary shares. They each report beneficial ownership of 400,000 shares, representing 5.1% of the outstanding class, with no sole voting or dispositive power.

All 400,000 shares are held by advisory clients of Atika Capital Management LLC, with Atika and Farber sharing voting and dispositive power over these positions. Each underlying advisory client is stated not to beneficially own more than 5% of JATT II Acquisition Corp.’s ordinary shares.

Key Figures

Shares beneficially owned: 400,000 shares Ownership percentage: 5.1% Shares beneficially owned (Farber): 400,000 shares +3 more

6 metrics

Shares beneficially owned 400,000 shares Beneficially owned by Atika Capital Management LLC

Ownership percentage 5.1% Percent of JATT ordinary shares beneficially owned by Atika Capital Management LLC

Shares beneficially owned (Farber) 400,000 shares Beneficially owned by Brad Farber

Ownership percentage (Farber) 5.1% Percent of JATT ordinary shares beneficially owned by Brad Farber

Shared voting power 400,000 shares Shares with shared voting power for both Atika Capital and Brad Farber

Sole voting power 0 shares Shares with sole voting power for both Atika Capital and Brad Farber

Key Terms

beneficially owned, shared voting power, shared dispositive power, investment adviser, +1 more

5 terms

beneficially owned financial

"Amount beneficially owned: Atika Capital Management LLC - 400,000 Brad Farber - 400,000"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

shared voting power financial

"Shared Voting Power 400,000.00"

Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.

shared dispositive power financial

"Shared Dispositive Power 400,000.00"

investment adviser financial

"12 IA,"

An investment adviser is a person or firm that professionally manages money and gives recommendations about buying, selling, or holding investments. Like a financial coach or guide, they have a legal duty to act in a client's best financial interest, so their advice, fees and potential conflicts can directly affect returns and risk — making their role important for investors who want informed, accountable help with portfolios.

control person financial

"Exhibit B - Control Person Identification"

A control person is an individual or entity that can significantly influence a company’s decisions and direction through ownership, voting power, or contractual rights—think of them as the captain who can steer the ship. Investors care because a control person’s choices affect corporate strategy, board appointments, and transactions that can raise or lower a stock’s value, and they often carry additional legal responsibilities and disclosure requirements to protect other shareholders.

FAQ

What percentage of JATT (JATT II Acquisition Corp.) does Atika Capital Management report owning?

Atika Capital Management LLC reports beneficial ownership of 5.1% of JATT II Acquisition Corp.’s ordinary shares, representing 400,000 shares. This ownership is held through advisory client accounts over which Atika has shared voting and dispositive power.

How many JATT ordinary shares are reported as beneficially owned by Brad Farber?

Brad Farber reports beneficial ownership of 400,000 JATT ordinary shares, equal to 5.1% of the class. He has no sole voting or dispositive power but shares both voting and dispositive power over these shares with Atika Capital Management LLC.

Do Atika Capital Management and Brad Farber have sole voting power over JATT shares?

No. Both Atika Capital Management LLC and Brad Farber report 0 shares with sole voting power and 400,000 shares with shared voting power. They also report no sole dispositive power and shared dispositive power over the same 400,000 shares.

Who directly owns the JATT shares reported by Atika Capital Management LLC?

All 400,000 JATT shares reported are directly owned by advisory clients of Atika Capital Management LLC. The filing states that none of these advisory clients may be deemed to beneficially own more than 5% of JATT’s ordinary shares individually.

What types of reporting persons are Atika Capital Management LLC and Brad Farber for JATT?

Atika Capital Management LLC is classified as an investment adviser (IA), and Brad Farber is classified as a holding company/control person (HC). Both jointly report 5.1% beneficial ownership of JATT II Acquisition Corp.’s ordinary shares.

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Available on EDGAR 08/14/2026 - 07:33 AM Accepted by SEC EDGAR 08/14/2026 - 07:32 AM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

JATT II Acquisition Corp.

(Name of Issuer)

ordinary shares, par value $0.0001 per share

(Title of Class of Securities)

G50765109

(CUSIP Number)

06/30/2026

(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)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): G50765109

1

Names of Reporting Persons

Atika Capital Management LLC

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

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 400,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 400,000.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

400,000.00

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)

5.1 %

12

Type of Reporting Person (See Instructions)

IA, OO

SCHEDULE 13G

CUSIP Number(s): G50765109

1

Names of Reporting Persons

Brad Farber

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

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 400,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 400,000.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

400,000.00

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)

5.1 %

12

Type of Reporting Person (See Instructions)

HC, IN

SCHEDULE 13G

Item 1.
(a)	Name of issuer: JATT II Acquisition Corp.
(b)	Address of issuer's principal executive offices: 153 Central Avenue C/O 56 Westfield, NJ 07091
Item 2.
(a)	Name of person filing: Atika Capital Management LLC Brad Farber
(b)	Address or principal business office or, if none, residence: Atika Capital Management LLC 475 Tenth Avenue, 14th Floor New York, NY 10018 Brad Farber c/o Atika Capital Management LLC 475 Tenth Avenue, 14th Floor New York, NY 10018
(c)	Citizenship: Atika Capital Management LLC - Delaware Brad Farber - United States
(d)	Title of class of securities: ordinary shares, par value $0.0001 per share
(e)	CUSIP Number(s): G50765109
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: Atika Capital Management LLC - 400,000 Brad Farber - 400,000
(b)	Percent of class: Atika Capital Management LLC - 5.1% Brad Farber - 5.1%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: Atika Capital Management LLC - 0 Brad Farber - 0
	(ii) Shared power to vote or to direct the vote: Atika Capital Management LLC - 400,000 Brad Farber - 400,000
	(iii) Sole power to dispose or to direct the disposition of: Atika Capital Management LLC - 0 Brad Farber - 0
	(iv) Shared power to dispose or to direct the disposition of: Atika Capital Management LLC - 400,000 Brad Farber - 400,000
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
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. All of the securities reported in this Schedule 13G are directly owned by advisory clients of Atika Capital Management LLC. None of those advisory clients may be deemed to beneficially own more than 5% of the ordinary shares, par value $0.0001 per share.
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. Please see Exhibit B attached hereto.
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

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.

Atika Capital Management LLC

Signature:	/s/ Brad Farber
Name/Title:	Brad Farber, Managing Member
Date:	08/14/2026

Brad Farber

Signature:	/s/ Brad Farber
Name/Title:	BRAD FARBER
Date:	08/14/2026

Exhibit Information

Exhibit A - Joint Filing Agreement Exhibit B - Control Person Identification