River Global Investors builds 6.1% MaxCyte (MXCT) position with 6.53M shares

Rhea-AI Filing Summary

River Global Investors LLP has disclosed a sizable stake in MaxCyte, Inc., reporting beneficial ownership of 6,529,027 equity shares, equal to about 6.1% of the company. River Global holds sole voting and dispositive power over these shares, meaning it alone decides how they are voted and when they are sold.

The position was built using investment capital from funds managed by River Global. On May 13, 2026, the firm bought 31,000 shares at 1.115 per share and 619,000 shares at 1.1142 per share through brokers in ordinary open-market trades, reinforcing its role as a financial investor rather than a strategic partner.

Insights

Equity Ownership and Governance Analyst

River Global reports a 6.1% investment stake in MaxCyte.

River Global Investors LLP now beneficially owns 6,529,027 MaxCyte shares, representing about 6.1% of the equity. It has sole voting and dispositive power, so it alone controls how this block is voted and whether it is sold.

The stake was accumulated using investment capital from funds River Global manages, with recent purchases on May 13, 2026 at prices around 1.11 per share in ordinary open-market trades. This points to a traditional institutional investor position rather than a strategic transaction.

As a Schedule 13D holder above 5%, River Global is required to update its disclosures if its intentions or holdings materially change. Subsequent ownership updates in future company or regulatory filings may clarify whether the position remains purely investment-oriented.

Key Figures

Beneficial ownership: 6,529,027 shares Ownership percentage: 6.1% Recent trade size: 31,000 shares +3 more

6 metrics

Beneficial ownership 6,529,027 shares Shares beneficially owned by River Global Investors LLP

Ownership percentage 6.1% Percent of MaxCyte equity class represented by 6,529,027 shares

Recent trade size 31,000 shares Purchased on May 13, 2026 at 1.115 per share

Recent large trade 619,000 shares Purchased on May 13, 2026 at 1.1142 per share

Purchase price 1 1.115 per share Price for 31,000 shares on May 13, 2026

Purchase price 2 1.1142 per share Price for 619,000 shares on May 13, 2026

Key Terms

beneficially owned, sole voting power, sole dispositive power, ordinary open-market transactions, +1 more

5 terms

beneficially owned financial

"Aggregate amount beneficially owned by each reporting person 6,529,027.00"

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.

sole voting power financial

"Sole Voting Power 6,529,027.00"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

sole dispositive power financial

"Sole Dispositive Power 6,529,027.00"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

ordinary open-market transactions financial

"The transactions were effected through brokers in ordinary open-market transactions."

investment capital financial

"The Shares were acquired using investment capital of the Funds managed by the Reporting Persons."

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

MAXCYTE, INC.

(Name of Issuer)

equity

(Title of Class of Securities)

57777K106

(CUSIP Number)

Nusayhah Ghaboos
30 Coleman Street,
London, X0, EC2R 5AL
02033275025

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

05/13/2026

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

schemaVersion:

SCHEDULE 13D

CUSIP Number(s): 57777K106

1

Name of reporting person

RIVER GLOBAL INVESTORS LLP

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED KINGDOM

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 6,529,027.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 6,529,027.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

6,529,027.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

6.1 %

14

Type of Reporting Person (See Instructions)

IV

SCHEDULE 13D

Item 1.	Security and Issuer
(a)	Title of Class of Securities: equity
(b)	Name of Issuer: MAXCYTE, INC.
(c)	Address of Issuer's Principal Executive Offices: 9713 KEY WEST AVENUE,, SUITE 400, ROCKVILLE, MARYLAND , 20850.
Item 2.	Identity and Background
(a)	River Global Investors LLP
(b)	30 Coleman Street, London, EC2R 5AL, United Kingdom
(c)	Investment Firm 30 Coleman Street, London, EC2R 5AL, United Kingdom
(d)	No
(e)	No
(f)	United Kingdom
Item 3.	Source and Amount of Funds or Other Consideration
	The Shares were acquired using investment capital of the Funds managed by the Reporting Persons.
Item 4.	Purpose of Transaction
	(a) The acquisition by any person of additional securities of the issuer, or the disposition of securities of the issuer;
Item 5.	Interest in Securities of the Issuer
(a)	6,529,027 shares 6.0950% Ownership
(b)	6,529,027 shares
(c)	1) River Global Investors LLP 2) 05/13/2026 3) 31,000 shares at 1.115 and 619,000 shares at 1.1142 5) The transactions were effected through brokers in ordinary open-market transactions.
(d)	Not applicable.
(e)	Not applicable.
Item 6.	Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer
	Not applicable.
Item 7.	Material to be Filed as Exhibits.
	Not applicable.

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.

RIVER GLOBAL INVESTORS LLP

Signature:	N.Ghaboos
Name/Title:	Regulatory Oversight Manager
Date:	05/14/2026

FAQ

What percentage of MaxCyte (MXCT) does River Global Investors now own?

River Global Investors LLP reports beneficial ownership of about 6.1% of MaxCyte’s equity, or 6,529,027 shares. This makes River Global a significant institutional shareholder with a sizeable single block under its sole voting and dispositive control.

How many MaxCyte (MXCT) shares are beneficially owned by River Global Investors?

River Global Investors LLP beneficially owns 6,529,027 MaxCyte shares. These shares are held with sole voting and sole dispositive power, meaning River Global alone decides how the shares are voted and when or if they are sold.

What recent MaxCyte (MXCT) trades did River Global Investors make?

On May 13, 2026, River Global Investors LLP bought 31,000 MaxCyte shares at 1.115 per share and 619,000 shares at 1.1142. These purchases were executed through brokers in ordinary open-market transactions using investment capital from its managed funds.

What type of investor is River Global Investors in relation to MaxCyte (MXCT)?

River Global Investors LLP is described as an investment firm managing funds that acquired MaxCyte shares using investment capital. The filing states the shares were bought through ordinary open-market transactions, indicating a financial investment rather than an operating or strategic partnership.

Does River Global Investors share voting power over its MaxCyte (MXCT) stake?

River Global Investors LLP reports sole voting power over 6,529,027 MaxCyte shares and no shared voting power. It also has sole dispositive power over the same number of shares, so decisions about voting and selling rest entirely with River Global.

Where is River Global Investors, the MaxCyte (MXCT) shareholder, based?

River Global Investors LLP is based at 30 Coleman Street, London, EC2R 5AL, United Kingdom. It acts as an investment firm managing funds that have accumulated a 6.1% beneficial ownership stake in MaxCyte through open-market share purchases.