Modsys International Ltd (MDSY): Prescott Group Capital Management Is Gobbling Up

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

SCHEDULE
13D/A

(Amendment No. 9)

(Rule 13d-101)

Under the Securities Exchange Act of 1934

Modsys
International Ltd.

(Name of Issuer)

Ordinary shares, NIS 0.01 par value

(Title of Class of Securities)

M70378100

(CUSIP NUMBER)

Phil Frohlich

1924 South Utica, Suite #1120

Tulsa, Oklahoma 74104-6429

(918) 747-3412

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

– with copies to –

Eliot D. Raffkind

Akin,
Gump, Strauss, Hauer & Feld, L.L.P.

1700 Pacific Avenue, Suite 4100

Dallas, Texas 75201-4618

(214) 969-2800

December 29, 2016

(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 which is the subject of this Schedule 13D, and is filing this schedule because of Rule 13d-1(e),
13d-1(f) or 13d-1(g) check the following box [X].

The information
required in 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, as amended (the Act), or otherwise subject to the liabilities of that
section of the Act but shall be subject to all other provisions of the Act.

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SCHEDULE 13D/A

This Amendment No. 9 (this Amendment) to the Schedule 13D (the Schedule 13D) is being filed on behalf of Prescott
Group Capital Management, L.L.C., an Oklahoma limited liability company (Prescott Capital), Prescott Group Aggressive Small Cap, L.P., an Oklahoma limited partnership (Prescott Small Cap), Prescott Group Aggressive Small Cap
II, L.P., an Oklahoma limited partnership (Prescott Small Cap II and, together with Prescott Small Cap, the Small Cap Funds), and Mr. Phil Frohlich, the principal of Prescott Capital, relating to Ordinary shares, NIS
0.01 par value (the Ordinary Shares), of Modsys International Ltd., an Israeli company (the Issuer).

The Ordinary
Shares held by Prescott Master Fund reported on this Schedule 13D were previously reported on a Schedule 13G/A filed with the Securities Exchange Commission on May 11, 2010 and a Schedule 13D filed with the Securities Exchange Commission on
June 2, 2010, as subsequently amended on January 6, 2011, again on June 27, 2011, again on December 16, 2011, again on April 27, 2012, again on September 12, 2012, again on November 26, 2013, again on
December 12, 2014 and again on January 4, 2016. Capitalized terms used herein but not defined have the respective meanings given to them in the Schedule 13D.

Item 3 of the Schedule 13D is hereby amended as follows:

As of December 30, 2016, the Small Cap Funds had
invested $17,291,524 (inclusive of brokerage commissions) in Ordinary Shares of the Issuer. The source of these funds was the working capital of the Small Cap Funds.

Item 4 of the Schedule 13D is hereby amended by adding the following:

The Reporting Persons have entered into a Share
Purchase Agreement with the Issuer dated as of December 29, 2016 (the December 2016 SPA) whereby the Reporting Persons have agreed to purchase 378,788 Ordinary Shares an aggregate purchase price of $250,000.08. The December 2016 SPA
is included as Exhibit 10.2 to the Issuers Form 8-K filed with the Securities Exchange Commission on January 4, 2017 and incorporated herein by reference.

Item 5 of the Schedule 13D is hereby amended as follows:

(a) The aggregate percentage of Ordinary
Shares reported to be owned by the Reporting Persons is based upon the sum of (i) 18,700,096 Ordinary Shares outstanding, which is the total number of Ordinary Shares outstanding as of November 8, 2016, as reported in the Issuers most
recent 10-Q filed with the Securities Exchange Commission on November 14, 2016, plus (ii) 253,689, the number of warrants exercisable to purchase Ordinary Shares held by the Reporting Persons, plus (iii)
200,000, the number of preferred shares convertible into Ordinary Shares held by the Reporting Persons, plus (iv) 378,788, the number of shares issued to the Reporting Persons pursuant to the December 2016 SPA as described in Item 4 above.

As of December 30, 2016, the Small Cap Funds beneficially owned approximately 4,849,965
Ordinary Shares, representing approximately 24.8% of the issued and outstanding Ordinary Shares of the Issuer. Such Ordinary Shares consist of (i) 4,396,276 Ordinary Shares, (ii) warrants exercisable to purchase 253,689 Ordinary Shares and
(iii) preferred shares convertible into 200,000 Ordinary Shares.

Prescott Capital, as the general partner of the Small Cap Funds,
and Mr. Frohlich, as managing member of Prescott Capital, may also be deemed to beneficially own the 4,849,965 Ordinary Shares held by the Small Cap Funds, representing approximately 24.8% of the issued and outstanding Ordinary Shares of the
Issuer.

Prescott Capital and Mr. Frohlich disclaim beneficial ownership of the Ordinary Shares held by the Small Cap Funds except to
the extent of their pecuniary interest therein.

(b) By virtue of his position with Prescott Capital and the Small Cap Funds,
Mr. Frohlich has the sole power to vote and dispose of the Ordinary Shares owned by the Small Cap Funds reported in this Schedule 13D.

The filing of this Schedule 13D shall not be construed as admission that Prescott Capital or Mr. Frohlich is for the purposes of Section
13(d) or 13(g) of the Act the beneficial owner of any of the 4,849,965 Ordinary Shares owned by the Small Cap Funds. Pursuant to Rule 13d-4, Prescott Capital and Mr. Frohlich disclaim all such beneficial
ownership.

(c) Other than the acquisitions described in Item 4 hereof, there were no transactions in the Issuers securities during
the sixty days prior to the date hereof made by the Reporting Persons.

(d) No person other than the Reporting Persons is known to have the
right to receive, or the power to direct the receipt of dividends from, or proceeds from the sale of, the Ordinary Shares.

(e) Not
applicable.

Exhibit 99.10 Share Purchase Agreement with the
Issuer dated as of December 29, 2016, incorporated by reference to Exhibit 10.2 to the Issuers Form 8-K filed with the Securities Exchange Commission on January 4, 2017.

Signatures

After reasonable inquiry and to the best of their knowledge and belief, each of the undersigned certifies that the information set forth in
this statement is true, complete and correct.

Dated: January 5, 2017