Unless the foreign investor's home country laws or regulations grant similar rights or privileges to citizens of the Philippines, only minority foreign-owned firms are allowed to supply the government and government-owned or controlled corporations.
"Only the investment areas and/or activities listed in the attached Eleventh Regular Foreign Investment Negative List shall be reserved for Philippine nationals, subject to the exceptions and conditions indicated therein.
[...]
LIST A: FOREIGN OWNERSHIP IS LIMITED BY MANDATE OF THE CONSTITUTION AND SPECIFIC LAWS [...]
Up to Forty Percent (40%) Foreign Equity
21. Contracts for the supply of materials, goods and commodities to government-owned or controlled corporation, company, agency or municipal corporation (Sec. 1 of R.A. No. 5183)12 [12 A contract may be awarded to any contractor or bidder who is a citizen, corporation or association of a foreign country the laws or regulations of which grant similar rights or privileges to citizens of the Philippines (Sec. 1 of R. A. No. 5183).[...]" (Eleventh Regular Foreign Investment Negative List (Executive Order No. 65 / 2018))
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"Section 1 . No contract either through a public bidding or negotiated contract for the supply to, or procurement by, any government-owned or controlled corporation, company, agency or municipal corporation of materials, equipment, goods and commodities shall be awarded to any contractor or bidder who is not a citizen of the Philippines or which is not a corporation or association at least sixty percent of the capital of which is owned by Filipino citizens, except, as to a citizen, corporation or association of a country the laws or regulations of which grant similar rights or privileges to citizens of the Philippines. In the latter case the Flag Law shall continue to be applicable" (RA 5183)
Eleventh Regular Foreign Investment Negative List (Executive Order No. 65 / 2018)
Sec. 1 of RA 5183
[<a href="https://www.officialgazette.gov.ph/downloads/2018/10oct/20181029-EO-65-RRD.pdf">List</a>],[<a href="http://www.lawphil.net/statutes/repacts/ra1967/ra_5183_1967.html">Act</a>]