(Name of Issuer)

(Title of Class of Securities)

(CUSIP Number)

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

(Date of Event Which Requires Filing of this Statement)

This statement relates to shares of Common Stock (the "Stock") of Equinix, Inc. (the "Issuer"). The principal executive office of the Issuer is located at 301 Velocity Way, Fifth Floor, Foster City, CA 94404.

The persons filing this statement and the persons enumerated in Instruction C of Schedule 13D and, where applicable, their respective places of organization, general partners, directors, executive officers and controlling persons, and the information regarding them, are as follows:

On June 5, 2003, investment funds to which Crosslink or Crossover III Management is the investment adviser and to which Crossover III Management, Ventures IV Holdings or Verwaltungs is the general partner, manager or holder of Class B Units (the "Funds") purchased from the Issuer in a private placement (the "Private Placement") (a) Series A-2 Notes Due 2007 (the "A-2 Notes") in the aggregate principal amount of $10,000,000, convertible into 2,500,000 shares of the Stock at the option of the holder, subject to adjustment on the occurrence of certain events, (b) Common Stock Warrants (the "Warrants") for the purchase of 500,000 shares of the Stock at an exercise price of $0.01 per share, (c) Series A and Series B Cash Trigger Warrants for the purchase of shares of the Stock on the terms described in Item 6, and (d) Change in Control Warrants for the purchase of shares of the Stock on the terms described in Item 6 (collectively, the "Securities"). The A-2 Notes and the Warrants are convertible into the shares of Stock reported on this Schedule 13D. On June 6, 2003, the Filers exercised the Warrants on behalf of the Funds at an exercise price of $0.01 per share. On February 27, 2004, shares of the Stock totaling 257,250 issued on the exercise of the Warrants were distributed to investors in investment funds of which Crosslink is the investment adviser and of which Ventures IV Holdings or Verwaltungs is the general partner, manager or holder of Class B Units. The source and amount of funds used in purchasing the Securities in the Private Placement and exercising the Warrants (with respect to the Stock issued on such exercise that the Filers continue to own after February 27, 2004) were as follows:

None of the Filers has any present plans or intentions to acquire or dispose of any securities of the Issuer other than on behalf of advisory clients of Crosslink or Crossover III Management for the purpose of investment. Other than as described herein, none of the Filers has any present plans or proposals which relate to, or would result in, any of the transactions or events described in Item 4 of Schedule 13D. In connection with the Private Placement, the Issuer amended its bylaws to provide that a representative of the Filers would be nominated to serve as a director of the Issuer.

Crosslink or Crossover III Management may decide to purchase at any time or times on behalf of its advisory clients additional shares of the Stock or other securities of the Issuer. Crosslink or Crossover III Management may at any time or times cause its advisory clients to dispose of any or all securities of the Issuer in any lawful manner and as permitted by the agreements and other documents governing the Securities. Crosslink and Crossover III Management reserve on behalf of their advisory clients all of such clients' rights as stockholders of the Issuer and may exercise those rights in any manner that either of them considers to be in the interests of such clients.

The beneficial ownership of the Stock by each Filer at the date hereof is reflected on that Filer's cover page.

Each of Crosslink and Crossover III Management is an investment adviser with the power to invest in, vote and dispose of the Stock on behalf of its clients. Those clients have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the Stock. No single client, other than Crossover Fund III and Ventures IV, holds more than 5% of the outstanding Stock.

Crosslink, Crossover III Management, Ventures IV Holdings, Verwaltungs, Mr. Stark, Mr. Kaufman, Mr. Jacimovic, Mr. Dunn, Mr. Bliska and Mr. Hromadko are filing this Schedule 13D jointly as a group, but disclaim membership in a group, within the meaning of Rule 13d-5(b) under the Exchange Act, with any other person not reporting on this Schedule 13D. Crossover Fund III and Ventures IV are filing this Schedule 13D jointly with the other Filers, but not as members of a group, and they expressly disclaim membership in a group, within the meaning of Rule 13d-5(b), with any other person.

These securities are held directly by investment funds to which Crosslink or Crossover III Management is investment adviser, including Crossover Fund III and Ventures IV, for the benefit of the investors in those funds. The Filers, except for Crossover Fund III and Ventures IV, disclaim beneficial ownership of such securities except to the extent of their respective pecuniary interest therein. In addition, the filing of this Schedule 13D on behalf of Crossover Fund III and Ventures IV should not be construed as an admission that either of them is, and each disclaims that it is, the beneficial owner as defined in Rule 13d-3 under the Exchange Act, of any of the securities covered by this Schedule 13D.

The Filers effected the following transactions in the Stock pursuant to the Private Placement and the exercise of the Warrants on the dates indicated, and such transactions are the only transactions in the Stock by the Filers since sixty days before the date on the cover page.

Note: These securities were distributed to the investors in Ventures IV and other investment funds of which Crosslink is the investment adviser and of which Ventures IV Holdings or Verwaltungs is the general partner, manager or holder of Class B Units.

The Funds purchased the Securities under that certain Securities Purchase and Admission Agreement (the "SPAA"), which amended, and pursuant to which the Funds joined and became parties to, that certain Securities Purchase Agreement dated October 2, 2002 (the "SPA"), among the Issuer and the purchasers (the "A-1 Purchasers") of the Issuer's Series A-1 Notes Due 2007 issued on December 31, 2002 (the "A-1 Notes"), and other parties. The Funds also joined and became parties to that certain Master Pledge and Security Agreement dated December 31, 2002, pursuant to which the A-1 and A-2 Notes are secured by a security interest in all of the assets of the Issuer and certain of its subsidiaries that is second in priority to the security interest in such assets in favor of the Lenders as defined in that certain Second Amended and Restated Credit and Guaranty Agreement, dated as of December 31, 2002, by and among the Issuer, certain of its affiliates and the Lenders (the "Credit Agreement"). The Funds also became a party to an intercreditor agreement with the A-1 Purchasers and the Administrative and Collateral Agents under and as defined in the Credit Agreement, and a registration rights agreement granting the Funds the right to cause the Issuer to register under the Securities Act of 1933, as amended, the Stock underlying the A-2 Notes and the Warrants.

Interest on the A-2 Notes is payable in the form of notes identical in terms to the A-2 Notes (the "PIK Notes"), beginning on June 5, 2005, except that the conversion price of the PIK Notes is $4.84 per share of the Stock issuable on their conversion, subject to adjustment upon the occurrence of certain events.

In connection with the Private Placement, the Filers also received Series A Cash Trigger Warrants to purchase shares of the Stock with an aggregate price of $2,500,000, Series B Cash Trigger Warrants to purchase shares of the Stock with an aggregate price of $5,000,000, and Change in Control Warrants to purchase shares of the Stock with an aggregate price of $10,000,000. The exercise price of the Series A Cash Trigger Warrants is the lesser of $9.792 or 90% of the current market value of the Stock at the time of exercise, subject to adjustment on the occurrence of certain events. The exercise price of the Series B Cash Trigger warrants is 90% of the current market value of the Stock at the time of exercise. The Series A and Series B Cash Trigger Warrants become exercisable on the date on which the Issuer fails to pay when due any installment of principal of any Loan as defined in the Credit Agreement, or defaults in its performance under certain covenants of the Credit Agreement.

The Change in Control Warrants become exercisable if there is a Change in Control of the Issuer, as defined in the SPA. The exercise price of the Change in Control Warrants is $0.01 per share of the Stock issued on exercise, subject to adjustment on the occurrence of certain events. The number of shares of the Stock issuable on exercise of the Change in Control Warrants is determined by a formula that depends on the date of a Change in Control and the current market value of the Stock at that time.

The Filers do not yet beneficially own the Stock that may be issued with respect to the PIK Notes, the Cash Trigger Warrants and the Change in Control Warrants within the meaning of Section 13(d) of the Exchange Act, and accordingly, no shares of that Stock are reported on this Schedule 13D.

Each of Crosslink and Crossover III Management is the investment adviser to investment funds pursuant to an investment management agreement for each fund that provides to Crosslink or Crossover III Management the authority, among other things, to invest the funds of such investment funds in the Stock, to vote and dispose of the Stock and to file this statement on behalf of such investment funds. Pursuant to an Agreement of Limited Partnership, Crossover III Management is entitled to allocations based on realized and unrealized gains of Crossover III, and Ventures IV Holdings is entitled to allocations based on realized and unrealized gains of Ventures IV. Crossover III Management, Ventures IV Holdings and Verwaltungs are entitled to allocations based on realized and unrealized gains of investment funds of which they are the general partner, manager or holder of Class B Units.

*Exhibit A Agreement Regarding Joint Filing of Statement on Schedule 13D or 13G

***Exhibit C Form of Securities Purchase and Admission Agreement

***Exhibit D Form of Series A-2 Convertible Secured Note Due 2007

***Exhibit E Form of Common Stock Warrant

***Exhibit F Form of Series A Cash Trigger Warrant

***Exhibit G Form of Series B Cash Trigger Warrant

***Exhibit H Form of Change in Control Warrant

*Exhibit I Form of Master Pledge and Security Agreement

*Exhibit J Form of Intercreditor Agreement

*Incorporated by reference to Exhibit 2.1 to the Current Report on Form 8-K filed by the Issuer with the Securities and Exchange Commission on October 9, 2002.

**Incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K filed by the Issuer with the Securities and Exchange Commission on May 1, 2003.

***Incorporated by reference to Exhibit A, I and J, respectively, to the Schedule 13D filed by the Filers on June 16, 2003.

SIGNATURES

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

Dated: March 1, 2004