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FORM 4
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                                 U.S. SECURITIES AND EXCHANGE COMMISSION
                                          Washington, DC 20549

                               STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP
[ ] Check box if no
    longer subject to         Filed pursuant to Section 16(a) of the Securities
    Section 16. Form 4            Exchange Act of 1934, Section 17(a) of the
    or Form 5 obligations         Public Utility Holding Company Act of 1935
    may continue. See              or Section 30(f) of the Investment Company
    Instruction 1(b).                           Act of 1940

                                                                                                       
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| 1. Name and Address of Reporting Person(1) | 2. Issuer Name and Ticker or Trading Symbol  |6. Relationship of Reporting Person to|
|    Vinroot      Richard             A.     | Martin Marietta Materials, Inc. (MLM)        |     Issuer (Check all applicable)    |
|--------------------------------------------|----------------------------------------------|                                      |
| (Last)          (First)          (Middle)  | 3. IRS Identification   | 4.  Statement For  |  [X] Director      [ ] 10% Owner     |
|                                            |    Number of Reporting  |     Month/Year     |  [ ] Officer (give [ ] Other (Specify|
| Robinson, Bradshaw & Hinson                |    Person, if an Entity |                    |              title           below)  |
| 1900 Independence Center                   |    (Voluntary)          |       4/2000       |              below)                  |
| 101 N. Tryon Street                        |                         |                    |                                      |
|--------------------------------------------|                         |--------------------|--------------------------------------|
|                (Street)                    |                         | 5. If Amendment,   |7. Individual or Joint/Group Filing   |
|                                            |                         |    Date of Original|   (Check applicable line)            |
|                                            |                         |    (Month/Year)    |   [X] Form Filed by One              |
| Charlotte          NC              28246   |                         |                    |       Reporting Person               |
|--------------------------------------------|----------------------------------------------|   [ ] Form Filed by More Than        |
| (City)           (State)           (Zip)   |                                              |       One Reporting Person           |
|                                            |                                              |                                      |
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|                        TABLE 1 -- NON-DERIVATIVE SECURITIES ACQUIRED, DISPOSED OF, OR BENEFICIALLY OWNED                         |
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|1. Title of Security |2. Transaction     |3. Transac-   |4. Securities Acquired (A) | 5. Amount of Se-   |6. Owner-    |7. Nature |
|   (Instr. 3)        |   Date            |   tion Code  |   or Disposed of (D)      |    curities Benefi-|   ship      |   of In- |
|                     |   (Month/Day/     |   (Instr. 8) |                           |    cially Owned at |   Form:     |   direct |
|                     |   Year)           |              |                           |    End of Month    |   Direct    |   Benefi-|
|                     |                   |              |   (Instr. 3, 4 and 5)     |    (Instr. 3 and 4)|   (D) or    |   cial   |
|                     |                   |--------------|---------------------------|                    |   Indirect  |   Owner- |
|                     |                   | Code  |  V   |    Amount  | (A) or| Price|                    |   (I)       |   ship   |
|                     |                   |       |      |            | (D)   |      |                    |   (Instr. 4)|   (Instr.|
|                     |                   |       |      |            |       |      |                    |             |   4)     |
|---------------------|-------------------|-------|------|------------|-------|------|--------------------|-------------|----------|
|                     |                   |       |      |            |       |      |                    |             |          |
|---------------------|-------------------|-------|------|------------|-------|------|--------------------|-------------|----------|
|                     |                   |       |      |            |       |      |                    |             |          |
|---------------------|-------------------|-------|------|------------|-------|------|--------------------|-------------|----------|
|                     |                   |       |      |            |       |      |                    |             |          |
|---------------------|-------------------|-------|------|------------|-------|------|--------------------|-------------|----------|
|                     |                   |       |      |            |       |      |                    |             |          |
|---------------------|-------------------|-------|------|------------|-------|------|--------------------|-------------|----------|
|                     |                   |       |      |            |       |      |                    |             |          |
|---------------------|-------------------|-------|------|------------|-------|------|--------------------|-------------|----------|
|                     |                   |       |      |            |       |      |                    |             |          |
|---------------------|-------------------|-------|------|------------|-------|------|--------------------|-------------|----------|
|                     |                   |       |      |            |       |      |                    |             |          |
|---------------------|-------------------|-------|------|------------|-------|------|--------------------|-------------|----------|
|                     |                   |       |      |            |       |      |                    |             |          |
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FORM 4 (CONTINUED) TABLE II -- DERIVATIVE SECURITIES ACQUIRED, DISPOSED OF, OR BENEFICIALLY OWNED (E.G., PUTS, CALLS, WARRANTS, OPTIONS, CONVERTIBLE SECURITIES) - ------------------------------------------------------------------------------------------------------------------------------------ |1. Title of Derivative | 2. Conver- |3. Trans- |4. Trans- |5. Number of | 6. Date Exer- |7. Title and Amount |8. Price | | Security | sion or | action | action | Derivative | cisable and | of Underlying | of | | (Instr. 3) | Exercise | Date | Code | Securities | Expiration | Securities | Deriv- | | | Price of | (Month/| (Instr.| Acquired (A) | Date | (Instr. 3 and 4) | ative | | | Deriv- | Day/ | 8) | or Disposed | (Month/Day/ | | Secur- | | | ative | Year) | | or (D) | Year) | | ity | | | Security | | | (Instr. 3, | | | (Instr. 5)| | | | | | 4, and 5) |-----------------|--------------------| | | | | | | | Date |Expira- | | Amount or| | | | | |----------|----------------| Exer- |tion | Title | Number of| | | | | | Code| V | (A) | (D) | cisable|Date | | Shares | | |-----------------------|--------------|----------|-----|----|-------|--------|--------|--------|--------|-----------|-------------| |Stock Units (1) | 1-for-1 |4/1/2000 | A | V | 54.00| | (1) | (1) |Common | 54.00 | 46.75 | | | | | | | | | | |Stock | | | |-----------------------|--------------|----------|-----|----|-------|--------|--------|--------|--------|-----------|-------------| | | | | | | | | | | | | | |-----------------------|--------------|----------|-----|----|-------|--------|--------|--------|--------|-----------|-------------| | | | | | | | | | | | | | |-----------------------|--------------|----------|-----|----|-------|--------|--------|--------|--------|-----------|-------------| | | | | | | | | | | | | | |-----------------------|--------------|----------|-----|----|-------|--------|--------|--------|--------|-----------|-------------| | | | | | | | | | | | | | |-----------------------|--------------|----------|-----|----|-------|--------|--------|--------|--------|-----------|-------------| | | | | | | | | | | | | | - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------ | 9. Number of | 10. Ownership | 11. Nature of | | Derivative | Form of | Indirect | | Securities | Derivative | Beneficial | | Beneficially | Security: | Ownership | | Owned at End | Direct (D) | (Instr. 4) | | of Month | or Indirect (I) | | | (Instr. 4) | (Instr. 4) | | | | | | |---------------------|-------------------------------|----------------------| | 2,689.82 | D | | |---------------------|-------------------------------|----------------------| | | | | |---------------------|-------------------------------|----------------------| | | | | |---------------------|-------------------------------|----------------------| | | | | |---------------------|-------------------------------|----------------------| | | | | |---------------------|-------------------------------|----------------------| | | | | - ------------------------------------------------------------------------------ Explanation of Responses: (1) The stock Units were accrued under the Martin Marietta Materials, Inc. Common Stock Purchase Plan for Directors (the "Plan") and are to be settled in cash and/or stock on (i) the date the reporting person ceases to be a Non-Employee Director or (ii) the date that is one month and one year following the date the reporting person ceases to be a Non-Employee Director, in accordance with the reporting person's election under the Plan. (*) Intentional misstatements or omissions of facts constitute Federal Criminal /s/ Richard A. Vinroot 5/9/00 Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a). -------------------------------- ---------- Signature of Reporting Person(*) Date Richard A. Vinroot Note. File three copies of this form, one of which must be manually signed. Page 2 If space provided is insufficient, see Instruction 6 for procedure. (Print or Type Responses)