MILESTONE SCIENTIFIC INC. — Director's Dealing 2015

May 20, 2015

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MILESTONE SCIENTIFIC INC. (MLSS.OB)
CIK: 0000855683
Period of Report: 2015-05-19

Reporting Person: OSSER LEONARD (Director, CEO, 10% Owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2015-05-19	Common Stock, $.001 par value	P	25000	$2.40	Acquired	2817090	Direct

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Options to purchase common stock	$1.49	2019-11-01	Common Stock (73333)	73333	Direct
Options to purchase common stock	$1.65	2018-12-31	Common Stock (248448)	248448	Direct
Options to purchase common stock	$0.75	2017-01-09	Common Stock (133334)	133334	Direct
Options to purchase common stock	$2.38	2019-11-20	Common Stock (185185)	185185	Direct

Footnotes

F1: Includes 706,717 shares of common stock issuable at the termination of employment.

F2: These options are exercisable as follows: (i) immediately for 137,972 and (ii) for an additional 55,238 on each of 12/31/15 and 12/31/16.

F3: Immediately exercisable.

F4: These options are exercisable as follows: (i) for 61,728 shares on the date of grant (11-20-14) and (ii) for an additional 1/3 of the 123,457 remaining shares on each of the 1st through 3rd anniversaries of the date of grant.