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Amphastar Pharmaceuticals, Inc. Director's Dealing 2015

May 23, 2015

10216_dirs_2015-05-22_e0f3a40d-8c76-426d-9bd0-706dfe429295.zip

Director's Dealing

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SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Amphastar Pharmaceuticals, Inc. (AMPH)
CIK: 0001297184
Period of Report: 2015-05-20

Reporting Person: PRINS RICHARD K (Director)

Non-Derivative Transactions

Date Security Code Shares Price A/D Holdings After Ownership
2015-05-20 Common Stock M 13945 $11.68 Acquired 49996 Direct
2015-05-20 Common Stock S 13945 $14.7904 Disposed 36051 Direct
2015-05-21 Common Stock M 11901 $11.68 Acquired 47952 Direct
2015-05-21 Common Stock M 1664 $10.77 Disposed 49616 Direct
2015-05-21 Common Stock S 13565 $14.757 Disposed 36051 Direct
2015-05-22 Common Stock M 1942 $10.77 Acquired 37993 Direct
2015-05-22 Common Stock S 1942 $14.755 Disposed 36051 Direct

Derivative Transactions

Date Security Exercise Price Code Shares A/D Expiration Underlying Ownership
2015-05-20 Stock Option (right to buy) $11.68 M 13945 Disposed 2015-12-18 Common Stock (13945) Direct
2015-05-21 Stock Option (right to buy) $11.68 M 11901 Disposed 2015-12-18 Common Stock (11901) Direct
2015-05-21 Stock Option (right to buy) $10.77 M 1664 Disposed 2017-12-15 Common Stock (1664) Direct
2015-05-22 Stock Option (right to buy) $10.77 M 1942 Disposed 2017-12-15 Common Stock (1942) Direct

Footnotes

F1: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $14.76 to $14.91, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (1), (2) and (3) to this Form 4.

F2: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $14.70 to $15.00, inclusive.

F3: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $14.70 to $14.80, inclusive.

F4: Shares subject to the option are fully vested and immediately exercisable.