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ARROWSTREET CAPITAL, LIMITED PARTNERSHIP

Position in AMPH — Amphastar Pharmaceuticals, Inc.

CIK 1164508 BOSTON, MA

Position in AMPH

as of Jun 30, 2026 · filed Aug 13, 2026
Position Value
$2,354,057
-$4,018,393 QoQ
Shares Held
116,653
-64.1% QoQ
Ownership
0.274%
of shares outstanding
% of Portfolio
0.00%
of 13F equity value
Holder Rank
#43
of 209 holders
Holding Since
Mar 2021
17 quarters on record
Voting authority Sole 100% Shared 0% None 0%

Common Shares in AMPH Over Time

Shares Held

Position Value (USD)

Position in Drug Manufacturers - Specialty & Generic

Healthcare · as of Jun 30, 2026

ARROWSTREET CAPITAL, LIMITED PARTNERSHIP holds $921,160,135 across 28 Drug Manufacturers - Specialty & Generic names. AMPH ranks #21 (0.3% of the industry book) .

# Ticker Company Shares Value (USD) Open

All Filings in AMPH

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17 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $2,354,057 116,653
2026-03-31 $6,372,450 325,291
2025-12-31 $14,981,428 559,426
2025-09-30 $10,455,061 392,310
2025-06-30 $1,865,247 81,239
2024-03-31 $989,687 22,539
2023-09-30 $1,298,297 28,230
2023-06-30 $1,672,319 29,099
2023-03-31 $2,785,275 74,274
2022-12-31 $4,652,440 166,040
2022-09-30 $5,649,926 201,065
2022-06-30 $10,599,538 304,672
2022-03-31 $14,057,901 391,585
2021-12-31 $9,689,781 416,049
2021-09-30 $3,772,952 198,472
2021-06-30 $2,941,706 145,918
2021-03-31 $1,023,520 55,869