ADTRAN INC

CUSIP: 00738A106 Class: COMMON STOCK

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC's Holding History (CIK: 0001644956)

Note: Option positions (PUT/CALL) are excluded.

Q4 2017
Shares 1,018,565 Value ($000) $19,709 Avg Close — Range —
Q3 2017
Shares 1,029,385 Value ($000) $24,705 Avg Close — Range —
Q2 2017
Shares 853,029 Value ($000) $17,615 Avg Close — Range —
Q1 2017
Shares 662,720 Value ($000) $13,751 Avg Close — Range —
Q4 2016
Shares 665,405 Value ($000) $14,872 Avg Close — Range —
Q3 2016
Shares 665,352 Value ($000) $12,735 Avg Close — Range —
Q2 2016
Shares 591,151 Value ($000) $11,025 Avg Close — Range —
Q1 2016
Shares 512,806 Value ($000) $10,369 Avg Close — Range —