HOUGHTON MIFFLIN HARCOURT CO

CUSIP: 44157R109 Class: COM

OBERWEIS ASSET MANAGEMENT INC/'s Holding History (CIK: 0000937886)

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

Q4 2021
Shares 124,700 Value ($000) $2,008 Avg Close — Range —
Q3 2021
Shares 76,000 Value ($000) $1,021 Avg Close — Range —