OTTER TAIL CORP

Ticker: OTTR CUSIP: 689648103 Class: Common Stock

Empirical Financial Services, LLC d.b.a. Empirical Wealth Management's Holding History (CIK: 0001510434)

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

Q4 2025

Shares 4,055 Value ($000) $328 Avg Close $80.23 Range $73.20 - $85.91

Q4 2024

Shares 8,178 Value ($000) $604 Avg Close $75.57 Range $70.66 - $85.02

Q3 2024

Shares 7,372 Value ($000) $576 Avg Close $83.04 Range $72.06 - $96.51

Q2 2024

Shares 3,199 Value ($000) $280 Avg Close $83.59 Range $77.75 - $92.55

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	4,055	$328	$80.23	$73.20 - $85.91
Q4 2024	8,178	$604	$75.57	$70.66 - $85.02
Q3 2024	7,372	$576	$83.04	$72.06 - $96.51
Q2 2024	3,199	$280	$83.59	$77.75 - $92.55