MassMutual Private Wealth & Trust’s Merrimack Pharmaceuticals, Inc. MACK Stock Holding History

MassMutual Private Wealth & Trust’s Portfolio MACK Stock Details MACK Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q2	$0	Hold	24,500	–	–	﹤0.01%	2521
2026 Q1	$0	Hold	24,500	–	–	﹤0.01%	2525
2025 Q4	$0	Hold	24,500	–	–	﹤0.01%	2484
2025 Q3	$0	Hold	24,500	–	–	﹤0.01%	2473
2025 Q2	$0	Hold	24,500	–	–	﹤0.01%	2527
2025 Q1	$0	Hold	24,500	–	–	﹤0.01%	2536
2024 Q4	$371K	Buy	+24,500	New	+$371K	0.01%	359

MassMutual Private Wealth & Trust's MACK Position: Q2 2026 in Review

MassMutual Private Wealth & Trust held its Merrimack Pharmaceuticals, Inc. (MACK) position steady in Q2 2026 at 24,500 shares worth $0. The position accounts for ﹤0.01% of the portfolio, ranked #2521.

MassMutual Private Wealth & Trust first reported a position in MACK in Q4 2024 and has held it in 7 quarters since. The position peaked at $371K in Q4 2024. 1 fund tracked by Wall St. Rank holds MACK as of Q2 2026.

MassMutual Private Wealth & Trust held 24,500 shares of Merrimack Pharmaceuticals, Inc. worth $0 as of Q2 2026.
MassMutual Private Wealth & Trust left its Merrimack Pharmaceuticals, Inc. share count unchanged in Q2 2026.
Merrimack Pharmaceuticals, Inc. made up ﹤0.01% of MassMutual Private Wealth & Trust's portfolio in Q2 2026, its #2521 holding.
MassMutual Private Wealth & Trust first reported a position in Merrimack Pharmaceuticals, Inc. in Q4 2024 and has held it in 7 quarters since.
MassMutual Private Wealth & Trust's Merrimack Pharmaceuticals, Inc. position peaked at $371K in Q4 2024.
1 fund tracked by Wall St. Rank held Merrimack Pharmaceuticals, Inc. as of Q2 2026.

Based on MassMutual Private Wealth & Trust's 13F filing for Q2 2026, filed 2 Jul 2026.