Mariner’s NB Bancorp NBBK Stock Holding History

Mariner’s Portfolio NBBK Stock Details NBBK Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q1	$1.04M	Buy	49,495 +13,129	+36%	+$276K	﹤0.01%	1936
2025 Q4	$721K	Buy	36,366 +24,003	+194%	+$457K	﹤0.01%	2190
2025 Q3	$218K	Buy	+12,363	New	+$227K	﹤0.01%	3099

Other funds holding NBBK

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

Pertento Partners London, United Kingdom $1.37B AUM 36.36% 1-Year Est. Return

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

AltraVue Capital Bellevue, Washington $1.16B AUM 46.45% 1-Year Est. Return

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return

Goldman Sachs New York $871B AUM 31.28% 1-Year Est. Return

TCM

Tieton Capital Management Yakima, Washington $299M AUM 54.55% 1-Year Est. Return

Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return

Mariner's NBBK Position: Q1 2026 in Review

Mariner increased its NB Bancorp (NBBK) stake by 36% in Q1 2026, buying an estimated $276K and bringing the position to 49,495 shares worth $1.04M. The position accounts for ﹤0.01% of the portfolio, ranked #1936.

Mariner first reported a position in NBBK in Q3 2025 and has held it in 3 quarters since. 176 funds tracked by Wall St. Rank hold NBBK as of Q1 2026.

Mariner held 49,495 shares of NB Bancorp worth $1.04M as of Q1 2026.
Mariner bought 13,129 NB Bancorp shares in Q1 2026, an estimated $276K.
NB Bancorp made up ﹤0.01% of Mariner's portfolio in Q1 2026, its #1936 holding.
Mariner first reported a position in NB Bancorp in Q3 2025 and has held it in 3 quarters since.
176 funds tracked by Wall St. Rank held NB Bancorp as of Q1 2026.

Based on Mariner's 13F filing for Q1 2026, filed 13 May 2026.