Harbor Advisors’s NB Bancorp NBBK Stock Holding History

Harbor Advisors’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	$211K	Hold	10,000	–	–	0.03%	182
2025 Q4	$198K	Hold	10,000	–	–	0.03%	181
2025 Q3	$177K	Buy	+10,000	New	+$183K	0.03%	180

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

Harbor Advisors's NBBK Position: Q1 2026 in Review

Harbor Advisors held its NB Bancorp (NBBK) position steady in Q1 2026 at 10,000 shares worth $211K. The position accounts for 0.03% of the portfolio, ranked #182.

Harbor Advisors 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.

Harbor Advisors held 10,000 shares of NB Bancorp worth $211K as of Q1 2026.
Harbor Advisors left its NB Bancorp share count unchanged in Q1 2026.
NB Bancorp made up 0.03% of Harbor Advisors's portfolio in Q1 2026, its #182 holding.
Harbor Advisors 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 Harbor Advisors's 13F filing for Q1 2026, filed 7 May 2026.