SEC ownership of NBT BANCORP INC

Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0000790359.

Comparable stake leader

STATE STREET CORP

Disclosed value leader

BlackRock, Inc.

Comparable rows

50/50

Latest evidence

30 Jun 2026

Top shareholders Insider holders Latest transactions

Public ticker: NBTB on Nasdaq
Parsed ownership sources: 13D/G, 13F, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
Largest SEC-reported holder: STATE STREET CORP
Ranking: Comparable ownership first, then disclosed value
Comparable ownership rows: 50 of 50
Meaning: Rows with safely comparable ownership %
Latest 13D/G holder: STATE STREET CORP
Source: Latest parsed Schedule 13D/G stake
Latest parsed ownership date: 30 Jun 2026
Freshness: Most recent filing date in this holder set
Issuer CIK: 0000790359
Issuer location: Norwich, NY

Ownership snapshot

Top shareholders of NBT BANCORP INC (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.

Comparable stake leader

STATE STREET CORP

Disclosed value leader

BlackRock, Inc.

Comparable rows

50/50

Latest evidence

30 Jun 2026

13D/G 13F 3/4/5 Lead comparable stake: 5.3% 13D/G row: STATE STREET CORP Showing 1-8 of 50 holder rows.

Quick read

STATE STREET CORP leads the comparable SEC ownership view at 5.3%.

50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.

Open SEC evidence Opens STATE STREET CORP's linked filing trail.

Comparable ownership Top 5

STATE STREET CORP 5.3%

VANGUARD CAPITAL MANAGEMENT LLC 5.1%

Daniel Robinson II V 0.79%

Martin A. Dietrich 0.22%

Timothy E. Delaney 0.15%

Ownership % is shown only when SEC disclosures are safely comparable across share classes.

Detailed SEC evidence table Showing 1-8 of 50 holder rows

Holder	Evidence	Ownership %	Position	12M Net Δ	As of
STATE STREET CORP	13D/G 13F STATE STREET CORPORATION · Company 13D/G 13F	5.3%	$138,240,760 2,731,491 shares	$0	30 Jun 2026
VANGUARD CAPITAL MANAGEMENT LLC	13D/G 13F Vanguard Capital Management · Company 13D/G 13F	5.1%	$119,966,140 2,642,426 shares	$0	31 Mar 2026
Daniel Robinson II V	3/4/5 Director 3/4/5	0.79%	$17,428,540 409,313 shares	—	19 May 2026
Martin A. Dietrich	3/4/5 Director 3/4/5	0.22%	$4,781,478 112,294 shares	—	19 May 2026
Timothy E. Delaney	3/4/5 Director 3/4/5	0.15%	$3,222,210 75,674 shares	+$1,467,458	19 May 2026
David J. Nasca	3/4/5 Director 3/4/5	0.14%	$3,144,021 73,838 shares	-$851,103	19 May 2026
Richard J. Cantele Jr.	3/4/5 Director 3/4/5	0.12%	$2,611,020 61,320 shares	—	19 May 2026
Scott A. Kingsley	3/4/5 President & CEO NBT Bancorp 3/4/5	0.11%	$2,405,502 57,936 shares	—	23 Mar 2026

How to read this table

Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

Forms 3/4/5 flow

Insider trading overview

Net insider flow leans to selling over the last 12 months. Net value: -$1,803,563.

Buys

$1,467,458

Insiders: 1

Sells

$3,271,021

Insiders: 7

Net

-$1,803,563

Shares: -34,508

Window

Last 12 months

4 rolling buckets

Buy value Sell value

Shares: 34,730 Shares: 69,238

Window (months)	Buy shares	Sell shares	Buy value	Sell value	Net value
0-3	0	42,800	$0	$2,118,026	-$2,118,026
3-6	0	6,835	$0	$301,892	-$301,892
6-9	22,730	0	$976,708	$0	+$976,708
9-12	12,000	19,603	$490,750	$851,103	-$360,353

Reporting owners

Insider holders from Forms 3/4/5

Showing 1-20 of 32 reporting-owner rows connected to NBT BANCORP INC. Open a relationship link for the CIK-to-CIK filing trail.

Rows

Largest Forms 3/4/5 holder

Daniel Robinson II V

Net 12M change

-$1,803,563

Latest report

29 Jul 2026

Name	Relationship	Holdings Value	Past Year Net Change	Change %	Valuation	Report Date
Daniel Robinson II V	Director	$17,428,540			Mixed	19 May 2026
Johanna R. Ames	Director	$16,983,937			Mixed	19 May 2026
Joseph R. Stagliano	SEVP & President of NBT Bank	$5,029,626			Mixed	23 Mar 2026
Martin A. Dietrich	Director	$4,781,478			Mixed	19 May 2026
Jack H. Webb	Director	$4,362,693			Mixed	22 Nov 2024
Joseph A. Santangelo	Director	$4,284,806			Mixed	31 Dec 2022
Timothy E. Delaney	Director	$3,222,210	+$1,467,458	+84%	Mixed	19 May 2026
David J. Nasca	Director	$3,144,021	-$851,103	-21%	Mixed	19 May 2026
Richard J. Cantele Jr.	Director	$2,611,020			Mixed	19 May 2026
Timothy L. Brenner	EVP & President Wealth Mgmt	$2,580,567			Mixed	15 May 2021
John H. Watt Jr.	Director	$2,560,975	-$995,751	-28%	Filing P/S	09 Jun 2026
Catherine M. Scarlett	EVP, Chief HR & Ethics Officer	$2,466,275			Mixed	15 Dec 2021
Scott A. Kingsley	President & CEO NBT Bancorp	$2,405,502			Mixed	23 Mar 2026
Matthew J. Salanger	Director	$2,186,211			Mixed	19 May 2026
Lowell A. Seifter	Director	$1,781,183			Mixed	21 May 2024
Sarah A. Halliday	EVP/Chief Comm Innovation Off	$1,634,010	-$486,401	-23%	Mixed	29 Jul 2026
John C. Mitchell	Director	$1,455,875			Mixed	25 May 2021
Ruth H. Mahoney	EVP/President of Wealth Mgmt	$1,386,727	-$477,350	-26%	Mixed	29 Jul 2026
Shaunastar M. Hyle	EVP, Retail Community Banking	$1,362,615			Mixed	23 Mar 2026
Patricia T. Civil	Director	$1,223,501			Mixed	31 Dec 2021

Recent insider transactions for NBT BANCORP INC

Showing up to 300 recent insider transactions from the last 12 months.

Insider	Symbol	Class	Transaction	%	SEC-reported value	SEC-reported price	Shares	Shares owned	Date	Ownership
Ruth H. Mahoney	NBTB	NBT Bancorp Inc. Common Stock	Sale	-27.4%	$244,350	$54.30	-4,500	11,928	29 Jul 2026	Direct
Sarah A. Halliday	NBTB	NBT Bancorp Inc. Common Stock	Sale	-29%	$486,401	$54.04	-9,000	22,054	29 Jul 2026	Direct
Martin Randolph Sparks	NBTB	NBT Bancorp Inc. Common Stock	Sale	-7.66%	$57,650	$48.04	-1,200	14,463	12 Jun 2026	Direct
Heidi M. Hoeller	NBTB	NBT Bancorp Inc. Common Stock	Sale	-15.4%	$100,874	$48.04	-2,100	11,560	12 Jun 2026	Direct
John H. Watt Jr.	NBTB	NBT Bancorp Inc. Common Stock	Sale	-28%	$995,751	$47.42	-21,000	54,010	09 Jun 2026	Direct
Ruth H. Mahoney	NBTB	NBT Bancorp Inc. Common Stock	Sale	-23.3%	$233,000	$46.60	-5,000	16,428	05 Jun 2026	Direct
Andrew S. Kowalczyk III	NBTB	Phantom Stock	Award	17.1%			1,128	7,727	21 May 2026	Direct
John H. Watt Jr.	NBTB	NBT Bancorp Inc. Common Stock	Award	1.42%			1,050	75,010	19 May 2026	Direct
Andrew S. Kowalczyk III	NBTB	NBT Bancorp Inc. Common Stock	Award	8.34%			1,050	13,642	19 May 2026	Direct
Johanna R. Ames	NBTB	NBT Bancorp Inc. Common Stock	Award	16%			1,050	7,593	19 May 2026	Direct
Timothy E. Delaney	NBTB	NBT Bancorp Inc. Common Stock	Award	2.02%			1,050	52,935	19 May 2026	Direct
Richard J. Cantele Jr.	NBTB	NBT Bancorp Inc. Common Stock	Award	1.84%			1,050	58,106	19 May 2026	Direct
Matthew J. Salanger	NBTB	NBT Bancorp Inc. Common Stock	Award	3.88%			1,050	28,116	19 May 2026	Direct
Martin A. Dietrich	NBTB	NBT Bancorp Inc. Common Stock	Award	0.94%			1,050	112,294	19 May 2026	Direct
Jason David Brown	NBTB	NBT Bancorp Inc. Common Stock	Award	14.3%			1,050	8,414	19 May 2026	Direct
Heidi M. Hoeller	NBTB	NBT Bancorp Inc. Common Stock	Award	8.33%			1,050	13,660	19 May 2026	Direct
Daniel Robinson II V	NBTB	NBT Bancorp Inc. Common Stock	Award	5.07%			1,050	21,755	19 May 2026	Direct
David J. Nasca	NBTB	NBT Bancorp Inc. Common Stock	Award	1.49%			1,050	71,705	19 May 2026	Direct
Martin Randolph Sparks	NBTB	NBT Bancorp Inc. Common Stock	Tax liability	-2.25%			-361	15,663	15 May 2026	Direct
Cynthia A. Smaniotto	NBTB	NBT Bancorp Inc. Common Stock	Tax liability	-1.58%			-285	17,747	15 May 2026	Direct
Amy Wiles	NBTB	NBT Bancorp Inc. Common Stock	Tax liability	-8.28%			-2,453	27,161	15 May 2026	Direct
Sarah A. Halliday	NBTB	NBT Bancorp Inc. Common Stock	Discretionary transaction in accordance with Rule 16b-3(f) resulting in acquisition or disposition of issuer securities	-52.5%			-4,016	3,637	11 May 2026	401k
Sarah A. Halliday	NBTB	NBT Bancorp Inc. Common Stock	Tax liability	-3.15%			-927	28,485	23 Mar 2026	Direct
Sarah A. Halliday	NBTB	NBT Bancorp Inc. Common Stock	Award	20.8%			5,346	31,054	23 Mar 2026	Direct
Shaunastar M. Hyle	NBTB	NBT Bancorp Inc. Common Stock	Tax liability	-2.88%			-803	27,072	23 Mar 2026	Direct
Shaunastar M. Hyle	NBTB	NBT Bancorp Inc. Common Stock	Award	20.5%			4,977	29,298	23 Mar 2026	Direct
Scott A. Kingsley	NBTB	NBT Bancorp Inc. Common Stock	Tax liability	-0.23%			-125	54,410	23 Mar 2026	Direct
Scott A. Kingsley	NBTB	NBT Bancorp Inc. Common Stock	Award	27.9%			12,651	57,936	23 Mar 2026	Direct
Martin Randolph Sparks	NBTB	NBT Bancorp Inc. Common Stock	Tax liability	-6.95%			-991	13,278	23 Mar 2026	Direct
Martin Randolph Sparks	NBTB	NBT Bancorp Inc. Common Stock	Award	54.7%			5,665	16,024	23 Mar 2026	Direct
Amy Wiles	NBTB	NBT Bancorp Inc. Common Stock	Award	38.5%			8,228	29,614	23 Mar 2026	Direct
Amy Wiles	NBTB	NBT Bancorp Inc. Common Stock	Tax liability	-0.53%			-114	21,386	23 Mar 2026	Direct
Joseph R. Stagliano	NBTB	NBT Bancorp Inc. Common Stock	Tax liability	-1.23%			-1,035	83,365	23 Mar 2026	Direct
Joseph R. Stagliano	NBTB	NBT Bancorp Inc. Common Stock	Award	9.38%			7,398	86,235	23 Mar 2026	Direct
Ruth H. Mahoney	NBTB	NBT Bancorp Inc. Common Stock	Tax liability	-4.56%			-904	18,921	23 Mar 2026	Direct
Ruth H. Mahoney	NBTB	NBT Bancorp Inc. Common Stock	Award	34.3%			5,468	21,428	23 Mar 2026	Direct
Cynthia A. Smaniotto	NBTB	NBT Bancorp Inc. Common Stock	Tax liability	-0.35%			-62	17,820	23 Mar 2026	Direct
Cynthia A. Smaniotto	NBTB	NBT Bancorp Inc. Common Stock	Award	14.3%			2,254	18,032	23 Mar 2026	Direct
Annette L. Burns	NBTB	NBT Bancorp Inc. Common Stock	Tax liability	-0.36%			-86	24,079	23 Mar 2026	Direct
Annette L. Burns	NBTB	NBT Bancorp Inc. Common Stock	Award	16.9%			3,509	24,313	23 Mar 2026	Direct
Martin Randolph Sparks	NBTB	NBT Bancorp Inc. Common Stock	Sale	-17.4%	$99,120	$41.30	-2,400	11,350	13 Mar 2026	Direct
Joseph R. Stagliano	NBTB	Phantom Stock	Award	10.6%			2,642	27,602	06 Mar 2026	Direct
Amy Wiles	NBTB	NBT Bancorp Inc. Common Stock	Sale	-17.1%	$202,772	$45.72	-4,435	21,500	17 Feb 2026	Direct
Timothy E. Delaney	NBTB	NBT Bancorp Inc. Common Stock	Purchase		$976,708	$42.97	22,730	22,730	28 Jan 2026	by Corporation
Scott A. Kingsley	NBTB	NBT Bancorp Inc. Common Stock	Tax liability	-4.26%			-2,019	45,410	15 Jan 2026	Direct
Shaunastar M. Hyle	NBTB	NBT Bancorp Inc. Common Stock	Tax liability	-3.71%			-968	25,124	15 Jan 2026	Direct
Sarah A. Halliday	NBTB	NBT Bancorp Inc. Common Stock	Tax liability	-5.51%			-1,552	26,635	15 Jan 2026	Direct
Martin Randolph Sparks	NBTB	NBT Bancorp Inc. Common Stock	Tax liability	-6.86%			-1,001	13,589	15 Jan 2026	Direct
Ruth H. Mahoney	NBTB	NBT Bancorp Inc. Common Stock	Tax liability	-5.35%			-942	16,661	15 Jan 2026	Direct
Joseph R. Stagliano	NBTB	NBT Bancorp Inc. Common Stock	Tax liability	-1.78%			-1,427	78,963	15 Jan 2026	Direct

^* marks a reported price that did not pass the local price check.