Dimensional Fund Advisors Lp

13F Holdings History for OCTAVE SPECIALTY GROUP INC - Common Stock, $0.01 par value per share (AMBC)

Symbol: AMBC on NYSE
Investment type: Equity / Common Stock, $0.01 par value per share
Latest Disclosed Ownership: 2.14M shares
Security Ownership: 4.6%

Shares, Excluding Options vs Price

Value, Excluding Options

Dimensional Fund Advisors LP ownership in OCTAVE SPECIALTY GROUP INC Common Stock, $0.01 par value per share (AMBC)

2025-10-09 - Dimensional Fund Advisors LP has filed an SCHEDULE 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 2.14M shares of OCTAVE SPECIALTY GROUP INC Common Stock, $0.01 par value per share (AMBC). This represents 4.6% percent ownership of the company.

Reporting Name	Ownership %	Change	Value $	Shares owned	Change	Activity %	Price	Form	Report date	Filed at
Dimensional Fund Advisors LP	4.6%		$17.9M	2.14M			$8.34	13G/A	9/30/2025	9 Oct 2025 13:48:12

Holdings date	Weight	Change	Value $	Shares	Change	Activity %	Price	All Holders
9/30/2025	0%	0%	$17.9M	2.14M	-254,690	-10.6%	$8.34	Q3 2025
6/30/2025	0%	0%	$17M	2.4M	-161,143	-6.3%	$7.10	Q2 2025
3/31/2025	0.01%	0%	$22.4M	2.56M	-149,271		$8.75	Q1 2025
12/31/2024	0.01%	0%	$34.2M	2.71M	-98,249	-3.5%	$12.65	Q4 2024
9/30/2024	0.01%	0%	$31.4M	2.8M	-148,561	-5.03%	$11.21	Q3 2024
6/30/2024	0.01%	+0%	$37.9M	2.95M	+87,077	+3.04%	$12.82	Q2 2024
3/31/2024	0.01%	+0%	$44.8M	2.87M	+262,205	+10.1%	$15.63	Q1 2024
12/31/2023	0.01%	+0%	$42.9M	2.6M	+65,733	+2.59%	$16.48	Q4 2023
9/30/2023	0.01%	+0%	$30.6M	2.54M	+366,605	+16.9%	$12.06	Q3 2023
6/30/2023	0.01%	+0%	$30.9M	2.17M	+480,450	+28.4%	$14.24	Q2 2023
3/31/2023	0.01%	+0%	$26.2M	1.69M	+168,422	+11.1%	$15.48	Q1 2023
12/31/2022	0.01%	+0%	$26.6M	1.52M	+41,660	+2.81%	$17.44	Q4 2022
9/30/2022	0.01%	0%	$18.9M	1.48M	-81,148	-5.2%	$12.75	Q3 2022
6/30/2022	0.01%	0%	$17.7M	1.56M	-4,302	-0.27%	$11.35	Q2 2022
3/31/2022	0.01%	+0%	$16.3M	1.57M	+91,106	+6.18%	$10.40	Q1 2022
12/31/2021	0.01%	+0%	$23.7M	1.48M	+113,493	+8.33%	$16.05	Q4 2021
9/30/2021	0.01%	0%	$19.5M	1.36M	-314,925	-18.8%	$14.32	Q3 2021
6/30/2021	0.01%	0%	$26.3M	1.68M	-85,549	-4.85%	$15.66	Q2 2021
3/31/2021	0.01%	0%	$29.5M	1.76M	-86,305	-4.67%	$16.74	Q1 2021
12/31/2020	0.01%	0%	$28.4M	1.85M	-158,410	-7.89%	$15.38	Q4 2020
9/30/2020	0.01%	0%	$25.6M	2.01M	-54,682	-2.65%	$12.77	Q3 2020
6/30/2020	0.01%	0%	$29.5M	2.06M	-41,787	-1.99%	$14.32	Q2 2020
3/31/2020	0.01%	0%	$26M	2.1M	-4,825	-0.23%	$12.34	Q1 2020
12/31/2019	0.02%	0%	$45.5M	2.11M	-12,538	-0.59%	$21.57	Q4 2019
9/30/2019	0.02%	0%	$41.5M	2.12M	-17,510	-0.82%	$19.55	Q3 2019
6/30/2019	0.01%	0%	$36M	2.14M	-6,221	-0.29%	$16.85	Q2 2019
3/31/2019	0.02%	0%	$38.9M	2.14M	-75,377	-3.4%	$18.12	Q1 2019
12/31/2018	0.02%	0%	$38.3M	2.22M	-288,416	-11.5%	$17.24	Q4 2018
9/30/2018	0.02%	0%	$51.2M	2.51M	-32,999	-1.3%	$20.42	Q3 2018
6/30/2018	0.02%	0%	$50.4M	2.54M	-25,842	-1.01%	$19.85	Q2 2018
3/31/2018	0.02%		$40.3M	2.57M			$15.68	Q1 2018
12/31/2017	0.02%		$41M	2.57M			$15.98	Q4 2017
9/30/2017	0.02%	0%	$44.3M	2.57M	-4,042	-0.16%	$17.26	Q3 2017
6/30/2017	0.02%		$44.6M	2.57M			$17.35	Q2 2017
3/31/2017	0.02%		$48.5M	2.57M			$18.86	Q1 2017
12/31/2016	0.03%	+0%	$57.9M	2.57M	+146,075	+6.02%	$22.50	Q4 2016
9/30/2016	0.02%	+0%	$44.6M	2.43M	+225,815	+10.3%	$18.39	Q3 2016
6/30/2016	0.02%	+0%	$36.2M	2.2M	+396,486	+22%	$16.46	Q2 2016
3/31/2016	0.02%	+0%	$28.5M	1.8M	+208,770	+13.1%	$15.80	Q1 2016
12/31/2015	0.01%	+0%	$22.5M	1.59M	+14,163	+0.9%	$14.09	Q4 2015
9/30/2015	0.02%	+0%	$22.9M	1.58M	+19,788	+1.27%	$14.47	Q3 2015
6/30/2015	0.02%	+0%	$26M	1.56M	+203,678	+15%	$16.64	Q2 2015
3/31/2015	0.02%	+0%	$32.8M	1.36M	+243,812	+21.9%	$24.20	Q1 2015
12/31/2014	0.02%	+0%	$27.3M	1.11M	+94,383	+9.27%	$24.50	Q4 2014
9/30/2014	0.02%	+0%	$22.5M	1.02M	+204,744	+25.2%	$22.10	Q3 2014
6/30/2014	0.02%	+0.01%	$22.2M	813K	+444,363	+120%	$27.31	Q2 2014
3/31/2014	0.01%	+0.01%	$11.5M	369K	+334,757	+977%	$31.03	Q1 2014
12/31/2013	0%		$841K	34.3K			$24.55	Q4 2013

* Reported Price is the price of the security as of the portfolio date. This value is significant in that it is the last known price at which the security was still held.
An asterisk sign (*) next to the price indicates that the price is likely invalid.