BlackRock
OSG

BlackRock’s Octave Specialty Group OSG Stock Holding History

BlackRock’s Portfolio OSG Stock Details OSG Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$28.5M Buy
4,572,516
+654,718
+17% +$3.41M ﹤0.01% 3033
2026
Q1 		$18.2M Sell
3,917,798
-570,670
-13% -$3.27M ﹤0.01% 3136
2025
Q4 		$34.9M Sell
4,488,468
-4,863
-0.1% -$41.6K ﹤0.01% 2749
2025
Q3 		$37.5M Sell
4,493,331
-94,723
-2% -$800K ﹤0.01% 2689
2025
Q2 		$32.6M Sell
4,588,054
-306,626
-6% -$2.28M ﹤0.01% 2731
2025
Q1 		$42.8M Sell
4,894,680
-3,065,833
-39% -$32.3M ﹤0.01% 2454
2024
Q4 		$101M Buy
7,960,513
+248,771
+3% +$3M ﹤0.01% 2081
2024
Q3 		$86.4M Buy
7,711,742
+247,958
+3% +$2.9M ﹤0.01% 2169
2024
Q2 		$95.7M Buy
7,463,784
+252,028
+3% +$3.84M ﹤0.01% 2053
2024
Q1 		$113M Sell
7,211,756
-73,648
-1% -$1.16M ﹤0.01% 1989
2023
Q4 		$120M Buy
7,285,404
+454,843
+7% +$6.32M ﹤0.01% 1973
2023
Q3 		$82.4M Sell
6,830,561
-3,789
-0.1% -$50.9K ﹤0.01% 2106
2023
Q2 		$97.3M Buy
6,834,350
+425
+0% +$6.22K ﹤0.01% 2066
2023
Q1 		$106M Buy
6,833,925
+170,380
+3% +$2.76M ﹤0.01% 1982
2022
Q4 		$116M Buy
6,663,545
+172,100
+3% +$2.56M ﹤0.01% 1896
2022
Q3 		$82.8M Sell
6,491,445
-188,588
-3% -$2.51M ﹤0.01% 2093
2022
Q2 		$75.8M Buy
6,680,033
+321,702
+5% +$3.05M ﹤0.01% 2208
2022
Q1 		$66.1M Sell
6,358,331
-95,253
-1% -$1.29M ﹤0.01% 2407
2021
Q4 		$104M Buy
6,453,584
+126,757
+2% +$1.99M ﹤0.01% 2196
2021
Q3 		$90.6M Sell
6,326,827
-199,042
-3% -$2.84M ﹤0.01% 2285
2021
Q2 		$102M Sell
6,525,869
-92,263
-1% -$1.48M ﹤0.01% 2232
2021
Q1 		$111M Buy
6,618,132
+311,893
+5% +$5.1M ﹤0.01% 2139
2020
Q4 		$97M Buy
6,306,239
+31,922
+0.5% +$470K ﹤0.01% 2105
2020
Q3 		$80.1M Sell
6,274,317
-108,113
-2% -$1.39M ﹤0.01% 2024
2020
Q2 		$91.4M Sell
6,382,430
-7,076
-0.1% -$103K ﹤0.01% 1893
2020
Q1 		$78.8M Sell
6,389,506
-42,479
-0.7% -$814K ﹤0.01% 1792
2019
Q4 		$139M Buy
6,431,985
+48,104
+0.8% +$986K 0.01% 1752
2019
Q3 		$125M Buy
6,383,881
+157,342
+3% +$2.89M 0.01% 1759
2019
Q2 		$105M Sell
6,226,539
-1,537
-0% -$26.2K ﹤0.01% 1880
2019
Q1 		$113M Buy
6,228,076
+37,500
+0.6% +$716K 0.01% 1794
2018
Q4 		$107M Buy
6,190,576
+4,020,294
+185% +$73.8M 0.01% 1753
2018
Q3 		$44.3M Buy
2,170,282
+55,967
+3% +$1.17M ﹤0.01% 2444
2018
Q2 		$42M Sell
2,114,315
-12,567
-0.6% -$232K ﹤0.01% 2462
2018
Q1 		$33.3M Sell
2,126,882
-27,093
-1% -$419K ﹤0.01% 2492
2017
Q4 		$34.4M Buy
2,153,975
+49,143
+2% +$756K ﹤0.01% 2487
2017
Q3 		$36.3M Sell
2,104,832
-5,918
-0.3% -$109K ﹤0.01% 2473
2017
Q2 		$36.6M Sell
2,110,750
-21,585
-1% -$384K ﹤0.01% 2444
2017
Q1 		$40.2M Buy
2,132,335
+2,121,776
+20,094% +$44.6M ﹤0.01% 2355
2016
Q4 		$237K Hold
10,559
– – ﹤0.01% 2035
2016
Q3 		$194K Sell
10,559
-424
-4% -$7.61K ﹤0.01% 2173
2016
Q2 		$180K Buy
10,983
+8,221
+298% +$132K ﹤0.01% 2162
2016
Q1 		$44K Sell
2,762
-561
-17% -$8.12K ﹤0.01% 2430
2015
Q4 		$47K Hold
3,323
– – ﹤0.01% 2091
2015
Q3 		$48K Buy
3,323
+2,371
+249% +$38.5K ﹤0.01% 1922
2015
Q2 		$16K Sell
952
-96
-9% -$2.27K ﹤0.01% 2497
2015
Q1 		$25K Hold
1,048
– – ﹤0.01% 2243
2014
Q4 		$26K Hold
1,048
– – ﹤0.01% 2233
2014
Q3 		$23K Hold
1,048
– – ﹤0.01% 2254
2014
Q2 		$29K Hold
1,048
– – ﹤0.01% 2187
2014
Q1 		$33K Sell
1,048
-113
-10% -$3.12K ﹤0.01% 2107
2013
Q4 		$29K Sell
1,161
-66
-5% -$1.38K ﹤0.01% 2175
2013
Q3 		$22K Buy
1,227
+96
+8% +$2.19K ﹤0.01% 2222
2013
Q2 		$27K Buy
+1,131
New +$27.4K ﹤0.01% 2132

Other funds holding OSG

WSL
Western Standard LLC Los Angeles, California $295M AUM 40.98% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
PGCM
Prescott Group Capital Management Tulsa, Oklahoma $1.16B AUM 53.61% 1-Year Est. Return
TAM
Third Avenue Management New York $625M AUM 48.93% 1-Year Est. Return
BCC
Bain Capital Credit Boston, Massachusetts $368M AUM 9.33% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return
Jacobs Levy Equity Management
Jacobs Levy Equity Management Florham Park, New Jersey $27.8B AUM 46.46% 1-Year Est. Return
Marshall Wace
Marshall Wace London, United Kingdom $127B AUM 46.06% 1-Year Est. Return

BlackRock's OSG Position: Q2 2026 in Review

BlackRock increased its Octave Specialty Group (OSG) stake by 17% in Q2 2026, buying an estimated $3.41M and bringing the position to 4,572,516 shares worth $28.5M. The position accounts for ﹤0.01% of the portfolio, ranked #3033.

BlackRock first reported a position in OSG in Q2 2013 and has held it in 53 quarters since. The position peaked at $139M in Q4 2019. 148 funds tracked by Wall St. Rank hold OSG as of Q2 2026.

  • BlackRock held 4,572,516 shares of Octave Specialty Group worth $28.5M as of Q2 2026.
  • BlackRock bought 654,718 Octave Specialty Group shares in Q2 2026, an estimated $3.41M.
  • Octave Specialty Group made up ﹤0.01% of BlackRock's portfolio in Q2 2026, its #3033 holding.
  • BlackRock first reported a position in Octave Specialty Group in Q2 2013 and has held it in 53 quarters since.
  • BlackRock's Octave Specialty Group position peaked at $139M in Q4 2019.
  • 148 funds tracked by Wall St. Rank held Octave Specialty Group as of Q2 2026.

Based on BlackRock's 13F filing for Q2 2026, filed 7 Aug 2026.