Jane Street’s iShares MBS ETF MBB Stock Holding History
Bought
Maintained
Sold
| Quarter | Market Value | Status | Shares |
Change in Stake | Trade Value | Portfolio Weight | Portfolio Position | |
|---|---|---|---|---|---|---|---|---|
|
2026
Q1 | $18.7M | Buy |
+196,999
| New | +$18.8M | ﹤0.01% | 1840 |
|
|
2025
Q2 | – | Sell |
-949,675
| Closed | -$89.1M | – | 10379 |
|
|
2025
Q1 | $89.1M | Buy |
949,675
+907,328
| +2,143% | +$83.9M | 0.02% | 425 |
|
|
2024
Q4 | $3.88M | Sell |
42,347
-604,203
| -93% | -$56.3M | ﹤0.01% | 3031 |
|
|
2024
Q3 | $61.9M | Buy |
646,550
+636,592
| +6,393% | +$60.2M | 0.01% | 585 |
|
|
2024
Q2 | $914K | Sell |
9,958
-8,419,126
| -100% | -$767M | ﹤0.01% | 5936 |
|
|
2024
Q1 | $779M | Buy |
8,429,084
+7,116,171
| +542% | +$658M | 0.16% | 64 |
|
|
2023
Q4 | $124M | Buy |
1,312,913
+1,139,583
| +657% | +$102M | 0.03% | 334 |
|
|
2023
Q3 | $15.4M | Sell |
173,330
-1,090,400
| -86% | -$99.7M | 0.01% | 1337 |
|
|
2023
Q2 | $118M | Buy |
1,263,730
+1,052,171
| +497% | +$99M | 0.04% | 285 |
|
|
2023
Q1 | $20M | Sell |
211,559
-247,375
| -54% | -$23.4M | 0.01% | 999 |
|
|
2022
Q4 | $42.6M | Sell |
458,934
-3,380,155
| -88% | -$312M | 0.02% | 604 |
|
|
2022
Q3 | $352M | Buy |
3,839,089
+1,576,534
| +70% | +$153M | 0.15% | 68 |
|
|
2022
Q2 | $221M | Buy |
+2,262,555
| New | +$222M | 0.09% | 135 |
|
|
2022
Q1 | – | Sell |
-3,207,216
| Closed | -$335M | – | 10724 |
|
|
2021
Q4 | $345M | Buy |
3,207,216
+3,203,991
| +99,349% | +$345M | 0.11% | 97 |
|
|
2021
Q3 | $349K | Sell |
3,225
-9,302,909
| -100% | -$1.01B | ﹤0.01% | 7897 |
|
|
2021
Q2 | $1.01B | Buy |
9,306,134
+5,804,627
| +166% | +$629M | 0.39% | 26 |
|
|
2021
Q1 | $380M | Buy |
3,501,507
+3,335,312
| +2,007% | +$365M | 0.19% | 67 |
|
|
2020
Q4 | $18.3M | Sell |
166,195
-2,097,397
| -93% | -$231M | 0.01% | 929 |
|
|
2020
Q3 | $250M | Buy |
2,263,592
+245,143
| +12% | +$27.1M | 0.15% | 87 |
|
|
2020
Q2 | $223M | Buy |
2,018,449
+474,145
| +31% | +$52.5M | 0.17% | 73 |
|
|
2020
Q1 | $171M | Buy |
+1,544,304
| New | +$168M | 0.17% | 82 |
|
|
2019
Q4 | – | Sell |
-1,611,788
| Closed | -$175M | – | 5475 |
|
|
2019
Q3 | $175M | Buy |
1,611,788
+1,443,135
| +856% | +$156M | 0.29% | 60 |
|
|
2019
Q2 | $18.1M | Sell |
168,653
-270,678
| -62% | -$28.8M | 0.03% | 400 |
|
|
2019
Q1 | $46.7M | Buy |
+439,331
| New | +$46.2M | 0.08% | 186 |
|
|
2018
Q4 | – | Sell |
-398,344
| Closed | -$41.2M | – | 5393 |
|
|
2018
Q3 | $41.2M | Buy |
+398,344
| New | +$41.3M | 0.08% | 165 |
|
|
2018
Q2 | – | Sell |
-1,299,616
| Closed | -$136M | – | 5351 |
|
|
2018
Q1 | $136M | Buy |
+1,299,616
| New | +$136M | 0.35% | 47 |
|
|
2017
Q3 | – | Sell |
-37,801
| Closed | -$4.04M | – | 4820 |
|
|
2017
Q2 | $4.04M | Buy |
37,801
+18,452
| +95% | +$1.97M | 0.01% | 908 |
|
|
2017
Q1 | $2.06M | Buy |
+19,349
| New | +$2.06M | 0.01% | 1352 |
|
|
2016
Q4 | – | Sell |
-58,547
| Closed | -$6.45M | – | 4374 |
|
|
2016
Q3 | $6.45M | Buy |
+58,547
| New | +$6.44M | 0.03% | 476 |
|
|
2016
Q2 | – | Sell |
-84,773
| Closed | -$9.28M | – | 4366 |
|
|
2016
Q1 | $9.28M | Buy |
+84,773
| New | +$9.24M | 0.05% | 331 |
|
|
2014
Q2 | – | Sell |
-152,058
| Closed | -$16.1M | – | 2898 |
|
|
2014
Q1 | $16.1M | Buy |
152,058
+92,741
| +156% | +$9.83M | 0.18% | 83 |
|
|
2013
Q4 | $6.2M | Buy |
+59,317
| New | +$6.26M | 0.09% | 177 |
|
|
2013
Q3 | – | Sell |
-27,230
| Closed | -$2.87M | – | 2951 |
|
|
2013
Q2 | $2.87M | Buy |
+27,230
| New | +$2.91M | 0.05% | 316 |
|
Other funds holding MBB
TWIM
TCIIS
Jane Street's MBB Position: Q1 2026 in Review
Jane Street opened a new position in iShares MBS ETF (MBB) in Q1 2026: 196,999 shares worth $18.7M. The stake represents ﹤0.01% of the portfolio and ranks #1840 among its holdings. This is a return to the name: Jane Street previously reported a position in MBB as recently as Q1 2025.
Jane Street first reported a position in MBB in Q2 2013 and has held it in 33 quarters since. The position peaked at $1.01B in Q2 2021. 1,019 funds tracked by Wall St. Rank hold MBB as of Q1 2026.
- Jane Street held 196,999 shares of iShares MBS ETF worth $18.7M as of Q1 2026.
- iShares MBS ETF was a new Jane Street position in Q1 2026.
- iShares MBS ETF made up ﹤0.01% of Jane Street's portfolio in Q1 2026, its #1840 holding.
- Jane Street first reported a position in iShares MBS ETF in Q2 2013 and has held it in 33 quarters since.
- Jane Street's iShares MBS ETF position peaked at $1.01B in Q2 2021.
- 1,019 funds tracked by Wall St. Rank held iShares MBS ETF as of Q1 2026.
Based on Jane Street's 13F filing for Q1 2026, filed 12 May 2026.