How much did MIRM move each index today?
XBI: MIRM moved +1.41% and contributed +0.02 points of the index's +4.95-point move (0% of it), ranking #66 of 147 members by contribution to the move.
MIRM closed the 2026-08-25 session at 98.08; that day's move sits in the 70th percentile of its own past year. The stock is 23.7% below its 52-week closing high and +24.2% for the year so far.
MIRM in the XBI beyond today
| window | MIRM return | points contributed | index move | rank |
|---|---|---|---|---|
| 1 week | −2.77% | −0.05 pts | +9.00 pts | #138 of 147 |
| 1 month | −14.12% | −0.26 pts | +18.53 pts | #146 of 147 |
| quarter to date | −16.22% | −0.41 pts | +10.87 pts | #143 of 147 |
| year to date | +24.17% | −0.64 pts | +47.19 pts | #143 of 147 |
Who moved with and against MIRM today?
On MIRM's side of the XBI tape: MRNA (+0.60 pts), TWST (+0.23 pts), BEAM (+0.13 pts). Pulling the other way: PTGX (−0.06 pts), SLS (−0.03 pts), PCVX (−0.03 pts).
Every member's contribution, top to bottom, is on the index dashboards; the day's story is in the market-close note. Machine-readable figures for this stock: /api/stock/MIRM, free to cite with attribution.