Five Times MTF Cracked. Only Once Was It A Flush.Nifty 50 IndexNSE:NIFTYmitrakmt123India's MTF book sits at ₹1,58,403.65 Cr as of September 29 — an all-time high, up 13.3% in sixty trading days. That number is worth pausing on only because it's now big enough to make a useful exercise possible: take the five times this book has visibly contracted under stress since 2017, apply the same percentage decline to today's much larger number, and look honestly at what the market actually did each of those five times. Not a forecast of what happens next — a replay of what's already on record. Covid, March 2020, is the only real flush in the dataset. The book fell 53.8%, from ₹6,620 Cr to ₹3,061 Cr — tiny by today's standard. Apply that same percentage to today's ₹1,58,403.65 Cr book and ₹85,221 Cr gets erased, leaving ₹73,182 Cr outstanding. This is also the one episode where the index moved on a comparable scale: Nifty 50 fell roughly 38% peak to trough, from its January 2020 high to the March 23 low. The book was small, mutual fund buying had nowhere near today's firepower, and forced selling and falling prices fed each other with nothing offsetting it. The 2022 rate-hike cycle barely scratched the book. January to June 2022, MTF fell just 5.0% — ₹23,737 Cr to ₹22,544 Cr — and was back above its starting level by the end of the same window. Scaled to today's book, a 5.0% decline erases ₹7,920 Cr, landing at ₹1,50,483 Cr. Barely a dent against an all-time high. October 2024 is the single most important data point in this dataset. FII sold ₹91,934 Cr of equity that month — the largest monthly outflow on record outside a war period. MTF fell only 5.5%, from ₹82,020 Cr to ₹77,482 Cr, because mutual funds bought ₹91,433 Cr the same month — near one-for-one absorption. Scaled to today's book, that 5.5% erases ₹8,712 Cr, landing at ₹1,49,691 Cr. The book was back above its pre-event level within two months. February 2025's tariff shock produced a slightly deeper dent. MTF fell 8.4%, from ₹77,874 Cr to ₹71,327 Cr, against a ₹46,600 Cr FII outflow matched by ₹47,934 Cr of MF buying. Scaled to today: ₹13,306 Cr erased, book at ₹1,45,098 Cr. It recovered to a new high the following month. March 2026's Iran war episode is the steepest non-Covid decline in the record. FII sold ₹1,12,307 Cr — the largest outflow in the dataset — and MF buying of ₹98,746 Cr absorbed most, not all, of it. MTF fell 10.0%, from ₹1,17,689 Cr to ₹1,05,920 Cr. Scaled to today's book, that's ₹15,840 Cr erased, landing at ₹1,42,563 Cr. The book recovered to a new high within two months. What this actually shows: four of the last five times India's MTF book has visibly cracked, the decline landed somewhere between 5% and 10%, and fully recovered within one to two months — because mutual fund buying absorbed the FII selling that triggered the contraction, every single time. Only once, when the book was a fraction of its current size and the structural SIP pipeline barely existed, did the deleveraging reach flush scale — and only then did the index move by a comparable order of magnitude. What I am not doing here: I am not attaching an index-fall number to the four non-Covid scenarios above. There's no fixed ratio between "MTF falls X%" and "Nifty falls Y%" to begin with — October 2024 alone, the largest FII outflow on record, proves the size of the shock and the size of the market move don't travel together without DII absorption as the variable in between. I'm also not claiming today's absorption capacity will hold a fifth time the way it's held four times running — only that it has held four times running. Today's book is roughly 24 times the size of Covid's pre-crash book, sitting at a fresh all-time high. Whether the next real contraction looks like the four quiet ones or the one loud one isn't something this dataset can call in advance. That gets logged when it happens, not predicted before it does.