ETFs net sold $31.3 million of FormFactor on its first day in the S&P MidCap 400
FormFactor's S&P MidCap 400 debut on October 6 came with $367.9 million of ETF buying that had already printed before the effective date, then net selling of $31.3 million on the day itself, led by funds tied to the SmallCap 600 list the stock had just left. The shares closed their first session in the index down 4.5 percent and now sit below the analyst consensus they cleared.
Vincent Jiang · 3 min read
The buying the rule promised never printed on the day
FormFactor's first session in the S&P MidCap 400+2.30% — FormFactor's first session in the S&P MidCap 400, up 2.30 percent today was Tuesday, October 6, the morning funds tied to the index were obliged to add the stock 1. The ETF record shows them finishing the day as net sellers, $31.3 million out, nineteen funds buying against six selling in larger size, and no MidCap 400 tracker anywhere among the named trades 2. The stock fell 4.5 percent to $141.30 3. The inclusion trade, the one priced into every index promotion, never showed up on the day it was scheduled for.
The biggest sellers were leaving the old list
XSMO sold its entire holding, 722,471 shares, for $102.1 million 2. It is Invesco's S&P SmallCap Momentum ETF, a $2.91 billion fund whose momentum basket is culled from the S&P SmallCap 600 4. The number two seller, VIOG at $13.7 million, is Vanguard's S&P Small-Cap 600 Growth fund, built by full replication to hold every stock in its index 5.
The same S&P notice that promoted FormFactor to the MidCap 400 deleted it from the SmallCap 600, with Workiva taking the old seat 1. The third seller, RWJ at $1.4 million, is Invesco's S&P SmallCap 600 Revenue ETF, which re-weights the entire 600 list by revenue 6. On this record, the deletion likely pushed more money out of the 600's funds than the addition funneled through the 400's: the three largest sellers all track 600-derived lists, and their combined $117.2 million of sell-outs tops the whole day's $31.3 million net swing 2456.
Every big seller on the day ran a list FormFactor had just been deleted from
Data
| Net sale | |
|---|---|
| XSMO | -$102.1M |
| VIOG | -$13.7M |
| RWJ | -$1.4M |
The front-run crowd paid 102 times earnings
The buying did arrive, before the effective date: $68.9 million net on October 2 and $299.0 million on October 5, $367.9 million combined 2. That tape ran the stock to $149.31 on September 30 and $148.44 on October 1, 102.3 times trailing earnings against a five-year median of 42.4 71.
By the October 8 close it sat at $137.13, below the $145.44 average of eleven analyst targets it had cleared to get in 71. Inclusion is not a vote of confidence; it is a change of address, and the moving costs land on whoever bought the announcement.
The inclusion buying front-ran the effective date, then reversed on the day
Data
| Net ETF flow | |
|---|---|
| 30 Sep | -$0.1M |
| 1 Oct | $0.6M |
| 2 Oct | $68.9M |
| 5 Oct | $299M |
| 6 Oct | -$31.3M |
October 28 prices the unnamed customer
The bull case carries receipts: record second-quarter revenue of $258.2 million, up 32 percent, and a Deutsche Bank target of $200 built on a $500 million second-source opportunity at Nvidia+0.34% — Nvidia, up 0.34 percent today 1. The company itself has named only "a newly qualified GPU program," never the customer 1.
Insiders, for their part, sold $22.1 million over twelve months without buying a share; chief executive Mike Slessor filed a sale in every month of 2026 through September 1. The third quarter, guided to $270 million of revenue plus or minus $10 million, reports on October 28 89. That print decides whether the front-run crowd bought a business or a list.
Deepdive
AI-generated from this story and its cited sources. Not investment advice.
