Workiva to Join the S&P SmallCap 600 on Oct. 6 as Index Reshuffle Ripples Through Tech Names
Workiva’s S&P SmallCap 600 addition is the key catalyst investors are reacting to
Workiva Inc. (NYSE: WK) was named as an addition to the S&P SmallCap 600, effective prior to the opening of trading on Tuesday, Oct. 6, according to a press release from S&P Dow Jones Indices dated Oct. 1, 2026.
As of 11:00 AM during market hours, WK was trading at $71.90, up $2.27 (3.26%).
The index change is tied to a chain reaction triggered by Twilio’s move up to the S&P 500
WK’s addition is part of a set of coordinated index changes spanning the S&P 500, S&P MidCap 400, and S&P SmallCap 600. In the published sequence, Twilio Inc. (NYSE: TWLO) is set to replace Warner Bros. Discovery, Inc. (NASD: WBD) in the S&P 500. Formfactor Inc. (NASD: FORM) will replace Twilio in the S&P MidCap 400, and Workiva will replace Formfactor in the S&P SmallCap 600.
The Oct. 6 effective-date schedule clearly places WK as a SmallCap 600 “addition” replacing Formfactor
| Effective Date | Index Name | Action | Company Name | Ticker | GICS Sector |
|---|---|---|---|---|---|
| Oct 6, 2026 | S&P SmallCap 600 | Addition | Workiva | WK | Information Technology |
| Oct 6, 2026 | S&P SmallCap 600 | Deletion | Formfactor | FORM | Information Technology |
In other words, the index provider’s published summary directly frames Workiva as the incoming S&P SmallCap 600 name, with FORM moving out of the SmallCap 600 as it moves up to the MidCap 400.
WK sits inside a broader multi-index rebalance that also includes M&A-driven deletions
The same release outlines other changes across S&P indices. In addition to the Twilio and Workiva-related moves, S&P said Vylor Inc. (NYSE: VYLR) was added to the S&P 500 on Oct. 1 following the completion of Corteva’s spin-off of Vylor. Separately, S&P cited ongoing deal processes: Skyworks Solutions Inc. (NASD: SWKS) is acquiring Qorvo, Inc. (NASD: QRVO), and Paramount Skydance Corp. (NASD: PSKY) is acquiring Warner Bros. Discovery, with both transactions described as expected to complete soon pending final closing conditions.
The published index summary shows how WK’s entry fits into a larger “promotion/demotion” ladder
| Effective Date | Index Name | Action | Company Name | Ticker | GICS Sector |
|---|---|---|---|---|---|
| Oct 6, 2026 | S&P 500 | Addition | Twilio | TWLO | Information Technology |
| Oct 6, 2026 | S&P MidCap 400 | Addition | Formfactor | FORM | Information Technology |
| Oct 6, 2026 | S&P SmallCap 600 | Addition | Workiva | WK | Information Technology |
This “step-up” structure—TWLO into the S&P 500, FORM into the MidCap 400, and WK into the SmallCap 600—highlights that Workiva’s inclusion is occurring as part of a systematic reshuffle rather than a standalone event.
WK’s market snapshot shows investors positioning ahead of the Oct. 6 inclusion date
| Time (Market Hours) | WK Price | Change | Percent Change |
|---|---|---|---|
| As of 11:00 AM | $71.90 | $2.27 | 3.26% |
With S&P’s effective date set for Oct. 6 prior to the open, WK’s move during market hours reflects attention to the upcoming index event described in the release.
The bottom line: WK is being pulled into the S&P SmallCap 600 via a tech-sector reshuffle across S&P indices
S&P Dow Jones Indices’ schedule makes Workiva’s role explicit: it is slated to enter the S&P SmallCap 600 as Formfactor exits to join the S&P MidCap 400, itself a knock-on effect of Twilio moving into the S&P 500. For WK shareholders, the central near-term milestone cited in the announcement is the Oct. 6 effective inclusion prior to the opening bell.
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