Heidrick & Struggles International, Inc. (HSII)
HSII moved a median of 0.00% 30 minutes after news, and +0.03% by the close. How HSII actually reacts to news — the realized, point-in-time move the market made, measured across 269 labeled events over the last three years with zero look-ahead.
HSII’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | 0.00% | 48% | 232 |
| 30-min | 0.00% | 50% | 238 |
| 60-min | +0.08% | 56% | 238 |
| to close | +0.03% | 51% | 237 |
| Middle 50% of HSII reactions | -0.60% to +0.43% |
|---|---|
| Median reaction (30-min) | 0.00% |
| Measured reactions | 269 |
Half of all Heidrick & Struggles International, Inc. news events land between -0.60% and +0.43% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
Email me when HSII moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to HSII's baseline. Nothing else.
Recent HSII events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Heidrick & Struggles lanceert Heidrick Immersive, een door AI ondersteund platform om leiderschap in actie te observeren | Press release | PR Newswire | — | — | |
| Heidrick & Struggles Launches Heidrick Immersive, an AI-Enhanced Platform for Observing Leadership in Motion | Press release | PR Newswire | — | — | |
| Form 15-12G HEIDRICK & STRUGGLES | SEC filing · Form 15-12G | SEC EDGAR | — | — | |
| Form 8-K HEIDRICK & STRUGGLES For: Dec 10 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form S-8 POS HEIDRICK & STRUGGLES | SEC filing · Form S-8 | SEC EDGAR | — | — | |
| Heidrick & Struggles Completes Take-Private Transaction Backed by Advent International, Corvex Private Equity and a Global Network of Strategic Investors | Press release | PR Newswire | — | — | |
| Form 8-K HEIDRICK & STRUGGLES For: Dec 05 | SEC filing · Form 8-K | SEC EDGAR | +0.10% | +0.00% | |
| Heidrick & Struggles Expands Presence and Capabilities in the Middle East | Press release | PR Newswire | +0.03% | +0.03% | |
| Halper Sadeh LLC Encourages HSII, PRO, TRUE Shareholders to Contact the Firm to Discuss Their Rights | Press release | PR Newswire | +0.07% | +0.05% | |
| Form 8-K HEIDRICK & STRUGGLES For: Nov 17 | SEC filing · Form 8-K | SEC EDGAR | +0.09% | +0.10% | |
| STOCKHOLDER NOTICE: Kaskela Law LLC Announces Investigation into Fairness of Proposed $59.00 Per Share Buyout of Heidrick & Struggles (NASDAQ: HSII) Stockholders and Encourages HSII Investors to Contact the Firm to Maximize Their Investment | Press release | PR Newswire | +0.02% | +0.03% | |
| Form 10-Q HEIDRICK & STRUGGLES For: Sep 30 | SEC filing · Form 10-Q | SEC EDGAR | +0.14% | +0.53% | |
| Form 8-K HEIDRICK & STRUGGLES For: Nov 03 | SEC filing · Form 8-K | SEC EDGAR | +0.14% | +0.53% | |
| Form DEFM14A HEIDRICK & STRUGGLES | SEC filing · Form DEFM14A | SEC EDGAR | +0.14% | +0.53% | |
| Heidrick & Struggles Delivers 16% Revenue Growth in Q3, Driving Strong Profitability | Press release | PR Newswire | +0.14% | +0.53% | |
| HALPER SADEH LLC ENCOURAGES GES, DAY, HSII SHAREHOLDERS TO CONTACT THE FIRM TO DISCUSS THEIR RIGHTS | Press release | PR Newswire | — | -0.03% | |
| Form PREM14A HEIDRICK & STRUGGLES For: Oct 24 | SEC filing · Form PREM14A | SEC EDGAR | +0.00% | +0.19% | |
| HALPER SADEH LLC ENCOURAGES HSII, VMEO SHAREHOLDERS TO CONTACT THE FIRM TO DISCUSS THEIR RIGHTS | Press release | PR Newswire | +0.00% | +0.19% | |
| BRODSKY & SMITH SHAREHOLDER UPDATE: Notifying Investors of the Following Investigations: Heidrick & Struggles International, Inc. (Nasdaq - HSII), Comerica Incorporated (NYSE - CMA), Veeco Instruments Inc. (Nasdaq - VECO), Tourmaline Bio, Inc. (Nasdaq - T | Press release | GlobeNewswire | +0.03% | +0.05% | |
| Form DEFA14A HEIDRICK & STRUGGLES | SEC filing · Form DEFA14A | SEC EDGAR | +0.03% | +0.05% | |
| Heidrick & Struggles sluit een definitieve overeenkomst met een investeerdersconsortium onder leiding van Advent International en Corvex om een besloten vennootschap te worden | Press release | PR Newswire | +0.10% | -0.22% | |
| Form 8-K HEIDRICK & STRUGGLES For: Oct 05 | SEC filing · Form 8-K | SEC EDGAR | +0.16% | +0.29% | |
| Form DEFA14A HEIDRICK & STRUGGLES | SEC filing · Form DEFA14A | SEC EDGAR | -0.03% | +0.10% | |
| Heidrick & Struggles Enters into Definitive Agreement with Investor Consortium Led by Advent International and Corvex to Become a Private Company | Press release | PR Newswire | -0.05% | +0.12% | |
| HSII Stock Alert: Halper Sadeh LLC Is Investigating Whether the Sale of Heidrick & Struggles International, Inc. Is Fair to Shareholders | Press release | Business Wire | +0.03% | -0.10% | |
| Heidrick & Struggles to Participate in William Blair's Inaugural Human Capital Services Virtual Conference | Press release | PR Newswire | +0.47% | +0.10% | |
| Form 10-Q HEIDRICK & STRUGGLES For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | +2.78% | -7.63% | |
| Form 8-K HEIDRICK & STRUGGLES For: Aug 04 | SEC filing · Form 8-K | SEC EDGAR | +2.78% | -7.63% | |
| Heidrick & Struggles Delivers 14% Revenue Growth in Q2, Driving Strong Profitability | Press release | PR Newswire | +2.78% | -7.63% | |
| Heidrick & Struggles to Release 2025 Second Quarter Results | Press release | PR Newswire | +0.09% | +1.69% | |
| Form 8-K HEIDRICK & STRUGGLES For: May 22 | SEC filing · Form 8-K | SEC EDGAR | +0.60% | +0.87% | |
| Heidrick & Struggles to Participate in Baird's 2025 Global Consumer, Technology & Services Conference | Press release | PR Newswire | -0.82% | +0.89% | |
| Heidrick & Struggles to Participate in Needham Technology, Media, & Consumer Conference | Press release | PR Newswire | +0.23% | +3.38% | |
| Form 10-Q HEIDRICK & STRUGGLES For: Mar 31 | SEC filing · Form 10-Q | SEC EDGAR | -0.20% | +4.20% | |
| Form 8-K HEIDRICK & STRUGGLES For: May 05 | SEC filing · Form 8-K | SEC EDGAR | -0.20% | +4.20% | |
| Heidrick & Struggles Delivers 7% Revenue Growth in Q1, Driving Strong Profitability | Press release | PR Newswire | -0.20% | +4.20% | |
| Heidrick & Struggles Appoints a New Managing Partner for Their CEO & Board Practice in Europe and Africa | Press release | Business Wire | +1.68% | +1.12% | |
| Heidrick & Struggles lanceert wereldwijde Government & Defense Tech-afdeling als onderdeel van disruptieve technologische bevordering | Press release | PR Newswire | -0.72% | +0.38% | |
| Heidrick & Struggles Launches Global Government & Defense Tech Practice in Frontier Tech Push | Press release | Canada Newswire | -0.69% | +1.32% | |
| Heidrick & Struggles to Release 2025 First Quarter Results | Press release | PR Newswire | +0.05% | +0.80% | |
| Heidrick & Struggles Announces Promotions of Partners Across Executive Search and Heidrick Consulting | Press release | Canada Newswire | -0.63% | -0.31% | |
| Heidrick & Struggles kondigt benoemingen van partners bij Executive Search en Heidrick Consulting aan | Press release | PR Newswire | -0.63% | -0.31% | |
| Form ARS HEIDRICK & STRUGGLES For: Dec 31 | SEC filing · Form ARS | SEC EDGAR | -0.63% | +0.80% | |
| Form DEF 14A HEIDRICK & STRUGGLES For: May 22 | SEC filing · Form DEF | SEC EDGAR | -0.63% | +0.80% | |
| Form 8-K HEIDRICK & STRUGGLES For: Mar 17 | SEC filing · Form 8-K | SEC EDGAR | +0.99% | +1.73% | |
| Sidoti Events, LLC's Virtual March Small-Cap Conference | Press release | ACCESS Newswire | +0.39% | +0.61% | |
| Heidrick & Struggles to Participate in the Sidoti Virtual Investor Conference | Press release | PR Newswire | -3.16% | -2.85% | |
| Form 10-K HEIDRICK & STRUGGLES For: Dec 31 | SEC filing · Form 10-K | SEC EDGAR | +4.86% | +6.01% | |
| Form 8-K HEIDRICK & STRUGGLES For: Mar 03 | SEC filing · Form 8-K | SEC EDGAR | +4.86% | +6.01% | |
| Heidrick & Struggles Posts 9% Revenue Growth in Q4 with Strong Profitability | Press release | PR Newswire | +4.86% | +6.01% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the HSII section they belong to.
Where else HSII is measured.
HSII earnings → · Analyst actions → · SEC filings →
Other Industrials names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| Simpson Manufacturing Company, Inc. (SSD) | 270 | -0.23% | 41% |
| AMERICAN OUTDOOR BRANDS CORP (AOBC) | 269 | -0.01% | 49% |
| Park-Ohio Holdings Corp. (PKOH) | 268 | 0.00% | 47% |
| ZTO Express (Cayman) Inc. American Depositary Shares, each representing one Class A ordinary share. (ZTO) | 268 | -0.04% | 49% |
Same sector, same measurement: percent move vs. the price at the news timestamp, read at 30 minutes. Sample sizes differ, so the medians are comparable but the confidence behind them is not.
All Industrials names, measured the same way →
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How the numbers are made.
How is Heidrick & Struggles International, Inc.'s median reaction calculated?
Every labeled HSII news event is measured from its own timestamp: the last trade before the news is the base price, and the move is read at fixed horizons — 30 minutes of trading, then the close. The median across 269 events is what this page reports. Point-in-time, zero look-ahead: no event borrows information from a later one.
What counts as a positive reaction?
Any event whose price move is above zero at the horizon, relative to the last trade before the news timestamp. 50% of HSII's measured events are up at 30 minutes; the rest close the window flat or negative.
How often is this page updated?
The news table refreshes automatically as new events are labeled and priced. The reaction medians are re-pulled in batches from the dataset — the figures here are as of 2026-09-21.
Does HSII's past reaction predict its next one?
No. These are realized facts about past events, not forecasts. They describe a distribution — they say nothing certain about any future move.