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Hyliion HYLN

US equityMarket cap rank #3522
$3.85 −$0.19 (-4.70%)
Pre-market · Oct 8, 8:20 am ET · After hours $3.89 +1.04%
Open$3.98
Prev close$4.04
Day range$3.81 – $4.00
Volume1.59M
Market cap$687.60M
P/E (TTM)–
Dividend yield–

Ownership & positioning

Who holds it, who is betting against it, and where the big money is moving

Institutional ownership39.1%+0.06 pts vs. prior quarter
Institutions holding198-1 vs. prior quarter
Insider trades (recent)21 buys / 29 sellsNet selling
Short interest8.95% of floatDays to cover 10.5 · as of 15 Sep 2026
Short-sale volume share17.7%5-day average of daily volume

Short-sale volume as % of daily volume

7%17%26%36%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: +$393.3K (9 inflow days, 11 outflow days).

Net flow by order size, last 20 sessions

+$538.6KSuper−$145.4KBig+$27.9KMid+$212.7KSmall

Super/Big orders approximate institutional-size trades; Mid/Small approximate retail-size trades. Net buy minus sell value in each bucket, summed over the window.

The five largest holders on file together own 37.0% of shares outstanding.

Largest holders

  • Thomas Healy18.59%
  • BlackRock6.41%
  • Colle Capital Partners LP5.35%
  • Vanguard Capital Management, LLC3.58%
  • General Electric Company3.08%
  • D. E. Shaw & Co., L.P.2.18%
  • Geode Capital Management, LLC1.85%
  • State Street Global Advisors1.60%

By investor type

  • Mutual Fund22.78%
  • Individual/Insider21.75%
  • Hedge Fund5.72%
  • VC/PE Fund5.35%
  • Public Company3.86%
  • Family Office/Trust0.54%
  • Private Company0.41%
  • Government Pension Fund0.24%

Reported short interest has risen from 6.34% to 8.95% of float over the last 6 biweekly reports (30 Jun 2026 to 15 Sep 2026).

Recent institutional activity

HolderTypePeriodShare changeNew stake
Thomas Healy Individual/Insider 2026/Q3 +394,449 18.6%
Nuveen Asset Management LLC Insurance Company 2026/Q3 +311,261 0.2%
BlackRock Mutual Fund 2026/Q3 +2,567,455 6.4%
D. E. Shaw & Co., L.P. Hedge Fund 2026/Q3 +2,423,614 2.2%
T. Rowe Price Group, Inc. Mutual Fund 2026/Q3 +1,630,192 1.0%
Palisades Investment Partners, LLC Mutual Fund 2026/Q3 +907,933 0.5%
UBS Asset Management Mutual Fund 2026/Q3 +822,521 0.8%
Acadian Asset Management LLC Mutual Fund 2026/Q3 +763,403 0.5%
Vanguard Portfolio Management, LLC Mutual Fund 2026/Q3 +537,052 0.8%
Millennium Management LLC Hedge Fund 2026/Q3 +509,714 1.1%
Franklin Resources Mutual Fund 2026/Q3 +442,231 0.3%
Centerbook Partners LP Hedge Fund 2026/Q3 +297,107 0.2%
Two Sigma Investments, LP Hedge Fund 2026/Q3 +287,887 0.2%
Clough Capital Partners, LP Hedge Fund 2026/Q3 +274,500 0.2%
Raymond James Financial, Inc. Public Company 2026/Q3 +239,042 0.1%

Institutional buy/sell activity by reporting period, largest moves first.

Insider transactions

DateInsiderTitleTransactionSharesPriceHeld after
29 Sep 2026 Vincent Cubbage Independent Director Other Disposition -5,750 – 1,064,637
29 Sep 2026 Jose Oxholm VP, General Counsel & Chief Compliance Officer Derivative Exercise and Retained +123,733 – 696,848
29 Sep 2026 Jon Panzer Chief Financial Officer Derivative Exercise and Retained +134,667 – 877,278
29 Sep 2026 Thomas Healy Chief Executive Officer Derivative Exercise and Retained +424,289 – 33,206,711
29 Sep 2026 Greg Standley Former Vice President of Finance & Accounting Derivative Exercise and Retained +34,183 – 199,666
29 Sep 2026 Joshua Mook Chief Technology Officer Derivative Exercise and Retained +127,322 – 507,864
20 Sep 2026 Jose Oxholm VP, General Counsel & Chief Compliance Officer Other Disposition -50,000 – 573,115
26 Aug 2026 Vincent Cubbage Independent Director Open Market Acquisition +50,000 $3.40 1,070,387
20 Aug 2026 Jose Oxholm VP, General Counsel & Chief Compliance Officer Other Disposition -11,980 $3.33 623,115
20 Aug 2026 Jon Panzer Chief Financial Officer Other Disposition -13,595 $3.32 742,611
20 Aug 2026 Thomas Healy Chief Executive Officer Other Disposition -29,840 $3.33 32,782,422
20 Aug 2026 Joshua Mook Chief Technology Officer Other Disposition -10,700 $3.33 380,542
20 Aug 2026 Govindaraj Ramasamy Chief Commercial Officer Other Disposition -6,670 $3.37 440,208
18 Aug 2026 Greg Standley Former Vice President of Finance & Accounting Other Disposition -3,731 $3.73 165,483
25 Jun 2026 Thomas Healy Chief Executive Officer Other Disposition -2,500,000 – 32,812,262
25 May 2026 Vincent Cubbage Independent Director Other Disposition -11,500 – 1,020,387
19 May 2026 Jose Oxholm VP, General Counsel & Chief Compliance Officer Other Disposition -11,576 $4.06 608,860
19 May 2026 Jon Panzer Chief Financial Officer Other Disposition -8,065 $4.06 726,524
19 May 2026 Thomas Healy Chief Executive Officer Other Disposition -28,026 $4.08 35,312,262
19 May 2026 Joshua Mook Chief Technology Officer Other Disposition -6,803 $4.06 366,591

From Form 4/Form 144 filings. Negative share counts are disposals (sales, gifts, or shares withheld for taxes); positive are acquisitions.

Short interest, by report

Report dateShares short% of floatDays to cover
15 Sep 2026 15,990,447 9.0% 10.5
31 Aug 2026 17,697,586 9.9% 7.4
14 Aug 2026 17,826,174 10.0% 4.3
31 Jul 2026 16,560,477 9.3% 5.9
15 Jul 2026 15,120,944 8.5% 5.4
30 Jun 2026 11,299,745 6.3% 1.8

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