InsiderSource
HOWL

Werewolf Therapeutics, Inc.

SEC CIK 1785530
$0.3810 −40.7% · 90 days
90-day buys
$0
0 open-market
90-day sells
$1.73M
41 open-market
Net insider flow
−$1.73M
Net selling
Filings shown
130
Most recent
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At a glance

Over the last 90 days, insiders at HOWL have sold a net $1.73M of stock (0 open-market buys vs 41 sells).

Largest recent trade: Mpm Bioventures 2014, L.p., HOWL's 10% owner, spent $2.01M of their own money on 125,759 shares at $16, growing their stake 4%.

Most active filer: Evnin Luke, with 59 transactions among the recent filings shown.

Insider transaction history

Form 4 filings for HOWL, newest first
View on SEC EDGAR ↗
HOWL
Werewolf Therapeutics, Inc.
Sell EVNIN LUKE · Director · Open-market sale · filed May 7, 2026 ΔOwn −4.8%

Evnin Luke sold $49.8K of HOWL, trimming their stake 5%.

−$49.8K
79,086 sh @ $1
HOWL
Werewolf Therapeutics, Inc.
Sell EVNIN LUKE · Director · Open-market sale · filed May 7, 2026 ΔOwn −0.9%

Evnin Luke sold $9.7K of HOWL, trimming their stake 1%.

−$9.7K
14,635 sh @ $1
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HOWL
Werewolf Therapeutics, Inc.
Sell EVNIN LUKE · Director · Open-market sale · filed May 4, 2026 ΔOwn −2.8%

Evnin Luke sold $34.5K of HOWL, trimming their stake 3%.

−$34.5K
47,963 sh @ $1
HOWL
Werewolf Therapeutics, Inc.
Sell EVNIN LUKE · Director · Open-market sale · filed May 4, 2026 ΔOwn −3.3%

Evnin Luke sold $42.6K of HOWL, trimming their stake 3%.

−$42.6K
58,394 sh @ $1
HOWL
Werewolf Therapeutics, Inc.
Sell EVNIN LUKE · Director · Open-market sale · filed May 4, 2026 ΔOwn −8.6%

Evnin Luke sold $121.1K of HOWL, trimming their stake 9%.

−$121.1K
168,262 sh @ $1
HOWL
Werewolf Therapeutics, Inc.
Sell EVNIN LUKE · Director · Open-market sale · filed Apr 29, 2026 ΔOwn −2.8%

Evnin Luke sold $39K of HOWL, trimming their stake 3%.

−$39K
56,559 sh @ $1
HOWL
Werewolf Therapeutics, Inc.
Sell EVNIN LUKE · Director · Open-market sale · filed Apr 29, 2026 ΔOwn −4.5%

Evnin Luke sold $69.7K of HOWL, trimming their stake 5%.

−$69.7K
95,412 sh @ $1
HOWL
Werewolf Therapeutics, Inc.
Sell EVNIN LUKE · Director · Open-market sale · filed Apr 29, 2026 ΔOwn −2.5%

Evnin Luke sold $45.8K of HOWL, trimming their stake 2%.

−$45.8K
53,940 sh @ $1
HOWL
Werewolf Therapeutics, Inc.
Sell EVNIN LUKE · Director · Open-market sale · filed Jan 20, 2026 ΔOwn −1.8%

Evnin Luke sold $20.9K of HOWL, trimming their stake 2%.

−$20.9K
38,782 sh @ $1
HOWL
Werewolf Therapeutics, Inc.
Sell EVNIN LUKE · Director · Open-market sale · filed Jan 15, 2026 ΔOwn −1.7%

Evnin Luke sold $20.6K of HOWL, trimming their stake 2%.

−$20.6K
37,413 sh @ $1
HOWL
Werewolf Therapeutics, Inc.
Sell EVNIN LUKE · Director · Open-market sale · filed Jan 15, 2026 ΔOwn −1.4%

Evnin Luke sold $17.5K of HOWL, trimming their stake 1%.

−$17.5K
30,616 sh @ $1
HOWL
Werewolf Therapeutics, Inc.
Sell EVNIN LUKE · Director · Open-market sale · filed Jan 15, 2026 ΔOwn −1.9%

Evnin Luke sold $23.8K of HOWL, trimming their stake 2%.

−$23.8K
43,198 sh @ $1
HOWL
Werewolf Therapeutics, Inc.
Sell EVNIN LUKE · Director · Open-market sale · filed Jan 12, 2026 ΔOwn −2.5%

Evnin Luke sold $33.6K of HOWL, trimming their stake 2%.

−$33.6K
58,980 sh @ $1
HOWL
Werewolf Therapeutics, Inc.
Sell EVNIN LUKE · Director · Open-market sale · filed Jan 12, 2026 ΔOwn −1.0%

Evnin Luke sold $15.1K of HOWL, trimming their stake 1%.

−$15.1K
24,678 sh @ $1
HOWL
Werewolf Therapeutics, Inc.
Sell EVNIN LUKE · Director · Open-market sale · filed Jan 7, 2026 ΔOwn −1.7%

Evnin Luke sold $26.5K of HOWL, trimming their stake 2%.

−$26.5K
40,761 sh @ $1
HOWL
Werewolf Therapeutics, Inc.
Sell EVNIN LUKE · Director · Open-market sale · filed Jan 7, 2026 ΔOwn −0.7%

Evnin Luke sold $11.8K of HOWL, trimming their stake 1%.

−$11.8K
18,378 sh @ $1
HOWL
Werewolf Therapeutics, Inc.
Sell EVNIN LUKE · Director · Open-market sale · filed Jan 2, 2026 ΔOwn −0.7%

Evnin Luke sold $11.7K of HOWL, trimming their stake 1%.

−$11.7K
18,568 sh @ $1
HOWL
Werewolf Therapeutics, Inc.
Sell EVNIN LUKE · Director · Open-market sale · filed Jan 2, 2026 ΔOwn −1.0%

Evnin Luke sold $15.5K of HOWL, trimming their stake 1%.

−$15.5K
24,962 sh @ $1
HOWL
Werewolf Therapeutics, Inc.
Sell EVNIN LUKE · Director · Open-market sale · filed Jan 2, 2026 ΔOwn −1.4%

Evnin Luke sold $21.3K of HOWL, trimming their stake 1%.

−$21.3K
34,847 sh @ $1
HOWL
Werewolf Therapeutics, Inc.
Sell EVNIN LUKE · Director · Open-market sale · filed Dec 29, 2025 ΔOwn −4.1%

Evnin Luke sold $66.2K of HOWL, trimming their stake 4%.

−$66.2K
108,606 sh @ $1
HOWL
Werewolf Therapeutics, Inc.
Sell EVNIN LUKE · Director · Open-market sale · filed Dec 29, 2025 ΔOwn −1.3%

Evnin Luke sold $22.4K of HOWL, trimming their stake 1%.

−$22.4K
35,632 sh @ $1
HOWL
Werewolf Therapeutics, Inc.
Sell EVNIN LUKE · Director · Open-market sale · filed Dec 29, 2025 ΔOwn −0.6%

Evnin Luke sold $10.6K of HOWL, trimming their stake 1%.

−$10.6K
16,310 sh @ $1
HOWL
Werewolf Therapeutics, Inc.
Sell EVNIN LUKE · Director · Open-market sale · filed Dec 29, 2025 ΔOwn −2.6%

Evnin Luke sold $45K of HOWL, trimming their stake 3%.

−$45K
71,428 sh @ $1
HOWL
Werewolf Therapeutics, Inc.
Sell EVNIN LUKE · Director · Open-market sale · filed Dec 29, 2025 ΔOwn −2.1%

Evnin Luke sold $40.9K of HOWL, trimming their stake 2%.

−$40.9K
59,307 sh @ $1
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About HOWL insider activity

This page tracks every recent Form 4 filed for Werewolf Therapeutics, Inc. with the U.S. Securities and Exchange Commission. Form 4 is the disclosure that company insiders — officers, directors, and holders of more than 10% of the stock — must file within two business days of buying or selling shares.

The summary above nets open-market purchases against open-market sales over the trailing 90 days. Open-market trades (codes P and S) tend to carry the most signal because they reflect a deliberate choice to put money in or take it out, as opposed to routine grants, option exercises, or tax-withholding events. Use the badges on each row to tell them apart, and always confirm details against the original filing before drawing conclusions.

Frequently asked questions

How often is HOWL insider data updated?

Continuously. We read from SEC EDGAR, so new Form 4 filings for Werewolf Therapeutics, Inc. usually appear here within minutes of being accepted by the SEC.

What does "net insider flow" mean?

It is the total dollar value of open-market insider purchases minus open-market sales over the last 90 days. A positive number (green) means insiders bought more than they sold; a negative number (red) means the reverse.

Why do some rows show grants or option exercises instead of buys?

Insiders receive stock through compensation as well as buying it outright. Form 4 captures all of these. We label each transaction by its SEC code so you can focus on open-market activity if you prefer.

Is this investment advice?

No. InsiderSource presents public filing data for informational purposes only. Insider activity is one of many factors to consider and is never a recommendation to buy or sell.