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Synthomer plc Stock: price and insider trades · United Kingdom
No insider purchase over the last 90 days. The latest was filed 12 Nov 2025.
Synthomer plc: what insiders have been doing
Headquartered in Harlow, United Kingdom, Synthomer plc is a listed company and traces its origins to 1863. Filings by its managers are published through RNS (LSE). 2 insiders have disclosed 5 filings since 18 October 2025.
The flow runs one way only: 1 insider bought (1 purchase totalling €35k) and nobody sold on the market. Open-market purchases are the filings investors watch most closely, because the insider pays for the shares out of pocket. Biggest ticket of the year: €35k, bought by Michael Willome and made public on 12 November 2025. On the buying side, the filings list 1 chief executive among the declarants.
Compared with its exchange (833 companies, median 6 filings), a count of 5 filings is below the norm. Since 2023, the database holds 23 purchases and 2 sales by insiders of the company.
The most recent open-market purchase was published on 12 November 2025, 339 days ago. The median gap between a trade and its publication by RNS (LSE) is 1 day. For comparison, UK MAR gives managers three business days to notify a trade.
Every figure here comes from the filings published by RNS (LSE) and describes the past, not future prices; it is not investment advice.
Insider Decl.
40
Thresholds
n/a
Buy Volume
€2M
23 ops. · all time
Sell Volume
€194,848
2 ops. · all time
Who traded when
BuySaleMichael Willome1 buy1 sale
Janet Ashdown1 buy
Jonathan Silver1 buy
Lily Liu1 buy
Peter Hill, CBE1 buy
Uwe Halder1 buy
This score ranks the purchase within its own market. A position size is suggested only on the venues of the backtested strategy universe; elsewhere, signals stay on watch. Not investment advice.
Fundamental score
Ranked 20,521 of 24,148 companies
26.8
score / 100
Value40
Quality14
FCF yld19%
Earn yld-84%
EV/EBITDA18.7x
ROE-13%
Gross mgn18%
Net mgn-9.0%
Debt/EBITDA15.2x
Pillars2/3
Transparent value + quality ranking, distinct from the insider signal.
Financial data
as of FY 2025FY ended December 2025 · cache
£1.07
Analyst consensus
4 analysts2.50/5
£1.00Target £1.28(+20%)£2.00
Income statement
Revenue£1.7B
Gross profit£307.3M18% margin
EBITDA£53.9M3% margin
Net income-£157M-6.7% margin
Valuation
PER (forward)3088.9x
P/Book19.1x
Beta1.00
Balance sheet & cash
Market cap£175.4M
Total debt£818.5M
Free Cash Flow£36.6M
Debt / Equity96%
Profitability & ownership
ROE-13.2%
ROA1.0%
% insiders27.8%
% institutions35.5%
Last declaration on 26 June 2026
Declarations40 total
3,096,474 sharesN/A - outside a trading venueISIN GB00BNTVWJ75RNS:bbfd3f08-dbfc-47f8-91e6-a49e0f1fd887
3,096,474 sharesN/A - outside a trading venueISIN GB00BNTVWJ75RNS:9640070
67,000 shares@ £0.63759.0% of flowLondon Stock Exchange (LON)ISIN GB00BNTVWJ75RNS:7099dc89-018e-4c18-99a1-299e051d111d
63,000 shares@ £0.49186.4% of flowLondon Stock Exchange (LON)ISIN GB00BNTVWJ75RNS:30773bc9-6406-4b24-b500-95e8b1154b5b
Canonical exit: 9 Feb 2026 (T+90)
25,000 shares@ £0.637100.0% of flowLondon Stock Exchange (LON)ISIN GB00BNTVWJ75RNS:5774095
Canonical exit: 5 Nov 2025 (T+90)
59,229 shares@ £0.655100.0% of flowLondon Stock Exchange (LON)ISIN GB00BNTVWJ75RNS:5769680
Canonical exit: 4 Nov 2025 (T+90)
19,920 shares@ £0.99100.0% of flowLondon Stock Exchange LON)ISIN GB00BNTVWJ75RNS:5725227
Canonical exit: 1 Oct 2025 (T+90)
47,000 shares@ £1.205812.3% of flowLondon Stock Exchange LON)ISIN GB00BNTVWJ75RNS:5593337
50,000 shares@ £1.16100.0% of flowLondon Stock Exchange (XLON)ISIN GB00BNTVWJ75RNS:5591281
Canonical exit: 23 Jun 2025 (T+90)
1,526,057 sharesN/AISIN GB00BNTVWJ75RNS:5588344
70,000 shares@ £1.18517.9% of flowLondon Stock Exchange LON)ISIN GB00BNTVWJ75RNS:5576086
0LondonISIN GB0009887422RNS:5516047
714,260 sharesN/AISIN GB00BNTVWJ75RNS:5158505
47,000 shares@ £2.38323.7% of flowLondon Stock Exchange LON)ISIN GB00BNTVWJ75RNS:5124228
90,982 shares@ £1.868529.5% of flowLondon Stock Exchange (XLON)ISIN GB00BNTVWJ75RNS:4959181-0
Canonical exit: 28 Jan 2024 (T+90)
90,982 shares@ £1.867529.5% of flowLondon Stock Exchange (XLON)ISIN GB00BNTVWJ75RNS:4959181-1
10,000 shares@ £1.85100.0% of flowLondon Stock Exchange (XLON)ISIN GB00BNTVWJ75RNS:4945329
Canonical exit: 18 Jan 2024 (T+90)
39,376 shares@ £1.9790.7% of flowLondon Stock Exchange, Main Market (XLON)ISIN GB00BNTVWJ75RNS:4940379-0
Canonical exit: 11 Jan 2024 (T+90)
25 of 40 declarations
About Synthomer plc
Synthomer plc is a company specializing in the manufacture of polymers and chemical products. It operates primarily in the UK and internationally, providing solutions for various sectors including automotive and construction.
