About 13% overall. As a group they ended with more shares than they started with. These figures leave out James Foster, the largest holder (holdings couldn't be fully reconciled).
| Who | Shares | Price | % of total stake | Total stake after | Trade date | Filed |
|---|---|---|---|---|---|---|
| Shannon Parisotto CEVP, Disc & Safety Assessment | 981 | $308.44 | 2.2% | 43K | Oct 5, 2026 | Oct 7, 2026 |
"% of total stake" is the shares in this event against all the vested shares the person held that day, across every share class and holding entity, after that day's vesting. "n/a" means the person's holdings don't reconcile, or the row is a purchase. "Holdings record incomplete" means more shares were sold than the filings show the person held that day, so a percentage would be wrong.
| Who | Shares | Price | % of total stake | Total stake after | Trade date | Filed |
|---|---|---|---|---|---|---|
| Glenn Coleman EVP & Chief Financial Officer | 10 | $297.43 | n/a | 28K | Sep 30, 2026 | Oct 2, 2026 |
"% of total stake" is the shares in this event against all the vested shares the person held that day, across every share class and holding entity, after that day's vesting. "n/a" means the person's holdings don't reconcile, or the row is a purchase. "Holdings record incomplete" means more shares were sold than the filings show the person held that day, so a percentage would be wrong.
Percentages cover 17 of 20 officers and directors. Left out: James Foster (holdings couldn't be fully reconciled); Nancy Andrews (most of their shares vested during the period, so a percentage would mislead); Glenn Coleman (held no vested shares at the start). Disclosed company stock is not an insider's whole wealth.
Officers and directors, past 12 months. Each bar is the insider's vested stake at the start of the period (Oct 8, 2025). The gold part is what they sold.
Officers and directors, Oct 2025 to Oct 2026. Each sale is counted once: under a disclosed plan, else to cover taxes, else no plan disclosed.
Yes. Birgit Girshick sold 6.5K shares ($1.8M, 9.9% of starting holdings) in the past 12 months, all of it under a trading plan disclosed in the filings.
Filings rarely give a reason, and we don't guess at one. What they show is how the sales were made: 93% of sales by value ran under 10b5-1 trading plans disclosed in the filings and 7% had no disclosed plan. A trading plan schedules sales in advance.
Yes. 2 officers or directors reported 2 purchases in the past 12 months (Form 4 code P, which includes private purchases).
About 13% overall. As a group they ended with more shares than they started with. These figures leave out James Foster, the largest holder (holdings couldn't be fully reconciled). That covers the 12 months to Oct 8, 2026 and counts vested shares reported on SEC Forms 3, 4 and 5, which is not an insider's whole wealth.
| Who sold | Amount | % of holdings | Trading plan |
|---|---|---|---|
| James Foster Director | $34.8M 137K shares | iNo percentage: holdings couldn't be fully reconciled. | Disclosed plan |
| Shannon Parisotto CEVP, Disc & Safety Assessment | $3.3M 12K shares | 28% | Disclosed plan |
| Birgit Girshick Chief Executive Officer, Director | $1.8M 6.5K shares | 9.9% | Disclosed plan |
| Michael Knell SVP, Finance and CAO | $1.7M 6.6K shares | 63% | No plan disclosed |
| Victoria Creamer EVP & Chief People Officer | $1.1M 4.2K shares | 19% | No plan disclosed |
| Nancy Andrews Director | $163K 573 shares | 6%†i† Most of the shares Nancy Andrews sold arrived during the period, so this is shares sold as a share of the 4K held at the start plus the 6K received, less 0 withheld by the company for taxes. | No plan disclosed |
Vested shares across all share classes, held directly and through trusts, LLCs and family members, as reported on SEC Forms 3, 4 and 5. Unvested awards and options are never counted as owned shares.
| Insider | Held Oct 8, 2025 | Sold | Held Oct 8, 2026 | Still held | ||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
James Foster!Holdings couldn't be fully reconciled. Balance changed with no matching transaction and no footnote: -14,577 shares on Jan 30, 2026 (2024 GRAT). See the filing Sales and other transactions for James Foster are complete. Director | n/a | −137K | n/a | n/a | ||||||||||||||||||||||||||||||||||||||||||||||||||||
Vesting, gifts, unvested awards and holding lines for James Foster+62Kshares vested or exercised 0gifted (net of own trusts) −16Kwithheld by the company for taxes none reportedunvested awards, start → end
Holdings couldn't be fully reconciled. Balance changed with no matching transaction and no footnote: -14,577 shares on Jan 30, 2026 (2024 GRAT). The balances below are as reported, not verified totals.
Additional holdings last reported Feb 26, 2018, not confirmed since: 92,150 shares. Not included in any total or percentage on this page.
Stock options (not counted as shares):
Estimate: options held × ($308.44 − strike price), using the most recent insider trade price on Form 4 (Oct 5, 2026), not a market close. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Birgit GirshickiIncludes unvested RSUs, amount not disclosed. Chief Executive Officer, Director | 66K | −6.5K | 79K | +20% | ||||||||||||||||||||||||||||||||||||||||||||||||||||
Vesting, gifts, unvested awards and holding lines for Birgit Girshick+6.5Kshares vested or exercised −856gifted (net of own trusts) −5.3Kwithheld by the company for taxes none reportedunvested awards, start → end
Stock options (not counted as shares):
Estimate: options held × ($308.44 − strike price), using the most recent insider trade price on Form 4 (Oct 5, 2026), not a market close. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shannon Parisotto CEVP, Disc & Safety Assessment | 42K | −12K | 43K | +3.6% | ||||||||||||||||||||||||||||||||||||||||||||||||||||
Vesting, gifts, unvested awards and holding lines for Shannon Parisotto+6.7Kshares vested or exercised 0gifted (net of own trusts) −2.1Kwithheld by the company for taxes none reportedunvested awards, start → end
Stock options (not counted as shares):
Estimate: options held × ($308.44 − strike price), using the most recent insider trade price on Form 4 (Oct 5, 2026), not a market close. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Joseph LaPlumeiIncludes unvested RSUs, amount not disclosed. EVP, Corp Strategy & Develop | 24K | 0 | 31K | no sales | ||||||||||||||||||||||||||||||||||||||||||||||||||||
Vesting, gifts, unvested awards and holding lines for Joseph LaPlume0shares vested or exercised −257gifted (net of own trusts) −3.2Kwithheld by the company for taxes none reportedunvested awards, start → end
Stock options (not counted as shares):
Estimate: options held × ($308.44 − strike price), using the most recent insider trade price on Form 4 (Oct 5, 2026), not a market close. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Victoria Creamer EVP & Chief People Officer | 22K | −4.2K | 30K | +34% | ||||||||||||||||||||||||||||||||||||||||||||||||||||
Vesting, gifts, unvested awards and holding lines for Victoria Creamer+4.2Kshares vested or exercised 0gifted (net of own trusts) −2.5Kwithheld by the company for taxes none reportedunvested awards, start → end Stock options (not counted as shares):
Estimate: options held × ($308.44 − strike price), using the most recent insider trade price on Form 4 (Oct 5, 2026), not a market close. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Flavia Pease Corporate Executive VP & CFO | 17K | 0 | 17K | no sales | ||||||||||||||||||||||||||||||||||||||||||||||||||||
Vesting, gifts, unvested awards and holding lines for Flavia Pease0shares vested or exercised 0gifted (net of own trusts) none reportedunvested awards, start → end Stock options (not counted as shares):
Estimate: options held × ($308.44 − strike price), using the most recent insider trade price on Form 4 (Oct 5, 2026), not a market close. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Martin MackayiIncludes unvested RSUs, amount not disclosed. Director | 14K | 0 | 17K | no sales | ||||||||||||||||||||||||||||||||||||||||||||||||||||
Vesting, gifts, unvested awards and holding lines for Martin Mackay0shares vested or exercised 0gifted (net of own trusts) none reportedunvested awards, start → end
Stock options (not counted as shares):
Estimate: options held × ($308.44 − strike price), using the most recent insider trade price on Form 4 (Oct 5, 2026), not a market close. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Michael KnelliIncludes unvested RSUs, amount not disclosed. SVP, Finance and CAO | 11K | −6.6K | 12K | +13% | ||||||||||||||||||||||||||||||||||||||||||||||||||||
Vesting, gifts, unvested awards and holding lines for Michael Knell+2.3Kshares vested or exercised 0gifted (net of own trusts) −813withheld by the company for taxes none reportedunvested awards, start → end
Stock options (not counted as shares):
Estimate: options held × ($308.44 − strike price), using the most recent insider trade price on Form 4 (Oct 5, 2026), not a market close. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
George MassaroiIncludes unvested RSUs, amount not disclosed. Director | 5.6K | 0 | 5.6K | no sales | ||||||||||||||||||||||||||||||||||||||||||||||||||||
Vesting, gifts, unvested awards and holding lines for George Massaro0shares vested or exercised 0gifted (net of own trusts) none reportedunvested awards, start → end
Stock options (not counted as shares):
Estimate: options held × ($308.44 − strike price), using the most recent insider trade price on Form 4 (Oct 5, 2026), not a market close. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Virginia WilsoniIncludes unvested RSUs, amount not disclosed. Director | 4.9K | 0 | 6.3K | no sales | ||||||||||||||||||||||||||||||||||||||||||||||||||||
Vesting, gifts, unvested awards and holding lines for Virginia Wilson0shares vested or exercised 0gifted (net of own trusts) none reportedunvested awards, start → end
Stock options (not counted as shares):
Estimate: options held × ($308.44 − strike price), using the most recent insider trade price on Form 4 (Oct 5, 2026), not a market close. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
George Llado Sr.iIncludes unvested RSUs, amount not disclosed. Director | 4.8K | 0 | 6.7K | no sales | ||||||||||||||||||||||||||||||||||||||||||||||||||||
Vesting, gifts, unvested awards and holding lines for George Llado Sr.0shares vested or exercised 0gifted (net of own trusts) none reportedunvested awards, start → end
Stock options (not counted as shares):
Estimate: options held × ($308.44 − strike price), using the most recent insider trade price on Form 4 (Oct 5, 2026), not a market close. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Nancy AndrewsiIncludes unvested RSUs, amount not disclosed. Director | 4K | −573 | 5.4K | not meaningful | ||||||||||||||||||||||||||||||||||||||||||||||||||||
Vesting, gifts, unvested awards and holding lines for Nancy Andrews+573shares vested or exercised 0gifted (net of own trusts) none reportedunvested awards, start → end
Stock options (not counted as shares):
Estimate: options held × ($308.44 − strike price), using the most recent insider trade price on Form 4 (Oct 5, 2026), not a market close. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Reshema Kemps-PolancoiIncludes unvested RSUs, amount not disclosed. Director | 2.6K | 0 | 4.6K | no sales | ||||||||||||||||||||||||||||||||||||||||||||||||||||
Vesting, gifts, unvested awards and holding lines for Reshema Kemps-Polanco0shares vested or exercised 0gifted (net of own trusts) none reportedunvested awards, start → end
Stock options (not counted as shares):
Estimate: options held × ($308.44 − strike price), using the most recent insider trade price on Form 4 (Oct 5, 2026), not a market close. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Craig ThompsoniIncludes unvested RSUs, amount not disclosed. New Form 3 filed 2022-12-14; earlier filings set aside. Director | 2.4K | 0 | 3.9K | no sales | ||||||||||||||||||||||||||||||||||||||||||||||||||||
Vesting, gifts, unvested awards and holding lines for Craig Thompson0shares vested or exercised 0gifted (net of own trusts) none reportedunvested awards, start → end
Stock options (not counted as shares):
Estimate: options held × ($308.44 − strike price), using the most recent insider trade price on Form 4 (Oct 5, 2026), not a market close. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Mark MintziIncludes unvested RSUs, amount not disclosed. Unvested RSUs stated in footnotes are excluded from owned shares. EVP, Chief Information Officer | 2.1K | 0 | 9.5K | no sales | ||||||||||||||||||||||||||||||||||||||||||||||||||||
Vesting, gifts, unvested awards and holding lines for Mark Mintz0shares vested or exercised 0gifted (net of own trusts) −1.1Kwithheld by the company for taxes none reportedunvested awards, start → end
Stock options (not counted as shares):
Estimate: options held × ($308.44 − strike price), using the most recent insider trade price on Form 4 (Oct 5, 2026), not a market close. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Steven Barg Director | 1.4K | 0 | 3.3K | no sales | ||||||||||||||||||||||||||||||||||||||||||||||||||||
Vesting, gifts, unvested awards and holding lines for Steven Barg0shares vested or exercised 0gifted (net of own trusts) none reportedunvested awards, start → end Stock options (not counted as shares):
Estimate: options held × ($308.44 − strike price), using the most recent insider trade price on Form 4 (Oct 5, 2026), not a market close. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Paul Graves Director | 946 | 0 | 2.4K | no sales | ||||||||||||||||||||||||||||||||||||||||||||||||||||
Vesting, gifts, unvested awards and holding lines for Paul Graves0shares vested or exercised 0gifted (net of own trusts) none reportedunvested awards, start → end Stock options (not counted as shares):
Estimate: options held × ($308.44 − strike price), using the most recent insider trade price on Form 4 (Oct 5, 2026), not a market close. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Mark Enyedy Director | 946 | 0 | 2.4K | no sales | ||||||||||||||||||||||||||||||||||||||||||||||||||||
Vesting, gifts, unvested awards and holding lines for Mark Enyedy0shares vested or exercised 0gifted (net of own trusts) none reportedunvested awards, start → end Stock options (not counted as shares):
Estimate: options held × ($308.44 − strike price), using the most recent insider trade price on Form 4 (Oct 5, 2026), not a market close. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Abraham Ceesay Director | 946 | 0 | 2.4K | no sales | ||||||||||||||||||||||||||||||||||||||||||||||||||||
Vesting, gifts, unvested awards and holding lines for Abraham Ceesay0shares vested or exercised 0gifted (net of own trusts) none reportedunvested awards, start → end Stock options (not counted as shares):
Estimate: options held × ($308.44 − strike price), using the most recent insider trade price on Form 4 (Oct 5, 2026), not a market close. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Glenn ColemaniStarted reporting during the period; starting holdings are from the Form 3. EVP & Chief Financial Officer | 0 | 0 | 28K | no sales | ||||||||||||||||||||||||||||||||||||||||||||||||||||
Vesting, gifts, unvested awards and holding lines for Glenn Coleman | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
19 of 20 insiders fully reconciled: starting holdings plus reported transactions match ending holdings (19 exactly, 0 with a minor or footnoted difference). For 1 we show sales but not holdings; the ! icon on that row explains why. Percentages cover 17 of 20 officers and directors. Left out: James Foster (holdings couldn't be fully reconciled); Nancy Andrews (most of their shares vested during the period, so a percentage would mislead); Glenn Coleman (held no vested shares at the start). "Still held" compares ending with starting vested shares; a plus sign means the holding grew.
Officer and director open-market sales: $42.9M across 166,971 shares. Plan status and stated purpose are separate questions, and a sale can have both.
The lighter segment is sales with no plan disclosed in the filing ($3.0M), including tax-related sales outside a plan.
Sales with no 10b5-1 plan and no tax reference in the filing. $1.7M of it is Michael Knell. No plan disclosed is a statement about the filing, not about why the sale happened. Largest such sale: Victoria Creamer, Aug 6, 2026
31,138 shares ($6.3M) were withheld by the company for taxes, which isn't a market sale.
2 officers and directors bought shares in this period, in 2 trades(Form 4 code P). Across all their filings on record there are 11 purchase trades.
| Seller | Shares sold | Proceeds | Under a disclosed plan | Share of total | Sales dates |
|---|---|---|---|---|---|
| James Foster Director | 137K | $34.8M | 100% | 81% | Jun 29, 2026 to Aug 25, 2026 |
| Shannon Parisotto CEVP, Disc & Safety Assessment | 12K | $3.3M | 100% | 8% | Aug 5, 2026 to Oct 5, 2026 |
| Birgit Girshick Chief Executive Officer, Director | 6.5K | $1.8M | 100% | 4% | Aug 11, 2026 to Aug 11, 2026 |
| Michael Knell SVP, Finance and CAO | 6.6K | $1.7M | 0% | 4% | Aug 6, 2026 to Aug 6, 2026 |
| Victoria Creamer EVP & Chief People Officer | 4.2K | $1.1M | 0% | 3% | Aug 6, 2026 to Aug 6, 2026 |
| Nancy Andrews Director | 573 | $163K | 0% | 0.4% | Aug 18, 2026 to Aug 18, 2026 |
| Month | Sale proceeds | Disclosed plan | To cover taxes | No plan disclosed |
|---|---|---|---|---|
| Oct 2025 | $0 | $0 | $0 | $0 |
| Nov 2025 | $0 | $0 | $0 | $0 |
| Dec 2025 | $0 | $0 | $0 | $0 |
| Jan 2026 | $0 | $0 | $0 | $0 |
| Feb 2026 | $0 | $0 | $0 | $0 |
| Mar 2026 | $0 | $0 | $0 | $0 |
| Apr 2026 | $0 | $0 | $0 | $0 |
| May 2026 | $0 | $0 | $0 | $0 |
| Jun 2026 | $16.9M | $16.9M | $0 | $0 |
| Jul 2026 | $0 | $0 | $0 | $0 |
| Aug 2026 | $25.7M | $22.8M | $0 | $3.0M |
| Sep 2026 | $0 | $0 | $0 | $0 |
| Oct 2026 | $303K | $303K | $0 | $0 |
More than usual: about 1.8x the 5-year average. 6 insiders sold; the average is 7 a year.
| 12 months ending | Shares sold | Insiders who sold | Proceeds |
|---|---|---|---|
| Oct 8, 2026 Latest 12 months | 167K | 6 | $42.9M |
| Oct 8, 2025 1 year earlier | 14K | 3 | $2.7M |
| Oct 8, 2024 2 years earlier | 68K | 7 | $16.0M |
| Oct 9, 2023 3 years earlier | 51K | 7 | $12.0M |
| Oct 9, 2022 4 years earlier | 76K | 5 | $22.5M |
| Oct 9, 2021 5 years earlier | 255K | 11 | $78.3M |
Open-market sales (Form 4 code S) by people who were officers or directors, in split-adjusted shares. Earlier years include people who have since left. A sale that an outside holder also reports (a family trust, a fund) is counted with outside holders in every year. Shares, not dollars, are compared, so a change in the stock price doesn't look like a change in selling. Years the filings don't fully cover are shown but left out of the average.
James Foster: holdings couldn't be fully reconciled (difference of 3,068 shares). Balance changed with no matching transaction and no footnote: -14,577 shares on Jan 30, 2026 (2024 GRAT). Filing, Jan 30, 2026
External context: we only cite outside events when a documented connection exists. None is shown for this period.
All 1,660 Forms 3, 4 and 5 filed for Charles River Laboratories (SEC CIK 1100682) from Jun 23, 2000 to Oct 7, 2026, retrieved from SEC EDGAR on Oct 8, 2026. Prices are the ones reported in each filing, often weighted averages. 125 older filings exist only on paper and could not be read.
Holdings. Each holding line (a share class plus an owner, such as a trust or LLC) carries its last reported balance forward. Entities first reported during the period start at zero, so transfers between an insider's own trusts don't count as selling. Lines not reported for three years or more are listed separately and left out of totals.
Sales. A sale counts as under a 10b5-1 plan if its footnote cites one or the filing's Rule 10b5-1 box is checked, and as tax-related if its footnote cites tax obligations or sell-to-cover. Shares withheld by the company for taxes are listed separately. Sales with neither attribute are labeled "no plan disclosed".