Charles River Laboratories insider activity
What the executives and directors of Charles River Laboratories actually did with their own shares, decoded from their SEC Form 4 filings. Each figure says the stretch of time it covers.
−$43M
net open-market flow, 12 m
1 open-market buy, 12 m
93%
of sale value on 10b5-1 plans, 12 m
202 days since an insider bought, whole record
The tape: three years of insider trades
Open-market buy
Discretionary sale
Planned sale (10b5-1)
Reported-price path
Routine
Every marker sits at the price reported on the Form 4. The line is the monthly median of all prices insiders reported, so the chart needs no market feed; the grey strip is the routine flow (grants, vestings, tax withholding and gifts) that a headline gets wrong by counting it as selling.
The 120 routine events on the chart, as a list
| Date | Insider | Shares |
|---|---|---|
| Aug 25, 2026 | FOSTER JAMES C | 34K |
| Aug 19, 2026 | Girshick Birgit | 528 |
| Aug 19, 2026 | Parisotto Shannon M | 2,039 |
| Aug 18, 2026 | Andrews Nancy C | 573 |
| Aug 11, 2026 | Girshick Birgit | 6,500 |
| Aug 11, 2026 | Parisotto Shannon M | 3,714 |
| Aug 10, 2026 | FOSTER JAMES C | 29K |
| Aug 10, 2026 | LaPlume Joseph W | 257 |
| Aug 6, 2026 | Knell Michael Gunnar | 2,345 |
| Aug 6, 2026 | Creamer Victoria L | 4,179 |
| Jun 5, 2026 | FOSTER JAMES C | 367K |
| Jun 5, 2026 | Girshick Birgit | 6,772 |
| Jun 5, 2026 | Parisotto Shannon M | 3,058 |
| Jun 2, 2026 | Barg Steven | 422 |
| May 31, 2026 | Knell Michael Gunnar | 2,124 |
| May 31, 2026 | Creamer Victoria L | 6,291 |
| May 31, 2026 | Girshick Birgit | 12K |
| May 31, 2026 | LaPlume Joseph W | 6,664 |
| May 31, 2026 | Parisotto Shannon M | 5,355 |
| May 31, 2026 | Mintz Mark | 3,014 |
| May 30, 2026 | FOSTER JAMES C | 1,596 |
| May 29, 2026 | Coleman Glenn | 6,640 |
| May 12, 2026 | Andrews Nancy C | 7,928 |
| May 8, 2026 | FOSTER JAMES C | 1,860 |
| May 8, 2026 | WILSON VIRGINIA M | 1,438 |
| May 8, 2026 | MACKAY MARTIN | 2,845 |
| May 8, 2026 | Thompson Craig B. | 1,438 |
| May 8, 2026 | Graves Paul W | 1,438 |
| May 8, 2026 | Enyedy Mark J | 1,438 |
| May 8, 2026 | Ceesay Abraham | 1,438 |
| May 8, 2026 | Andrews Nancy C | 1,438 |
| May 8, 2026 | Llado George Sr. | 1,888 |
| May 8, 2026 | Barg Steven | 1,438 |
| May 8, 2026 | Kemps-Polanco Reshema | 1,973 |
| May 1, 2026 | Coleman Glenn | 21K |
| Mar 4, 2026 | Girshick Birgit | 328 |
| Mar 2, 2026 | FOSTER JAMES C | 17K |
| Feb 6, 2026 | Parisotto Shannon M | 14K |
| Jan 30, 2026 | FOSTER JAMES C | 54K |
| Jan 30, 2026 | Knell Michael Gunnar | 2,194 |
| Jan 30, 2026 | Creamer Victoria L | 6,302 |
| Jan 30, 2026 | Girshick Birgit | 13K |
| Jan 30, 2026 | LaPlume Joseph W | 7,205 |
| Jan 30, 2026 | Parisotto Shannon M | 5,303 |
| Jan 30, 2026 | Mintz Mark | 2,452 |
| Nov 6, 2025 | Knell Michael Gunnar | 2,926 |
| Jun 5, 2025 | LaPlume Joseph W | 385 |
| Jun 2, 2025 | Graves Paul W | 946 |
| Jun 2, 2025 | Enyedy Mark J | 946 |
| Jun 2, 2025 | Ceesay Abraham | 946 |
| Jun 2, 2025 | Barg Steven | 1,427 |
| Jun 1, 2025 | Knell Michael Gunnar | 2,449 |
| May 31, 2025 | Creamer Victoria L | 6,648 |
| May 31, 2025 | Girshick Birgit | 13K |
| May 31, 2025 | LaPlume Joseph W | 7,230 |
| May 31, 2025 | Pease Flavia | 7,668 |
| May 31, 2025 | Parisotto Shannon M | 5,921 |
| May 30, 2025 | FOSTER JAMES C | 17K |
| May 21, 2025 | WILSON VIRGINIA M | 946 |
| May 21, 2025 | MACKAY MARTIN | 1,761 |
Where the shares went, last 12 months
Every Form 4 movement decomposed: what flowed in (grants, vested equity, purchases) and what flowed out (tax withholding, plan sales, discretionary sales, gifts). Counted in shares, because grants carry no price.
The chart, in numbers
| Flow | Shares |
|---|---|
| From holdings | 154K |
| Granted | 162K |
| Vested / exercised | 82K |
| Bought on market | 25 |
| Withheld for tax | 31K |
| Planned sales (10b5-1) | 155K |
| Discretionary sales | 11K |
| Gifts | 201K |
Skin in the game
Directly held shares as reported after each trade, indexed to 100 at the start of the window, up to five years back. Direct holdings only: trust and family-entity positions are per-entity in the filings and do not sum honestly, so this chart refuses to guess. The steps are the trades.
The chart, in numbers
| Insider | Start of the window | Latest reported | Indexed, start = 100 |
|---|---|---|---|
| FOSTER JAMES C | 238K | 32K | 13.3 |
| Girshick Birgit | 30K | 35K | 118.5 |
| Creamer Victoria L | 10K | 30K | 292 |
| Coleman Glenn | 21K | 28K | 131.5 |
Who holds what
the 14 largest holdings of 24| Insider | Role | Shares held | Buys 12 m | Sales 12 m | 12 m | Last trade |
|---|---|---|---|---|---|---|
| FOSTER JAMES C Last trade Aug 25, 2026 | Director | 208K | – | $35M | net selling over the year: 0 months buying, 2 months selling | Aug 25, 2026 |
| Girshick Birgit Chief Executive Officer Last trade Aug 11, 2026 | CEO | 79K | – | $1.8M | net selling over the year: 0 months buying, 1 month selling | Aug 11, 2026 |
| Creamer Victoria L EVP & Chief People Officer Last trade Aug 6, 2026 | Officer | 34K | – | $1.1M | net selling over the year: 0 months buying, 1 month selling | Aug 6, 2026 |
| BERTOLINI ROBERT J Last trade May 20, 2020 | Director | 32K | – | – | May 20, 2020 | |
| LaPlume Joseph W EVP, Corp Strategy & Develop Last trade Mar 3, 2026 | Officer | 31K | $4K | – | net buying over the year: 1 month buying, 0 months selling | Mar 3, 2026 |
| Coleman Glenn EVP & Chief Financial Officer | CFO | 28K | – | – | – | |
| Barbo William D Corporate Executive VP & CCO Last trade Feb 22, 2024 | Officer | 27K | – | – | Feb 22, 2024 | |
| Pease Flavia Corporate Executive VP & CFO | CFO | 17K | – | – | – | |
| Parisotto Shannon M CEVP, Disc & Safety Assessment Last trade Aug 19, 2026 | Officer | 17K | – | $3.0M | net selling over the year: 0 months buying, 1 month selling | Aug 19, 2026 |
| MACKAY MARTIN | Director | 16K | – | – | – | |
| WALLMAN RICHARD F Last trade Nov 7, 2024 | Director | 16K | – | – | Nov 7, 2024 | |
| Knell Michael Gunnar SVP, Finance and CAO Last trade Aug 6, 2026 | Officer | 15K | – | $1.7M | net selling over the year: 0 months buying, 1 month selling | Aug 6, 2026 |
| Mintz Mark EVP, Chief Information Officer | Officer | 9,546 | – | – | – | |
| Kochevar Deborah Turner Last trade Aug 6, 2021 | Director | 7,894 | – | – | Aug 6, 2021 |
Open-market trade log
the 60 most recent of 7,148| Date | Insider | Type | Shares | Price | Value | Since trade | Filed |
|---|---|---|---|---|---|---|---|
| Aug 25, 2026 | FOSTER JAMES C (Director) 34K shares $300.00 −12.3% since trade filed Aug 27, 2026 | Planned sale (10b5-1) | 34K | $300.00 | $10M | −12.3% | Aug 27, 2026 |
| Aug 19, 2026 | Parisotto Shannon M (Officer) 2,039 shares $294.12 −10.6% since trade filed Aug 20, 2026 | Planned sale (10b5-1) | 2,039 | $294.12 | $600K | −10.6% | Aug 20, 2026 |
| Aug 18, 2026 | Andrews Nancy C (Director) 573 shares $285.24 −7.8% since trade filed Aug 20, 2026 | Discretionary sale | 573 | $285.24 | $163K | −7.8% | Aug 20, 2026 |
| Aug 11, 2026 | Girshick Birgit (CEO) 6,500 shares $279.90 −6.0% since trade filed Aug 13, 2026 | Planned sale (10b5-1) | 6,500 | $279.90 | $1.8M | −6.0% | Aug 13, 2026 |
| Aug 11, 2026 | Parisotto Shannon M (Officer) 3,714 shares $279.66 −6.0% since trade filed Aug 13, 2026 | Planned sale (10b5-1) | 3,714 | $279.66 | $1.0M | −6.0% | Aug 13, 2026 |
| Aug 10, 2026 | FOSTER JAMES C (Director) 29K shares $275.00 −4.4% since trade filed Aug 11, 2026 | Planned sale (10b5-1) | 29K | $275.00 | $7.9M | −4.4% | Aug 11, 2026 |
| Aug 6, 2026 | Knell Michael Gunnar (Officer) 213 shares $262.37 +0.2% since trade filed Aug 10, 2026 | Discretionary sale | 213 | $262.37 | $56K | +0.2% | Aug 10, 2026 |
| Aug 6, 2026 | Knell Michael Gunnar (Officer) 404 shares $258.53 +1.7% since trade filed Aug 10, 2026 | Discretionary sale | 404 | $258.53 | $104K | +1.7% | Aug 10, 2026 |
| Aug 6, 2026 | Knell Michael Gunnar (Officer) 482 shares $265.17 −0.8% since trade filed Aug 10, 2026 | Discretionary sale | 482 | $265.17 | $128K | −0.8% | Aug 10, 2026 |
| Aug 6, 2026 | Knell Michael Gunnar (Officer) 620 shares $263.94 −0.4% since trade filed Aug 10, 2026 | Discretionary sale | 620 | $263.94 | $164K | −0.4% | Aug 10, 2026 |
| Aug 6, 2026 | Knell Michael Gunnar (Officer) 736 shares $258.53 +1.7% since trade filed Aug 10, 2026 | Discretionary sale | 736 | $258.53 | $190K | +1.7% | Aug 10, 2026 |
| Aug 6, 2026 | Knell Michael Gunnar (Officer) 810 shares $261.45 +0.6% since trade filed Aug 10, 2026 | Discretionary sale | 810 | $261.45 | $212K | +0.6% | Aug 10, 2026 |
| Aug 6, 2026 | Knell Michael Gunnar (Officer) 901 shares $260.63 +0.9% since trade filed Aug 10, 2026 | Discretionary sale | 901 | $260.63 | $235K | +0.9% | Aug 10, 2026 |
| Aug 6, 2026 | Knell Michael Gunnar (Officer) 1,205 shares $258.53 +1.7% since trade filed Aug 10, 2026 | Discretionary sale | 1,205 | $258.53 | $312K | +1.7% | Aug 10, 2026 |
| Aug 6, 2026 | Knell Michael Gunnar (Officer) 1,274 shares $259.07 +1.5% since trade filed Aug 10, 2026 | Discretionary sale | 1,274 | $259.07 | $330K | +1.5% | Aug 10, 2026 |
| Aug 6, 2026 | Creamer Victoria L (Officer) 4,179 shares $259.16 +1.5% since trade filed Aug 10, 2026 | Discretionary sale | 4,179 | $259.16 | $1.1M | +1.5% | Aug 10, 2026 |
| Aug 5, 2026 | Parisotto Shannon M (Officer) 5,046 shares $263.00 +0.0% since trade filed Aug 6, 2026 | Planned sale (10b5-1) | 5,046 | $263.00 | $1.3M | +0.0% | Aug 6, 2026 |
| Jun 29, 2026 | FOSTER JAMES C (Director) 75K shares $225.00 +16.9% since trade filed Jul 1, 2026 | Planned sale (10b5-1) | 75K | $225.00 | $17M | +16.9% | Jul 1, 2026 |
| Mar 3, 2026 | LaPlume Joseph W (Officer) 25 shares $174.54 +50.7% since trade filed Mar 4, 2026 | Open-market buy | 25 | $174.54 | $4K | +50.7% | Mar 4, 2026 |
| Aug 22, 2025 | LaPlume Joseph W (Officer) 400 shares $163.72 +60.6% since trade filed Jan 20, 2026 late | Discretionary sale | 400 | $163.72 | $65K | +60.6% | Jan 20, 2026 late |
| Aug 18, 2025 | LaPlume Joseph W (Officer) 800 shares $157.60 +66.9% since trade filed Aug 20, 2025 | Discretionary sale | 800 | $157.60 | $126K | +66.9% | Aug 20, 2025 |
| Aug 7, 2025 | LaPlume Joseph W (Officer) 400 shares $150.04 +75.3% since trade filed Aug 8, 2025 | Discretionary sale | 400 | $150.04 | $60K | +75.3% | Aug 8, 2025 |
| May 15, 2025 | MASSARO GEORGE (Director) 24 shares $139.05 +89.1% since trade filed May 16, 2025 | Planned sale (10b5-1) | 24 | $139.05 | $3K | +89.1% | May 16, 2025 |
| May 15, 2025 | MASSARO GEORGE (Director) 35 shares $136.32 +92.9% since trade filed May 16, 2025 | Planned sale (10b5-1) | 35 | $136.32 | $5K | +92.9% | May 16, 2025 |
| May 15, 2025 | MASSARO GEORGE (Director) 81 shares $137.68 +91.0% since trade filed May 16, 2025 | Planned sale (10b5-1) | 81 | $137.68 | $11K | +91.0% | May 16, 2025 |
| May 14, 2025 | MASSARO GEORGE (Director) 7 shares $143.77 +82.9% since trade filed May 15, 2025 | Planned sale (10b5-1) | 7 | $143.77 | $1K | +82.9% | May 15, 2025 |
| May 14, 2025 | MASSARO GEORGE (Director) 7 shares $145.54 +80.7% since trade filed May 15, 2025 | Planned sale (10b5-1) | 7 | $145.54 | $1K | +80.7% | May 15, 2025 |
| May 14, 2025 | MASSARO GEORGE (Director) 14 shares $141.85 +85.4% since trade filed May 15, 2025 | Planned sale (10b5-1) | 14 | $141.85 | $2K | +85.4% | May 15, 2025 |
| May 14, 2025 | MASSARO GEORGE (Director) 21 shares $140.78 +86.8% since trade filed May 15, 2025 | Planned sale (10b5-1) | 21 | $140.78 | $3K | +86.8% | May 15, 2025 |
| May 14, 2025 | MASSARO GEORGE (Director) 91 shares $139.95 +87.9% since trade filed May 15, 2025 | Planned sale (10b5-1) | 91 | $139.95 | $13K | +87.9% | May 15, 2025 |
| May 13, 2025 | LaPlume Joseph W (Officer) 500 shares $145.41 +80.9% since trade filed May 15, 2025 | Discretionary sale | 500 | $145.41 | $73K | +80.9% | May 15, 2025 |
| Feb 20, 2025 | FOSTER JAMES C (CEO) 6,075 shares $165.01 +59.4% since trade filed Feb 21, 2025 | Open-market buy | 6,075 | $165.01 | $1.0M | +59.4% | Feb 21, 2025 |
| Feb 20, 2025 | Girshick Birgit (COO) 1,514 shares $164.63 +59.8% since trade filed Feb 21, 2025 | Open-market buy | 1,514 | $164.63 | $249K | +59.8% | Feb 21, 2025 |
| Feb 20, 2025 | LaPlume Joseph W (Officer) 4,400 shares $162.50 +61.9% since trade filed Feb 21, 2025 | Discretionary sale | 4,400 | $162.50 | $715K | +61.9% | Feb 21, 2025 |
| Nov 7, 2024 | WALLMAN RICHARD F (Director) 1,000 shares $216.50 +21.5% since trade filed Nov 12, 2024 | Discretionary sale | 1,000 | $216.50 | $217K | +21.5% | Nov 12, 2024 |
| Nov 7, 2024 | WALLMAN RICHARD F (Director) 3,250 shares $216.50 +21.5% since trade filed Nov 12, 2024 | Discretionary sale | 3,250 | $216.50 | $704K | +21.5% | Nov 12, 2024 |
| Nov 7, 2024 | WALLMAN RICHARD F (Director) 3,371 shares $215.75 +21.9% since trade filed Nov 12, 2024 | Discretionary sale | 3,371 | $215.75 | $727K | +21.9% | Nov 12, 2024 |
| Aug 8, 2024 | LaPlume Joseph W (Officer) 1,780 shares $199.36 +31.9% since trade filed Aug 12, 2024 | Discretionary sale | 1,780 | $199.36 | $355K | +31.9% | Aug 12, 2024 |
| Aug 1, 2024 | FOSTER JAMES C (CEO) 25K shares $250.00 +5.2% since trade filed Aug 5, 2024 | Planned sale (10b5-1) | 25K | $250.00 | $6.3M | +5.2% | Aug 5, 2024 |
| May 15, 2024 | MASSARO GEORGE (Director) 96 shares $236.78 +11.1% since trade filed May 16, 2024 | Planned sale (10b5-1) | 96 | $236.78 | $23K | +11.1% | May 16, 2024 |
| May 15, 2024 | MASSARO GEORGE (Director) 113 shares $235.61 +11.6% since trade filed May 16, 2024 | Planned sale (10b5-1) | 113 | $235.61 | $27K | +11.6% | May 16, 2024 |
| May 15, 2024 | MASSARO GEORGE (Director) 123 shares $234.72 +12.1% since trade filed May 16, 2024 | Planned sale (10b5-1) | 123 | $234.72 | $29K | +12.1% | May 16, 2024 |
| May 10, 2024 | LaPlume Joseph W (Officer) 1,304 shares $226.97 +15.9% since trade filed May 14, 2024 | Discretionary sale | 1,304 | $226.97 | $296K | +15.9% | May 14, 2024 |
| Mar 8, 2024 | Knell Michael Gunnar (Officer) 808 shares $267.52 −1.7% since trade filed May 29, 2024 late | Discretionary sale | 808 | $267.52 | $216K | −1.7% | May 29, 2024 late |
| Mar 4, 2024 | Knell Michael Gunnar (Officer) 1,000 shares $261.35 +0.6% since trade filed Mar 5, 2024 | Discretionary sale | 1,000 | $261.35 | $261K | +0.6% | Mar 5, 2024 |
| Mar 4, 2024 | Knell Michael Gunnar (Officer) 1,750 shares $260.88 +0.8% since trade filed Mar 5, 2024 | Discretionary sale | 1,750 | $260.88 | $457K | +0.8% | Mar 5, 2024 |
| Feb 29, 2024 | Creamer Victoria L (Officer) 5,000 shares $253.70 +3.7% since trade filed Mar 1, 2024 | Discretionary sale | 5,000 | $253.70 | $1.3M | +3.7% | Mar 1, 2024 |
| Feb 29, 2024 | Parisotto Shannon M (Officer) 100 shares $254.02 +3.5% since trade filed Mar 4, 2024 | Discretionary sale | 100 | $254.02 | $25K | +3.5% | Mar 4, 2024 |
| Feb 29, 2024 | Parisotto Shannon M (Officer) 3,686 shares $253.43 +3.8% since trade filed Mar 4, 2024 | Discretionary sale | 3,686 | $253.43 | $934K | +3.8% | Mar 4, 2024 |
| Feb 22, 2024 | Barbo William D (Officer) 4,050 shares $248.50 +5.8% since trade filed Feb 23, 2024 | Discretionary sale | 4,050 | $248.50 | $1.0M | +5.8% | Feb 23, 2024 |
| Feb 15, 2024 | LaPlume Joseph W (Officer) 838 shares $238.93 +10.1% since trade filed Feb 20, 2024 | Discretionary sale | 838 | $238.93 | $200K | +10.1% | Feb 20, 2024 |
| Feb 15, 2024 | Parisotto Shannon M (Officer) 89 shares $245.34 +7.2% since trade filed Feb 20, 2024 | Planned sale (10b5-1) | 89 | $245.34 | $22K | +7.2% | Feb 20, 2024 |
| Feb 15, 2024 | Parisotto Shannon M (Officer) 291 shares $237.20 +10.9% since trade filed Feb 20, 2024 | Planned sale (10b5-1) | 291 | $237.20 | $69K | +10.9% | Feb 20, 2024 |
| Feb 15, 2024 | Parisotto Shannon M (Officer) 604 shares $243.96 +7.8% since trade filed Feb 20, 2024 | Planned sale (10b5-1) | 604 | $243.96 | $147K | +7.8% | Feb 20, 2024 |
| Feb 15, 2024 | Parisotto Shannon M (Officer) 610 shares $241.28 +9.0% since trade filed Feb 20, 2024 | Planned sale (10b5-1) | 610 | $241.28 | $147K | +9.0% | Feb 20, 2024 |
| Feb 15, 2024 | Parisotto Shannon M (Officer) 632 shares $242.43 +8.5% since trade filed Feb 20, 2024 | Planned sale (10b5-1) | 632 | $242.43 | $153K | +8.5% | Feb 20, 2024 |
| Feb 15, 2024 | Parisotto Shannon M (Officer) 749 shares $244.61 +7.5% since trade filed Feb 20, 2024 | Planned sale (10b5-1) | 749 | $244.61 | $183K | +7.5% | Feb 20, 2024 |
| Feb 15, 2024 | Parisotto Shannon M (Officer) 1,290 shares $239.28 +9.9% since trade filed Feb 20, 2024 | Planned sale (10b5-1) | 1,290 | $239.28 | $309K | +9.9% | Feb 20, 2024 |
| Feb 15, 2024 | Parisotto Shannon M (Officer) 1,617 shares $240.12 +9.5% since trade filed Feb 20, 2024 | Planned sale (10b5-1) | 1,617 | $240.12 | $388K | +9.5% | Feb 20, 2024 |
| Dec 14, 2023 | Creamer Victoria L (Officer) 5,526 shares $225.00 +16.9% since trade filed Dec 18, 2023 | Planned sale (10b5-1) | 5,526 | $225.00 | $1.2M | +16.9% | Dec 18, 2023 |
“Since trade” compares with the latest insider-implied price, not a market quote: these pages are built from filings alone. A role here is the one on that day's Form 4, so somebody promoted since appears under both titles.
Filing hygiene
180 Forms 4, 3 years
4 filed late
12 amendments
7.2 avg. days to file
How to read this
A Form 4 transaction code decides everything. P is an open-market purchase and S an open-market sale; those two are the only codes where an insider chose to trade. A is a grant, M an option exercise or vesting, F shares withheld to cover tax, G a gift. Most “insiders dumped billions” headlines are code F and M mechanics.
Sales flagged 10b5-1 run on a plan the insider adopted in advance; since 2023 every Form 4 carries that flag. Buys have historically predicted returns, sales mostly have not, and this page states filings, not advice.