MKS Incorporated (MKSI)

MKS Incorporated experienced significant insider selling activity totaling over 6.4 million dollars recently. Executives, including the CEO and COO, executed multiple planned divestments amid a 34.8% decline in share value over ninety days. These transactions occurred following the August earnings report, which showed a 12.2% profit beat, despite the broader downward stock trend.
Ticker: MKSI Exchange: NSM


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• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Buy signal Sell signal Earnings
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Insider trades have triggered activity signals for MKS Incorporated. Upgrade to see score, net flow, insiders and the full signal context.

Top insiders
Trades
Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other
0.5
Mora Elizabeth Non-Executive Director
Transaction date
Planned sale
Price
302.25
Quantity 64,649 -23.3%
Value US$1,865,517
0.5
Mora Elizabeth Director Non-Executive Director
Transaction date
Proposed sale
Price
393.06
Quantity 27,605
Value US$3,448,980
1.4
Lee John Tseng-Chung President & CEO Executive Director
Transaction date
Planned sale
Price
391.21
Quantity 59,608 -49.7%
Value US$3,843,299
1.4
Lee John Tseng-Chung Officer; Director Executive Director
Transaction date
Proposed sale
Price
302.01
Quantity 10,000
Value US$3,020,100
2.3
Williams John Edward EVP & GM, PSD Officer
Transaction date
Planned sale
Price
288.31
Quantity 457 -10.0%
Value US$131,758
2.3
Williams John Edward Officer Officer
Transaction date
Proposed sale
Price
288.31
Quantity 457
Value US$131,758
2.3
Schreiner James Alan EVP & COO Officer
Transaction date
Sale
Price
347.00
Quantity 217 -1.1%
Value US$75,299
2.3
Schreiner James Alan EVP & COO Officer
Transaction date
Sale
Price
346.41
Quantity 812 -4.0%
Value US$281,282
2.3
Schreiner James Alan EVP & COO Officer
Transaction date
Sale
Price
345.52
Quantity 2,471 -10.9%
Value US$853,790
2.3
Schreiner James Alan Officer Officer
Transaction date
Proposed sale
Price
345.82
Quantity 3,500
Value US$1,210,370
2.3
Schreiner James Alan EVP & COO Officer
Transaction date
Planned sale
Price
317.42
Quantity 781 -3.3%
Value US$247,905
2.3
Schreiner James Alan Officer Officer
Transaction date
Proposed sale
Price
317.42
Quantity 781
Value US$247,905
3.0
McCarthy Michelle M SVP & Chief Accounting Officer Officer
Transaction date
Planned sale
Price
315.23
Quantity 2,434 -99.9%
Value US$767,270
3.0
McCarthy Michelle M Officer Officer
Transaction date
Proposed sale
Price
315.23
Quantity 2,434
Value US$767,270
3.3
Henry David Philip EVP, Global Str Mktg & GM, MSD Officer
Transaction date
Sale
Price
314.43
Quantity 6,000 -36.5%
Value US$1,886,583
0.5
Mora Elizabeth Non-Executive Director
Transaction date
Planned sale
Price
318.02
Quantity 300 -1.5%
Value US$95,406
3.3
Henry David Philip Officer Officer
Transaction date
Proposed sale
Price
314.43
Quantity 6,000
Value US$1,886,583
0.5
Mora Elizabeth Director Non-Executive Director
Transaction date
Proposed sale
Price
318.02
Quantity 300
Value US$95,406
2.2
Donahue Joseph B Non-Executive Director
Transaction date
Sale
Price
327.95
Quantity 2,100 -17.3%
Value US$688,703
1.8
COLELLA GERALD G Non-Executive Director
Transaction date
Planned sale
Price
338.58
Quantity 2,800 -12.3%
Value US$948,024
1.8
COLELLA GERALD G Non-Executive Director
Transaction date
Planned sale
Price
337.05
Quantity 213 -0.9%
Value US$71,792
1.8
COLELLA GERALD G Non-Executive Director
Transaction date
Planned sale
Price
336.54
Quantity 1,626 -6.6%
Value US$547,219
1.8
COLELLA GERALD G Non-Executive Director
Transaction date
Planned sale
Price
335.46
Quantity 1,811 -6.8%
Value US$607,514
1.8
COLELLA GERALD G Non-Executive Director
Transaction date
Planned sale
Price
332.04
Quantity 4,876 -15.6%
Value US$1,619,034
1.8
COLELLA GERALD G Non-Executive Director
Transaction date
Planned sale
Price
331.45
Quantity 8,210 -20.8%
Value US$2,721,195
1.8
COLELLA GERALD G Non-Executive Director
Transaction date
Planned sale
Price
330.38
Quantity 464 -1.2%
Value US$153,298
2.2
Donahue Joseph B Director Non-Executive Director
Transaction date
Proposed sale
Price
327.95
Quantity 2,100
Value US$688,704
3.3
Henry David Philip EVP, Global Str Mktg & GM, MSD Officer
Transaction date
Planned sale
Price
330.50
Quantity 2,500 -13.3%
Value US$826,250
3.3
Henry David Philip Officer Officer
Transaction date
Proposed sale
Price
330.50
Quantity 2,500
Value US$826,250
2.2
Mayampurath Ramakumar EVP & CFO Officer
Transaction date
Planned sale
Price
315.48
Quantity 8,810 -100.0%
Value US$2,779,379
1.4
Lee John Tseng-Chung President & CEO Executive Director
Transaction date
Planned sale
Price
315.48
Quantity 10,000 -6.5%
Value US$3,154,800
1.4
Lee John Tseng-Chung Officer; Director Executive Director
Transaction date
Proposed sale
Price
315.48
Quantity 10,000
Value US$3,154,800
2.2
Mayampurath Ramakumar Officer Officer
Transaction date
Proposed sale
Price
315.48
Quantity 8,810
Value US$2,779,379
2.4
CANNONE PETER III Non-Executive Director
Transaction date
Sale
Price
303.40
Quantity 1,350 -14.8%
Value US$409,590
2.4
CANNONE PETER III Director Non-Executive Director
Transaction date
Proposed sale
Price
303.40
Quantity 1,350
Value US$409,590
2.7
Moloney Jacqueline F Non-Executive Director
Transaction date
Sale
Price
312.20
Quantity 1,000 -10.2%
Value US$312,197
2.7
Moloney Jacqueline F Director Non-Executive Director
Transaction date
Proposed sale
Price
312.20
Quantity 1,000
Value US$312,197
2.7
Moloney Jacqueline F Non-Executive Director
Transaction date
Sale
Price
318.99
Quantity 1,400 -12.5%
Value US$446,586
2.7
Moloney Jacqueline F Director Non-Executive Director
Transaction date
Proposed sale
Price
318.99
Quantity 1,400
Value US$446,586
2.2
Taranto Eric Robert EVP & GM, VSD Officer
Transaction date
Sale
Price
319.93
Quantity 2,849 -18.4%
Value US$911,328
3.1
Burke Kathleen Flaherty EVP, GC & Secretary Officer
Transaction date
Sale
Price
319.94
Quantity 4,355 -8.1%
Value US$1,393,317
2.2
Taranto Eric Robert Officer Officer
Transaction date
Proposed sale
Price
319.88
Quantity 2,849
Value US$911,328
3.1
Burke Kathleen Flaherty Officer Officer
Transaction date
Proposed sale
Price
319.94
Quantity 4,355
Value US$1,393,317
2.7
Moloney Jacqueline F Non-Executive Director
Transaction date
Sale
Price
213.77
Quantity 340 -3.2%
Value US$72,705
2.7
Moloney Jacqueline F Director Non-Executive Director
Transaction date
Proposed sale
Price
213.21
Quantity 341
Value US$72,705
2.2
Taranto Eric Robert EVP & GM, VSD Officer
Transaction date
Sale
Price
220.52
Quantity 4,568 -22.8%
Value US$1,007,318
2.2
Taranto Eric Robert Officer Officer
Transaction date
Proposed sale
Price
220.52
Quantity 4,568
Value US$1,007,318
0.5
Mora Elizabeth Non-Executive Director
Transaction date
Planned sale
Price
239.44
Quantity 300 -1.6%
Value US$71,832
0.5
Mora Elizabeth Director Non-Executive Director
Transaction date
Proposed sale
Price
239.44
Quantity 300
Value US$71,832
2.3
Schreiner James Alan EVP & COO Officer
Transaction date
Sale
Price
255.00
Quantity 4,100 -14.9%
Value US$1,045,500
1.8
COLELLA GERALD G Non-Executive Director
Transaction date
Sale
Price
253.97
Quantity 10,000 -20.0%
Value US$2,539,675
2.3
Schreiner James Alan Officer Officer
Transaction date
Proposed sale
Price
255.00
Quantity 4,100
Value US$1,045,500
1.8
COLELLA GERALD G Non-Executive Director
Transaction date
Sale
Price
252.90
Quantity 10,000 -16.7%
Value US$2,528,999
2.4
CANNONE PETER III Non-Executive Director
Transaction date
Sale
Price
258.06
Quantity 1,250 -13.0%
Value US$322,574
2.2
Taranto Eric Robert EVP & GM, VSD Officer
Transaction date
Sale
Price
247.55
Quantity 1,453 -6.8%
Value US$359,623
3.3
Henry David Philip EVP, Global Str Mktg & GM, MSD Officer
Transaction date
Sale
Price
261.56
Quantity 2,000 -9.6%
Value US$523,120
3.0
McCarthy Michelle M VP & Chief Accounting Officer Officer
Transaction date
Sale
Price
250.35
Quantity 816 -100.0%
Value US$204,284
3.0
McCarthy Michelle M VP & Chief Accounting Officer Officer
Transaction date
Sale
Price
249.57
Quantity 650 -44.3%
Value US$162,219
2.7
Moloney Jacqueline F Non-Executive Director
Transaction date
Sale
Price
247.55
Quantity 829 -7.2%
Value US$205,219
2.3
Williams John Edward EVP & GM, PSD Officer
Transaction date
Sale
Price
256.41
Quantity 2,043 -35.9%
Value US$523,744
3.1
Burke Kathleen Flaherty EVP, GC & Secretary Officer
Transaction date
Sale
Price
250.00
Quantity 4,254 -7.3%
Value US$1,063,500
1.4
Lee John Tseng-Chung President & CEO Executive Director
Transaction date
Sale
Price
259.70
Quantity 1,890 -1.2%
Value US$490,839
1.4
Lee John Tseng-Chung President & CEO Executive Director
Transaction date
Sale
Price
257.81
Quantity 1,988 -1.3%
Value US$512,523
1.4
Lee John Tseng-Chung President & CEO Executive Director
Transaction date
Sale
Price
256.93
Quantity 12,812 -7.5%
Value US$3,291,804
1.4
Lee John Tseng-Chung President & CEO Executive Director
Transaction date
Sale
Price
256.05
Quantity 13,310 -7.2%
Value US$3,408,076
3.3
Henry David Philip Officer Officer
Transaction date
Proposed sale
Price
261.56
Quantity 2,000
Value US$523,120
2.4
CANNONE PETER III Director Non-Executive Director
Transaction date
Proposed sale
Price
258.06
Quantity 1,250
Value US$322,574
1.4
Lee John Tseng-Chung Officer; Director Executive Director
Transaction date
Proposed sale
Price
247.55
Quantity 30,000
Value US$7,426,500
2.3
Williams John Edward Officer Officer
Transaction date
Proposed sale
Price
256.36
Quantity 2,043
Value US$523,744
2.2
Taranto Eric Robert Officer Officer
Transaction date
Proposed sale
Price
247.50
Quantity 1,453
Value US$359,623
3.0
McCarthy Michelle M Officer Officer
Transaction date
Proposed sale
Price
250.00
Quantity 1,466
Value US$366,503
3.1
Burke Kathleen Flaherty Officer Officer
Transaction date
Proposed sale
Price
250.00
Quantity 4,254
Value US$1,063,500
2.7
Moloney Jacqueline F Director Non-Executive Director
Transaction date
Proposed sale
Price
247.55
Quantity 829
Value US$205,219
Notification date Transaction date B/S Transaction type Insider and/or position Nb. shares
Price
Value
Number of shares Price Value Details
2026-09-02 2026-09-01 PlS Planned sale Non-Executive Director
64,649 -23.3%
302.25
US$1,865,517
64,649 -23.3% 302.25 US$1,865,517
2026-09-01 2026-09-01 PrS Proposed sale

Director

Non-Executive Director
27,605
393.06
US$3,448,980
27,605 393.06 US$3,448,980
2026-08-17 2026-08-14 PlS Planned sale

President & CEO

Executive Director
59,608 -49.7%
391.21
US$3,843,299
59,608 -49.7% 391.21 US$3,843,299
2026-08-14 2026-08-14 PrS Proposed sale

Officer; Director

Executive Director
10,000
302.01
US$3,020,100
10,000 302.01 US$3,020,100
2026-08-04 2026-08-03 PlS Planned sale

EVP & GM, PSD

Officer
457 -10.0%
288.31
US$131,758
457 -10.0% 288.31 US$131,758
2026-08-03 2026-08-03 PrS Proposed sale

Officer

Officer
457
288.31
US$131,758
457 288.31 US$131,758
2026-06-16 2026-06-12 S Sale

EVP & COO

Officer
217 -1.1%
347.00
US$75,299
217 -1.1% 347.00 US$75,299
2026-06-16 2026-06-12 S Sale

EVP & COO

Officer
812 -4.0%
346.41
US$281,282
812 -4.0% 346.41 US$281,282
2026-06-16 2026-06-12 S Sale

EVP & COO

Officer
2,471 -10.9%
345.52
US$853,790
2,471 -10.9% 345.52 US$853,790
2026-06-12 2026-06-12 PrS Proposed sale

Officer

Officer
3,500
345.82
US$1,210,370
3,500 345.82 US$1,210,370
2026-06-11 2026-06-10 PlS Planned sale

EVP & COO

Officer
781 -3.3%
317.42
US$247,905
781 -3.3% 317.42 US$247,905
2026-06-10 2026-06-10 PrS Proposed sale

Officer

Officer
781
317.42
US$247,905
781 317.42 US$247,905
2026-06-08 2026-06-05 PlS Planned sale

SVP & Chief Accounting Officer

Officer
2,434 -99.9%
315.23
US$767,270
2,434 -99.9% 315.23 US$767,270
2026-06-05 2026-06-05 PrS Proposed sale

Officer

Officer
2,434
315.23
US$767,270
2,434 315.23 US$767,270
2026-06-02 2026-06-01 S Sale

EVP, Global Str Mktg & GM, MSD

Officer
6,000 -36.5%
314.43
US$1,886,583
6,000 -36.5% 314.43 US$1,886,583
2026-06-02 2026-06-01 PlS Planned sale Non-Executive Director
300 -1.5%
318.02
US$95,406
300 -1.5% 318.02 US$95,406
2026-06-01 2026-06-01 PrS Proposed sale

Officer

Officer
6,000
314.43
US$1,886,583
6,000 314.43 US$1,886,583
2026-06-01 2026-06-01 PrS Proposed sale

Director

Non-Executive Director
300
318.02
US$95,406
300 318.02 US$95,406
2026-05-28 2026-05-27 S Sale Non-Executive Director
2,100 -17.3%
327.95
US$688,703
2,100 -17.3% 327.95 US$688,703
2026-05-28 2026-05-27 PlS Planned sale Non-Executive Director
2,800 -12.3%
338.58
US$948,024
2,800 -12.3% 338.58 US$948,024
2026-05-28 2026-05-27 PlS Planned sale Non-Executive Director
213 -0.9%
337.05
US$71,792
213 -0.9% 337.05 US$71,792
2026-05-28 2026-05-27 PlS Planned sale Non-Executive Director
1,626 -6.6%
336.54
US$547,219
1,626 -6.6% 336.54 US$547,219
2026-05-28 2026-05-27 PlS Planned sale Non-Executive Director
1,811 -6.8%
335.46
US$607,514
1,811 -6.8% 335.46 US$607,514
2026-05-28 2026-05-27 PlS Planned sale Non-Executive Director
4,876 -15.6%
332.04
US$1,619,034
4,876 -15.6% 332.04 US$1,619,034
2026-05-28 2026-05-27 PlS Planned sale Non-Executive Director
8,210 -20.8%
331.45
US$2,721,195
8,210 -20.8% 331.45 US$2,721,195
2026-05-28 2026-05-27 PlS Planned sale Non-Executive Director
464 -1.2%
330.38
US$153,298
464 -1.2% 330.38 US$153,298
2026-05-27 2026-05-27 PrS Proposed sale

Director

Non-Executive Director
2,100
327.95
US$688,704
2,100 327.95 US$688,704
2026-05-27 2026-05-27 PrS Proposed sale

Officer

Officer
20,000
333.40
US$6,668,075
20,000 333.40 US$6,668,075
2026-05-27 2026-05-26 PlS Planned sale

EVP, Global Str Mktg & GM, MSD

Officer
2,500 -13.3%
330.50
US$826,250
2,500 -13.3% 330.50 US$826,250
2026-05-26 2026-05-26 PrS Proposed sale

Officer

Officer
2,500
330.50
US$826,250
2,500 330.50 US$826,250
2026-05-26 2026-05-22 PlS Planned sale

EVP & CFO

Officer
8,810 -100.0%
315.48
US$2,779,379
8,810 -100.0% 315.48 US$2,779,379
2026-05-26 2026-05-22 PlS Planned sale

President & CEO

Executive Director
10,000 -6.5%
315.48
US$3,154,800
10,000 -6.5% 315.48 US$3,154,800
2026-05-22 2026-05-22 PrS Proposed sale

Officer; Director

Executive Director
10,000
315.48
US$3,154,800
10,000 315.48 US$3,154,800
2026-05-22 2026-05-22 PrS Proposed sale

Officer

Officer
8,810
315.48
US$2,779,379
8,810 315.48 US$2,779,379
2026-05-19 2026-05-18 S Sale Non-Executive Director
1,350 -14.8%
303.40
US$409,590
1,350 -14.8% 303.40 US$409,590
2026-05-18 2026-05-18 PrS Proposed sale

Director

Non-Executive Director
1,350
303.40
US$409,590
1,350 303.40 US$409,590
2026-05-15 2026-05-14 S Sale Non-Executive Director
1,000 -10.2%
312.20
US$312,197
1,000 -10.2% 312.20 US$312,197
2026-05-14 2026-05-14 PrS Proposed sale

Director

Non-Executive Director
1,000
312.20
US$312,197
1,000 312.20 US$312,197
2026-05-14 2026-05-13 S Sale Non-Executive Director
1,400 -12.5%
318.99
US$446,586
1,400 -12.5% 318.99 US$446,586
2026-05-13 2026-05-13 PrS Proposed sale

Director

Non-Executive Director
1,400
318.99
US$446,586
1,400 318.99 US$446,586
2026-05-12 2026-05-11 S Sale

EVP & GM, VSD

Officer
2,849 -18.4%
319.93
US$911,328
2,849 -18.4% 319.93 US$911,328
2026-05-12 2026-05-11 S Sale

EVP, GC & Secretary

Officer
4,355 -8.1%
319.94
US$1,393,317
4,355 -8.1% 319.94 US$1,393,317
2026-05-11 2026-05-11 PrS Proposed sale

Officer

Officer
2,849
319.88
US$911,328
2,849 319.88 US$911,328
2026-05-11 2026-05-11 PrS Proposed sale

Officer

Officer
4,355
319.94
US$1,393,317
4,355 319.94 US$1,393,317
2026-03-13 2026-03-12 S Sale Non-Executive Director
340 -3.2%
213.77
US$72,705
340 -3.2% 213.77 US$72,705
2026-03-12 2026-03-12 PrS Proposed sale

Director

Non-Executive Director
341
213.21
US$72,705
341 213.21 US$72,705
2026-03-09 2026-03-06 S Sale

EVP & GM, VSD

Officer
4,568 -22.8%
220.52
US$1,007,318
4,568 -22.8% 220.52 US$1,007,318
2026-03-06 2026-03-06 PrS Proposed sale

Officer

Officer
4,568
220.52
US$1,007,318
4,568 220.52 US$1,007,318
2026-03-03 2026-03-02 PlS Planned sale Non-Executive Director
300 -1.6%
239.44
US$71,832
300 -1.6% 239.44 US$71,832
2026-03-02 2026-03-02 PrS Proposed sale

Director

Non-Executive Director
300
239.44
US$71,832
300 239.44 US$71,832
2026-02-25 2026-02-24 S Sale

EVP & COO

Officer
4,100 -14.9%
255.00
US$1,045,500
4,100 -14.9% 255.00 US$1,045,500
2026-02-24 2026-02-24 S Sale Non-Executive Director
10,000 -20.0%
253.97
US$2,539,675
10,000 -20.0% 253.97 US$2,539,675
2026-02-24 2026-02-24 PrS Proposed sale

Officer

Officer
4,100
255.00
US$1,045,500
4,100 255.00 US$1,045,500
2026-02-24 2026-02-20 S Sale Non-Executive Director
10,000 -16.7%
252.90
US$2,528,999
10,000 -16.7% 252.90 US$2,528,999
2026-02-23 2026-02-20 S Sale Non-Executive Director
1,250 -13.0%
258.06
US$322,574
1,250 -13.0% 258.06 US$322,574
2026-02-23 2026-02-20 S Sale

EVP & GM, VSD

Officer
1,453 -6.8%
247.55
US$359,623
1,453 -6.8% 247.55 US$359,623
2026-02-23 2026-02-20 S Sale

EVP, Global Str Mktg & GM, MSD

Officer
2,000 -9.6%
261.56
US$523,120
2,000 -9.6% 261.56 US$523,120
2026-02-23 2026-02-20 S Sale

VP & Chief Accounting Officer

Officer
816 -100.0%
250.35
US$204,284
816 -100.0% 250.35 US$204,284
2026-02-23 2026-02-20 S Sale

VP & Chief Accounting Officer

Officer
650 -44.3%
249.57
US$162,219
650 -44.3% 249.57 US$162,219
2026-02-23 2026-02-20 S Sale Non-Executive Director
829 -7.2%
247.55
US$205,219
829 -7.2% 247.55 US$205,219
2026-02-23 2026-02-20 S Sale

EVP & GM, PSD

Officer
2,043 -35.9%
256.41
US$523,744
2,043 -35.9% 256.41 US$523,744
2026-02-23 2026-02-20 S Sale

EVP, GC & Secretary

Officer
4,254 -7.3%
250.00
US$1,063,500
4,254 -7.3% 250.00 US$1,063,500
2026-02-23 2026-02-20 S Sale

President & CEO

Executive Director
1,890 -1.2%
259.70
US$490,839
1,890 -1.2% 259.70 US$490,839
2026-02-23 2026-02-20 S Sale

President & CEO

Executive Director
1,988 -1.3%
257.81
US$512,523
1,988 -1.3% 257.81 US$512,523
2026-02-23 2026-02-20 S Sale

President & CEO

Executive Director
12,812 -7.5%
256.93
US$3,291,804
12,812 -7.5% 256.93 US$3,291,804
2026-02-23 2026-02-20 S Sale

President & CEO

Executive Director
13,310 -7.2%
256.05
US$3,408,076
13,310 -7.2% 256.05 US$3,408,076
2026-02-20 2026-02-20 PrS Proposed sale

Director

Non-Executive Director
20,000
252.90
US$5,057,996
20,000 252.90 US$5,057,996
2026-02-20 2026-02-20 PrS Proposed sale

Officer

Officer
2,000
261.56
US$523,120
2,000 261.56 US$523,120
2026-02-20 2026-02-20 PrS Proposed sale

Director

Non-Executive Director
1,250
258.06
US$322,574
1,250 258.06 US$322,574
2026-02-20 2026-02-20 PrS Proposed sale

Officer; Director

Executive Director
30,000
247.55
US$7,426,500
30,000 247.55 US$7,426,500
2026-02-20 2026-02-20 PrS Proposed sale

Officer

Officer
2,043
256.36
US$523,744
2,043 256.36 US$523,744
2026-02-20 2026-02-20 PrS Proposed sale

Officer

Officer
1,453
247.50
US$359,623
1,453 247.50 US$359,623
2026-02-20 2026-02-20 PrS Proposed sale

Officer

Officer
1,466
250.00
US$366,503
1,466 250.00 US$366,503
2026-02-20 2026-02-20 PrS Proposed sale

Officer

Officer
4,254
250.00
US$1,063,500
4,254 250.00 US$1,063,500
2026-02-20 2026-02-20 PrS Proposed sale

Director

Non-Executive Director
829
247.55
US$205,219
829 247.55 US$205,219

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