Affiliated Managers Group, Inc AMG

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Affiliated Managers Group, Inc. Common Stock · Company · NYSE

Announcement types: (default: consequential filings)
Results & current reports
Capital markets
Ownership & governance

USD closing-price chart (daily close from yfinance · Last year)

USD 208.70 → 346.70 · 66.1%
379.590293.325207.060 1 2 3 4 5 6,7 8 9 10,11 12 13 14,15 16 17 18 19 Jul 25Oct 25Jan 26Apr 26Jul 26

Numbered dotted lines mark the filtered filings under Announcement Events below.

Price & SEC Filing History 22 Jul 2025 — 23 Jul 2026 (Last year)

Daily NYSE prices are sourced from yfinance. Yellow highlighting marks an intraday rise or a gap up between adjacent trading sessions. SEC acceptance times are converted to US Eastern time: pre-market filings appear below that day’s OHLCV row; filings accepted after the 09:30 ET open appear above it. The SEC does not publish an exact first-public-availability timestamp, so acceptance time is the best available proxy.

No data yet
340.8500 355.8200 343.3300 346.7000 317,275
368.2100 373.5500 328.1100 340.5800 910,100
373.2400 377.1600 365.8600 366.1200 109,700
Weekend
Weekend
367.7700 373.7400 359.9400 369.8300 217,300
377.1100 381.0600 373.1300 376.7900 190,300
370.0000 382.7500 369.9300 379.5900 170,500
359.9800 368.8600 359.9800 366.0000 194,300
365.5800 369.1400 357.8600 359.7800 234,600
Weekend
Weekend
368.4000 369.9400 366.2000 366.4100 198,100
359.3900 366.4700 356.3100 364.9600 221,000
357.8500 360.3100 353.6800 356.2700 232,900
360.4500 361.7500 354.4000 359.7200 285,000
345.3400 357.8500 344.4400 356.6100 292,200
Weekend
Weekend
No trading
340.7900 345.6100 337.9600 344.6000 204,100
338.5000 348.5000 336.7600 336.9100 303,900
344.3300 349.2100 336.3600 338.4000 550,900
342.0500 343.9400 334.2000 342.4600 489,300
Weekend
Weekend
340.1900 344.5500 337.5700 341.9800 450,900
342.5200 346.5900 337.3500 340.0800 199,400
350.1500 350.3800 337.5100 339.1000 257,100
352.2700 356.3400 349.3500 350.2200 259,600
354.9200 358.9900 349.0000 357.3100 317,000
Weekend
Weekend
No trading
361.5300 361.7800 351.1600 352.9000 646,700
357.4200 362.9400 353.9400 355.6700 255,900
355.8500 359.4900 353.9200 357.5000 169,700
359.3000 363.8900 352.1200 352.9300 260,500
Weekend
Weekend
347.0800 355.5500 346.0000 354.6200 371,500
341.1300 345.8100 335.5600 344.3300 233,300
339.4200 346.7900 334.6000 335.3400 325,800
19 · 8-K After-hours · 16:30 ET 8-K ↗
339.5800 348.1500 333.0100 342.1200 362,700
337.0900 345.0700 334.9800 336.6200 613,000
Weekend
Weekend
332.7100 338.0700 328.3800 336.8100 611,100
312.6200 336.7600 312.6200 334.8200 544,300
306.5200 312.8700 299.8100 311.6100 383,100
302.3900 312.3000 301.9000 310.5200 310,200
302.3900 307.3500 300.0400 302.4500 258,100
Weekend
Weekend
303.1600 307.1000 301.7000 302.8500 500,400
18 · 8-K After-hours · 16:30 ET 8-K ↗
305.8800 308.7100 301.6300 302.9600 297,100
308.9500 313.3500 303.5100 307.9200 451,300
304.0800 309.7500 303.3000 308.6500 227,900
No trading
Weekend
Weekend
303.5300 306.4700 295.7800 301.9600 262,700
299.4200 302.8400 295.4100 302.6300 338,100
296.9300 303.5300 294.9900 301.3400 355,400
296.5600 299.5700 293.4900 294.9000 232,300
293.9700 301.3900 291.2500 297.0300 231,800
Weekend
Weekend
299.7200 301.1000 293.1800 293.9100 308,300
305.8200 307.7800 301.4800 302.1000 186,600
301.3300 304.5700 296.3200 303.4800 174,500
300.7400 303.2200 296.3700 301.5300 285,700
302.6000 304.6500 298.3900 301.2800 273,400
Weekend
Weekend
299.2700 303.4000 290.9000 302.8000 339,900
17 · 10-Q After-hours · 16:19 ET 10-Q ↗
308.8400 310.9700 296.4400 297.7600 318,000
307.2800 308.8900 303.1700 306.0200 280,500
298.8300 305.9700 295.8200 303.6400 274,900
292.0700 305.0800 291.7100 297.5300 373,100
Weekend
Weekend
301.7600 317.8100 285.9600 291.0700 561,200
16 · 8-K Pre-market · 06:37 ET 8-K ↗
288.1900 297.7200 285.0000 294.6700 473,700
292.5300 293.6000 287.1800 289.1000 335,500
292.6300 295.2400 289.3900 292.4700 279,500
287.1800 293.5600 286.3100 291.5700 281,200
Weekend
Weekend
287.8200 291.2300 283.9300 287.4400 302,400
299.1600 299.8800 270.3500 284.3900 692,400
303.1000 305.4600 298.8900 301.3000 209,400
302.8200 306.7300 299.5100 300.9100 209,500
294.3300 301.4600 293.0000 300.9700 225,100
Weekend
Weekend
15 · DEFA14A After-hours · 16:46 ET DEFA14A ↗ 14 · DEF 14A After-hours · 16:43 ET DEF 14A ↗
302.6200 308.0600 291.1900 294.9800 588,400
301.6000 304.0400 295.9200 299.4100 346,400
305.7300 306.7400 299.8100 301.1500 298,800
293.4500 305.8700 293.4500 303.2100 362,700
281.4400 292.6400 281.4400 291.1000 235,500
Weekend
Weekend
285.5800 286.3300 280.6600 285.3600 310,100
288.0800 291.3200 283.3100 286.3200 302,400
279.2200 287.1400 279.2200 286.4800 506,600
265.8100 272.0000 264.9700 270.3100 355,400
265.0100 269.6800 264.0100 267.3100 448,100
Weekend
Weekend
No trading
267.0600 270.7400 254.4400 265.5100 393,800
280.6700 283.2100 273.2500 273.5000 250,300
275.0000 281.1500 271.1000 276.7000 232,500
272.1900 275.3700 268.5000 269.8800 316,800
Weekend
Weekend
274.9400 276.5000 267.9800 268.9800 306,000
277.2500 277.2700 270.0800 276.3400 419,500
278.4000 283.3800 277.5400 280.6600 215,200
272.3400 277.2100 269.8200 275.5500 354,500
285.4400 286.7600 274.8800 275.2800 531,100
Weekend
Weekend
278.8600 280.7600 274.1600 278.1700 675,500
275.0900 282.3800 273.3500 278.6700 477,000
275.4500 281.0600 273.8400 275.6500 362,800
276.9700 285.3000 276.9700 278.8600 322,000
276.4700 278.8500 271.4800 273.0800 265,800
Weekend
Weekend
273.5400 276.5800 270.0600 271.9500 218,500
275.9900 278.8600 267.2300 270.4300 397,200
280.1400 286.3200 271.5700 282.0800 454,500
283.5400 287.6100 277.3000 280.8200 401,000
280.3900 283.2000 269.9400 281.5300 457,300
Weekend
Weekend
291.3000 291.3000 280.9600 285.7700 314,300
301.0000 306.1000 291.2500 299.1800 366,000
313.2600 313.2600 300.8500 303.1300 505,100
303.6000 312.3600 296.4500 310.3000 326,900
301.3300 315.8900 300.6200 312.9200 275,400
Weekend
Weekend
307.5500 307.5500 297.2100 306.1800 448,400
13 · 8-K After-hours · 16:31 ET 8-K ↗
315.0000 318.9000 308.6600 312.9400 349,200
305.1200 312.7900 301.9700 312.6300 364,300
291.2900 302.4400 291.0600 302.1400 490,500
286.9000 292.1600 279.0200 291.2900 405,100
Weekend
Weekend
319.4700 319.7600 285.6300 287.6900 988,500
327.7700 330.3500 320.5200 322.2300 325,300
323.9500 334.7800 321.3200 330.7500 420,200
12 · 10-K After-hours · 17:15 ET 10-K ↗
331.9500 332.8500 319.3500 323.0100 469,200
No trading
Weekend
Weekend
330.3800 330.3800 319.3200 329.7900 453,300
308.0900 329.1900 304.1200 328.9500 1,117,000
11 · 8-K Pre-market · 07:08 ET 8-K ↗ 10 · 8-K Pre-market · 06:40 ET 8-K ↗
304.6500 310.6000 289.8000 308.0900 822,900
304.7500 308.4300 299.1700 303.8000 349,400
304.3500 309.5400 304.3400 304.6200 459,400
Weekend
Weekend
306.5400 313.3200 300.0000 305.5000 358,200
307.3200 309.0000 294.1500 301.5500 473,600
307.5500 313.1700 303.5800 311.2400 335,800
316.9200 319.8500 302.0800 308.4000 474,000
313.3800 317.4000 310.6200 316.3200 335,900
Weekend
Weekend
310.2500 315.5100 309.7000 313.0900 501,400
316.0600 319.4600 309.5300 312.7700 292,600
309.4500 315.0900 307.4400 313.5800 281,600
314.8700 315.5000 304.9200 307.5600 487,800
321.2700 322.4300 309.3500 312.7700 532,300
Weekend
Weekend
327.0000 327.3000 319.0200 319.8200 296,500
330.5400 334.0000 328.3700 329.5700 250,600
321.6100 331.7300 321.5000 327.9600 455,100
323.4800 330.0000 317.1000 318.7800 477,400
No trading
Weekend
Weekend
321.2200 327.5300 321.2200 326.1200 345,500
317.5700 325.6600 317.5700 322.2300 384,000
312.0000 315.9400 310.0000 315.1900 230,900
310.7100 313.5600 309.3200 310.8400 241,000
305.5000 313.2400 303.7600 312.2900 373,800
Weekend
Weekend
306.3900 309.3500 305.5000 308.0300 336,200
306.4500 311.5100 305.3400 307.3100 497,200
309.7900 309.7900 303.8000 307.7000 410,500
303.6300 310.3200 300.8000 310.3100 324,100
288.9300 305.6300 288.9300 303.5700 461,600
Weekend
Weekend
288.7500 291.2100 287.3300 288.8500 515,600
No trading
289.5800 291.8700 287.5400 288.2800 414,600
292.0000 293.3500 286.3200 290.3500 477,900
294.9800 298.0400 290.0200 292.0800 470,700
Weekend
Weekend
291.6800 299.6900 291.4200 296.0700 323,300
No trading
293.0300 293.7400 290.8800 291.1300 175,200
287.5600 292.4300 287.5600 292.2900 368,800
280.5000 287.8600 279.8600 287.6700 484,300
Weekend
Weekend
275.9100 280.5200 275.3800 279.0900 1,097,700
274.8300 276.9900 272.3500 274.8300 584,800
274.9400 277.6500 269.5100 271.5100 571,800
275.8900 275.9500 270.0000 273.1500 296,900
281.8900 281.8900 273.3400 275.3700 348,400
Weekend
Weekend
281.9800 281.9800 275.2000 277.4100 231,000
9 · 8-K After-hours · 16:30 ET 8-K ↗
279.8400 283.2200 277.0400 280.1600 666,900
8 · 424B5 After-hours · 16:33 ET 424B5 ↗
271.7700 280.7100 270.0000 279.6000 815,600
271.0500 276.2000 270.0000 271.0600 940,000
7 · 8-K After-hours · 17:04 ET 8-K ↗
273.5100 275.6100 267.2600 270.2100 232,300
6 · 424B5 Pre-market · 08:39 ET 424B5 ↗
Weekend
Weekend
270.8000 274.1600 270.4500 273.1900 155,300
272.1700 276.4000 268.1400 271.6900 140,700
266.3900 272.1600 266.3900 271.5500 200,800
268.5800 276.2400 264.0100 266.1600 215,000
266.4100 272.0000 266.4100 267.5800 393,500
Weekend
Weekend
264.0100 270.2800 264.0100 268.8300 116,800
No trading
266.2400 271.4800 265.3900 267.6000 251,400
260.6000 266.3000 259.8400 266.1100 304,700
257.0800 263.5900 256.7900 263.2300 272,800
Weekend
Weekend
254.4300 258.8200 252.0000 256.8700 280,000
257.8300 261.2700 251.3300 252.9200 372,900
250.2500 254.4100 248.1100 253.8500 414,200
250.1700 253.2000 246.1100 250.4600 161,400
257.7400 259.6000 248.7100 251.2300 259,300
Weekend
Weekend
257.3200 259.9900 254.9000 258.3100 308,900
262.0900 265.5900 257.3500 259.1000 302,700
258.0200 264.8100 256.9200 264.8000 417,800
259.8300 260.6000 256.4400 257.6500 512,100
262.0000 262.6800 258.0500 259.5700 147,800
Weekend
Weekend
258.0900 259.3300 251.1900 259.2600 347,400
5 · 10-Q After-hours · 16:22 ET 10-Q ↗
256.8700 261.3200 254.9600 258.7900 280,400
252.4300 259.4700 251.4900 256.7400 334,800
256.5400 256.5400 250.8700 251.4400 399,700
247.9000 256.8100 242.7700 256.5600 698,700
4 · 8-K Pre-market · 07:09 ET 8-K ↗
Weekend
Weekend
236.9600 240.9100 236.3200 237.9600 335,000
237.1900 240.1900 236.5000 236.6800 151,700
238.0200 240.7600 235.0400 237.9000 172,900
240.5300 241.8200 239.0300 240.5500 178,000
242.9900 247.6600 241.8400 242.0100 251,700
Weekend
Weekend
238.9500 243.0000 237.1300 240.2700 191,800
238.7900 241.6000 235.9800 238.9500 175,500
238.8200 239.9700 234.2300 236.9100 248,500
240.7800 245.3500 237.8200 238.8000 276,700
237.6900 244.3300 236.5900 243.1000 283,800
Weekend
Weekend
233.4500 236.6800 231.5300 235.6000 171,000
240.2800 242.7300 232.1900 233.8500 204,200
241.5900 242.5000 236.4900 238.7800 140,400
235.0500 243.6500 235.0500 239.1300 252,500
233.6200 238.5800 233.6200 236.7500 139,600
Weekend
Weekend
241.5800 244.0300 230.2600 230.7800 182,900
243.8100 245.9300 239.5400 241.8300 109,100
241.6300 245.5000 238.4300 242.1300 177,400
246.2000 246.2000 239.2600 239.9500 192,300
243.2100 245.9800 239.0700 244.9000 170,800
Weekend
Weekend
238.2200 243.8200 237.2600 243.0400 437,000
231.3000 236.6400 230.1000 236.5500 187,600
236.8500 236.8500 230.8900 231.0100 219,300
238.9300 240.7000 236.4100 238.4300 144,100
240.7300 240.7300 237.2600 238.7300 145,400
Weekend
Weekend
238.3800 241.0200 238.2100 239.0400 179,800
235.2700 238.2600 235.2300 237.6600 134,500
242.0500 243.6000 235.9700 237.2400 230,800
246.1400 250.1500 240.8000 241.8500 324,300
242.3700 245.0000 240.0900 244.0100 211,600
Weekend
Weekend
244.5200 245.3400 242.0800 242.8700 328,700
240.0000 245.9700 238.3000 244.3400 268,000
235.7400 240.7900 234.9200 238.2800 346,000
235.0000 236.8300 233.6900 234.7800 250,100
236.1100 238.1400 233.6900 234.8800 224,100
Weekend
Weekend
235.9700 238.2900 235.1600 236.1100 206,400
231.2500 237.1800 231.2500 235.9600 275,000
232.1300 234.6200 230.2800 232.4400 157,800
230.7900 233.1800 229.6500 231.9600 197,200
229.0000 231.3900 229.0000 231.1900 132,300
Weekend
Weekend
233.3700 235.0000 228.5300 230.2800 119,600
232.0000 233.2500 228.8800 233.0500 144,700
228.5500 232.0000 227.2200 230.6400 189,700
230.6100 230.6100 224.5900 229.9700 307,200
No trading
Weekend
Weekend
227.6200 227.9400 223.4400 224.8200 137,200
228.6800 228.6800 225.3000 227.4200 174,300
224.8300 229.4000 224.7600 227.7900 189,600
224.6300 226.8500 224.0600 226.3100 190,000
224.7200 226.1800 223.6600 224.3800 146,700
Weekend
Weekend
219.5200 225.9800 218.2200 224.9400 217,000
215.6000 219.0900 215.6000 218.3500 92,700
217.4100 218.8600 215.0000 216.8500 145,700
218.4500 220.3100 216.4200 217.6500 201,200
216.7500 219.7900 215.8500 219.0900 258,900
Weekend
Weekend
222.3900 222.9400 218.3000 218.7000 129,900
3 · 8-K After-hours · 16:31 ET 8-K ↗
221.5900 224.3000 220.0100 222.9900 136,800
220.5500 223.9700 218.6900 223.3500 221,200
215.5600 219.8900 215.5600 219.7000 151,900
211.7100 214.6800 211.7100 214.0200 110,400
Weekend
Weekend
210.8700 214.3300 210.8700 211.3000 102,700
2 · 10-Q After-hours · 16:11 ET 10-Q ↗
215.3400 216.7800 208.3400 209.7600 183,300
213.5000 214.6900 211.5300 213.8800 148,700
213.4100 214.1500 208.2200 212.6500 132,000
211.2100 217.1200 209.5100 214.5200 235,300
Weekend
Weekend
207.5700 207.5700 200.0000 207.0600 197,100
210.4900 220.0000 208.3800 209.8700 281,800
1 · 8-K Pre-market · 07:12 ET 8-K ↗
210.9800 212.8700 208.6700 210.5300 127,500
214.3300 214.4600 210.0400 211.2100 115,500
216.3200 216.3200 211.7900 212.5700 168,600
Weekend
Weekend
212.0900 216.2000 210.3400 215.7700 258,600
210.1100 212.3800 209.2100 211.1700 115,500
210.5100 210.8600 208.6000 210.2200 105,700
206.1000 209.4500 205.2700 208.7000 205,100

Announcement Events

Each title opens the filing on the SEC website. Registered users can summarise the filing and up to seven relevant exhibits linked within the same SEC submission.

19 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:30 ET Summarise
18 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:30 ET Summarise
17 10-Q 10-Q (opens SEC filing in a new tab) After-hours · 16:19 ET Summarise
16 8-K 8-K (opens SEC filing in a new tab) Pre-market · 06:37 ET Summarise
15 DEFA14A DEFA14A (opens SEC filing in a new tab) After-hours · 16:46 ET Summarise
14 DEF 14A DEF 14A (opens SEC filing in a new tab) After-hours · 16:43 ET Summarise
13 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:31 ET Summarise
12 10-K 10-K (opens SEC filing in a new tab) After-hours · 17:15 ET Summarise
11 8-K 8-K (opens SEC filing in a new tab) Pre-market · 07:08 ET Summarise
10 8-K 8-K (opens SEC filing in a new tab) Pre-market · 06:40 ET Summarise
9 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:30 ET Summarise
8 424B5 424B5 (opens SEC filing in a new tab) After-hours · 16:33 ET Summarise
7 8-K 8-K (opens SEC filing in a new tab) After-hours · 17:04 ET Summarise
6 424B5 424B5 (opens SEC filing in a new tab) Pre-market · 08:39 ET Summarise
5 10-Q 10-Q (opens SEC filing in a new tab) After-hours · 16:22 ET Summarise
4 8-K 8-K (opens SEC filing in a new tab) Pre-market · 07:09 ET Summarise
3 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:31 ET Summarise
2 10-Q 10-Q (opens SEC filing in a new tab) After-hours · 16:11 ET Summarise
1 8-K 8-K (opens SEC filing in a new tab) Pre-market · 07:12 ET Summarise