William Blair & Company
FSLY icon

William Blair & Company’s Fastly Inc FSLY Stock Holding History

William Blair & Company’s Portfolio FSLY Stock Details FSLY Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$223K Buy
12,129
+10
+0.1% +$217 ﹤0.01% 1536
2026
Q1 		$352K Buy
+12,119
New +$199K ﹤0.01% 1271
2024
Q2 		– Sell
-13,484
Closed -$175K – 1840
2024
Q1 		$175K Sell
13,484
-500
-4% -$8.45K ﹤0.01% 1430
2023
Q4 		$249K Sell
13,984
-4,273
-23% -$72.1K ﹤0.01% 1323
2023
Q3 		$350K Buy
18,257
+2,181
+14% +$42.6K ﹤0.01% 1168
2023
Q2 		$254K Sell
16,076
-381
-2% -$5.84K ﹤0.01% 1319
2023
Q1 		$292K Sell
16,457
-4,800
-23% -$61K ﹤0.01% 1252
2022
Q4 		$174K Sell
21,257
-480
-2% -$4.2K ﹤0.01% 1397
2022
Q3 		$199K Sell
21,737
-374
-2% -$3.98K ﹤0.01% 1388
2022
Q2 		$257K Sell
22,111
-15,084
-41% -$213K ﹤0.01% 1323
2022
Q1 		$646K Sell
37,195
-3,786
-9% -$88.4K ﹤0.01% 1066
2021
Q4 		$1.45M Sell
40,981
-7,905
-16% -$344K ﹤0.01% 818
2021
Q3 		$1.98M Sell
48,886
-42,161
-46% -$1.95M 0.01% 710
2021
Q2 		$5.43M Sell
91,047
-1,756
-2% -$99.8K 0.02% 442
2021
Q1 		$6.24M Buy
92,803
+8,206
+10% +$705K 0.02% 409
2020
Q4 		$7.39M Sell
84,597
-9,076
-10% -$800K 0.03% 365
2020
Q3 		$8.78M Buy
93,673
+16,541
+21% +$1.44M 0.04% 297
2020
Q2 		$6.57M Sell
77,132
-28,280
-27% -$1.11M 0.03% 331
2020
Q1 		$2M Buy
105,412
+37,032
+54% +$765K 0.01% 510
2019
Q4 		$1.37M Buy
68,380
+33,159
+94% +$699K 0.01% 702
2019
Q3 		$845K Buy
35,221
+9,911
+39% +$233K ﹤0.01% 799
2019
Q2 		$513K Buy
+25,310
New +$521K ﹤0.01% 968

Other funds holding FSLY

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Capital World Investors
Capital World Investors Los Angeles, California $846B AUM 46.74% 1-Year Est. Return
First Trust Advisors
First Trust Advisors Wheaton, Illinois $170B AUM 46.21% 1-Year Est. Return
D.E. Shaw & Co
D.E. Shaw & Co New York $210B AUM 57.28% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Two Sigma Investments
Two Sigma Investments New York $138B AUM 41.87% 1-Year Est. Return
PCM
Penserra Capital Management Orinda, California $13B AUM 71.84% 1-Year Est. Return
Legal & General Group
Legal & General Group London, United Kingdom $480B AUM 42.84% 1-Year Est. Return

William Blair & Company's FSLY Position: Q2 2026 in Review

William Blair & Company increased its Fastly Inc (FSLY) stake by 0.08% in Q2 2026, buying an estimated $217 and bringing the position to 12,129 shares worth $223K. The position accounts for ﹤0.01% of the portfolio, ranked #1536.

William Blair & Company first reported a position in FSLY in Q2 2019 and has held it in 22 quarters since. The position peaked at $8.78M in Q3 2020. 282 funds tracked by Wall St. Rank hold FSLY as of Q2 2026.

  • William Blair & Company held 12,129 shares of Fastly Inc worth $223K as of Q2 2026.
  • William Blair & Company bought 10 Fastly Inc shares in Q2 2026, an estimated $217.
  • Fastly Inc made up ﹤0.01% of William Blair & Company's portfolio in Q2 2026, its #1536 holding.
  • William Blair & Company first reported a position in Fastly Inc in Q2 2019 and has held it in 22 quarters since.
  • William Blair & Company's Fastly Inc position peaked at $8.78M in Q3 2020.
  • 282 funds tracked by Wall St. Rank held Fastly Inc as of Q2 2026.

Based on William Blair & Company's 13F filing for Q2 2026, filed 11 Aug 2026.