FRONTIER CAPITAL MANAGEMENT CO.,LLC

FRONTIER CAPITAL MANAGEMENT CO.,LLC declares $2.0B in 46 of the 230 AI and semiconductor companies tracked on Silicon Floor, as of Jun 30, 2026 (Form 13F): 18.5% of its $10.7B 13F portfolio. Largest positions: Applied Optoelectronics (1.2% of the company) and Akamai (0.79% of the company). Over time: $2.0B in 46 of these companies for Q2 2026, against $1.7B in 29 for Q4 2019 (13F values as filed). From Mar 31, 2026 to Jun 30, 2026, it bought $486.2M and sold $1.2B of these stocks, at the quarter's prices: a net sale of $675.2M; 5 new positions and 6 sold out.

Performance of its AI picks

The AI-stock portfolio FRONTIER CAPITAL MANAGEMENT CO.,LLC declared for Q2 2026 (Form 13F), held unchanged, returned -16.1% in Q3 2026 (SMH -7.1%), ranked 1719 of 1,783 active managers. Over the last 12 months, quarter after quarter: +94.6% (SMH +87.2%), ranked 39 of 1,359 active managers. Over three years, quarter after quarter: +284.8% (SMH +325.8%), ranked 37 of 783 active managers. Over five years, quarter after quarter: +362.4% (SMH +389.8%), ranked 11 of 535 active managers. Trades made during a quarter are not visible in 13F filings: this measures its declared picks, not the return of its funds.

Largest positions

1. Applied Optoelectronics (AAOI) — $144.5M: 975,318 shares, 1.2% of the company, 1.3% of its portfolio (added this quarter); held since Q1 2026
2. Akamai (AKAM) — $134.4M: 1.1M shares, 0.79% of the company, 1.3% of its portfolio (added this quarter); held since Q4 2025
3. Lattice Semiconductor (LSCC) — $125.7M: 821,848 shares, 0.58% of the company, 1.2% of its portfolio (added this quarter); held since Q1 2024
4. MongoDB (MDB) — $112.2M: 334,098 shares, 0.41% of the company, 1.0% of its portfolio (added this quarter); held since Q4 2019 or earlier
5. Sanmina (SANM) — $95.7M: 378,111 shares, 0.71% of the company, 0.89% of its portfolio (trimmed this quarter); held since Q4 2023
6. Ultra Clean (UCTT) — $95.2M: 667,532 shares, 1.5% of the company, 0.89% of its portfolio (trimmed this quarter); held since Q4 2022
7. Modine (MOD) — $91.8M: 343,868 shares, 0.65% of the company, 0.86% of its portfolio (added this quarter); held since Q4 2019 or earlier
8. Astera Labs (ALAB) — $74.7M: 154,601 shares, 0.09% of the company, 0.70% of its portfolio (trimmed this quarter); held since Q1 2025
9. indie Semiconductor (INDI) — $71.5M: 15.9M shares, 6.9% of the company, 0.67% of its portfolio (trimmed this quarter); held since Q2 2023
10. Entegris (ENTG) — $63.3M: 351,950 shares, 0.23% of the company, 0.59% of its portfolio (trimmed this quarter); held since Q3 2024
11. Hubbell (HUBB) — $62.8M: 119,997 shares, 0.23% of the company, 0.59% of its portfolio (added this quarter); held since Q4 2023
12. Flex (FLEX) — $61.9M: 382,135 shares, 0.10% of the company, 0.58% of its portfolio (added this quarter); held since Q4 2019 or earlier
13. Jabil (JBL) — $58.7M: 152,187 shares, 0.15% of the company, 0.55% of its portfolio (trimmed this quarter); held since Q4 2019 or earlier
14. Snowflake (SNOW) — $57.6M: 226,439 shares, 0.06% of the company, 0.54% of its portfolio (added this quarter); held since Q1 2025
15. MKS (MKSI) — $53.7M: 120,625 shares, 0.18% of the company, 0.50% of its portfolio (trimmed this quarter); held since Q4 2019 or earlier

By sector

• Chips & compute — $347.2M, 18% of its AI holdings, 9 companies
• Power, electrical & cooling — $297.5M, 15% of its AI holdings, 8 companies
• AI software — $295.4M, 15% of its AI holdings, 6 companies
• Equipment & test — $275.5M, 14% of its AI holdings, 6 companies
• Neoclouds & data centers — $222.1M, 11% of its AI holdings, 6 companies
• Servers & systems — $216.3M, 11% of its AI holdings, 3 companies
• Optics — $184.5M, 9% of its AI holdings, 3 companies
• Interconnect — $141.0M, 7% of its AI holdings, 3 companies
• Memory & storage — $1.4M, 0% of its AI holdings, 2 companies

Biggest changes this quarter

• trimmed Astera Labs (ALAB): -$257.7M at the quarter's price
• trimmed Ultra Clean (UCTT): -$159.7M at the quarter's price
• added to Applied Optoelectronics (AAOI): +$102.4M at the quarter's price
• trimmed Silicon Motion (SIMO): -$89.9M at the quarter's price
• trimmed Cohu (COHU): -$80.8M at the quarter's price
• trimmed Entegris (ENTG): -$72.4M at the quarter's price
• trimmed Sanmina (SANM): -$65.6M at the quarter's price
• trimmed Monolithic Power (MPWR): -$64.9M at the quarter's price
• sold out of Marvell (MRVL): -$53.6M at the quarter's price
• added to Hubbell (HUBB): +$49.7M at the quarter's price

Schedule 13D/G declarations

• indie Semiconductor (INDI) — 13G filed Aug 14, 2026: 15.9M shares as of Jun 30, 2026, 7.5% as declared
• Ultra Clean (UCTT) — 13G filed May 15, 2026: 1.8M shares as of Mar 31, 2026, 3.9% as declared
• Ultra Clean (UCTT) — 13G filed Feb 17, 2026: 3.5M shares as of Dec 31, 2025, 7.7% as declared
• Ultra Clean (UCTT) — 13G filed Aug 14, 2025: 2.8M shares as of Jun 30, 2025, 6.1% as declared
• indie Semiconductor (INDI) — 13G filed Aug 14, 2025: 18.0M shares as of Jun 30, 2025, 9.2% as declared
• indie Semiconductor (INDI) — 13G filed May 14, 2025: 13.8M shares as of Mar 31, 2025, 7.2% as declared
• indie Semiconductor (INDI) — 13G filed Jan 21, 2025: 17.4M shares as of Dec 31, 2024, 9.4% as declared
• indie Semiconductor (INDI) — 13G filed Jan 16, 2025: 10.9M shares as of Sep 30, 2024, 5.9% as declared
• Ultra Clean (UCTT) — 13G filed Jan 16, 2025: 2.2M shares as of Sep 30, 2024, 4.8% as declared

Other holders of this size

• Vanguard — $3.6T in 225 of these companies
• BlackRock — $3.1T in 226 of these companies
• State Street — $1.6T in 222 of these companies
• Fidelity (FMR) — $1.2T in 223 of these companies
• Geode Capital — $890.9B in 220 of these companies
• Capital Group — $881.7B in 132 of these companies
• JPMorgan — $717.8B in 225 of these companies
• Invesco — $683.3B in 220 of these companies

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