Heffernan Advisory, Inc reported 29 positions worth $39.98M for the quarter ended Sep 30, 2026, up 548.9% on the prior quarter. It opened 12 new positions, added to 15, trimmed 0 and exited 2. Its largest holding is Arthur J. Gallagher & Co. at 72.1% of the portfolio.
Reported 13F market value at each quarter end. A change mixes trading with price moves in the positions held.
Dollar value of shares bought and sold each quarter, at that quarter’s price. It counts trading only, not price changes.
How many positions were opened, added to, trimmed or closed each quarter.
Share of reported value in each sector at every quarter end.
| Holding | Change | Change % | Trade Value | Weight |
|---|---|---|---|---|
| AJG Arthur J. Gallagher & Co. | +126.4K | – | $28.84M | 72.14% |
| STX Seagate Technology Holdings plc | +750 | +83.3% | $691.76K | 3.81% |
| AMD Advanced Micro Devices Inc | +810 | – | $495.53K | 1.24% |
| GOOGL Alphabet Inc. | +1,305 | – | $449.02K | 1.12% |
| META Meta Platforms, Inc. | +553 | – | $401.03K | 1% |
| AMZN Amazon Com Inc | +1,376 | – | $342.83K | 0.858% |
| XPO XPO, Inc. | +1,920 | – | $337.88K | 0.845% |
| CRWD CrowdStrike Holdings, Inc. | +1,260 | – | $333.59K | 0.834% |
| NVDA Nvidia Corp | +1,381 | – | $315.39K | 0.789% |
| MRVL Marvell Technology, Inc. | +1,173 | +98.1% | $309.92K | 1.57% |
| Holding | Shares | Trade Value | Weight |
|---|---|---|---|
| AJG Arthur J. Gallagher & Co. | +126.4K | $28.84M | 72.14% |
| AMD Advanced Micro Devices Inc | +810 | $495.53K | 1.24% |
| GOOGL Alphabet Inc. | +1,305 | $449.02K | 1.12% |
| META Meta Platforms, Inc. | +553 | $401.03K | 1% |
| AMZN Amazon Com Inc | +1,376 | $342.83K | 0.858% |
| XPO XPO, Inc. | +1,920 | $337.88K | 0.845% |
| CRWD CrowdStrike Holdings, Inc. | +1,260 | $333.59K | 0.834% |
| NVDA Nvidia Corp | +1,381 | $315.39K | 0.789% |
| JPM Jpmorgan Chase & Co | +803 | $265.66K | 0.665% |
| PLTR Palantir Technologies Inc. | +1,360 | $254.39K | 0.636% |
| # | Activity | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | AJG Arthur J. Gallagher & Co. | Financial Services | 126.4K | $28.84M | 72.14% | +126.4K | – | New | 0.05% |
| 2 | STX Seagate Technology Holdings plc | Technology | 1,650 | $1.52M | 3.81% | +750 | +83.3% | Added | 0% |
| 3 | MA Mastercard Inc | Financial Services | 1,274 | $702.57K | 1.76% | +180 | +16.5% | Added | 0% |
| 4 | MRVL Marvell Technology, Inc. | Technology | 2,369 | $625.91K | 1.57% | +1,173 | +98.1% | Added | 0% |
| 5 | MSFT Microsoft Corp | Technology | 1,086 | $557.01K | 1.39% | +322 | +42.1% | Added | 0% |
| 6 | V Visa Inc. | Financial Services | 1,458 | $523.90K | 1.31% | +417 | +40.1% | Added | 0% |
| 7 | AMD Advanced Micro Devices Inc | Technology | 810 | $495.53K | 1.24% | +810 | – | New | 0% |
| 8 | PANW Palo Alto Networks Inc | Technology | 1,210 | $480.75K | 1.2% | +610 | +101.7% | Added | 0% |
| 9 | AAPL Apple Inc. | Technology | 1,402 | $466.89K | 1.17% | +10 | +0.7% | Added | 0% |
| 10 | GOOGL Alphabet Inc. | Technology | 1,305 | $449.02K | 1.12% | +1,305 | – | New | 0% |
| 11 | META Meta Platforms, Inc. | Technology | 553 | $401.03K | 1% | +553 | – | New | 0% |
| 12 | CIEN Ciena Corp | Technology | 1,020 | $358.86K | 0.898% | +520 | +104.0% | Added | 0% |
| 13 | AMZN Amazon Com Inc | Consumer Discretionary | 1,376 | $342.83K | 0.858% | +1,376 | – | New | 0% |
| 14 | FLEX Flex Ltd. | Technology | 3,100 | $340.97K | 0.853% | +600 | +24.0% | Added | 0% |
| 15 | XPO XPO, Inc. | Industrials | 1,920 | $337.88K | 0.845% | +1,920 | – | New | 0% |
Tip. Select a row to see that position’s full history at Heffernan Advisory.
As of its Q3 2026 13F filing, Heffernan Advisory, Inc’s five largest positions were Arthur J. Gallagher & Co. (AJG) at 72.1%, Seagate Technology Holdings plc (STX) at 3.8%, Mastercard Inc (MA) at 1.8%, Marvell Technology, Inc. (MRVL) at 1.6%, Microsoft Corp (MSFT) at 1.4% of the reported portfolio.
Heffernan Advisory, Inc reported a 13F portfolio worth $39.98M across 29 positions for Q3 2026. That is up 548.9% from the previous quarter.
Its largest purchases by value were Arthur J. Gallagher & Co. ($28.84M), Seagate Technology Holdings plc ($691.76K), Advanced Micro Devices Inc ($495.53K). It opened 12 new positions.
Its largest sales by value were Maxlinear, Inc ($256.06K), Vivmark Residential ($215.95K). It exited 2 positions entirely.
From the Form 13F-HR reports Heffernan Advisory, Inc files with the SEC each quarter, within 45 days of quarter end. A 13F lists long positions in US-listed equities and options; it excludes short positions, cash, bonds and most non-US holdings.
13F data reflects long positions in US-listed equities and options as reported to the SEC up to 45 days after quarter end. It excludes short positions, cash, bonds and most non-US securities, so it is not a complete picture of a manager’s assets.