Listed by Authorized Dealer
2025 Boston Whaler 405 Conquest For Sale
St Petersburg, FL
$1,249,999
$50KTakes less than a minute. Direct bank rates, no markup.
Vessel Description
2025 Boston Whaler 405 Conquest for Sale in St Petersburg, FL
MarineMax Yachts is proud to present MA BELLE, an exceptionally well-equipped, like-new 2025 Boston Whaler 405 Conquest, powered by quad Mercury V10 400 Verado outboards.
The Boston Whaler 405 Conquest is the flagship of Whaler’s Conquest lineup, combining serious offshore capability with the comfort, accommodations, and amenities of a luxury cruising yacht. At over 40 feet, the 405 offers an impressive amount of usable space, including a climate-controlled pilothouse, spacious cockpit, well-appointed cabin, full galley, overnight accommodations, and multiple entertaining areas. Whether the goal is offshore fishing, extended cruising, entertaining family and friends, or spending weekends aboard, the 405 Conquest is designed to do it all while delivering the unsinkable construction and quality Boston Whaler is known for.
MA BELLE has just over 63 hours and shows like new. In addition to an extensive factory option list, the current owner has made several significant upgrades that separate this 405 from others on the market, including FLIR night vision, Starlink connectivity, and a Platinum Marine Service Protection Plan covering eligible boat components through 06/24/2033. This provides the next owner with an exceptional level of coverage and peace of mind for years to come.
Notable Options & Equipment
- A total of 1,600 horsepower provides the 405 Conquest with impressive performance while Mercury’s V10 platform delivers smooth, quiet operation and excellent low-speed control.Quad Mercury V10 400 Verado Outboards
- Includes joystick docking, integrated autopilot, and Skyhook digital anchoring, making maneuvering this 40-foot-plus boat remarkably easy around docks, marinas, bridges, and other tight spaces.Mercury Joystick Piloting
- Provides an additional level of control when docking or maneuvering in wind and current.Bow Thruster
- Dramatically reduces boat roll, adding another level of comfort while offshore, drifting, fishing, entertaining, or spending time at anchor.Seakeeper 6 Gyroscopic Stabilizer – Approx. $111,000 Option
- Gives the cabin and interior accommodations a warm, upscale yacht-quality appearance.Premium Rosewood Interior
- A substantial factory upgrade providing convenient chilled storage directly in the cockpit.Chiller Cooler Under Port Aft Seat – Approx. $31,000 Option
- One of the highlights of MA BELLE’s equipment list, featuring:Extensive Simrad Electronics Package – $60,000+ Package
- Twin 19” Simrad multifunction displays at the helm
- Massive 24” Simrad multifunction display for the co-captain
- 48” Simrad HALO Open Array Radar
- Simrad VHF
- Integrated navigation and vessel information
- A valuable owner-added upgrade that provides enhanced visibility and situational awareness when operating at night or in low-light conditions.FLIR Thermal Imaging Camera
- Owner-added satellite connectivity provides high-speed internet capability while cruising and spending extended time aboard.Starlink
- Multiple audio zones throughout the boat provide premium sound whether you’re relaxing in the cabin, entertaining in the pilothouse, or enjoying the cockpit.Full JL Audio Premium Sound System
- Provides substantial onboard power for the boat’s extensive electrical systems, climate control, galley equipment, refrigeration, and other amenities while away from shore power.15kW Diesel Generator
- Features a power-operated aft shade along with a manual forward bow shade, creating comfortable shaded entertaining areas throughout the boat.Bow & Stern Sunshades
- Extensive Refrigeration
- Top-loading freezer in the cabin
- Two refrigerators in the pilothouse
- Additional refrigerator below
- One cooktop is conveniently located in the pilothouse with a second cooktop in the lower galley, giving owners multiple options for meal preparation aboard.Dual Kenyon Cooktops
- Integrated into a cockpit drawer for convenient outdoor grilling and entertaining.Pull-Out Kenyon Cockpit Grill
- Ready for serious offshore fishing and deep-dropping equipment.Electric Reel Outlets
- Provides impressive nighttime ambiance while also improving visibility around the boat after dark.Underwater & Courtesy Lighting Throughout
- Significant long-term protection on eligible components of the vessel, providing added confidence and peace of mind to the next owner.Platinum Marine Service Protection Through 06/24/2033
A Standout 405 Conquest
With only 63+ hours, quad V10 400 Verados, Seakeeper 6, an extensive Simrad electronics package, joystick piloting, bow thruster, FLIR, Starlink, upgraded refrigeration, generator, premium audio, and long-term component protection, MA BELLE represents an exceptional opportunity for someone looking for a highly optioned 405 Conquest without the wait associated with ordering a new boat.
The combination of offshore capability, fishing features, luxury accommodations, technology, and entertaining space makes the Boston Whaler 405 Conquest one of the most versatile boats in its class.
A FULL FACTORY OPTION AND EQUIPMENT LIST IS AVAILABLE BY REQUEST.
MA BELLE is located at MarineMax in St. Petersburg, Florida.
Please reach out with any questions, additional specifications, or to schedule a private showing of MA BELLE.

See this vessel in person or via video
What This Boat Comes With
Information on this listing is provided in good faith by YachtWay and the listing broker/dealer, but accuracy is not guaranteed. All details are subject to change and buyers should independently verify specifications, condition, and availability before purchase.
Range Calculator
By YachtWaySet point A and point B on the map to plan a trip. Estimates use this hull's fuel curve, quad Mercury Verado 400 V10 and a 620 gal fuel tank.
This is an estimate based on available data and is intended for reference purposes only — not a guarantee of real-world performance. Actual range depends on load, sea state, and conditions.
Yacht Financing
By YachtWayFinancing a boat is not like financing a car. Terms run up to 20 years, down payments matter more, and the rate you see depends on the lender panel behind it.
Rates from 6.35% APR, updated with the market. Your rate depends on your credit profile and lender match.
Yacht Insurance
By YachtWayPlanning to buy this 2025 Boston Whaler 405 Conquest?
Get an instant insurance estimate for a Boston Whaler 405 Conquest in St Petersburg, US through MasterCover, backed by A-rated underwriters.

Deck Layout
Age
Built in 2025. Build year and production period shape the asking price through age of systems, styling and the equipment fitted as standard.
Engine
64 hours on quad Mercury Verado 400 V10. Engine hours, service history and configuration are the largest mechanical factors in an asking price.
Options and features
Joystick, Radar, and Onboard WiFi are fitted. Optional equipment, refits and onboard features are usually reflected in the asking price.
Price history
Listed on YachtWay at $1,299,999 on Sep 18, 2026. Reduced to $1,249,999 on Oct 14, 2026. On-platform asking prices only.
Other market factors
Location, tax and duty status, condition, service history and how many comparable hulls are for sale all move the asking price.
2025 Boston Whaler 405 Conquest
$1,249,999
$50K